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An Algorithm for Thermodynamic Parameter Optimization: Application to the Martian mantle Geochemistry, Geophys. Geosystems (IF 3.275) Pub Date : 2021-04-11 D. Khan, C. Liebske, J. A. D. Connolly
The compilation of thermodynamic models for geophysical applications is such a tedious and complex process that it is generally impractical for researchers to refit parameters in existing models in light of new constraints. To mitigate this difficulty, we develop a Bayesian algorithm that permits the modification of a thermodynamic model to account for additional observational constraints. This algorithm
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Seafloor methane seepage in the German North Sea Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Miriam Römer, Martin Blumenberg, Katja Heeschen, Stefan Schloemer, Hendrik Müller, Simon Maximilian Müller, Christian Hilgenfeldt, Udo Barckhausen, Katrin Schwalenberg
This study focusses on seafloor methane seep sites and their distribution in the northwestern part of the German North Sea. Methane seepage is a common phenomenon along marine shelfs and known to occur in the North Sea, but proof of their existence was lacking in the study area. Using a ship-based multibeam echosounder we detected a minimum of 166 flares that are indicative for free gas releases from
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High crystal number densities from mechanical damage Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Amanda Lindoo, Katharine V Cashman
Laboratory experiments investigating syn-eruptive crystallization are fundamental for interpreting crystal and vesicle textures in pyroclasts. Previous experiments have advanced our understanding by varying decompression and cooling pathways, volatile components, and melt composition. However, they have largely failed to produce the high crystal number densities seen in many cryptodome and dome samples
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Geochemical Characteristics of Hydrocarbons in Core Sediments from the Southwest Sub-basin of the South China Sea and Its Implications for the Sedimentary Environment Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Xianqing Wang, Zhifeng Wan, Chongmin Chen, Sheng Chen
Marine sediments are found to record various information for example the evolution of ocean and the exchange of matter and energy between the surrounding continents and oceans. The Southwest Sub-basin is one of the most important tectonic unit in the South China Sea Basin. The geochemical information of the sediments provides potential to understand the sedimentary history of the Southwest Sub-basin
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Test on the reliability of the subsurface fault geometry estimated by deformed river terraces along the Bailang River, north front of the Qilian Shan (NW China) Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Xiaofei Hu, Xianghe Ji, Xilin Cao, Jiuying Chen, Baotian Pan
The subsurface fault geometry is the base to understand the process of crust deformation and mountain building. Based on kinematic models for fault-related folds, the geomorphic method is applied recently to estimate the subsurface fault geometry, while the validation on its reliability is lack. In this study, we surveyed a suit of river terrace surfaces across an active fold at the north front of
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Numerical simulation on the longitudinal breach process of landslide dams using an improved coupled DEM-CFD method Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Dong-yang Li, De-feng Zheng, Hao Wu, Yue-qiang Shen, Ting-kai Nian
An accurate investigation of the landslide dam breach process is crucial for the understanding the breach mechanism and disaster prediction. However, the numerical research on the landslide dam breach process to date is rarely reported, especially regarding the soil-water flow coupling effect incorporated in the erosion process. This paper presents a numerical investigation on the longitudinal breach
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Bayesian inference of ice softness and basal sliding parameters at Langjökull Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Giri Gopalan, Birgir Hrafnkelsson, Guðfinna Aðalgeirsdóttir, Finnur Pálsson
We develop Bayesian statistical models that are designed for the inference of ice softness and basal sliding parameters, important glaciological quantities. These models are applied to Langj\"{o}kull, the second largest temperate ice cap in Iceland at about 900 squared kilometers in area. The models make use of a relationship between physical parameters and ice velocity as stipulated by a shallow ice
