-
Petrology and geochemistry of the Az Zabirah south zone bauxite deposit at Al Ba’itha mine, north-central Saudi Arabia Geosci. J. (IF 1.2) Pub Date : 2024-03-14 Mahmoud A. Galmed, Hisham A. Gahlan, Habes A. Ghrefat, Essam A. Mohamed, Khaled M. Al Kahtany
In the central north of Saudi Arabia, outcrop samples from the Cretaceous bauxite profile deposits in the Az Zabirah area were subjected to a comprehensive evaluation aimed at investigating their petrographical and geochemical characteristics using X-ray diffraction analysis (XRD), Scanning electron microscope (SEM) coupled with Energy dispersive (EDS) analysis, and X-ray fluorescence spectrometer
-
A new lithostratigraphic scheme of the Ordovician Jeongseon Formation of the Yongtan Group in the Taebaeksan Basin and sequence stratigraphic analysis with discussion on basin geometry Geosci. J. (IF 1.2) Pub Date : 2024-03-12
Abstract Lithostratigraphy of the Yongtan Group is newly established based on detailed sedimentologic and stratigraphic studies on recently exposed, less deformed, relatively continuous outcrops and comprehensive review of previous studies, mainly focusing on the Jeongseon Formation which occupies most of the group spatially and stratigraphically. The Yongtan Group is divided into the Jeongseon, Haengmae
-
The Hakcheon-Chogok Megaturbidite in the Miocene Pohang-Youngduk Basin, SE Korea: high-gradient slope failure probably triggered by a giant tsunami wave Geosci. J. (IF 1.2) Pub Date : 2024-03-12 Junghee Son, Soonmi Cho, In Gul Hwang
In ancient records, discrimination of specific triggering events from sediment gravity flow deposits is very difficult, due to multiple interactions between triggering events and similar sedimentary characteristics. For this study, we introduce the Hakcheon-Chogok Megaturbidite (HCM) in the Miocene Pohang-Youngduk Basin (PYB), providing an opportunity to differentiate the triggering events. This megaturbidite
-
New insights on seismic activity in the southeastern Korean Peninsula from the Gyeongju Hi-density Broadband Seismic Network (GHBSN) Geosci. J. (IF 1.2) Pub Date : 2024-03-07 Dabeen Heo, Tae-Seob Kang, Minook Kim, Byeong Seok Ahn, Hobin Lim, Jaeseoung Han, Kwang-Hee Kim, Junkee Rhie, YoungHee Kim, Jin-Han Ree
The 2016 magnitude (MW) 5.5 Gyeongju earthquake, which occurred in Korea near assumed epicenters of several substantial historical earthquakes and Quaternary fault segments, underscores the importance of seismic hazard assessment in the region. However, uncertainties about potential seismic sources make evaluating the potential for a moderate-to-large earthquake challenging. Microearthquake monitoring
-
Geospatial technologies for estimating post-wildfire severity through satellite imagery and vegetation types: a case study of the Gangneung Wildfire, South Korea Geosci. J. (IF 1.2) Pub Date : 2024-02-29 Liadira K. Widya, Chang-Wook Lee
Wildfires have caused natural environmental damage that has contributed to deforestation, consequently demonstrating a significant influence on atmospheric emissions. Wildfires occur frequently in South Korea, especially during the spring season. This study assessed post-wildfires areas in Gangneung, South Korea, on April 11, 2023, which were generated by implementing remote sensing technology and
-
Tracing the source of iron bloom slags and iron ores excavated from archaeological sites in Chungju area, South Korea Geosci. J. (IF 1.2) Pub Date : 2024-02-23 Jaeguk Jo, Seojin Kim, Dongbok Shin, Heonkyung Im, Jinah Lim
Iron ores and iron bloom slags from two iron archaeological sites (Chilgeumdong: 300–600 AD, Wanori: ∼20th century) as well as iron ores from six iron deposits in Chungju, South Korea, were examined to assess the provenance of the raw iron ores. Different ore mineralogy proves to be a useful tool in interpreting the ore provenance of samples from the iron archaeological sites, although limited by the
-
Skarn alteration and Fe-Zn-Pb mineralization at the Wondong deposit in the Taebaeksan Basin, South Korea Geosci. J. (IF 1.2) Pub Date : 2024-02-23
Abstract Skarn and Fe-Zn-Pb mineralization at the Wondong deposit located in the Taebaeksan Basin of the central-eastern region of Korean Peninsula occurs along the contact between the Upper Cretaceous quartz-feldspar porphyry (QFP) and carbonate rocks of the Ordovician Makgol Formation. The QFP is relatively fresh and has a sharp contact with the garnet skarn. Skarn is dominant in the carbonate rocks
-
Interaction between surface waters and the Quaternary shallow alluvial aquifer of Lake Maga downstream: influence of ponds, streams, irrigation canals, and geological features (Far North, Cameroon) Geosci. J. (IF 1.2) Pub Date : 2024-02-22
