-
Permian ridge subduction in the easternmost Central Asian Orogenic Belt: Magmatic record using Sr-Nd-Pb-Hf-Mg isotopes Lithos (IF 3.39) Pub Date : 2021-01-07 Feng Wang; Kai-Chen Xing; Wen-Liang Xu; Fang-Zhen Teng; Yi-Gang Xu; De-Bin Yang
Igneous rocks related to abnormal high heat flow preserved in ancient convergent margins provide direct clues to identify fossil ridge-subduction. The Khanka Massif, as a witness of the final termination of the Paleo-Asian Ocean in Late Paleozoic, provides an ideal opportunity to trace the fossil ridge-subduction. Different types of Permian igneous rocks (282–255 Ma) were identified in composition
-
Permian to Triassic tectonic evolution of the Alxa Tectonic Belt, NW China: Constraints from petrogenesis and geochronology of felsic intrusions Lithos (IF 3.39) Pub Date : 2021-01-15 Fenquan Xie; Jinghua Wu; Yonghe Sun; Lidong Wang; Jizhong Wu; Wenjuan Jia
-
Paleoproterozoic Orosirian tectono-thermal events in the Nangrim Massif, North Korea: Cratonic and supercontinental connection Lithos (IF 3.39) Pub Date : 2021-01-15 Xiaohui Zhang; Zhili Yang; Yanbin Zhang; Mingguo Zhai; Fuyuan Wu; Peng Peng; Qiuli Li; Quanlin Hou
The Paleoproterozoic Orosirian period of ca. 2.05–1.8 Ga saw unique magmatic manifestations of Andean-type arc to Caledonian-style post-collisional batholiths, anorthosite–mangerite–charnockite– granite suites and mafic dyke swarms. Chronicling their timeline in North Korea presents a pivotal task in the palinspatic reconstruction of the Korean Peninsula relative to the North China Craton (NCC) and
-
Tetrad effect of rare earth elements caused by fractional crystallization in high-silica granites: An example from central Tibet Lithos (IF 3.39) Pub Date : 2021-01-06 Xue Shuai; Shi-Min Li; Di-Cheng Zhu; Qing Wang; Liang-Liang Zhang; Zhidan Zhao
Determining the formation mechanism (fractional crystallization vs. melt-fluid interaction) of the REE tetrad effect in high-silica granites is critical for understanding trace elemental behaviors (e.g., enrichment of rare metals) during magmatic and hydrothermal evolution. This study reports new petrography, zircon U-Pb ages, trace elemental and Hf isotopic, and whole-rock geochemical data of high-silica
-
Late Carboniferous to Early Permian ridge subduction identified in the southeastern Central Asian Orogenic Belt: Implications for the architecture and growth of continental crust in accretionary orogens Lithos (IF 3.39) Pub Date : 2021-01-07 Jialiang Li; Jingao Liu; Yujian Wang; Di-Cheng Zhu; Chen Wu
The Central Asian Orogenic Belt (CAOB) was established in response to multiple subduction-accretion-collision processes. However, the origin and evolution of the accreted arc terranes remain unclear, as exemplified by the question how ancient and juvenile materials were accreted and constructed in the accretionary belts. This question is addressed here by presenting in-situ zircon UPb and Hf isotopic
-
Dehydrogenation of deep-seated hydrous olivine in “black-colored” dunites of arc origin Lithos (IF 3.39) Pub Date : 2021-01-06 Shoji Arai; Chihiro Hoshikawa; Makoto Miura; Jun-ichi Ando; Satoko Ishimaru; Nobutatsu Mochizuki; Akihiro Tamura
Behavior and amount of hydrogen or water in olivine and other nominally anhydrous minerals in the mantle have been a matter of debate because of their significant influence on various mantle processes. Hydrogen very quickly diffuses in them so that its behavior is difficult to examine in geologic samples. Here we report traces of its presence in mantle-derived olivine, which is black in color despite
-
The Great Falls Tectonic Zone after the assembly of Laurentia: evidence for long-term tectonic stability from xenolith apatite Lithos (IF 3.39) Pub Date : 2021-01-11 Gary John O'Sullivan; Yashirvad Thakurdin; Robert Bolhar; Péter Horváth; Brendan Colin Hoare; Kenneth David Collerson
Combined U-Pb geochronology, and trace element analysis (Th, U, Y, Sr, rare earth elements: REE) by LA-Q-ICPMS and halogen chemistry (F, Cl, OH) by SEM-EDX are applied to apatite from a suite of amphibolite- and granulite-facies xenoliths from the Bearpaw Mountains (Montana, USA), to constrain cooling of Paleoproterozoic mid- to lower crust. Xenoliths hosting fluorapatite and hydroxyfluorapatite were
