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Geochemical Characteristics and Metallogenesis of the Qingkuangshan Ni-Cu-PGE Mineralized mafic-ultramafic intrusion in Huili County, Sichuan Province, SW China

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Acta Geologica Sinica(English Edition) 2012年第3期86卷 590-607页

作者： ZHU Feilin TAO Yan HU Ruizhong MA Yansheng State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550002China Graduate University of the Chinese Academy of Sciences Beijing 100049China East China Geological Exploration Bureau of Nonferrous Metals Jiangsu ProvinceNanjing 210007China

The Qingkuangshan Ni-Cu-PGE deposit, located in the Xiaoguanhe region of Huili County, Sichuan Province, is one of several Ni-Cu-PGE deposits in the Emeishan Large Igneous Province （ELIP）. The ore-bearing intrusion is a mafic-ultramafic body. This paper reports major elements, trace elements and platinum-group elements in different types of rocks and sulfide-mineralized samples in the intrusion. These data are used to evaluate the source mantle characteristics, the degree of mantle partial melting, the composition of parental magma and the ore-forming processes. The results show that Qingkuangshan intrusion is part of the ELIP. The rocks have trace element ratios similar to the coeval Emeishan basalts. The primitive mantle-normalized patterns of Ni-Cu-PGE have positive slopes, and the ratios of Pd/Ir are lower than 22. The PGE compositions of sulfide ores and associated rocks are characterized by Ru depletion. The PGE contents in bulk sulfides are slightly depleted relative to Ni and Cu, which is similar to the Yangliuping Ni-Cu-PGE deposit. The composition of the parental magma for the intrusion is estimated to contain about 14.65 wt% MgO, 48.66 wt% SiO2 and 15.48 wt% FeOt, and the degree of mantle partial melting is estimated to be about 20%. In comparison with other typical Ni-Cu-PGE deposits in the ELIP, the Qingkuangshan Ni-Cu-PGE deposit has lower PGE contents than the Jinbaoshan PGE deposit, but has higher PGE contents than the Limahe and Baimazhai Ni-Cu deposit, and has similar PGE contents to the Yangliuping Ni-Cu-PGE deposit. The moderate PGE depletions in the bulk sulfide of the Qingkuanghan deposit suggest that the parental magma of the host intrusion may have undergone minor sulfide segregation at depth. The mixing calculations suggests that an average of 10% crustal contamination in the magma, which may have been the main cause of sulfide saturation in the magma. We propose that sulfide segregation from a moderately PGE depleted magma took place prior

关键词： Magmatic sulfide deposit mafic-ultramafic intrusion PGE Qingkuangshan Emeishan Large Igneous Province

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Methane-rich fluid inclusions from ophiolitic dunite and post-coilisional mafic-ultramafic intrusion:the mantle dynamics underneath the Palaeo-Asian Ocean through to the post-eollisional period

Methane-rich fluid inclusions from ophiolitic dunite and pos...

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中国科学院地质与地球物理研究所2006学术年会

作者： Wei Liu,Pan Xiao Fei State Key Laboratory of Lithospheric Evolution and Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,China

The protracted development history of the Palaeo-Asian Ocean starting from～1000 Ma to～320 Ma,and continuation of mantle-derived magmatism right through the post-collisional period as manifested by the widespread mafic-ultramafic intrusion and alkaline-peralkaline granite suggest a vigorous,long-running mantle *** the micro-laser Raman spectrometer,we analyzed olivine- and plagioclase-hosted fluid inclusions from ophiolitic dunite,Kudi of the western Kunlun Range,and post-collisional mafic-ultramafic intrusions of the Xiangshan and the Huangshandong,eastern Chinese Tienshan *** results show that fluids brought from the mantle by these rocks are rich in HO and CH with variable amounts of *** of the redox state,pressure and depth of formation for the melt-CH-HO+N fluid systems from the 3 rock suites of the Xinjiang,and comparison of these parameters with those of the peridotite-fluid parageneses for the sub-cratonic upper mantle give meaningful *** fluids were formed in the asthenosphere,were originally CH-N-rich,primordial mantle fluid,but have been progressively diluted with HO and become oxidized by repeated subduction of oceanic *** propose that repeated redox melting in the mantle due to dilution of CH with HO and oxidation caused formation of the long-lived Palaeo-Asian Ocean,brought about extensive intrusion of mafic-ultramafic complexes and alkaline-peralkaline granites right through the post-collisional period,and,consequently,resulted in significant Phanerozoic continental growth in the Central Asian Orogenic *** of atmospheric O and the Earth’s major oxidation occurred at about 2.4 to 2.2 *** of the Earth’s mantle promoted the mantle melting and magma input to the crust,resulting in major continental growth after 2.5 ***,much-postponed oxidation of the primordial mantle underneath the Central Asian Orogenic Belt led to significant continental growth in the Phanerozoic times.