Abstract The valorization of Lake Maga for agricultural purposes has not only contributed to the socio-economic development of the study area, but has also modified the surface water (SW) and groundwater (GW) flow regimes. Understanding the interaction between the SW and the shallow Quaternary aquifer, under land use change and soil structure modification, is still a challenge, especially in the semi-arid
-
Study on the shallow gas distribution in Yeongil Bay using seismic attribute analysis Geosci. J. (IF 1.2) Pub Date : 2024-02-22 Jongpil Won, Jungkyun Shin, Jiho Ha, Hyunggu Jun
Seismic attribute analysis, a method of highlighting important information in seismic data, has been used in various fields. Recently, several studies have used seismic attributes to interpret seismic anomalies associated with subsurface gas. In this study, we applied seismic attribute analysis to seismic data acquired in Yeongil Bay to identify the subsurface gas distribution. Before applying seismic
-
Stratigraphic classification of the Quaternary North Hebei Plain using geophysical methods Geosci. J. (IF 1.2) Pub Date : 2024-02-16 Peng Dai, Kongyou Wu, Shengdong Wang, Sicong Zheng, Tianshe Cheng, Xiaohong Deng
The North Hebei Plain is a typical example of a deep-covered area, with a thickness of more than 200 m Quaternary loose sediments. Previous studies have tried various stratigraphic classification methods but lack an effective combination of geophysical methods. Based on the analysis of rock strata and dating tests, combined with geophysical well-logging data, shallow seismic reflection, and paleomagnetic
-
Holocene paleoenvironmental change based on diatom records from the continental shelf of the Chukchi Sea in the Arctic Ocean Geosci. J. (IF 1.2) Pub Date : 2024-02-16 Young-Suk Bak, Seung-Il Nam
Diatom assemblages from ARA2B-1A taken in the Chukchi Sea shelf were analyzed to reconstruct paleoenvironmental changes during the last 10 ka BP. The main factors controlling the distribution of diatom in the Chukchi Sea are the relatively warm and nutrient-rich Pacific water inflow after the opening of the Bering Strait. Based on the selected diatoms, three diatom assemblage zones are identified.
-
Geochemistry and depositional environment of the Neoproterozoic Ereen and Dartsagt banded iron formation (BIF) deposits in the Idermeg terrane, eastern Mongolia Geosci. J. (IF 1.2) Pub Date : 2024-02-16 Batchuluun Iderbayar, Sodnom Oyungerel, Yeongmin Kim
This study aims to determine the depositional setting and deposit type of the Ereen deposit in the Bayanjargalan soum of Dundgovi province and the Dartsagt deposit in the Dalanjargalan soum of Dornogovi province, Mongolia. Both deposits are hosted within the sediments of the Neoproterozoic Oortsog Formation. The ore-hosted Oortsog Formation consists of shale with muscovite-sericite-magnetite-quartz
-
Regional tectono-sedimentary evolution in the northeastern Beijing Sub-plain: evidence from the Yx02 core chronostratigraphy in the buried Daxing Uplift Geosci. J. (IF 1.2) Pub Date : 2024-02-08 Fubing He, Xiwei Xu, Fang Tian, Zhenhua Liu, Yueze Zhang, Lingyan Bai, Yubin Cui, Kai Wang, Wenzhi Niu, Jingbo Ni, Xiaoyong Liu, Mengmeng Cao
The buried Daxing Uplift connects the Beijing Sag and Dachang Sag, which is the critical tectonic unit for understanding the structural evolution of the Beijing Sub-plain and its linkages to regional tectonics. This study combines paleomagnetic, 26Al-10Be isochron dates and sedimentary analyses from a new borehole (Yx02) in the northeastern Beijing Sub-plain to shed fresh light on regional tectonic
-
Ore-forming fluid characteristics and deposit genesis of the Songjianghe gold deposit in Dunhua, Jilin Province Geosci. J. (IF 1.2) Pub Date : 2024-01-25 Yufan Shi, Bile Li, Zhihua Li, Yaming Sun
The Songjianghe gold deposit is located in the southeastern part of the Jiapigou–Haigou metallogenic belt, north of the North China Craton. The distribution of the ore body is governed by ductile shear zones and fractures oriented in the SN direction. The gold ore body consists of lenticular gold-bearing quartz veins. Mineralization can be divided into five stages: the quartz-oxidation stage (I), the
-
The Nkonko Ni-Cr bearing regolith in DRC: a study of petrography and geochemistry to understand serpentinization and weathering processes of mantle rock Geosci. J. (IF 1.2) Pub Date : 2024-01-18 Douxdoux Kumakele Makutu, Jung Hun Seo
Regolith-hosted Ni-Cr prospects in the Nkonko serpentinized massif are located near Kananga city in the Democratic Republic of Congo (DRC). This serpentinized massif displays an underground regolith profile divided into three main layers: (1) unweathered serpentinite bedrock, (2) saprolite serpentinites, and (3) the pedozone top layer. The bedrock serpentinites consist of serpentine (including lizardite
-