-
Leucite basanites of Virunga (East African Rift): some insights into petrogenesis and source composition Lithos (IF 3.39) Pub Date : 2021-01-09 N.S. Muravyeva; V.G. Senin; A.V. Ivanov; B.V. Belyatsky
The leucite basanites of the Visoke and Muhavura volcanoes from the province of Virunga (Western Branch of the East African Rift) were investigated in detail. The major and trace element contents and Sr, Nd and Pb isotopic composition in the whole rocks were determined. The isotope ratios (87Sr/86Sr: 0.70644–0.70793; 143Nd/144Nd: 0.51233–0.51243) show that these rocks are far from the bulk Earth on
-
Geodynamic setting of high-Cr chromite mineralization in nascent subduction zones: Li isotopic and REE constraints from the Zambales ophiolite, Philippines Lithos (IF 3.39) Pub Date : 2021-01-09 Peng-Fei Zhang; Mei-Fu Zhou; Graciano P. Yumul; Christina Yan Wang
-
Tracking halogen recycling and volatile loss in kimberlite magmatism from Greenland: Evidence from combined F-Cl-Br and δ37Cl systematics Lithos (IF 3.39) Pub Date : 2021-01-08 Brendan C. Hoare; Emma L. Tomlinson; Jaime D. Barnes; Sebastian Tappe; Michael A.W. Marks; Tatjana Epp; John Caulfield; Thomas Riegler
Kimberlite magmatism occurs as a result of volatile fluxed melting of the convecting upper mantle underlying cratonic lithospheric mantle regions. During passage to the Earth's surface, proto-kimberlite magma can interact with, and assimilate, variably enriched cratonic mantle producing hybrid melts consisting of asthenospheric and cratonic mantle components including contributions from metasomatic
-
Petrogenesis of the Main Range and Eastern Province granites in eastern Myanmar: New insights from zircon U–Pb ages and Sr–Nd isotopes Lithos (IF 3.39) Pub Date : 2020-11-27 Feng Cong; Fu-Yuan Wu; Wen-Chang Li; Jian-Gang Wang; Fang-Yang Hu; De-Feng He; Wei-Qiang Ji; Wei Lin; Kyaing Sein
-
A metasomatized 18O-rich veined lithospheric mantle source for ultrapotassic magmas Lithos (IF 3.39) Pub Date : 2020-12-31 Wenbo Fan; Neng Jiang; Jun Hu; Danqing Liu; Lang Zhao; Tiejun Li
While ultrapotassic rocks are generally considered to be derived from a metasomatized mantle source, whether their characteristically high δ18O values represent a primary or a secondary feature and whether the mantle metasomatism is localized or pervasive remain unresolved questions. Here we report that the old, depleted lithospheric mantle in the northern North China craton was locally metasomatized
-
Magma volume and timescales in the formation of porphyry molybdenum deposits: A case study from the Central Asian Orogenic Belt Lithos (IF 3.39) Pub Date : 2020-12-30 Qiang Zhang; Zhaochong Zhang; Zhiguo Cheng; M. Santosh; Zhenchao Wang; Shengkai Jin
Porphyry Mo deposits, as an important repository for molybdenum, are generally considered to have formed from the reworking of Mo-rich ancient crust. However, some of the giant porphyry Mo deposits in the Central Asian Orogenic Belt (CAOB) are thought to have been derived from juvenile crust. Here we evaluate the role of large volume magma chamber,and the timescales of magmatic differentiation and
-
Zircon UPb ages of Au-bearing host rocks in Northwest Iran as evidence for gold mineralization in the Carboniferous, not Cenozoic time! Lithos (IF 3.39) Pub Date : 2021-01-07 Narges Daneshvar; Mohammad Maanijou; Hossein Azizi; David R. Lentz; Chris R.M. McFarlane
-
Geochronology, geochemistry, and Sr-Nd-Pb-Hf isotopes of the late Paleozoic Dongshuigou composite pluton in the Dunhuang Block, southernmost Central Asian Orogen: Petrogenesis and implications for crustal growth Lithos (IF 3.39) Pub Date : 2021-01-07 Baoping Gan; Chunrong Diwu; Lei Wu; Tingyi Wang
Late Paleozoic granitoid rocks hold critical information regarding continental crustal growth and evolution of the Dunhuang Block in the southernmost margin of the Central Asian Orogenic Belt (CAOB). Here, we report new zircon UPb ages and Hf isotope data, and whole-rock geochemistry and Sr-Nd-Pb isotopic compositions for the Devonian granitoid rocks and dacite porphyry in the Dongshuigou area of the