关键词： CH4-H2O+N2 fluid inclusion dunite mafic-ultramafic intrusion redox melting Palaeo-Asian Ocean

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Tectonic setting and significance of 2.3-2.1 Ga magmatic events in the Trans-North China Orogen:New constraints from the Yanmenguan mafic-ultramafic intrusion in the Hengshan-Wutai-Fuping area

Tectonic setting and significance of 2.3-2.1 Ga magmatic eve...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of TechnologyGPO BoxU1987PerthWA 6845Australia

A detailed study of the～2.2 Ga Yanmenguan mafic-ultramafic intrusion in the Hengshan area is presented with the aim of clarifying the tectonic history of the Trans-North China Orogen in the North China Craton during the period 2.3-2.1 *** U-Pb dating of magmatic zircons from a gabbro indicates emplacement at～2193 *** whole rock and mineral geochemistry of this intrusion are akin to Alaskan-type complexes,and are typical of subduction-related *** parental magma likely originated from the depleted mantle wedge above a subduction zone,and experienced fractional crystallization of olivine and *** continental arc,represented by the mafic-ultramafic intrusions and contemporary granitic and volcanic rocks,together with the Liiliang back-arc basin constitute a marginal arc-back-arc basin system that evolved between 2.3 and 2.1 *** on geochronological datasets and available data on magmatism,metamorphism and structural deformation,a comprehensive new tectonic model for the evolution of the TNCO during the Neoarchean to Paleoproterozoic is constructed:(1)～2.5Ga intra-oceanic arc-back-arc basin system and its accretion at the end of the Neoarchean;(2)a long hiatus in magmatism and tectonism between～2.5 and 2.3 Ga;(3)～2.3-2.1 Ga marginal arc-back-arc basin magmatism developed in the accreted Hengshan-Wutai-Fuping arc terranes and the Liiliang terrane;(4)～2.1 Ga collision,resulting in closure of the～2.3-2.1 Ga Liiliang back-arc basin,accretion of the Liiliang-Hengshan-Wutai-Fuping arc terranes,and their attachment to the Western Block of the North China Craton;(5)the intrusion of～1970-1910Ma post-collisional mafic dykes in an extensional event;(6)final collision between the Western and Eastern Blocks between～1.9 and 1.8 Ga,resulting in extensive magmatism,tectonism and metamorphism;and lastly(7)post-1.8 Ga crustal extension.

关键词： mafic-ultramafic intrusion Marginal arc-back-arc basin ~2.3-2.1 Ga events Trans-North China Orogen North China Craton

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Magma source and tectonics of the Xiangshanzhong mafic-ultramafic intrusion in the Central Asian Orogenic Belt,NW China,traced from geochemical and isotopic signatures

Magma source and tectonics of the Xiangshanzhong mafic-ultra...

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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： Dongmei Tang Kezhang Qin Benxun Su Patrick Asamoah Sakyi Yongsheng Liu Qian Mao M.Santosh Yuguang Ma Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth Science University of Ghana State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences School of Earth Sciences and Resources China University of Geosciences Division of Interdisciplinary Science Faculty of ScienceKochi University