Lower Permian limestone associated with ocean floor rocks in the Inthanon Zone of northern Thailand: new evidence for mélange Geosci. J. (IF 1.2) Pub Date : 2024-01-16 Kritsada Moonpa, Weerapan Srichan, Thasinee Charoentitirat, Thanpimol Intawong
Scattered outcrops of various lithologies such as limestone, chert, sandstone, mudstone or shale, and microgabbro have been recently exposed in the Hariphunchai Education Center of Chiang Mai University (HECCMU), the northern Lamphun area of the northern Thailand. The outcrops are located in the Inthanon Zone where Palaeo-Tethyan ocean plate stratigraphy is well known. Field and microfacies analysis
-
Source investigation of Ikanje artesian spring in north-central Nigeria, using VLF-EM and VES geophysical techniques Geosci. J. (IF 1.2) Pub Date : 2024-01-04
Abstract The study is aimed to examine the subsurface fracture system surrounding the Ikanje Artesian spring as regards the water-bearing zones to determine the source of the spring. The area is in a part of the basement complex of southwestern Nigeria. Using the ABEM WADI Very Low Frequency-Electromagnetic (VLF-EM) equipment, 40 profiles were established, 10 on each geographical coordinate at a 5
-
High-resolution imaging coupled with deep learning model for classifying water body of Soyang Lake, South Korea Geosci. J. (IF 1.2) Pub Date : 2023-11-10 Suci Ramayanti, Sungjae Park, Chang-Wook Lee, Yu-Chul Park
Precise monitoring of natural phenomena is essential to reduce potential risk when a disaster occurs. The capability of developing high-resolution satellite images has provided advantages in the Earth’s surface observation. High-resolution images, including KOMPSAT-2/3 and PlanetScope images, have enabled more precise observation of the Earth’s surface. Combining the high-resolution KOMPSAT-2/3 and
-
Exploring class imbalance with under-sampling, over-sampling, and hybrid sampling based on Mahalanobis distance for landslide susceptibility assessment: a case study of the 2018 Iburi earthquake induced landslides in Hokkaido, Japan Geosci. J. (IF 1.2) Pub Date : 2023-11-07 Kounghoon Nam, Jongtae Kim, Byung-Gon Chae
This study focuses on evaluating the performance of the resampling approach using under-sampling, over-sampling, and hybrid sampling techniques in the random forest (RF) model for landslide susceptibility assessment (LSA). For this research, the study area selected was Hokkaido, Japan, which experienced a total of 5,625 landslides as a single event caused by the 2018 Ibury earthquake. The objective
-
Interpretation of geometrical characteristics of joints using drill core Geosci. J. (IF 1.2) Pub Date : 2023-11-07 Youjin Jeong, Junghae Choi, Byung-Gon Chae
Understanding joints is becoming increasingly important in South Korea owing to the development of plans for high-level waste disposal. This study examined drill cores to assess the morphology of joints in five areas with different rock types. The depths and dip angles of 14,169 joints were measured, and the joints were then classified based on their dip angles. Joint spacings within each set were
-
Biosorption of Cd by an indigenous Cd-resistant bacterium isolated from soil contaminated with Cd Geosci. J. (IF 1.2) Pub Date : 2023-09-18 Thi M. Tran, Jong-Un Lee
An indigenous Cd-resistant bacterium, G17-2, was isolated from Cd-contaminated soil and characterized for its potential application to Cd biosorption. Phylogenetic analysis using 16S rRNA sequences revealed that G17-2 was affiliated to Pseudescherichia vulneris. When grown in yeast extract-peptone-dextrose medium, G17-2 showed the optimal growth at 30 °C and pH 7. Efficiency of Cd biosorption was investigated
-
Hydrogeochemical signatures origin of a karst geothermal reservoir–the Sinian Dengying Formation in northern Guizhou, China Geosci. J. (IF 1.2) Pub Date : 2023-09-16 Pu Liu, Zhengshan Chen, Ganlu Wang, Tie Mao, Chao Li, Yanan Zhou, Hong Xie, Tong Xiang
The karst geothermal reservoir, Sinian Dengying Formation was investigated from the hydrogeochemical perspective. Integrated techniques including XRD + SEM, isotopes, saturation index and PHREEQC modeling were applied. With 37.3–72 ?, the targeted waters indicate low-mediate temperature geothermal reservoir. The CO2 concentration in the geothermal waters varies from 1.2 mg/L to 52.42 mg/L, and the
-
Reappraisal of the Neoproterozoic to middle Paleozoic fossils of North Korea and its tectonic implication Geosci. J. (IF 1.2) Pub Date : 2023-09-15 Yeongju Oh, Jikhan Jung, Mirinae Lee, Juwan Jeon, Seung-Bae Lee, Tae-Yoon S. Park
The tectonic affinity of the Korean Peninsula in reference to the Permo-Triassic collision of the Sino-Korean Craton (SKC) and the South China Craton (SCC) has been in the center of debates over the last three decades. Since the Imjingang Belt that runs through the middle part of the Korean Peninsula is thought to represent the major tectonic boundary, most part of North Korea, including the “Pyeongnam
