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crustal contamination of the Mantle-Derived Liuyuan Basalts:Implications for the Permian Evolution of the Southern Central Asian Orogenic Belt

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Journal of Earth Science 2022年第5期33卷 1081-1094页

作者： Yuanyang Yu Keqing Zong Yu Yuan Reiner Klemd Xin-Shui Wang Jingliang Guo Rong Xu Zhaochu Hu Yongsheng Liu State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China GeoZentrum Nordbayern Universität Erlangen-NürnbergSchlossgarten 5aErlangenD-91054Germany State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China

The Permian basalts in the Central Asian Orogenic Belt(CAOB)are crucial for constraining the closure of the Paleo-Asian ***,the origin of these basalts is still under ***,we present comprehensive bulk-rock geochemical,Sr-Nd-Pb-Hf isotopic,and zircon U-Pb-Lu-Hf isotopic data of the Liuyuan basalts and coexisting gabbros,which are located in the Beishan Orogen in the southern CAOB,to constrain their emplacement setting and tectonic *** new gabbro ages of ca.288–294 Ma are interpreted to represent the formation time of the Liuyuan basaltic *** Liuyuan basalts show MORB-like rare earth element(REE)patterns and bulk-rockε_(Hf)(t)andε_(Nd)(t)values of 11.0–15.4 and 4.6–9.2,respectively,suggesting an origination mainly from a depleted mantle ***,positive Pb anomalies,Nb-Ta depletions,and high Th/Yb ratios as well as evolved Sr-Nd-Pb-Hf isotopic compositions of some samples indicate variable continental crustal *** to the covariation of Pb anomalies(Pb^(*)=2×Pb_(N)/(Ce_(N)+Pr_(N)))with Sr-Nd-Pb-Hf isotopic compositions,we speculate that parent magma of the Liuyuan basalt was contaminated by continental crustal materials during the eruption rather than having been generated from an enriched mantle *** revealed by mixing modelling,the Liuyuan basaltic magmas would require a minor(crustal assimilation to explain the enriched trace elemental and radiogenic Sr-Nd-Pb-Hf isotopic ***,the Liuyuan basaltic belt is believed to have been generated in a continental extensional environment instead of an oceanic setting and does not constitute a Permian ophiolitic suture zone as previously suggested,since the Paleo-Asian Ocean was already closed in the southern Beishan Orogen in the Early Permian.

关键词： crustal contamination Liuyuan basaltic belt Central Asian Orogenic Belt Beishan Orogen Pb anomaly tectonics

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Tracing crustal contamination of the Cenozoic basalts with OIB-affinity in northern marginal region of North China Craton:An Os perspective

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China Geology 2021年第4期4卷 593-599页

作者： Zhuang Li Bin Chen State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China

The Cenozoic basalts with OIB-affinity in northern marginal region of the North China Craton are thought to experience minor even no crustal contamination during the magma *** whole-rock Sr-Nd-Pb-Hf isotopes are attributed to a two-component mixing between depleted and enriched mantle sources,while the major element variations are controlled by the fractional crystallization of olivine and ***,in this study,the new Os isotopic data proposes an opposite model for the Cenozoic basalts in northern marginal region of the North China *** this model,the Jining basalts were contaminated by the Archean mafic rocks during the magma storage and *** crustal contamination process is supported by(1)the highly radiogenic Os isotopic compositions,and(2)the positive correlation between 187Os/188Os and 1/Os of the Jining *** modeling the Os isotopic composition of the basalts,an incorporation ofcrustal *** isotopic data acts as an indicator of crustal contamination during magma evolution,providing us a novel insight into the evolution of the intra-continental OIB-like basalts worldwide.

关键词： crustal contamination OIB-like basalt Os isotope Os concentration Geological survey engineering Inner Mongolia North China Craton China

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The role of crustal contamination in the formation of Ni-Cu sulfide deposits in Eastern Tianshan,Xinjiang,Northwest China:Evidence from trace element geochemistry,Re-Os,Sr-Nd,zircon Hf-O,and sulfur isotopes

The role of crustal contamination in the formation of Ni-Cu ...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Dong-Mei Tang Ke-Zhang Qin He Sun Ben-Xun Su Qing-Hua Xiao Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Institute of Mineral Resources Research China Metallurgical Geology Bureau