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Quantification of lithological heterogeneity within Opalinus Clay: towards a uniform subfacies classification scheme using a novel automated core image recognition tool Front. Earth Sci. (IF 2.689) Pub Date : 2021-04-12 Bruno Lauper, Géraldine Nicole Zimmerli, David Jaeggi, Gaudenz Deplazes, Stephan Wohlwend, Johannes Rempfer, Anneleen Foubert
The Opalinus Clay is notable in Switzerland as being the selected host rock for deep geological disposal of radioactive waste. Since the early 1990’s, this argillaceous mudstone formation of Jurassic age has been intensively studied within the framework of national and international projects to characterize its geological, hydrological, mechanical, thermal, chemical, and biological properties. While
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A One-Class-Classifier-Based Negative Data Generation Method for Rapid Earthquake-Induced Landslide Susceptibility Mapping Front. Earth Sci. (IF 2.689) Pub Date : 2021-02-10 Shuai Chen, Zelang Miao, Lixin Wu, Anshu Zhang, Qirong Li, Yueguang He
Machine learning with extensive labelled training samples (e.g., positive and negative data) has been received much attention to address earthquake-induced landslide susceptibility mapping (LSM). However, massive labelled training data required by machine learning, particularly the precise negative data (i.e., non-landslide area), cannot be easily and efficiently collected. To address this issue, this
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Hydrogeochemistry and isotope compositions of multi-layered aquifer systems in the Recife Metropolitan Region, Pernambuco (NE Brazil): An integrated approach using multivariate statistical analyses J. South Am. Earth Sci. (IF 1.704) Pub Date : 2021-04-06 Thyego R. Silva, Teresa E. Leitão, Mariucha M.C. Lima, Tiago N. Martins, Manuel M. Oliveira, Mateus S.C. Albuquerque, Waldir D. Costa
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The Maravilha Orthogneiss: High-K calc-alkaline Cryogenian evidence of the pre- to early- collisional magmatism in the southern PEAL domain, SE Borborema Province J. South Am. Earth Sci. (IF 1.704) Pub Date : 2021-04-12 Luan Cavalcante Dáttoli, Adejardo Francisco da Silva Filho, Ignez de Pinho Guimarães, Pedro Maciel de Paula Garcia, Ramon Matos Arouca Júnior
The study area is in the southern Pernambuco–Alagoas Domain, Borborema Province Southern sub province, northeastern Brazil. The Maravilha orthogneiss comprise an elongated intrusion of ∼200 km2, with an ESE-WNW major axis, ranging in composition from tonalite to sienogranite, emplaced into metasedimentary rocks of the Inhapi sequence, in the southern part of the Pernambuco - Alagoas Domain. Diorite
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Enhanced E. huxleyi carbonate counterpump as a positive feedback to increase deglacial pCO2sw in the Eastern Equatorial Pacific Quat. Sci. Rev. (IF 3.803) Pub Date : 2021-04-12 Chiara Balestrieri, Patrizia Ziveri, Michaël Grelaud, P. Graham Mortyn, Claudia Agnini
The modern Eastern Equatorial Pacific (EEP) Ocean is a high nutrient low chlorophyll (HNLC) upwelling region and a large oceanic source of carbon to the atmosphere. During the last deglaciation, the EEP played a major role in the outgassing of carbon dioxide into the atmosphere from the upwelling surface water system of CO2-enriched deep-water masses originating from the Southern Ocean. The EEP upwelling
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Pore Characteristics of Gondwana Shale of Eastern India J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Piyush Sarkar, Ranjana Ghosh, Kumar Hemant Singh, Trilok Nath Singh
A complete pore characteristic of the Indian Gondwana shale is studied by combining laboratory experiments and numerical modeling. Mercury injection capillary pressure (MICP), nitrogen gas adsorption (N2GA) and scanning electron microscopy (SEM) are the primary laboratory methods used to evaluate the pore characteristics. The N2GA and MICP were coupled to estimate the pore size distribution (PSD) of
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Assessment of Groundwater Quality for Drinking and Irrigation Purpose using Geospatial and Statistical techniques in a Semi-arid Region of Rajasthan, India J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Jai Kumar, Brototi Biswas, Susan Verghese
The role of groundwater in irrigation and drinking purposes and sustaining growth in economy is well-known. Groundwater is generally less susceptible to contamination and pollution when compared to surface water bodies. This paper is based on extensive investigations on the spatial and seasonal representative measurement of chemical parameters from 80 dug wells of Churu and adjoining Bikaner districts