-
Interpretation of deformation microstructures in syntectonic granite: insights from Phulad granite, Rajasthan, NW India Geosci. J. (IF 1.2) Pub Date : 2023-09-06 Ayan Kumar Sarkar, Anirban Manna, Sadhana M. Chatterjee, Alip Roy
Previous work reveals a syn-tectonic granite named Phulad granite, which is emplaced (∼820 Ma) in the western part of the South Delhi Fold Belt (SDFB) along and across the Phulad Shear Zone (PSZ). There is a lack of information about the detailed microstructural study, differential stress and strain rate variation from this granite body. These pieces of information are crucial in developing deformational
-
Geochemistry and geochronology of Middle Eocene subduction-related felsic volcanics in the Misis-Andirin Complex of the Southeast Anatolian Orogenic Belt Geosci. J. (IF 1.2) Pub Date : 2023-08-30 Nusret Nurlu, Ahmet Can Akinci, Milan Kohút
LA-ICP-MS zircon geochronology and geochemistry (whole-rock & mineral chemistry) from the Misis-Andirin Complex (MAC) volcanic rocks are reported. The MAC records magmatic, sedimentary, and tectonic processes operating at the northern active margin of the Neotethys (South Tethys) in the eastern Mediterranean district. The MAC represents an association of an originally active continental margin including
-
A comparison of the results of 2D anisotropic DC resistivity inversion with 1D joint DC resistivity and CSRMT inversion Geosci. J. (IF 1.2) Pub Date : 2023-08-30 Akarsh Singh, Rajat Jain, Sudha Agrahari, Arseny Shlykov, Alexander Saraev, Abhishek Yadav
In the Eastern Ghats Mobile Belt of Odisha, India, the interpretation of sub-surface resistivity using the direct current (DC) resistivity method can be enhanced by considering the inherent anisotropy of the Precambrian gneissic basement. To investigate this, two-dimensional resistivity and far-field controlled-source radiomagnetotelluric (CSRMT) data were collected in the area. A newly developed 2D
-
Assessment of the relative tectonic activity of the Longxian–Baoji Fault Zone in the northeastern Tibetan Plateau based on geomorphic indices Geosci. J. (IF 1.2) Pub Date : 2023-08-24 Qi Huang, Xiaohu Zhou, Jiyuan You, Shuaishuai Xu, Lushan Liu, Yang Wang
Since the Late Cenozoic, tectonic deformation has been intense in the Longxian–Baoji Fault Zone (LBFZ), which is at the intersection of the southwest margin of the Ordos Block, the northeast margin of the Tibet Plateau, and the Qinling Orogenic Belt. To evaluate the relative tectonic activity within the LBFZ and discuss the influence of the northeastward expansion of the Tibetan Plateau on the geomorphological
-
Strength, deformation and failure behavior of bolted rock-like specimen with multiple cracks under uniaxial compression by particle flow simulation Geosci. J. (IF 1.2) Pub Date : 2023-08-24 Wendong Yang, Yiwei Li, Ling Wang, Kaicheng Zhang, Zhicheng Gong
Most of the rock mass in nature contains a large number of joints, faults and other defects, which make the rock mass have the characteristics of discontinuity and anisotropy, and easily lead to instability and failure of rock engineering. A great quantity of engineering practices show that the bolt has a significant supporting effect on jointed rock mass. Therefore, it is of great significance to
-
Kinematic analysis and fault-dependence of building-wall fracture patterns during moderate earthquakes Geosci. J. (IF 1.2) Pub Date : 2023-08-24 Young-Seog Kim, Sambit Prasanajit Naik, Jin-Hyuck Choi, Kwangmin Jin, Gong-Ruei Ho, Taehyung Kim, Jinhyun Lee
Two recent moderate earthquakes in South Korea, the 2016 MW 5.5 Gyeongju earthquake and 2017 MW 5.4 Pohang earthquake, caused damages to modern residential buildings. These events occurred with almost the same magnitude and duration in the same seismotectonic environment but exhibited remarkably different focal depths, faulting types, surface deformation, and especially structural damage features,
-
The occurrence mechanism and influencing factors of fault-slip rockburst Geosci. J. (IF 1.2) Pub Date : 2023-08-18 Kangyu Wang, Guangjian Liu, Zonglong Mu, Zhicheng Wang, Hao Zhou
No method can simulate the stress wave generated by fault slip in the previous numerical simulation of fault-slip rock-burst. As a result, the radiation characteristics cannot be simulated realistically, which causes the unclear mechanism of fault-slip rock-burst. Therefore, the mechanical-parameter steepest descent method and static-dynamic analysis method were proposed. Taking the 7301 working faces
-
Spreading rate, opening time, and kinematic history of the Ayu Trough Geosci. J. (IF 1.2) Pub Date : 2023-08-08 Hakkyum Choi, Seung-Sep Kim, Sung-Hyun Park, Sang-Mook Lee