-
Evolution of continental arc at root caused by igneous garnet and amphibole fractionation: Evidence from Jurassic intermediate–felsic intrusive rocks in southern Qiangtang, Tibet Lithos (IF 3.39) Pub Date : 2020-12-29 Yang Song; Wei Chen; Shaogang Wei; Xudong Ma; Miao Sun; Qingping Liu
Jurassic continental arc magmatism occurred widely across the southern Qiangtang Terrane, and provides an opportunity to study how continental arc magmas evolve towards intermediate–felsic compositions. We present new LA–ICP–MS zircon U–Pb ages, whole-rock major and trace element compositions, and Sr–Nd and in-situ zircon Hf isotope data for late Jurassic intermediate–felsic intrusive rocks from the
-
Petrology, geochemistry, ArAr isotopes of an arc related calk-alkaline pluton from Mamb (Pan-African Yaounde group, Cameroon): A testimony to the subduction of a hot oceanic crust Lithos (IF 3.39) Pub Date : 2021-01-06 Fuh Calistus Gentry; C. Nkoumbou; J. Tchakounte Numbem; Kundu Okia Mukete; J.P. Tchouankoue
In Central Africa, the Pan-African Yaoundé group is made up of migmatites and gneisses exhumed and thrusted on micaschists. In a window in the micaschists, the Mamb metagabbro massif occurs as km-size and ca 20 m-high hill crosscut by a 15 m-thick dyke of meta-hornblendite. Minor facies are biotitites, garnetites, and granitic veins. Metagabbro comprises pargasite, biotite, labrador-andesine, pyrope-
-
Major-trace element and Sr-Nd isotope compositions of mafic dykes of the Singhbhum Craton: Insights into evolution of the lithospheric mantle Lithos (IF 3.39) Pub Date : 2020-12-28 Om Prakash Pandey; Klaus Mezger; Dewashish Upadhyay; Debajyoti Paul; Ajay Kumar Singh; Ulf Söderlund; Ashley Gumsley
The Singhbhum Craton in eastern India is host to at least seven sets of mafic dyke swarms. Four previously dated swarms (studied here) include the NNE-trending Keshargaria (ca. 2.80 Ga) and Ghatgaon (ca. 2.76 - 2.75 Ga) swarms, the ENE-trending Kaptipada swarm (ca. 2.26 Ga), and the ESE-trending Pipilia swarm (ca.1.76 Ga). The dykes range in composition from basalt to andesite and have transitional
-
Morphological transition during prograde olivine growth formed by high-pressure dehydration of antigorite-serpentinite to chlorite-harzburgite in a subduction setting Lithos (IF 3.39) Pub Date : 2020-12-25 Nicole Dilissen; Károly Hidas; Carlos J. Garrido; Vicente López Sánchez-Vizcaíno; Wolf-Achim Kahl
-
Crustal melting in a protracted hot setting in the Altai Orogen (NW China): Evidence from Permian leucogranite dykes in the metamorphic belt Lithos (IF 3.39) Pub Date : 2021-01-05 Guohui Hu; Wei-(RZ) Wang; Wenjiao Xiao; Chunjing Wei; Yue Zhao; Jiangnan Liu
Numerous leucogranite dykes, and spatially associated high-grade metamorphic rocks, are well-preserved in the Chinese Altai orogenic belt. Integrated petrological, geochronological, and geochemical results of the leucogranite dykes are presented to decipher their petrogenesis and constrain the tectono-thermal setting of the Altai orogen. The leucogranite dykes have high SiO2 (71.9–81.2 wt%) and Al2O3
-
Temporal and spatial mineralogical changes in clasts from Mariana serpentinite mud volcanoes: Cooling of the hot forearc-mantle at subduction initiation Lithos (IF 3.39) Pub Date : 2021-01-05 Yuji Ichiyama; Tatsuki Tsujimori; Patricia Fryer; Katsuyoshi Michibayashi; Akihiro Tamura; Tomoaki Morishita
Mafic and ultramafic clasts (mostly ~1–5 cm in size) were recovered from three different serpentinite mud volcanos in the Mariana forearc during Integrated Ocean Drilling Program (IODP) Expedition 366. Mafic clasts from drill sites distant from the trench bear lawsonite, Al-rich riebeckite, jadeitic pyroxene (~80 mol% jadeite), and aragonite as metamorphic minerals. In contrast, mafic clasts from drill
-
Biotite composition as a tool for exploration: An example from Sn-W-Mo-bearing Mount Douglas Granite, New Brunswick, Canada Lithos (IF 3.39) Pub Date : 2020-12-10 Nadia Mohammadi; David R. Lentz; Christopher R.M. McFarlane; Xue-Ming Yang
-