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The Neogene Siwalik Succession of the Arunachal Himalaya: A Revised Lithostratigrphic Classification and its Implications for the Regional Paleogeography J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Arijit Debnath, Suchana Taral, Subhra Mullick, Tapan Chakraborty
Marine deposits in the Neogene Siwalik succession have been documented from the Tista valley, Bhutan and Kameng river sections of the Eastern Himalaya. This study was designed to investigate possible marine influence further east. During this investigation, it was revealed that the current classification and description of the stratigraphic units were inadequate to describe the variations present in
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Watershed Prioritization Based on Morphometric Parameters and PCA Technique: A Case Study of Deonar River Sub Basin, Sidhi Area, Madhya Pradesh, India J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Rabindra N. Tiwari, Vikash K. Kushwaha
Watershed prioritization is beneficial for soil, groundwater development as well as for the implementation of the artificial recharge schemes. It is a well-known scientific process of drainage network delineation and ranking of different sub-watersheds of a basin. This is the mostly adopted morphometric interpretation and assessment technique and used for prioritization of watershed. In the present
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Kinematic and Statistical Analysis of Fold Related Fractures in the Northeast of Kopet Dagh Folded Belt, Northeast Iran J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Nasrin Kianizadeh, Behnam Rahimi, Gholam Reza Lashkaripour, Vahid Fakoor
This study provides a description and statistical analysis of fold-related fractures in the Khur fold, northeast of Kopet Dagh fold-and-thrust belt, Iran. Kopet Dagh fold-and-thrust belt, as a part of Alpine-Himalaya orogeny belt in west Asia, forms the northeastern boundary of Iran plateau. In this study, the remote sensing technique was utilized to map and statistically analyze the lineaments on
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Impact Assessment of Artificial Recharge Structures on Kakatiya University Campus, Warangal Urban District, Telangana J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 R. Mallikarjuna Reddy, A. G. S. Reddy, T. Naveen
The artificial recharge structures (ARS) project was taken up on Kakatiya University campus, Warangal urban district, Telangana state with the dual purpose of meeting the growing demand for water supply on campus and to demonstrate the benefits of artificial recharge to the students and society at large. Different types of site-specific recharge structures were developed in tune with the local hydrogeological
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Neoarchaean Felsic Volcanic Rocks in Tracing Evolution of Arcs: An Insight from Geochemical Data of the Gadag Schist Belt, Western Dharwar Craton J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 V. S. Hedge, Fernando Corfu, Hartwig E. Frimmel, R. H. Sawkar, M. M. Korkoppa
Quartz porphyry of rhyolitic composition though a volumetrically minor is an important component of metavolcanic successions in the Gadag schist belt in the western Dharwar craton. The quartz porphyries are calc-alkaline, enriched in light rare earth elements (Lan/Ybn ~ 10–20) and with a strong negative Eu anomaly (Eu/Eu*N=0.45–0.58). These features, coupled with high K2O/Na2O (0.8 to 1.46), low Nb/Th
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Field and Simulation Studies for Mechanised Depillaring below Incompetent Geological Formations of an Indian Coal Mine J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Arun Kumar Singh, Ashok Kumar, Dheeraj Kumar, Rajendra Singh, Sahendra Ram, Rakesh Kumar, Amit Kumar Singh
A fully mechanised mining method using continuous miner (CM) for pillar extraction in single-pass is introduced in the year 2010 at Pinoura Mine of South Eastern Coalfields Limited, Bilaspur in India. Overall mining cycle time is reduced by single-pass pillar extraction as it does not require drivage of split galleries in pillars and support installation for such galleries. Further, inherent technical
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Geomorphic Analysis, Morphometric-based Prioritization and Tectonic Implications in Chite Lui River, Northeast India J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Binoy Kumar Barman, Chegondi Udaya Bhaskara Rao, K. Srinivasa Rao, Adesh Patel, Kamlesh Kushwaha, Sudhir Kumar Singh
River morphometry is a useful approach in basin analysis which helps to interprets fluvially originated landforms. The aim of the present work is to evaluate the morphometric and morphotectonic parameters along with prioritization for soil erosion and water availability in Chite Lui watershed. Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) is a useful approach to find out