The Ayu Trough, located in the equatorial western Pacific, is the only divergent boundary surrounding the Philippine Sea Plate. A mid-ocean ridge spreading in the N-S direction near low-latitude regions presents low geomagnetic anomalies, thereby complicating the constraining of the trough’s spreading rate based on the geomagnetic signal from the magnetized seafloor. According to previous studies,
-
Experimental study on unloading failure characteristics and damage evolution rules of deep diorite based on triaxial acoustic emission tests Geosci. J. (IF 1.2) Pub Date : 2023-08-08 Yang Li, Jianxin Fu, Nai Hao, Weidong Song, Ling Yu
With the increasing depletion of shallow-earth mineral resources, deep mining will become the primary route of future mineral resources development. However, deep mining technology is a long way from being mature, and there are still a great number of issues that severely limit the growth of resources. In this paper, the acoustic emission (AE) tests of triaxially loaded and unloaded deep diorite are
-
Overbank sedimentation and its influence on channel avulsion: examples of the Cretaceous Tando and Namyang basins in the mid-western part of the Korean Peninsula Geosci. J. (IF 1.2) Pub Date : 2023-07-25 Kyungjin Lee, Yong Sik Gihm
The channel arrangements on alluvial plains control the sediment dispersal patterns and stratigraphic architectures, and understanding of alluvial ridge growth and resultant channel avulsion is therefore important to reconstruct the stratigraphic evolution of alluvial sedimentation as well as to assess the quality of non-marine reservoirs. We analyzed the alluvial successions in the Cretaceous Tando
-
Effect of gradation on shear characteristics of granular materials under one-way repeated direct shear and simple shear loadings Geosci. J. (IF 1.2) Pub Date : 2023-07-11 Sung-Sik Park, Tan-No Nguyen, Hong Duk Moon, Sueng-Won Jeong
The shear strength and stiffness of granular materials are crucial parameters for evaluating both stability and sustainability in geoenvironmental engineering. Two types of shear loading, static and cyclic, may directly influence the mechanical properties of granular materials; however, the investigation of stiffness improvement of granular materials has not yet been sufficiently investigated using
-
Archaeogeophysical investigation using magnetic and GPR surveys at Tal-Baltus, Menofia Governorate, Egypt Geosci. J. (IF 1.2) Pub Date : 2023-06-23 Ahmed Khalil, Khamis Mansour, Ahmed El Kotb, Hesham Zahra, Tareq Fahmy Abdallatif, Mohamed Salem, Marwa Shaheen
An integrated geophysical survey using land magnetic and ground penetrating radar (GPR) methods was conducted to investigate the archaeological findings and ancient cultural relics at an undiscovered 100 m × 60 m in Tal-Baltus in El-Sadat city, Menofia Governorate, Egypt. The study area at Tal-Baltus was chosen among several archaeological hills in the Menofia governorate due to its archaeological
-
Two-dimensional interpretation of audio-magnetotelluric data around the epicenter distribution of the 2016 Gyeongju earthquake (ML 5.8), Korea Geosci. J. (IF 1.2) Pub Date : 2023-06-24 Kiyeon Kim, Seokhoon Oh, Hyoung-Seok Kwon, Seong Kon Lee, Hojoon Chung
On September 12, 2016, an ML 5.8 earthquake occurred near Gyeongju City in the southeastern part of the Korean peninsula. Two representative major faults, the Yangsan Fault (YSF) and Ulsan Fault (USF), are close to the earthquake hypocenter. However, the actual location of the hypocenter was reported to be outside of these fault zones. To identify an earthquake-generating fault and analyze its precise
-
Mineral magnetic properties of ultisol profiles from tropical southern India Geosci. J. (IF 1.2) Pub Date : 2023-06-24 Mohan Reethu, Kizhur Sandeep, Joju G. Sebastian, Anish K. Warrier, Geetha H. Aravind, Abdul K. Rafaz, Jithin Jose, Radhakrishnan Akshay, Vadakkath V. Suhaiba
The magnetic grain size, mineralogy and concentration of five ultisol sequences (lateritic soil profiles) developed on different parent rocks (syenite, dolerite, charnockite, gneiss and sandstone) in southwestern India were investigated to gain a better understanding of the pedogenic processes under tropical climate. Field investigations reveal the presence of various horizons in the lateritic profiles
-
Provenance and tectonic setting of the Yimianpo Group in the southeastern Songnen–Zhangguangcai Range Block: constraints on the closure of the Mudanjiang Ocean Geosci. J. (IF 1.2) Pub Date : 2023-05-25 Mishan Zhong, Jin Liu, Zhenghong Liu, Jundian Chen, Hongchao Yu, Haipeng Wang, Junshi Lu, Zijie Wu, Mingchen Pan, Qi Wang, Yilong Wang
The timing of the collision between the Songnen–Zhangguangcai Range Block (SNZRB) and the Jiamusi Block (JMSB) is poorly constrained; however, detrital zircons may provide crucial information on the history of this collision. This study focuses on the Yangmugang and Tumenling formations of the Yimianpo Group in the southeastern SNZRB, which were previously thought to have been deposited during the