Mantle heterogeneity and crust-mantle interaction in the Singhbhum craton, India: New evidence from 3340 Ma komatiites Lithos (IF 3.39) Pub Date : 2020-12-15 Priyanka Bachhar; Dilip Saha; M. Santosh; Hai-Dong Liu; Sanghoon Kwon; Amlan Banerjee; Sarbani Patranabis-Deb; Gautam K. Deb
The Singhbhum Craton in eastern India preserves the records of Paleoarchean - Mesoarchean oceanic crust dominated by ultramafic-mafic extrusive rocks (greenstones), and sialic rafts composed of tonalite-trondhjemite-granodiorite, together with younger granitoids constituting the composite Singhbhum granite batholith. The greenstone sequences, intruded by younger granitoids are entrained as synformal
-
Orogenic andesites and their link to the continental rock cycle Lithos (IF 3.39) Pub Date : 2020-12-26 Mattia Parolari; Arturo Gómez-Tuena; Carlos Errázuriz-Henao; José G. Cavazos-Tovar
-
Source rocks control the geochemical diversity of granite: The Lincang pluton in the western Yunnan Tethyan belt, SW China Lithos (IF 3.39) Pub Date : 2020-12-26 Xi-Guang Huang; Jing-Zhao Dou; Guang-Hui Wu; Jun He; Wolfgang Siebel; Fukun Chen
-
Tracking a continental deep subduction and exhumation from granulitized kyanite eclogites in the South Altyn Tagh, northern Qinghai-Tibet Plateau, China Lithos (IF 3.39) Pub Date : 2020-12-24 Yunshuai Li; M. Santosh; Jianxin Zhang; Shengyao Yu; Yinbiao Peng
Kyanite eclogites can provide insights into global orogenic processes within subduction-collision zones. Here we present an integrated study of the petrography, mineral chemistry, zircon U-Pb geochronology, and whole-rock geochemistry of granulitized kyanite eclogites from South Altyn Tagh, located at the northern margin of the Qinghai-Tibet plateau, China. Our results suggest that the rocks experienced
-
Extraction of fractionated interstitial melt from a crystal mush system generating the Late Jurassic high-silica granites from the Qitianling composite pluton, South China: Implications for greisen-type tin mineralization Lithos (IF 3.39) Pub Date : 2020-12-24 Shao-Cong Chen; Jin-Jie Yu; Min-Feng Bi
-
Native copper formation associated with serpentinization in the Cheshmeh-Bid ophiolite massif (Southern Iran) Lithos (IF 3.39) Pub Date : 2020-12-27 Alireza Eslami; Benjamin Malvoisin; Giovanni Grieco; László Előd Aradi; Claudio Marchesi; Alessandro Cavallo; Alessandra Montanini; Giulio Borghini; Ryan Mathur; Kei Ikehata; Donald W. Davis; Chun-Hui Li; Csaba Szabó
In the Cheshmeh-Bid district of the Khajeh-Jamali ophiolitic massifs (Southern Iran), mantle peridotites are intruded by abundant pyroxenite dykes. A few of these dykes are remarkable for the occurrence of native copper associated with the development of a metasomatic reaction zone. The dykes are progressively reacted, from their margins towards the center, with an amphibole + antigorite selvage, followed
-
Middle Triassic diorites from the Loei Fold Belt, NE Thailand: Petrogenesis and tectonic implications in the context of Paleotethyan subduction Lithos (IF 3.39) Pub Date : 2020-12-24 Hai Jiang; Wen-Qian Li; Kui-Dong Zhao; Di Zhang; Shao-Yong Jiang
Two Early-Middle Triassic magmatic arc belts occur in the Indochina Block within Thailand, namely the Lampang Volcanic Belt and the Loei-Phetchabun Volcanic Belt, which are about 150 km apart and run parallel to each other. The Lampang Volcanic Belt has been extensively studied and suggested to be induced by eastward Paleotethyan subduction, whereas the Loei-Phetchabun Volcanic Belt has not been well
-
Zircon from the Chuktukon alkaline ultramafic carbonatite complex (Chadobets uplift, Siberian craton) as evidence of source heterogeneity Lithos (IF 3.39) Pub Date : 2020-12-26 A.G. Doroshkevich; V.V. Sharygin; E.A. Belousova; I.A. Izbrodin; I.R. Prokopyev
The Chuktukon alkaline carbonatite complex is a part of the Chadobets complex, situated in the southwestern part of the Siberian craton. It is composed principally of aillikite-damtjernite and carbonatite and a host of Nb and REE mineralisation. Zircons were collected from drillhole samples of the damtjernites and hydrothermally overprinted carbonatites. Zircon grains show oscillatory zoning and a
-