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A Perspective on Rishiganga-Dhauliganga Flash Flood in the Nanda Devi Biosphere Reserve, Garhwal Himalaya, India J. Geol. Soc. India (IF 0.899) Pub Date : 2021-04-12 Kalachand Sain, Amit Kumar, Manish Mehta, Akshaya Verma, Sameer K. Tiwari, Purushottam K. Garg, Vinit Kumar, Santosh K. Rai, Pradeep Srivastava, Koushik Sen
A ground-based and heliborne survey was conducted immediately after the disaster that took place on 7th February, 2021 in the Chamoli district of Uttarakhand. Based on these observations and freely available Google Earth imagery, we have arrived at plausible causes of this catastrophe as detachment of a sizeable rock mass and overlying hanging glacier in the Raunthi catchment that dammed the Rishiganga
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Assessing the drinking water quality of educational institutions at selected locations of district Swat, Pakistan Environ. Earth Sci. (IF 2.18) Pub Date : 2021-04-12 Muhammad Salam, Fakhri Alam, Md. Nuralam Hossain, Mian Abdal Saeed, Tasir Khan, Kinza Zarin, Bakht Rwan, Waheed Ullah, Waqas Khan, Owais Khan
Water pollution is a primary environmental concern in Pakistan due to its serious health effects. Over more than 1.25 million people in the Swat district rely on surface and groundwater sources for drinking, agricultural purposes. Hence, the need to ascertain the drinking water quality and associated human health risks were considered highly significant. In this study, eighty water samples (40 for
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Analytical solution of two-dimensional conservative solute transport in a heterogeneous porous medium for varying input point source Environ. Earth Sci. (IF 2.18) Pub Date : 2021-04-12 R. R. Yadav, Lav Kush Kumar
In the present study, an analytical solution is obtained for two-dimensional advection–dispersion equation with variable coefficients in a semi-infinite heterogeneous porous medium. Dispersion coefficient and groundwater velocity are assumed to vary temporally as well as spatially while the retardation factor varies spatially only. The first-order decay and zero-order production terms are also considered
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Trace-element behaviour in sediments of Ugandan part of Lake Victoria: results from sequential extraction and chemometrical evaluation Environ. Earth Sci. (IF 2.18) Pub Date : 2021-04-12 Nils Ribbe, Kenneth Arinaitwe, Tallent Dadi, Kurt Friese, Wolf von Tümpling
Lake Victoria is the second largest freshwater lake and the largest tropical lake in the world. The transboundary lake has the fastest growing population in its catchment, which can impact the water and sediment quality. To determine the extent of anthropogenic effects on sediment quality in the Ugandan part of Lake Victoria, the contents and binding behaviour of trace elements were analysed, as well
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Improving the accuracy of soil organic carbon content prediction based on visible and near-infrared spectroscopy and machine learning Environ. Earth Sci. (IF 2.18) Pub Date : 2021-04-12 Mingxing Xu, Xianyao Chu, Yesi Fu, Changjiang Wang, Shaohua Wu
Choosing appropriate multivariate calibration and preprocessing transformation techniques is important in the determination of soil organic carbon (SOC) content based on visible and near-infrared (Vis–NIR) spectroscopy. The performance levels of partial least-squares regression (PLSR), support vector machine regression (SVMR), and wavelet neural network (WNN) calibration methods coupled with different
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Landslide susceptibility mapping using statistical bivariate models and their hybrid with normalized spatial-correlated scale index and weighted calibrated landslide potential model Environ. Earth Sci. (IF 2.18) Pub Date : 2021-04-12 Zhuo Chen, Danqing Song, Mukhiddin Juliev, Hamid Reza Pourghasemi
Considering the slope units as our reference mapping units, three statistical models [frequency ratio (FR), index of entropy (IOE), and evidential belief function (EBF)] are used in combination by two methods [normalized spatial-correlated scale index (NSCI) and weighted calibrated landslide potential model (WCLPM)]. For this aim, ten conditioning factors correlated with landslide namely, altitude
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Quality assessment of harvested rainwater and seasonal variations in the southwest coastal area, Bangladesh Environ. Earth Sci. (IF 2.18) Pub Date : 2021-04-12 Md. Aminur Rahman, Md. Abul Hashem, Md. Hasibur Rahman Sheikh, A. S. M. Fazle Bari