-
Numerical simulation of urban road collapse induced by the damaged sewer pipe and repetitive heavy rainfalls Geosci. J. (IF 1.2) Pub Date : 2023-05-20 Byeongju Jung, Dong-Woo Ryu, Byoung Woo Yum
An urban road collapse has become one of the significant geohazards frequently occurring in metropolitan cities worldwide. In most cases, these devastating superficial collapses are known to be induced by small underground cavities. They are created by the failure of subsurface structures and pipelines (e.g., water supply/sewer lines, subway tunnels). However, the cavity generation and expansion process
-
Anisotropy of magnetic susceptibility of the Late Cretaceous–Eocene sediments in the southeastern Fenwei Graben and its tectono-sedimentary significance Geosci. J. (IF 1.2) Pub Date : 2023-05-13 Kai Jiang, Guanzuo Wu, Guohao Si, Jiangang Li, Boyang Zheng, Qi Shen, Shida Song
The Fenwei Graben located in the conjoint region between the Neo-Tethys tectonic domain and the western Pacific tectonic domain is key to understanding the tectonic evolution of the East Asian interior. Extensive Late Cretaceous–Paleogene fluvial and lacustrine deposits within the southeastern Fenwei Graben, provide ideal archives of early tectono-sedimentary evolution in Fenwei Graben. Recently, we
-
Mineralogy, geochemistry, and sources of clay minerals in sediments of the Ulleung Basin, East Sea (Sea of Japan) Geosci. J. (IF 1.2) Pub Date : 2023-04-29 Suhyun Kim, Hyeonho An, Changhwan Kim, Kiho Yang
The provenance of sediments in the Ulleung Basin, East Sea (Sea of Japan), could be attributed to diverse sources, including the Tsushima Warm Current (TWC) and Korean coast. However, the contributions of these sources and their impacts on the composition of clay minerals, the distribution and composition of which can be used to decipher the paleoenvironment and provenance of sediments, remain obscure
-
Geochemistry of the Early Cretaceous saline lacustrine shales on the Lingshan Island, East China: implications for provenance, tectonic setting, and paleoweathering Geosci. J. (IF 1.2) Pub Date : 2023-04-28 Xiangyu Zhang, Lu Liu, Qiang Sun, Yanming Xu, Shoujun Li, Xiaoli Wang, Xuxue Wang, Ying Sun, Wenxia Wang
Early Cretaceous saline lacustrine black shales in the Fajiaying Formation were deposited under hothouse conditions and have a complex structure and history of sedimentary evolution. In this study, integrated petrographic and geochemical investigations were utilized to determine the provenance, tectonic setting, and paleoweathering conditions of these shales, therefore revealing their depositional
-
Factors influencing the slope instability of the Mussoorie-Bhitarli area, Garhwal Himalaya Geosci. J. (IF 1.2) Pub Date : 2023-04-24 Khayingshing Luirei, Manish Mehta, Atif Iqpal, Safana Nazir, Girish Ch. Kothyari
Himalaya is one of the youngest mountain systems with a fragile ecosystem due to continued collision tectonics. The endogenic and exogenic processes in the Himalaya have made landslide one of the critical surface processes continually sculpting the Himalaya. Constituting the hanging wall of the Main Boundary Thrust (MBT), the south-facing slope of the Mussoorie Syncline is prone to various slope movements
-
Rare earth elements (REEs) investigation of fly ash placers in southwestern Taurides: footprints of alkaline potassic Gölcük volcanism, Turkey Geosci. J. (IF 1.2) Pub Date : 2023-04-24 Ali Tugcan Unluer, Zeynep Doner, Mustafa Kaya, Huseyin Kocaturk, Amr Abdelnasser, Mustafa Kumral, Murat Budakoglu, Mehmet Sezai Kirikoglu
The importance of Rare Earth Elements (REE) is consistently rising for industrialized countries due to their widespread usage in various applications. Production of REE heavily relies on carbonatite-ijolite complexes and other alkaline magmatic products. With this perspective, the potassic-alkaline volcanism related fly ash placers in Burdur and Isparta regions (SW, Turkey) are considered as a valuable
-
Geochemical implication of Eu isotopic ratio in anorthosite: new evidence of Eu isotope fractionation during feldspar crystallization Geosci. J. (IF 1.2) Pub Date : 2023-04-22 Seung-Gu Lee, Tsuyoshi Tanaka, Mi Jung Lee
Rare earth element geochemistry (REE) can provide critical information on the evolution of the crust-mantle system. Europium (Eu) exists in divalent and trivalent states, and Eu2+ can substitute for Ca2+ during plagioclase feldspar crystallization in reducing magmas. This leads to positive Eu anomaly in Ca-plagioclase-rich anorthosite derived from the mantle and negative Eu anomalies in fractionated
-
Geochronological and geochemical constraints on petrogenesis of the Hongyuan intrusion in central West Junggar, Xinjiang, NW China Geosci. J. (IF 1.2) Pub Date : 2023-04-22 Shaoni Wei, Fang An, Yongfeng Zhu, Lei Zhao