Reworked early Precambrian basement of the Dunhuang Block (NW China) as revealed by titanite U–Pb dating Lithos (IF 3.39) Pub Date : 2020-12-31 Tingyi Wang; Chunrong Diwu; Jianghao Yan; Baoping Gan
The Dunhuang Block in the Central Asian Orogenic Belt (CAOB) consists of Archean to Paleoproterozoic crystalline basement, along with Paleozoic complexes that are related to the evolution of the CAOB. A current main controversy concerns whether the whole Dunhuang Block has experienced the Paleozoic tectonothermal events. Titanite, a common U–bearing accessory mineral in igneous and metamorphic rocks
-
Early Cambrian oceanic island-arc magmatism at the paleo-Pacific margin of East Gondwana: Evidence from northern Victoria Land (Antarctica) Lithos (IF 3.39) Pub Date : 2020-12-10 Friedhelm Henjes-Kunst; Riccardo Tribuzio; Axel Gerdes
We present new geochemical, isotopic and geochronological data for two Cambrian magmatic sequences exposed in northern Victoria Land (Antarctica) at the eastern margin of the Ross-orogenic Wilson Terrane: (i) the metavolcanic and metaplutonic rocks from the Dessent tectono-metamorphic complex, and (ii) the boninite-derived mafic-ultramafic Niagara Icefalls igneous complex. The Dessent metaigneous rocks
-
Variable origin of clinopyroxene megacrysts carried by Cenozoic volcanic rocks from the eastern limb of Central European Volcanic Province (SE Germany and SW Poland) Lithos (IF 3.39) Pub Date : 2020-12-20 Magdalena Matusiak-Małek; Jacek Puziewicz; Theodoros Ntaflos; Alan Woodland; Laura Uenver-Thiele; Jörg Büchner; Michel Grégoire; Sonja Aulbach
Clinopyroxene megacrysts occurring in Cenozoic mafic alkaline volcanic rocks from the northern margin of the Bohemian Massif (SW Poland, SE Germany) could be subdivided by colour and Mg# (Mg/(Mg + Fetot)) in three groups. Megacryst with the highest Mg# = 90.0–91.5 (“high Mg#”, HMg#) is transparent and strongly Light Rare Earth Element (LREE) depleted and contains abundant orthopyroxene lamellae. The
-
Integrated garnet and zircon petrochronology reveals the timing and duration of orogenic events in the North China Craton Lithos (IF 3.39) Pub Date : 2020-12-18 Kai-Yang Du; Hao Cheng; Jeffrey D. Vervoort
Radiometric data from accessory zircon in long-lived polymetamorphic granulite facies rocks frequently show a large spread, with no clear relationship to zircon textures. For example, the granulites and associated rocks of the North China Craton which have an apparently continuous spread of metamorphic zircon dates through the Palaeoproterozoic from c. 1.95–1.80 Ga. The data are commonly interpreted
-
Early Paleozoic accretionary orogenesis in the northeastern Indochina and implications for the paleogeography of East Gondwana: constraints from igneous and sedimentary rocks Lithos (IF 3.39) Pub Date : 2020-12-10 Yuejun Wang; Yuzhi Zhang; Xin Qian; Yang Wang; Peter A. Cawood; Chengshi Gan; Vongpaseuth Senebouttalath
-
Early–Middle Permian plutons in the Langshan area, western Inner Mongolia, China, and their tectonic implications Lithos (IF 3.39) Pub Date : 2020-12-17 Zeng-Zhen Wang; Bao-Fu Han; Li-Xia Feng; Bo Liu; Bo Zheng; Ling-Jie Kong; Cheng-Yuan Qi
Whether the southward subduction of the Paleo-Asian Ocean (PAO) beneath the northern North China Craton (NCC) was still on-going during Permian is a key issue for understanding the tectonic evolution of the southeastern Central Asian Orogenic Belt (Xing'an–Mongolia Orogenic Belt), and the voluminous Permian plutons distributed along the northern margin of the NCC can provide important insights into
-
Petrogenesis of the post-collisional rare-metal-bearing Ad-Dayheen granite intrusion, Central Arabian Shield Lithos (IF 3.39) Pub Date : 2020-12-27 Bassam A. Abuamarah; Mokhles K. Azer; Paul D. Asimow; Qingshang Shi
-
Zircon U-Pb geochronology and Sr–Nd–Pb–Hf isotope geochemistry for Permian–Early Triassic arc-related magmatism in Pohang, Jangsari, and Yeongdeok, southeastern Korean Peninsula Lithos (IF 3.39) Pub Date : 2020-12-16 Hyun-Ok Choi; Sung Hi Choi; Seung-Sep Kim