Several sulfide ore-bearing mafic-ultramafic intrusions occur along the southern margin of the Late Paleozoic Central Asian Orogenic Belt(CAOB)in north Xinjiang,NW *** origin,magma evolution and relationship with the Permian basalts in the region remain *** this study,we investigate the Xiangshanzhong maficultramafic intrusion in eastern Tianshan,dominantly composed of diorite,homblende gabbro,gabbro,hornblende pyroxenite,olivine websterite and *** report the occurrence of olivine clinopyroxenite in the intrusive complex with visible pyroxene cumulate structure,high Mg,low Cr,Na,and Ti contents,and characterized by distinctively low trace element *** data suggest that the clinopyroxene in the olivine clinopyroxenite probably crystallized from an earlier batch of *** rare earth element(REE)patterns and ENd values of the Xiangshanzhong mafic-ultramafic units suggest that these rocks represent cumulates of basaltic composition that were likely co-genetic and derived from the same magmatic *** presence of phlogopite and amphibole, occurrence of Zr Hf,Nb,and Ta negative anomalies,the trace element abundances of the parental magma,and the Nd isotopes(+5.9-+8.3)of whole-rocks suggest that the source of the Xiangshanzhong complexes may be a depleted mantle metasomatized by subducted slab-derived fluid or melt Furthermore,the(r/Sr);ratios, ENd(t)values and trace element geochemistry of whole-rock and clinopyroxene grains are consistent with those of the Permian Tuha basin *** Xiangshanzhong intrusion has characteristics of both plume and subduction-related origin and we therefore speculate that the partial melting of subduction-related depleted mantle triggered by Permian plume activity during the post-collision extension regime generated the parental magmas of the Xiangshanzhong intrusion.

关键词： Xiangshanzhong mafic-ultramafic intrusion Clinopyroxene Parental magma Emplacement mechanism Central Asian Orogenic Belt

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Fe-Ti Oxide Mineralization in the XV intrusion,Bafq Mining District,Central Iran:Insights from Mineralogy,Mineral Chemistry and S Isotopic Data

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Journal of Earth Science 2024年第5期35卷 1704-1719页

作者： Sakine Amraei Majid Ghasemi Siani Mohammad Yazdi Liang Qiu Bertrand Moine Minghua Ren Department of Inorganic Geology and Water Faculty of Earth SciencesShahid Beheshti UniversityTehran Q9XV+XG7Iran Department of Geochemistry Faculty of Earth SciencesKharazmi UniversityTehran PC3G+QPJIran State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China Université Clermont Auvergne CNRSIRDOPGCLaboratoire Magmas et VolcansAubiere F-63178France Department of Geoscience University of NevadaLas Vegas NV 89154USA

The mafic-ultramafic intrusion in the XV anomaly area,contains magmatic Fe-Ti oxides±(p)ore,is located in the Bafq mining district in the Central *** consists of cumulate and layered Fe-Ti-bearing gabbros and *** mineral assemblages include clinopyroxene,Fe-Ti oxides,plagioclase,amphibole,apatite and sulfides(pyrite and chalcopyrite).The Fe-Ti oxides mainly consist of magnetite-titanomagnetite and ilmenite,which occurred as disseminated,intergrowth,lamellae(trellis and sandwich textures)and *** in the gabbroic rocks is from the near end-member of Fe_(3)O_(4)(<1 wt.%TiO_(2))to titanomagnetite containing up to 8 wt.%TiO_(2)(about3.73 wt.%to 26.84 wt.%Ulvospinel(X_(Usp))).Magnetite in pyroxenite rocks is characterized with TiO_(2)range from 0.46 wt.%to 3.14 wt.%(X_(Usp)varied from 1.76 wt.%to 10.46 wt.%).The abundances of V_(2)O_(3)range from 0.03 wt.%to 1.29 wt.%and 0.24 wt.%to 1.00 wt.%for gabbro and pyroxenite,respectively.X_(Usp)contents of magnetite show insignificant correlations with Al_(2)O_(3)and *** average XIlmin the ilmenite of gabbro is 92%,whereas it is 90.37%in the pyroxenite *** MgO and V_(2)O_(3)contents show a slightly positive correlation with TiO_(2)in *** composition of clinopyroxenes in gabbro and pyroxenite rocks fall in the diopside to augite field with Mg#ranging from 67 to 98 and 74 to 96,*** both rock types,amphiboles are mainly pargasite and rarely *** in pyroxenite rocks is clustered in the labradorite to andesine fields with a compositional ranges of An46-69and in gabboic rocks fall in two fields with compositional ranges of albite with An0.65-5.95and labradorite with ***δ34S isotopic values cover a limited range from+3.15‰to+4.10‰V-CDT consistent with magmatic ***-Ti mineralization is formed in two stages,minor inclusions of Fe-Ti oxide minerals in the pyroxene and plagioclase crystallized in the early magmatic stage,whereas interstitial oxide

关键词： mafic-ultramafic intrusion Fe-Ti oxides gravitational settling mineral chemistry Bafq mining district Central Iran mineral deposits