Tulaergen,Xiangshan,***,and Baishiquan magmatic Ni-Cu sulfide deposits,which are all located in the eastern part of the Central Asian Orogenic Belt,and associated with small mafic-ultramafic intrusions with high-grade Cu and Ni orebodies have similar ages of *** magma sources are MORB-like and OIB-like depleted *** calculations of Sr-Nd and zircon Hf isotopic data show that about 10-15% of oceanic slab components are added into the source of Baishiquan and Tianyu intrusions,but only less than 5% are in the three other *** higher degree of subduction metasomatism in the Baishiquan and Tianyu magma sources is likely Lhe resulL of the Paleozoic multiple-stage ***,the relative enrichment of LILE,depletion of HFSE,and lower Ce/Pb ratios indicate that these intrusions experienced crustal *** effects of crustal contamination are also identified in the magmatic sulfide deposits by the higher zircon δO,higher sulfide γOs,and δS values *** propose a two-stage crustal contamination model of the Tulaergen,Xiangshan,Tianyu,and Baishiquan ***,the Huangshan intrusion,which has the highest degree of crustal contamination, likely experienced only single-stage upper crustal contamination(～14.2% ).The addition of crustal S appears to be directly related to triggering S saturation in these *** to a simple S isotopic modeling calculation,11% ,2.9% ,1.2% and 2.1% of the crustal sulfur addition into the parental magma would be required to form the Tianyu,Baishiquan,Xiangshan,and Tulaergen deposits, respectively.

关键词： Eastern Tianshan Ni-Cu sulfide deposits Re-Os and S geochemistry Source characteristics crustal contamination

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crustal contaminations Responsible for the Petrogenesis of Basalts from the Emeishan Large Igneous Province,NW China:New Evidence from Ba Isotopes

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Journal of Earth Science 2022年第1期33卷 109-120页

作者： Dong Yi Jing Zhao Chunhui Li Xiuhong Peng Department of Geochemistry College of Earth SciencesChengdu University of TechnologyChengdu 610059China

Emeishan large igneous province (ELIP),one of the largest continental volcanic provinces worldwide (e.g.,Karoo),is extensively distributed along the western margin of the Yangtze *** though the consensus that the ELIP is of a plume-related origin has been reached for decades,the role of crustal contamination in the petrogenesis of these basalts is still debatable so *** paper firstly reports the Ba isotopic compositions of the continental flood basalts from the Lijiang,Miyi and Emeishan regions to discuss the genesis of basalts from the *** to their TiO_(2) contents and Ti/Y ratios,these basalts are divided into two groups,the low-Ti basalts from Lijiang and the high-Ti basalts from Miyi and *** Ba isotopic compositions show that the low-Ti basalts have the δ^(138/134)Ba values from-0.33‰to+0.23‰with an average of-0.02‰±0.40‰,and the high-Ti basalts from -0.38‰to+0.38‰with an average of 0.038‰±0.36‰,all of which show a wider range of Ba isotopes relative to that of the primitive mantle (PM).This is unlikely to be explained by partial melting,fractional crystallization or even chemical weathering owing to little Ba isotopic fractionation during these *** contrast,variable extents of crustal contamination into the basaltic magmas more likely resulted in such isotopic *** ratios of incompatible elements (e.g.,Nb/U,La/Nb,and Nb/Y) further suggest that the low-Ti basalts experienced higher degrees of crustal contaminations than those high-Ti basalts,which is well consistent with their spatial *** general,the basaltic magmas in the ELIP were probably contaminated by different degrees of crustal materials during their upwelling to the surface.

关键词： Emeishan large igneous province Ba isotope petrogenesis crustal contamination isotopes

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Geochronology, Geochemistry and Sr-Nd-Pb-Hf Isotopes of No. I Complex from the Shitoukengde Ni–Cu Sulfide Deposit in the Eastern Kunlun Orogen, Western China: Implications for the Magmatic Source, Geodynamic Setting and Genesis

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 106-126页

作者： LI Liang SUN Fengyue LI Bile LI Shijin CHEN Guangjun WANG Wei YAN Jiaming ZHAO Tuofei DONG Jun ZHANG Dexin College of Earth Sciences Jilin University Changchun 130061 China Qinghai Bureau of Geological Survey Xining 810001 China No. 108 Geological Party Sichuan Bureau of Geology and Mineral Exploration Chengdu 611230 China