Granitoids in the southern Korean Peninsula range in age from Precambrian to Cenozoic, but were emplaced mostly during the Jurassic and Cretaceous periods. The late Permian–Early Triassic granitoids are minor in volume and restricted to the northeastern part of the Cretaceous Gyeongsang Basin (Yeongdeok and Jangsari). Here we report on Permian granites from the Cenozoic Pohang Basin of southeastern
-
External fluids cause alteration and metal redistribution in the granite-hosted Tangziwa SnCu deposit, Gejiu district, China Lithos (IF 3.39) Pub Date : 2020-12-17 Rong Xu; Rolf L. Romer; Johannes Glodny
The granite-hosted Tangziwa SnCu deposit in the Gejiu district shows variable alteration of the granite with associated mineralization. In this paper, we used whole rock chemistry mass balance calculations and Sr, Nd, Pb, Li, and B isotope data to constrain the source of metals and fluids in different alteration stages. The δ7Li and δ11B values of unaltered and weakly altered (Type I) granite samples
-
Base metal sulphide geochemistry of southern African mantle eclogites (Roberts Victor): Implications for cratonic mafic magmatism and metallogenesis Lithos (IF 3.39) Pub Date : 2020-12-09 Hannah S.R. Hughes; Charlie Compton-Jones; Iain McDonald; Ekaterina S. Kiseeva; Vadim S. Kamenetsky; Gavyn Rollinson; Judith A. Coggon; Judith A. Kinnaird; Grant M. Bybee
Platinum-group elements (PGE) display a chalcophile behaviour and are largely hosted by base metal sulphide (BMS) minerals in the mantle. During partial melting of the mantle, BMS release their metal budget into the magma generated. The fertility of magma sources is a key component of the mineralisation potential of large igneous provinces (LIP) and the origin of orthomagmatic sulphide deposits hosted
-
A non-basaltic experimental cotectic array for calc-alkaline batholiths Lithos (IF 3.39) Pub Date : 2020-12-15 Antonio Castro
A non-basaltic cotectic array has been determined to constrain the origin of Andean- (Cordilleran) calc-alkaline batholiths that form at active continental margins in response to subduction. The cotectic array is traced after the anhydrous composition of experimental liquids formed at 800–1100 °C, 3 and 10 kbar, from a synthetic model parental magma of dioritic (andesitic) composition with initial
-
Lithogeochemical and Nd isotopic constraints on felsic magmatism in the Makkovik Orogen, Labrador, Canada: Implications for assembly of the supercontinent Nuna Lithos (IF 3.39) Pub Date : 2020-12-03 Alana M. Hinchey
-
Petrological evidence for magma recharge and mixing beneath the Ma'anshan monogenetic volcano of Xiaogulihe in Northeast China Lithos (IF 3.39) Pub Date : 2020-12-13 Jian-Qiang Liu; Saskia Erdmann; Li-Hui Chen; Hui-Li Zhang; Bin Wu; Gang Zeng; Xiao-Jun Wang; Zhu-Liang Lei; Xun Yu
Geochemical compositions of rocks from monogenetic volcanoes in intraplate settings are commonly used to constrain their mantle source and melting processes; however, the subsequent magmatic evolution of such small-volume volcanic systems is commonly ignored. Here we present petrographic observations, mineral chemistry, whole-rock major and trace element data, and thermodynamic modeling for Quaternary
-
Thermal architecture of cratonic India and implications for decratonization of the Western Dharwar Craton: Evidence from mantle xenoliths in the Deccan Traps Lithos (IF 3.39) Pub Date : 2020-12-10 A.G. Dessai; A. Viegas; W.L. Griffin
The mantle beneath the Western Dharwar Craton of the Indian shield comprises a suite of refractory and fertile peridotites and mafic granulites. Detailed petrographic studies coupled with new mineral analysis and geothermobarometric estimations permit to decipher the thermal architecture and get an insight into the evolution of this ancient craton. The refractory rocks are coarse grained harzburgites/dunites
-
Geochronology and geochemistry of the ‘green-bean rock’ (GBR, a potassium-rich felsic tuff) in the western margin of the Yangtze platform, SW China: Significance for the Olenekian-Anisian boundary and the Paleo-Tethys tectonics Lithos (IF 3.39) Pub Date : 2020-12-09 Ming-Shi Feng; Wan-Bin Meng; Chun-Guang Zhang; Hai-Ruo Qing; Guo-Xiang Chi; Jun Wang; Yi-Wei Peng; Hua-Guo Wen; Hu Huang