Secure potable water is indispensable to life. The presence of salinity in potable water has become a serious problem worldwide and it is essential to ensure secure potable water, particularly in the coastal areas of Bangladesh. In this work, 48 (forty-eight) harvested rainwater samples were assessed from Upazila (sub-district) of Mongla and Sarankhola, Bagerhat district, Bangladesh during the monsoon
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Identification of the source caldera for the Middle Miocene ash‐flow tuffs in the Kii Peninsula based on apatite trace‐element composition Isl. Arc (IF 1.655) Pub Date : 2021-04-12 Reishi Takashima, Hiroyuki Hoshi, Yutaka Wada, Hironao Shinjoe
A large caldera cluster consisting of at least four calderas (Omine, Odai, Kumano‐North and Kumano calderas) existed in the central–southern part of the Kii Peninsula approximately 14–15 Ma. On the other hand, thick Middle Miocene ash‐flow tuffs, referred to as the Muro Ash‐flow Tuff and the Sekibutsu Tuff Member, are distributed in the northern part of the Kii Peninsula. Although these tuffs are considered
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The impact of natural fractures on heat extraction from tight Triassic sandstones in the West Netherlands Basin: a case study combining well, seismic and numerical data Neth. J. Geosci. (IF 1.891) Pub Date : 2021-04-12 Quinten D. Boersma, Pierre Olivier Bruna, Stephan de Hoop, Francesco Vinci, Ali Moradi Tehrani, Giovanni Bertotti
The positive impact that natural fractures can have on geothermal heat production from low-permeability reservoirs has become increasingly recognised and proven by subsurface case studies. In this study, we assess the potential impact of natural fractures on heat extraction from the tight Lower Buntsandstein Subgroup targeted by the recently drilled NLW-GT-01 well (West Netherlands Basin (WNB)). We
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3D Mineral Prospectivity Mapping Based on Deep Metallogenic Prediction Theory: A Case Study of the Lala Copper Mine, Sichuan, China J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Keyan Xiao, Jie Xiang, Mingjing Fan, Yang Xu
With the decrease in surface and shallow ore deposits, mineral exploration has focused on deeply buried ore bodies, and large-scale metallogenic prediction presents new opportunities and challenges. This paper adopts the predictive thinking method in this era of big data combined with specific research on the special exploration and exploitation of deep-earth resources. Four basic theoretical models
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Detection of Geochemical Element Assemblage Anomalies Using a Local Correlation Approach J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Xianchuan Yu, Shicheng Wang, Hao Wang, Yuchen Liang, Siying Chen, Kang Wu, Zhaoying Yang, Chongyang Li, Yunzhen Chang, Ying Zhan, Wang Yao, Dan Hu
As direct prospecting data, geochemical data play an important role in modelling prospect potential. Geochemical element assemblage anomalies are usually reflected by the correlation between elements. Correlation coefficients are computed from the values of two elements, which reflect only the correlation at a global level. Thus, the spatial details of the correlation structure are ignored. In fact
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Hierarchical MPS-Based Three-Dimensional Geological Structure Reconstruction with Two-Dimensional Image(s) J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Weisheng Hou, Hengguang Liu, Tiancheng Zheng, Wenjie Shen, Fan Xiao
Multiple-point statistics (MPS) is a useful approach to reconstruct three-dimensional models in the macroscopic or microscopic field. Extracting spatial features for three-dimensional reconstruction from two-dimensional training images (TIs), and characterizing non-stationary features with directional ductility are two key issues in MPS simulation. This study presents a step-wise MPS-based three-dimensional
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Aspects of Regional and Worldwide Mineral Resource Prediction J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Frits Agterberg
The purpose of this contribution is to highlight four topics of regional and worldwide mineral resource prediction: (1) use of the jackknife for bias elimination in regional mineral potential assessments; (2) estimating total amounts of metal from mineral potential maps; (3) fractal/multifractal modeling of mineral deposit density data in permissive areas; and (4) worldwide and large-areas metal size-frequency
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Fuzzy Modeling of Surficial Uranium Prospectivity in British Columbia (Canada) with a Weighted Fuzzy Algebraic Sum Operator J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Emmanuel John M. Carranza