The Shitoukengde Ni-Cu deposit, located in the Eastern Kunlun Orogen, comprises three mafic-ultramafic complexes, with the No. I complex hosting six Ni-Cu orebodies found recently. The deposit is hosted in the small ultramafic bodies intruding Proterozoic metamorphic rocks. Complexes at Shitoukengde contain all kinds of mafic-ultramafic rocks, and olivine websterite and pyroxene peridotite are the most important Ni-Cu-hosted rocks. Zircon U-Pb dating suggests that the Shitoukengde Ni-Cu deposit formed in late Silurian （426-422 Ma）, and their zircons have ~Hf（t） values of-9.4 to 5.9 with the older TDMm ages （0.80-1.42 Ga）. Mafic-ultramafic rocks from the No. I complex show the similar rare earth and trace element patterns, which are enriched in light rare earth elements and large ion iithophile elements （e.g., K, Rb, Th） and depleted in heavy rare earth elements and high field strength elements （e.g., Ta, Nb, Zr, Ti）. Sulfides from the deposit have the slightly higher ~34S values of 1.9-4.3%o than the mantle （0 ~ 2%o）. The major and trace element characteristics, and Sr-Nd-Pb and Hf, S isotopes indicate that their parental magmas originated from a metasomatised, asthenospheric mantle source which had previously been modified by subduction-related fluids, and experienced significant crustal contamination both in the magma chamber and during ascent triggering S oversaturation by addition of S and Si, that resulted in the deposition and enrichment of sulfides. Combined with the tectonic evolution, we suggest that the Shitoukengde Ni-Cu deposit formed in the post-collisional, extensional regime related to the subducted oceanic slab break-off after the Wanbaogou oceanic basalt plateau collaged northward to the Qaidam Block in late Silurian.

关键词： Sr-Nd-Pb-Hf isotopes crustal contamination oceanic slab break-off post-collisionalextension Shitoukengde Ni-Cu deposit Eastern Kunlun Orogen

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Geology and mineralization of the Hongqiling large magmatic nickel-copper-cobalt deposit(22×10^(4)t)in Jilin Province,China:A review

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China Geology 2024年第4期7卷 762-796页

作者： Cong Chen Yu-chao Gu Di Zhang Tao-tao Wu Ai Li Yun-sheng Ren Qing-qing Shang Jian Zhang Xiong-fei Bian Fei Su Jia-lin Yang Qiu-shi Sun Xiao-hai Li Wan-zhen Liu Zhen-ming Sun Sen Zhang Yu-hui Feng Shenyang Center of China Geological Survey Shenyang 110034China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China College of Computer Science&Technology Qingdao UniversityQingdao 266071China Institute of Disaster Prevention Langfang 065200China College of Earth Sciences Jilin universityChangchun 130000China Geological Survey Institute of Jilin Province Changchun 130000China School of Surveying and Mapping Engineering Changchun Institute of TechnologyChangchun 130000China Physical Geological Materials Center of Natural Resources China Geological SurveyLangfang 065200China Shenyang Normal University Shenyang 110034China

The Hongqiling large nickel-copper-cobalt deposit(hereafter referred to as the Hongqiling deposit),a typical mafic-ultramafic copper-nickel deposit in China,boasts proven Ni(Ni)resources of approximately 22×10^(4)t,associated copper resources of 2×10^(4)t,and associated cobalt(Co)resources of 0.5×10^(4)t,with Ni reserves ranking 10th among China's magmatic nickel ***,the Hongqiling deposit is situated in the superimposed zone between the Xing'an-Mongolian orogenic belt and the circum-Western Pacific's active continental margin *** ore-bearing plutons occur within the metamorphic rocks of the Ordovician Hulan Group,with the emplacement of plutons and the locations of orebodies governed by the deep-seated Huifahe fault and its secondary NW-trending Fujia-Hejiagou-Beixinglong-Changsheng fault *** the deposit,the rock assemblages of ore-bearing plutons predominantly encompass gabbro-pyroxenite-olivine pyroxenite-pyroxene peridotite(pluton No.1)and norite-orthopyroxenite-harzburgite(pluton No.7),with ore-bearing lithofacies consisting primarily of olivine pyroxenite and pyroxenite *** Hongqiling deposit hosts stratoid,overhanging lentoid,veined,and pure-sulfide veined *** ores principally contain metallic minerals including pyrrhotite,pentlandite,chalcopyrite,violarite,and *** unidentified magma sources of ore-bearing mafic-ultramafic rocks,it is roughly accepted that the magmatic evolution in the Hongqiling deposit primarily involved fractional crystallization and crustal *** ore-forming materials were primarily derived from the upper mantle,mixed with minor crustal *** ore-bearing mafic-ultramafic rocks in the deposit,primarily emplaced during the Indosinian(208-239 Ma),were formed in an intense extension setting followed by the collisional orogeny between the North China Plate and the Songnen-Zhangguangcai Range Block during the Middle-Late *** the perspective of the metallogen