The ‘green-bean rock’ (GBR) is a greenish or yellowish green Triassic potassium-rich felsic tuff containing prominent bean-like quartz grains, which is widespread in the Yangtze platform and Nanpanjiang basin, South China. This paper studies the age, origin and tectonic setting of the GBR from the western margin of the Yangtze platform through whole-rock geochemistry and zircon U--Pb geochronology
-
Neoproterozoic and middle Paleozoic geological events in the eastern Wolhyeonri complex of the southwestern Gyeonggi Massif, South Korea, and their tectonic correlations in northeastern Asia Lithos (IF 3.39) Pub Date : 2020-12-10 Takeshi Imayama; Chang Whan Oh; Jimin Jeon; Keewook Yi
-
Prolonged magmatism and growth of the Iran-Anatolia Cadomian continental arc segment in Northern Gondwana Lithos (IF 3.39) Pub Date : 2020-12-19 H. Shafaii Moghadam; Q.L. Li; W.L. Griffin; R.J. Stern; J.F. Santos; F. Lucci; M. Beyarslan; G. Ghorbani; A. Ravankhah; R. Tilhac; S.Y. O'Reilly
Much of the crust of Iran and Anatolia, including their oldest exposed rocks, formed during an episode of intense convergent margin (arc) magmatism as a result of subduction of oceanic lithosphere beneath northern Gondwana from ca 620 Ma to ca 500 Ma, the Cadomian crust-forming event. Most igneous rocks formed between ca 570 and 525 Ma. Cadomian crust is well-known from western and southern Europe
-
New constraints on P–T–t path of high–T eclogites in the Dabie orogen, China Lithos (IF 3.39) Pub Date : 2020-12-19 Liang-Peng Deng; Yi-Can Liu; Chiara Groppo; Franco Rolfo; Yang Yang; Xiao-Feng Gu; An-Dong Wang
-
Orosirian I-type calc-alkaline granitoids from northern Brazil: Petrogenetic implications for evolution of the central Amazonian Craton Lithos (IF 3.39) Pub Date : 2020-12-04 Cristóvão da Silva Valério; Moacir José Buenano Macambira; Valmir da Silva Souza; Elton Luiz Dantas; Roberto Dall'Agnol
-
Late Permian–Triassic tectonic nature of the eastern Central Asian Orogenic Belt: Constraints from the geochronology and geochemistry of igneous rocks in the Bureya Massif Lithos (IF 3.39) Pub Date : 2020-12-10 Xin-Yu Long; Wen-Liang Xu; Hao Yang; Jie Tang; Andrey A. Sorokin; Roman O. Ovchinnikov
The late Paleozoic–early Mesozoic tectonic nature of the eastern Central Asian Orogenic Belt (CAOB) has been subject to debate, and the late Paleozoic–early Mesozoic magmatism in the Bureya Massif provides an opportunity to address this issue. We report new zircon UPb ages, Hf isotope data, and whole-rock major and trace element data for late Paleozoic–early Mesozoic igneous rocks from the south of
-
Petrogenesis and tectonic implication of the Permian-Triassic syenogranites from the eastern segment of East Kunlun Orogen, China Lithos (IF 3.39) Pub Date : 2020-12-17 Vandi Dlama Kamaunji; Lian-Xun Wang; Chang-Qian Ma; Jing Liu; Yu-Xiang Zhu
Permian-Triassic granitoids are widespread in the East Kunlun Orogen (EKO) and are influential in the re-construction of Paleo-Tethyan tectono-magmatic activities. In this contribution, zircon UPb dating and LuHf isotopic as well as whole rock major and trace elements analysis have been conducted on a series of syenogranite plutons from the eastern segment of EKO to constrain their petrogenesis and
-
Evidence of two metamorphic cycles preserved in garnet from felsic granulite in the southern Variscan belt of Corsica, France Lithos (IF 3.39) Pub Date : 2020-12-06 Gabriele Cruciani; Marcello Franceschelli; Hans-Joachim Massonne; Giovanni Musumeci
-
Ferric-ferrous iron oxide ratios: Effect on crystallization pressure of granites estimated by Qtz-geobarometry Lithos (IF 3.39) Pub Date : 2020-12-06 Xue-Ming Yang; David R. Lentz; Guoxiang Chi
This study uses selected granite samples to evaluate the effect of redox conditions expressed as molar ferric-ferrous iron oxide ratio, Fe3+# [=Fe2O3/(FeO + Fe2O3)], on estimation of crystallization pressure (P) of granites using the Qtz-geobarometer. The results indicate that calculated P decreases significantly with increasing Fe3+# for calc-alkaline, metaluminous and peraluminous granites, but much
-
Tracking decratonization process along a cratonic edge through late Permian to late Triassic magmatic flare-up in northwestern Liaoning, North China Craton Lithos (IF 3.39) Pub Date : 2020-12-05 Zhili Yang; Xiaohui Zhang; Lingling Yuan