This paper demonstrates knowledge-guided fuzzy logic modeling of regional-scale surficial uranium (U) prospectivity in British Columbia (Canada). The deposits/occurrences of surficial U in this region vary from those in Western Australia and Namibia; thus, requiring innovative and carefully-thought techniques of spatial evidence generation and integration. As novelty, this papers introduces a new weighted
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Mineral Prospectivity Prediction via Convolutional Neural Networks Based on Geological Big Data J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Shi Li, Jianping Chen, Chang Liu, Yang Wang
Today’s era of big data is witnessing a gradual increase in the amount of data, more correlations between data, as well as growth in their spatial dimension. Conventional linear statistical models applied to mineral prospectivity mapping (MPM) perform poorly because of the random and nonlinear nature of metallogenic processes. To overcome this performance degradation, deep learning models have been
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Integrated Exploration Model for Concealed Ore Deposit: A Case Study from Shuitou Fluorite Deposit, Inner Mongolia, North China J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Liang Wang, Shouting Zhang, Yi Fang, Li Tang
The demand for fluorite resource is increasing rapidly as most fluorite deposits on Earth’s surface have been exhausted. The newly discovered fluorite deposits in Inner Mongolia are hosted by Permian metamorphosed sandy slate, intermediate-acid intrusive rocks and Cretaceous volcanic sedimentary rocks. The ore bodies are strictly controlled by faults and buried by cover rocks. The feasibility and effectiveness
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Uncertainty Visualisation of a 3D Geological Geometry Model and Its Application in GIS-Based Mineral Resource Assessment: A Case Study in Huayuan District, Northwestern Hunan Province, China J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Nan Li, Cangbai Li, Wenkai Chu, Keyan Xiao, Weihan Tao, Xianglong Song, Rui Cao, Yang Xu, Mingjing Fan
This paper reports an application of uncertainty visualisation of a regional scale (1:50 000) 3D geological geometry model to be involved in GIS-based 3D mineral potential assessment of the Xiangxibei lead-zinc mineral concentration area in northwestern Hunan District, China. Three-dimensional (3D) geological modelling is a process of interpretation that combines a set of input measurements in geometry
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Fractal Calculus and Analysis for Characterizing Geoanomalies Caused by Singular Geological Processes J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Qiuming Cheng
Integral and differentiation are two mathematical operations in modern calculus and analysis which have been commonly applied in many fields of science. Integration and differentiation are associated and linked as inverse operation by the fundamental theorem of calculus. Both integral and differentiation are defined based on the concept of additive Lebesgue measure although various generations have
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Application of BEMD in Extraction of Magnetic Anomaly Components Associated with Sn-W Polymetallic Mineralization in SE Yunnan, SW China J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Chen Chen, Xu Zhu, Yongqing Chen, Shouting Zhang, Pengda Zhao
The tin (Sn)-tungsten (W) polymetallic ore concentrated district in SE Yunnan is distributed at the junction region of the Yangtze Block, the Cathaysian Block and the Indosinian Block, where there are several giant deposits of tin, tungsten, copper, silver, lead, zinc and indium closely associated with a large scale Late Cretaceous magmatism. Bi-dimensional empirical mode decomposition (BEMD) is used
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Identification of the Ore-Forming Anomaly Component by MSVD Combined with PCA from Element Concentrations in Fracture Zones of the Laochang Ore Field, Gejiu, SW China J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Jiangnan Zhao, Shouyu Chen
Fault and fractures are well-developed in the Gejiu tin-polymetallic district, and they are closely related to the formation and distribution of ores. In this paper, the principal component analysis (PCA) and multifractal singular value decomposition (MSVD) methodologies were applied for identification of the ore-forming anomaly components from element concentrations of fault rocks in the Laochang
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Study on the PTX Parameters and Fractal Characteristics of Ore-Forming Fluids in the East Ore Section of the Pulang Copper Deposit, Southwest China J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Qinglin Xia, Tongfei Li, Li Kang, Shuai Leng, Xiaochen Wang