关键词： Nickel-copper-cobalt deposit Fractional crystallization crustal contamination Magmatic Mineralization Re-Os isotopic age Sulfur isotopic Metallogenic mode Prospecting model Western Pacific’s active continental margin Mineral exploration engineering Hongqiling Jilin

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Petrogenesis of Volcanic Rocks in Alasht, Mazandaran, Iran

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Open Journal of Geology 2016年第3期6卷 131-145页

作者： Mohammad Ali Arian Mohammad Hasan Bazoobandi Reza Elmi Department of Geology Faculty of Sciences North Tehran Branch Islamic Azad University Tehran Iran Faculty of Science Shahid Sherafat University of Farhangian Tehran Iran

Area studied in this paper is located in the northwest of city of Alasht. The most important varieties of studied rocks are volcanic and semi-volcanic rocks of basic nature. These rocks, which form a distinguishable solid mass on 1:100,000 geological map, belong to Cretaceous period. According to results of petrographic study, rocks of this area include olivine basalt, dolerite, gabbro and microgabbro, and all have almost similar chemical compositions. According to chemistry-based naming process carried out through TAS method, these rocks are entirely basalt and basic and are all products of Sub-alkaline-Tholeiitic magma. According to Harker diagrams, a magmatic differentiation can be observed in all volcanic rocks;furthermore, basaltic magma erupted in this area has undergone an alteration and possibly a crustal contamination. The spider diagrams plotted in this paper show that basic rocks of Alasht area (basalts, andesite basalts, dolerites, gabbros and microgabbros) are all mostly similar to ocean island basalts (OIB). Once field study, sampling and microscopic study stages were complete, ten samples were selected for chemical analysis and were analyzed by XRF method.

关键词： Alasht Area crustal contamination Olivine Basalt Sub-Alkaline

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Geochemistry and Petrogenesis of Tertiary Volcanic Rocks of the Eastern Roodbar, Alborz Mountain, North of Iran

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Open Journal of Geology 2016年第10期6卷 1296-1311页

作者： Zahra Shafeie Mohammad Ali Arian Shahrouz Haghnazar Mansour Vossoughi Abedini Department of Geology Faculty of Science North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Faculty of Science Lahijan Branch Islamic Azad University Lahijan Iran Department of Geology Faculty of Science Science and Research Branch Islamic Azad University Tehran Iran

In the Alborz Mountains of the eastern Roodbar (north of Iran), Tertiary volcanic rocks have a variety of composition between olivine basalt, basaltic andesite, pyroxene andesite and andesite. The presence of different xenoliths and xenocrysts is among the evidence of crustal contamination of these rocks. The positive correlations of CaO/Al2O3 vs to MgO and Al2O3 vs. SiO2 are of signs of the olivine and clinopyroxene fractionation in the variation trend of the area rocks. Positive correlations K2O/P2O5 vs with SiO2 and La/Sm vs. K2O/P2O5 demonstrate contamination of magma with the continental crust. The incompatible trace element patterns and their comparison with crustal contents indicate contamination of the rocks of the area with the lower and upper continental crust. Linear trends in the variation diagram of Nb/Y vs. Zr/Y, introduce two different source regions: a MORB source and the other continental crust for the rocks which are the genesis. The variations of Y/Nb vs. Zr/Nb and Rb/Y vs. Nb/Y reveal a crustal contamination of the magma originated from the MORB source. Geochemical studies represent that the area’s rocks were derived from the 15% melting of a mantle source of MORB type with spinel facies within a continental environment, which was contaminated by varying degrees of continental crustal rocks.