Resolving magmatic tempos of multiple scales along convergent plate margins presents a pivotal task in any regional tectonic and supercontinental reconstructions, as is of paramount importance for the northern North China Craton (NCC) that converged with the Central Asian Orogenic belt (CAOB) during the Paleozoic to early Mesozoic. This study applies the integrated zircon U–Pb dating and geochemical
-
Neoarchean A-type acid metavolcanics in the Keivy Terrane, northeastern Fennoscandian Shield: Geochemistry, age, and origin Lithos (IF 3.39) Pub Date : 2020-11-27 V.V. Balagansky; T.A. Myskova; P.A. Lvov; A.N. Larionov; I.A. Gorbunov
The Lebyazhka acid metavolcanics occupying 40% of the Keivy Terrane in the Arctic Region of the Fennoscandian Shield belong to mainly alkali-calcic and calc-alkaline series and are classified as peraluminous to metaluminous metadacites, metarhyodacites, metarhyolites and metatrachyrhyolites. Geochemical characteristics of most of these metavolcanics are very close or identical to those discriminative
-
Multiple Early Paleozoic granitoids from the southeastern Qilian orogen, NW China: Magma responses to slab roll-back and break-off Lithos (IF 3.39) Pub Date : 2020-12-01 He Yang; Hongfei Zhang; Wenjiao Xiao; Lu Tao; Zhong Gao; Biji Luo; Liqi Zhang
The slab dynamic processes, such as roll-back during oceanic subduction and break-off during collision orogenesis, would affect the movement of mantle material and the interaction between crust and mantle, accompanied by significant amounts of magmatism. Providing accurate depictions for these processes are extremely difficult, especially in the case of ancient orogens. Here, we present an integrated
-
The formation of shoshonitic magma and its relationship to porphyry-type mineralisation: the Maronia pluton in NE Greece Lithos (IF 3.39) Pub Date : 2020-12-03 Anna Schaarschmidt; Reiner Klemd; Marcel Regelous; Panagiotis C. Voudouris; Vasilios Melfos; Karsten M. Haase
The Oligocene shoshonitic Maronia pluton in NE Greece is part of an age-progressive belt of calc-alkaline intrusions and associated with a porphyry Cu-Mo±Re±Au mineralisation. We present new data on mineral and whole rock compositions as well as Sr, Nd and Pb isotopes of the monzodioritic to granitic rocks from Maronia, including the mineralised microgranite, which crosscuts the main intrusion. The
-
Nature of the Early Cretaceous lamprophyre and high-Nb basaltic dykes, NE Turkey: Constraints on their linkage to subduction initiation of Neotethyan oceanic lithosphere Lithos (IF 3.39) Pub Date : 2020-11-18 Orhan Karsli; Mehdi İlhan; Raif Kandemir; Abdurrahman Dokuz; Faruk Aydin; İbrahim Uysal; Levent Duygu
Late Mesozoic evolution of the Neotethys Ocean is critical and still remains unclear along the entire Sakarya Zone (SZ), Turkey, because previous interpretations of the Middle to Late Jurassic rifting of the SZ have not been consensually accepted. We identified, for the first time, the Early Cretaceous dykes intruded into the Late Jurassic and Late Carboniferous bodies in the Çamlıkaya (Erzurum) area
-
Reappraisal of the oldest high-pressure type schist in Japan: New zircon U-Pb age of the Kitomyo Schist of the Kurosegawa Belt Lithos (IF 3.39) Pub Date : 2020-11-28 Shota Matsunaga; Tatsuki Tsujimori; Atsushi Miyashita; Shogo Aoki; Kazumasa Aoki; Daniel Pastor-Galán; Keewook Yi
-
Tectonic and magmatic controls on the evolution of post-collapse volcanism. Insights from the Acoculco Caldera Complex, Puebla, México Lithos (IF 3.39) Pub Date : 2020-11-19 J.D. Pérez-Orozco; G. Sosa-Ceballos; J.L. Macías
The Acoculco Caldera Complex (ACC; 2.7–0.06 Ma) is located in the eastern part of the Trans Mexican Volcanic Belt, México. The ACC produced three major explosive eruptions: the Acoculco andesitic ignimbrite (AI; 2.7 Ma; Syn-caldera), Piedras Encimadas rhyolitic ignimbrite (1.3 Ma; Late post-caldera), and the Tecoloquillo rhyolitic ignimbrite (TI; 0.8 Ma; Late post-caldera). Faulting has been active
Contents have been reproduced by permission of the publishers.