In this paper, the east ore section of the Pulang porphyry copper deposit is selected as the research object. The micro-thermometer and laser Raman spectroscopic technique are utilized to study the parameters of ore-forming fluids such as pressure, temperature, and compositions. In the meantime, the fractal models, including the perimeter-area (P-A) model and number-size (N-S) model, are introduced
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Detection of Multivariate Geochemical Anomalies Using the Bat-Optimized Isolation Forest and Bat-Optimized Elliptic Envelope Models J. Earth Sci. (IF 2.209) Pub Date : 2021-04-12 Yongliang Chen, Shicheng Wang, Qingying Zhao, Guosheng Sun
Isolation forest and elliptic envelope are used to detect geochemical anomalies, and the bat algorithm was adopted to optimize the parameters of the two models. The two bat-optimized models and their default-parameter counterparts were used to detect multivariate geochemical anomalies from the stream sediment survey data of 1:50 000 scale collected from the Helong district, Jilin Province, China. Based
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The Utilisation of Sentinel-2A images and Google Earth Engine for Monitoring Tropical Savannah Grassland Geocarto Int. (IF 3.789) Pub Date : 2021-04-12 Muhammad Reza Pahlefi, Projo Danoedoro, Muhammad Kamal
Abstract A fast, precise and efficient method of savannah grassland mapping and monitoring is essential to support sustainable livestock feed management. This study aims to utilise Sentinel-2A Level-1C imagery to map and monitor tropical savannah grasslands on Sabu Island, Indonesia. Normalized Difference Vegetation Index (NDVI) images were generated to identify vegetation objects from 50 image scenes
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Landslide Susceptibility Mapping using state-of-the-art machine learning ensembles Geocarto Int. (IF 3.789) Pub Date : 2021-04-12 Binh Thai Pham, Vinh Duy Vu, Romulus Costache, Tran Van Phong, Trinh Quoc Ngo, Trung-Hieu Tran, Huu Duy Nguyen, Mahdis Amiri, Mai Thanh Tan, Phan Trong Trinh, Hiep Van Le, Indra Prakash
Abstract This study propose a new approach through which the landslide susceptibility in Quang Nam (Vietnam) will be estimated using the best model among the following algorithms: Decision Table (DT), Naïve Bayes (NB), Decision Table - Naïve Bayes (DTNB), Bagging Ensemble, Cascade Generalization Ensemble, Dagging Ensemble, Decorate Ensemble, MultiBoost Ensemble, MultiScheme Ensemble, Real Ada Boost
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Evaluation of different machine learning algorithms for pearl millet discrimination using multi-sensor SAR data Geocarto Int. (IF 3.789) Pub Date : 2021-04-12 Arun Balaji Ramathilagam, Dipanwita Haldar
Abstract This study aims to assess the potential of multi-temporal Sentinel-1 and RADARSAT-2 data for pearl millet discrimination using various classifiers – machine learning and knowledge-based decision tree (m-DT and k-DT), Support Vector Machine (SVM), and Random Forest (RF). Results show that the RF classifier outperformed the other classifiers in terms of overall accuracy (OA) and kappa coefficient
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Global dominance of tectonics over climate in shaping river longitudinal profiles Nat. Geosci. (IF 13.566) Pub Date : 2021-04-12 Hansjörg Seybold, Wouter R. Berghuijs, Jeff P. Prancevic, James W. Kirchner
River networks are striking features engraved into the surface of the Earth, shaped by uplift and erosion under the joint influence of climate and tectonics. How a river’s gradient changes as it descends along its course—its longitudinal profile concavity—varies greatly from one basin to the next, reflecting the interplay between uplift and erosional processes. A recent global analysis has suggested
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Mitochondrial dysfunction and potential mitochondrial protectant treatments in tendinopathy Ann. N. Y. Acad. Sci. (IF 4.728) Pub Date : 2021-04-11 Xueying Zhang, Claire D. Eliasberg, Scott A. Rodeo
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Author Correction: High-depth African genomes inform human migration and health Nature (IF 42.778) Pub Date : 2021-04-12 Ananyo Choudhury, Shaun Aron, Laura R. Botigué, Dhriti Sengupta, Gerrit Botha, Taoufik Bensellak, Gordon Wells, Judit Kumuthini, Daniel Shriner, Yasmina J. Fakim, Anisah W. Ghoorah, Eileen Dareng, Trust Odia, Oluwadamilare Falola, Ezekiel Adebiyi, Scott Hazelhurst, Gaston Mazandu, Oscar A. Nyangiri, Mamana Mbiyavanga, Alia Benkahla, Samar K. Kassim, Nicola Mulder, Sally N. Adebamowo, Emile R. Chimusa
A Correction to this paper has been published: https://doi.org/10.1038/s41586-021-03286-9.