关键词： Volcanic Rocks Tertiary MORB Source Mantle crustal contamination

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Geochemistry of Mafic Rocks from the Birimian Basement of Doropo (Northeast of Côte d’Ivoire): Petrogenetic and Geodynamic Implications

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Open Journal of Geology 2022年第6期12卷 504-520页

作者： Wilfried Digbeu Alain Nicaise Kouamelan Asinne Tshibubudze Ziandjêdé Hervé Siagne Fossou Jean-Luc Hervé Kouadio Laboratoire de Géologie Ressources Minérales et Energétiques Université Félix Houphou&#235 t-Boigny Abidjan-Cocody C&#244 te d’Ivoire Council for Geosciences Pretoria South Africa

The northeastern region of Côte d’Ivoire is characterised by a granitic basement mainly composed of biotite granite rocks. According to mapping work in the Gbabédjou and Doropo areas, these Birimian granitoids are cut by gabbro dykes and amphibolite enclaves, which are the subject of this study. In order to better understand the role and the implication of mafic rocks in the Doropo basement emplacement, a multidisciplinary methodology integrating microscopic observations and geochemical analyses of major and trace elements was carried out on 4 samples considered representative of the outcrops studied. Green hornblende, clinopyroxene, and accessory sphene minerals are found in mafic mineral phases, according to petrographic research. Whole-rock analyses reveal that mafic samples with TiO2 contents 1.1 ratios giving them an orogenic granite nature (I-type). Their REE patterns are moderately fractionated (La/Sm)N = 2.66 - 6.13 and (La/Yb)N = 11.17 - 43.70) with a very negative Eu anomaly (Eu/Eu* = 0.75 - 0.97). The multi-element diagrams are characterized by negative Nb-Ta anomalies and geotectonic studies have identified them as volcanic arc formations. All these characteristics allowed us to distinguish the Doropo mafic rocks as formations originating from the juvenile continental crust, emplaced under the Archean tectonics model with significant crustal contamination in the source. Magma driven by mantle diapir has been injected at the base of the continental crust and the heat induces the partial melting of the overlying crust giving rise to mixed liquids. This magma now enriched in LILE was immediately drained to the upper crust to form the mafic rocks from the studied area.

关键词： Doropo Mafic Intrusive Birimian crustal contamination

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Late Paleozoic mafic-ultramafic intrusions in southern Central Asian Orogenic Belt(NW China):Insight into magmatic Ni-Cu sulfide mineralization in orogenic setting

Late Paleozoic mafic-ultramafic intrusions in southern Centr...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Ben-Xun Su Ke-Zhang Qin Dong-Mei Tang Patrick Asamoah Sakyi Ping-Ping Liu He Sun Qing-Hua Xiao Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth Science University of Ghana

The mafic-ultramafic intrusions hosting magmatic Ni-Cu sulfide ore deposits,usually present within the Precambrian cratons and on their margin,have been extensively studied,whereas those occurring within the Phanerozoic orogenic belts have received little *** southern margin of the Central Asian Orogenic Belt is a region of late Paleozoic mafic-ultramafic intrusions emplaced during post-orogenic *** order to recognize the mineralization features,this study compares barren or weakly mineralized mafic-ultramafic intrusions in the Beishan with those hosting Ni-Cu sulfide ore deposit in the Altay and Eastern Tianshan in petrology,mineralogy and geochemistry *** mineralization features can be recognized with respects to petrology,mineralogy and geochemistry from comprehensive comparisons. Among the mineralization indicators,we highlight strong alteration accompanying sulfide emplacement, post-erosion exposure of magma conduit,abundant primary hydrous minerals and potential transportation mechanism of ore-forming elements:Other indicators are the presence of orthopyroxene and pyroxenite for potential sulfide formation through crystal fractionation,restricted Fo and Ni ranges in olivines for sulfide segregation,and some other special geochemical characteristics related to crustal contamination,The variation in mineralization could be ascribed to different degrees of partial melting,crustal assimilation and subduction-related modification of a mantle *** suggest that the Ni-Cu sulfide mineralization of mafic-ultramafic intrusions within orogenic belts is remarkably different from that of cratonic and continental marginal settings in respects of petrogenesis and mineralizing *** conduit-type Ni-Cu sulfide ore deposit is a target for future prospecting and exploration for mafic-ultramafic intrusions in the orogenic belts.

关键词： Central Asian Orogenic Belt Mafic-ultramafic intrusion Ni-Cu sulfide mineralization crustal contamination Subduction-modified mantle source

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