Late Paleozoic intermediate-acidic intrusions, which are widespread in central West Junggar (NW China), provide critical information for regional tectonic evolution. The Hongyuan intrusion, distributed in the southeast of central West Junggar, is selected as a representative for discussion in this study. Petrological observation shows that the Hongyuan intrusion is dominated by syenogranite and monzonitic
-
The SHRIMP zircon U-Pb geochronology and microstructural study of the albite-spodumene pegmatite from the Boam Li deposit in Uljin, South Korea Geosci. J. (IF 1.2) Pub Date : 2023-04-19 Gyuseung Park, Jung-Woo Park, Chul-Ho Heo
The Boam Li deposit in Uljin, South Korea, is a hard-rock Li deposit composed of albite-spodumene pegmatite and lepidolite-elbaite greisen. The timing of Li mineralization in the Boam deposit is poorly constrained due to a wide range of the mica K-Ar ages of the greisen from 176 to 127 Ma. We investigated the microstructure, mineral composition, and U-Pb age of zircons separated from the albite-spodumene
-
Use of geochemical and mathematical models for the determination of mixing ratios in groundwater from municipal wells, Madison, Wisconsin, USA Geosci. J. (IF 1.2) Pub Date : 2023-04-18 Hesham A. Ezzeldin, Jean M. Bahr
Geochemical and mathematical methods are presented, which include NETPATH model and the Moore-Penrose pseudo-inverse (MPPI) to quantify the contributions of water from distinct recharge areas and aquifers to public supply wells in the city of Madison, Wisconsin. Previous studies investigated the hydraulic connectivity between different aquifers in the study area and proved the impact of the shallower
-
In-situ trace elements and Fe isotope compositions of magnetite in Gwanin Fe-Ti oxide deposit, South Korea Geosci. J. (IF 1.2) Pub Date : 2023-03-21 Ryoung Gyun Kim, Yeongmin Kim, Insung Lee, Yuri Choi, Hyeryeong Jeong, Kongtae Ra, Jonguk Kim
Magnetite samples from Gwanin Fe-Ti oxide deposit in South Korea were collected to identify the deposit origin and to understand the ore-forming processes. Based on the macro- and micro-scale observation, the Fe-Ti oxide ores were divided into olivine-bearing massive ore, biotite-bearing massive ore, banded ore and skarn ore. Trace elements and Fe isotope compositions of each ore type were analyzed
-
Seismic event and phase detection using deep learning for the 2016 Gyeongju earthquake sequence Geosci. J. (IF 1.2) Pub Date : 2023-03-15 Jongwon Han, Seongryong Kim, Dong-Hoon Sheen, Donghun Lee, Sang-Jun Lee, Seung-Hoon Yoo, Donghee Park
Deep learning (DL) methods have a high potential for earthquake detection applications because of their high efficiency at processing measurement data, such as picking seismic phases. However, the performance of DL methods must be evaluated to ensure that they can replace conventional methods so that full automation can be achieved. State-of-art DL methods incorporate advanced techniques and train
-
Diffusion mechanism of deep shale gas and its carbon isotope fractionation: a combined simulated and mathematical analysis Geosci. J. (IF 1.2) Pub Date : 2023-03-15 Yu Zou, Guojian Wang, Cheng Tao, Rui Zhou, Shangqing Zhang, Dongna Liu, Xiaohui Lin, Xuying Zheng
Unlike the release pressure process in shale gas exploitation, in this study, the concentration diffusion process is deeply discussed under constant temperature-pressure conditions, which aims to evaluate the preservation conditions of shale gas reservoirs in combination with isotopic fractionation characteristics. The isobaric diffusion experiment emphasized that decreasing pressure can lead to enhanced
-
Integration of remote sensing and geophysical data for structural lineaments analysis in the Rag-e-Sefid oil/gas field and surrounding areas, SW Iran Geosci. J. (IF 1.2) Pub Date : 2023-03-08 Zahra Tajmir Riahi, Khalil Sarkarinejad, Ali Faghih, Bahman Soleimany, Gholam Reza Payrovian
The major faults in the Rag-e-Sefld oil/gas field and surrounding areas are detected by integrating digital satellite, aero-magnetic, and seismic data to improve resolution and reduce ambiguity. The main structural lineaments are extracted through the processing of satellite images. The continuity of the lineaments onto the magnetic basement is analyzed by processing the aeromagnetic data, which reveals
-
Spatial variation of in situ stress at shallow depth in South Korea Geosci. J. (IF 1.2) Pub Date : 2023-03-03 Minzy Kang, Chandong Chang, Seongho Bae, Chan Park
We investigate the characteristics of in situ stress at shallow depths (< 1 km) measured from borehole hydraulic fracturing tests in South Korea by comparing them with the deep tectonic stress field. We compile a large number of hydraulic fracturing test data (stress orientations and magnitudes) from 207 boreholes over the country. A hydraulic fracturing test yields a point measure at a borehole, which