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Multilevel proteomics reveals host perturbations by SARS-CoV-2 and SARS-CoV Nature (IF 42.778) Pub Date : 2021-04-12 Alexey Stukalov, Virginie Girault, Vincent Grass, Ozge Karayel, Valter Bergant, Christian Urban, Darya A. Haas, Yiqi Huang, Lila Oubraham, Anqi Wang, M. Sabri Hamad, Antonio Piras, Fynn M. Hansen, Maria C. Tanzer, Igor Paron, Luca Zinzula, Thomas Enghleitner, Maria Reinecke, Teresa M. Lavacca, Rosina Ehmann, Roman Wölfel, Jörg Jores, Bernhard Kuster, Ulrike Protzer, Roland Rad, John Ziebuhr, Volker
The global emergence of SARS-CoV-2 urgently requires an in-depth understanding of molecular functions of viral proteins and their interactions with the host proteome. Several individual omics studies have extended our knowledge of COVID-19 pathophysiology1–10. Integration of such datasets to obtain a holistic view of virus-host interactions and to define the pathogenic properties of SARS-CoV-2 is limited
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A ‘no-brainer’ decision to become a COVID-19 vaccine-centre volunteer Nature (IF 42.778) Pub Date : 2021-04-12 David Payne
Hannah Franklin is one of 300 staff members at the Francis Crick Institute in London, helping to bring the pandemic to an end.
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Social and political justice hit by UK aid cuts Nature (IF 42.778) Pub Date : 2021-04-12 Rana Dajani, Heather D. Flowe, Ben Warwick
Letter to the Editor
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Thousands protest against funding cuts to SDG work Nature (IF 42.778) Pub Date : 2021-04-12 Jenni Barclay, Kent Buse, Claire J. Horwell, Sarah Hawkes
Letter to the Editor
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Quantum computing’s reproducibility crisis: Majorana fermions Nature (IF 42.778) Pub Date : 2021-04-12 Sergey Frolov
The controversy over Majorana particles is eroding confidence in the field. More accountability and openness are needed — from authors, reviewers and journal editors.
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Daily briefing: Vaccine passports could worsen inequality Nature (IF 42.778) Pub Date : 2021-04-12 Emma Stoye
Restrictive travel policies could further privilege global-health professionals from high-income countries. Plus: Joe Biden’s plans to increase science funding, and why our brains favour adding over subtraction.
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Toilets – what will it take to fix them? Nature (IF 42.778) Pub Date : 2021-04-12 Josie Glausiusz
The global dearth of safe sewage systems needs innovation and advocacy.
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Daily briefing: a graphical guide to vaccine benefits and risks. Nature (IF 42.778) Pub Date : 2021-04-09 Flora Graham
Researchers are starting to delve into possible rare side effects of COVID-19 vaccines. Plus: the month’s best science images, and everything you need to know about Plan S.
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Impact analysis of different axis layouts of detached breakwater on flow and sediment transport Arab. J. Geosci. (IF 1.327) Pub Date : 2021-04-12 Haitao Yu, Feng Luo, Ruijie Li, Yanran Liu, Xuwen Fang, Yuting Li
An incorporation and application of a two-dimensional, unstructured grid hydrodynamic model with a suspended sediment transport module is presented in the study. The model has a satisfactory verification with available measured data. After the verification, the variation of tidal current field and the seabed evolution are simulated. Based on the simulation results, the paper compares and analyzes the
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A Multi-Stakeholder Involved Effective E-Waste Management in Manufacturing Recycled Electronic Products Using Game Theory Arab. J. Sci. Eng. (IF 1.711) Pub Date : 2021-04-12 Sudhakar Sengan, Kanmani Palaniappan, Nirmala Devi Kathamuthu, Rashid Amin, Rajesh Babu Mariappan, Nik Alif Amri Nik Hashim, Eni Noreni Mohamad Zain, Pankaj Dadheech
Globally, electronic waste (E-Waste) has grown as a severe concern owing to the increasing quantity of waste and the toxic it. E-Waste includes plastics and metals, which are highly recyclable but which, if not adequately managed, are concerned about the health and the environment by plastic waste and heavy metal traces of additives and chemicals. This article investigates the modeling of game theory
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Effect of Treatment Conditions on Matrix Stimulation of Carbonate Rocks with Chelating Agents Arab. J. Sci. Eng. (IF 1.711) Pub Date : 2021-04-12 Assad A. Barri, Amjed M. Hassan, Murtada Saleh Aljawad, Mohamed Mahmoud
This study aimed to optimize the acidizing efficiency during stimulation treatments with chelating agents. The performance of hydroxylethylethylenediaminetriacetic acid (HEDTA), diethylenetriaminepentaacetic acid (DTPA), and ethylenediaminetetraacetic acid (EDTA) in stimulating carbonate rocks were investigated. In this paper, the effect of injection rate, chemical type, pH, and concentration on the
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