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Geochemical and Petrological Studies on the Early Carboniferous Sidingheishan mafic-ultramafic Iintrusion in the Southern Margin of the Central Asian Orogenic Belt,NW China

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Acta Geologica Sinica(English Edition) 2018年第3期92卷 952-971页

作者： SUN Tao QIAN Zhuangzhi THAKURTA Joyashish YANG Shenghong XU Gang DUAN Jun GAO Bo WANG Jing School of Resource Environment and Earth Sciences Yunnan University MOE Key Laboratory of Western China's Mineral Resources and Geological Engineering College of Earth Science and Recourses Chang'an University Department of Geosciences Western Michigan University Department of Geosciences University of Oulu Faculty of Land Resource Engineering Kunming University of Science and Technology

The Sidingheishan mafic-ultramafic intrusion is located in the eastern part of the Northern Tianshan Mountain, along the southern margin of the Central Asian Orogenic Belt in northern Xinjiang autonomous region of China. The Sidingheishan intrusion is mainly composed of wehrlite, olivine websterite, olivine gabbro, gabbro and hornblende gabbro. At least two pulses of magma were involved in the formation of the intrusion. The first pulse of magma produced an olivine-free unit and the second pulse produced an olivine-bearing unit. The magmas intruded the Devonian granites and *** age of 351.4±5.8 Ma(Early Carboniferous) for the Sidingheishan intrusion has been determined by U-Pb SHRIMP analysis of zircon grains separated from the olivine gabbro unit. A U-Pb age of 359.2±6.4 Ma from the gabbro unit has been obtained by LA-ICP-MS. Olivine of the Sidingheishan intrusion reaches 82.52 mole% Fo and 1414 ppm Ni. On the basis of olivine-liquid equilibria, it has been calculated that the MgO and FeO included in the parental magma of a wehrlite sample were approximately10.43 wt% and 13.14 wt%, respectively. The Sidingheishan intrusive rocks are characterized by moderate enrichments in Th and Sm, slight enrichments in light REE, and depletions in Nb, Ta, Zr and Hf. The εNd(t) values in the rock units vary from +6.70 to +9.64, and initial87Sr/86Sr ratios range between 0.7035 and0.7042. Initial206Pb/204Pb,207Pb/204Pb and208Pb/204Pb values fall in the ranges of 17.23-17.91,15.45-15.54 and 37.54-38.09 respectively. These characteristics are collectively similar to the Heishan intrusion and the Early Carboniferous subduction related volcanic rocks in the Santanghu Basin, North Tianshan and Beishan area. The low(La/Gd)PMvalues between 0.26 and 1.77 indicate that the magma of the Sidingheishan intrusion was most likely derived from a depleted spinel-peridotite mantle.(Th/Nb)PMratios from 0.59 to 20.25 indicate contamination of the parental magma in the upper ***

关键词： break-off of subducted slab zircon U-Pb dating whole-rock Sr-Nd-Pb isotopes mafic-ultramafic intrusion southern margin of Central Asian Orogenic Belt China

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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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Geochemistry and genesis of magmatic PGE-bearing Cu-Ni sulphide deposit in Wadi Bayhan,southeastern Yemen

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Global Geology 2011年第1期14卷 15-20页

作者： Moteea A. Al-Shameery SUN Fengyue M. Alqadasi M. Mattash College of Earth Sciences Jilin University Changchun 130061 China Geological Survey and Mineral Resources Board Sana＇a Yemen

The Wadi Bayhan mafic-uhramafic intrusions associated with magmatic PGE-bearing Cu-Ni sulphide deposit are located in the south margin of the Arabian-Nubian Shield, SW Yemen. The intrusions consist of du- nite, olivine-pyroxenite, lherzolite, hornblendite, gabbro and gabbronorite. The dunite and lherzolite are the main host rock for the Cu-Ni ores. The new data of the chemical compositions of the rocks have SiO2 （50% - 53.6% ）, AI203 （0-32%） and MgO （4%-28%）, and relatively low TiO2 （0-3.2%） and K2 0 ＋ Na20 （0. 04% - 5.2% ）. The geochemical characteristics indicate that the parental magma is high-magnesium tholeiitic. Sulfur had reached saturation and immiscible sulfides droplets segregated from silicate magmas before their emplacement.

关键词： magmatic sulphide Wadi Bayhan mafic-ultramafic intrusion

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