-
Ambient noise surface wave tomography of Quaternary structures derived from a high-density array in the central Hebei Depression, North China Geosci. J. (IF 1.2) Pub Date : 2023-02-19 Qingyu Wu, Qiusheng Li, Xiangyun Hu, Zhanwu Lu, Wenhui Li, Xiaoran Wang
Internal structure imaging of the Earth, along with determining basin structure, can aid in evaluating potential seismic hazards. However, the high operating cost limits the current geophysical exploration methods; moreover, it is difficult to apply these techniques over a large area, which limits our understanding of the Quaternary structure and the development of earthquake prevention science. A
-
Middle Ordovician (middle Darriwilian) Dirafinesquina and Jigunsania gen. nov. (Rafinesquinidae; Strophomenoidea; Brachiopoda) from South Korea, with discussion of rafinesquinid evolution Geosci. J. (IF 1.2) Pub Date : 2023-02-18 Yeongju Oh, Sangmin Lee, Tae-Yoon S. Park, Dong-Chan Lee
Three rafinesquinid brachiopod (Strophomenoidea) species, Dirafinesquina chosenensis, Jigunsania guraeriensis gen. et sp. nov., and Jigunsania hambaeksanensis gen. et sp. nov. are described from the Middle Ordovician (middle Darriwilian) Jigunsan and Duwibong formations in the Taebaeksan Basin, South Korea of the Sino-Korean platform of North China. Dirafinesquina chosenensis is distinguished from
-
First hand observations from the April 28, 2021 Sonitpur (MW 6.4) earthquake, Assam, India: possible mechanism involved in the occurrence of widespread ground effects Geosci. J. (IF 1.2) Pub Date : 2023-02-16 Mayank Joshi, Sambit Prasanajit Naik, Asmita Mohanty, Arun Bhadran, Drishya Girishbai, Swakangkha Ghosh
On April 28 2021, an earthquake of MW 6.4 occurred near Sonitpur, Assam, India. The epicenter was 43 km away from Tezpur, Assam with a focal depth of 34 km. The National Center for Seismology (NCS), Delhi reported the maximum intensity of MMI-V whereas the United States Geological Survey (USGS) reported the maximum intensity of MMI-VII. Preliminary reports suggest a reverse slip component for the earthquake
-
Mineralogical and geochemical study of hydrothermal dolomite from the Daliang zinc deposit in Guizhou, Southwest China: new evidence for the genesis Geosci. J. (IF 1.2) Pub Date : 2023-01-19 Weijun He, Youguo Li, Sigen Ma
The Daliang zinc deposit occurs in the southwestern Xiangxi-Qiandong Zn-Pb metallogenic belt and is located on the southeastern margin of the upper Yangtze block. In this study, we present results from petrographic observations, rare earth elements, C-H-O isotopes, and fluid inclusions. The zinc deposit is hosted by middle Cambrian dolomite. The ore-forming process is divided into three stages from
-
Petrogenesis of lavas from Mokolo-Kosséhone region, northernmost segment of the Cameroon Volcanic Line: constraints from major/trace elements and Sr-Nd-Pb isotopic data Geosci. J. (IF 1.2) Pub Date : 2022-12-21 Rikangsou Tchouhla, Merlin Gountié Dedzo, Boris Chako-Tchamabé, Gervais Onana, Djamilatou Diddi Hamadjoda, Pierre Christel Biakan à Nyotok, Klamadji Moussa Ngarena, Asobo Nkengmatia Elvis Asaah, Pierre Kamgang
This study presents major and trace elements, and Sr-Nd-Pb isotope data of the Mokolo-Kosséhone volcanic rock (basanite, trachybasalt, trachyte, and rhyolite) from the northernmost segment of the Cameroon Volcanic Line (CVL). The basanite sample exhibits primitive character (MgO: 12–14 wt%; Mg#: 69–72; Ni: 327–427 ppm; Cr: 524–599 ppm; Co: 57–60 ppm). Trace element and isotopic signatures of the mafic
-
A machine learning algorithm with random forest for recognizing hidden control factors from seismic fault distribution Geosci. J. (IF 1.2) Pub Date : 2022-11-19 Jinsu Jang, Byung-Dal So, David A. Yuen
Stress interaction among many faults in earthquake prone region is strongly affected by the spatial distribution of faults. To build a robust Machine Learning (ML) algorithm for finding hidden relationships between fault distribution and its controlling factors, the performance of ML in dependence of various parameters, such as the complexity and data size of the fault distribution, needs to be investigated
-
Non-invasive mineral analysis of pigments of wall paintings in the Sungseonjeon Hall Geosci. J. (IF 1.2) Pub Date : 2022-11-17 Na Ra Lee, So Jin Kim, Dong Hyeok Moon
Non-destructive investigations were conducted by applying various analysis methods to investigate the production period of six wall paintings of the Sungseonjeon Hall in the royal tomb of King Suro, Historic Site No. 73 in Gimhae, South Korea. Portable microscopy and portable X-ray fluorescence analysis were performed in situ, and Raman spectroscopy and X-ray diffraction were applied to small fragments