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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）...

作者： Peng-Fei Zhang Yan-Jie Tang Yan Hu Hong-Fu Zhang Ben-Xun Su Yan Xiao M.Santosh State Key Laboratory of Lithosphere Evolution Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth Science Graduate University of Chinese Academy of Sciences Division of Interdisciplinary Science Faculty of ScienceKochi UniversityKochi 780-8520Japan

Experimental studies on the partial melting of eclogite and peridotite provide important clues on mantle metasomatism. Here,we review results from some of the recent experiments and show that melting of carbonated eclogite and peridotite can produce carbonatitic to carbonated silicate melt,in which carbonates melt preferentially before Ti oxides and silicates. Low-degree melting results in carbonatitic melt coexisting with Ti oxides and *** process also leads to the fractionation between some high-field strength elements(Nb,Ta,Zr,Hf,and HREE) and highly incompatible elements(U and Th) in the *** Ti oxides are nearly exhausted in eclogite,extremely high TiO contents(e.g.19 wt.%) are present in the melt with marked concentration of Nb and *** results help to explain the features of carbonatitic metasomatism and the Nb-Ta spike in oceanic island basalts as identified in experimental *** studies also explain the reducing conditions that stabilize diamond in the deep mantle(>150 km) as well as the occurrence of diamond at different depths reported in various *** in such a reduced mantle can happen through redox reaction between diamond,pyroxene, and olivine,in which the initial liquid is a carbonated silicate ***,the theoretical oxygen fugacity(fO) in the asthenosphere is much lower than that predicted by the reaction and requires elevated fO,which can be caused by the addition of relatively oxidized materials from the lower mantle,deep asthenospheric material,and various recycled components. A combination of these processes generates locally oxidized domains in the deep mantle.

关键词： melting experiments carbonated eclogite peridotite carbonatitic and silicate melts mantle metasomatism redox state

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Iron isotope variations in spinel peridotite xenoliths from North China Craton:implications for mantle metasomatism

Iron isotope variations in spinel peridotite xenoliths from ...

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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...

作者： Xinmiao Zhao·Hongfu Zhang·Xiangkun Zhu·Suohan Tang·Yanjie Tang State Key Laboratory of Lithopheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O.Box 9825,100029 Beijing,China Laboratory of Isotopic Geology,MLR,Institute of Geology, Chinese Academy of Geological Sciences, 100037 Beijing,China

Iron isotopes,together with mineral elemental compositions of spinel peridotite xenoliths and clino-pyroxenites from Hannuoba and Hebi Cenozoic alkaline basalts,were analyzed to investigate iron isotopic features of the lithospheric mantle beneath the North China Craton. The results show that the Hannuoba spinel peridotite xenoliths have small but distinguishable Fe isotopic variations. Overall variations inδFe are in a range of-0.25 to 0.14%o for olivine,-0.17 to 0.17‰for orthopyroxene, -0.21 to 0.27‰for clinopyroxene,and-0.16 to 0.26‰for spinel,*** has the heaviest iron isotopic ratio and olivine the lightest within individual *** clear linear relationships between the mineral pairs on"δ-δ"plot suggest that iron isotopes of mineral separates analyzed have been affected largely by some open system *** broadly negative correlations between mineral iron isotopes and metasomatic indexes such as spinel Cr#,(La/Yb) ratios of clinopyroxenes suggest that iron isotopic variations in different minerals and peridotites were probably produced by mantle metasomatism. The Hebi phlogopite-bearing lherzolite,which is significantly modified by metasomatic events,appears to be much heavier isotopically than clinopyroxene-poor lherzolite. This study further confirms previous conclusions that the lithospheric mantle has distinguishable and heterogeneous iron isotopic variations at the xenoliths scale. mantle metasomatism is the most likely cause for the iron isotope variations in mantle peridotites.

关键词： Iron isotopes mantle xenoliths Lithospheric mantle mantle metasomatism North China Craton

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Formation of Melt Pocket in mantle Peridotite Xenolith from Western Qinling, Central China: Partial Melting and metasomatism

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Journal of Earth Science 2010年第5期21卷 641-668页

作者：苏本勋张宏福 Patrick Asamoah Sakyi 秦克章刘平平英基丰汤艳杰 Sanjeewa P K Malaviarachchi 肖燕赵新苗毛骞马玉光 Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Department of Earth Science University of Ghana Legon-Accra Ghana Research School of Earth Sciences The Australian National University Canberra Act 0200 Australia

Two types of melt pockets, closed melt pocket （CMP） and open melt pocket （OMP）, are recognized from the peridotite xenoliths entrained in the Cenozoic kamafugites in western Qinling （秦岭）, Central China. The Haoti （好梯） CMPs have a mineral assemblage of olivine＋ clinopyroxene＋amphibole＋K- feldspar, whereas the Baiguan （白关） CMPs are composed of olivine＋clinopyroxene＋Umenite＋carbonate. The components of the OMPs are more complicated. In the Haoti OMPs, there are olivine, ciinopyroxene, glass, low modal abundances of amphibole, K-feldspar （Kfs）, Umenite, sulfide, chlorite, perovskite, chromite and phlogopite. The Baiguan OMPs contain olivine, clinopyroxene, glass, chlorite and chromite. Compositionally, ofivines in the CMPs and OMPs are both apparently depleted in Ni, and those in the OMPs are also depleted in Fe and Mg, and enriched in Ca compared to the primary ones. Ciinopyroxenes display large and systematical compositional variations between the CMPs and OMPs, particularly in Al, Cr, Na, Ca and Ti. Glasses are generally depleted in Si compared to the worldwide glasses in melt pockets, although they still have large variations. Amphiboles and K-feldspars have relatively restricted compositional variations. The petrographical observations and mineral chemistry suggest that the Haoti and Baiguan CMPs were generated by the in-sitn decompression melting of orthopyroxenes, olivines and clinopyroxenes, and by the addition of minor external K-rich and Ca-rich melt/fluids. The OMPs formed during the latest metasomatic event in the lithospheric mantle beneath the western Qinling.

关键词： mantle metasomatism melt pocket partial melting peridotite xenolith western Qinling.

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Melting of hydrous pyroxenites with alkali amphiboles in the continental mantle:*** relations and major element compositions of melts

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Geoscience Frontiers 2022年第4期13卷 48-74页

作者： Stephen F.Foley Isra S.Ezad Sieger R.van der Laan Maik Pertermann School of Natural Sciences Macquarie UniversityNorth RydeNew South Wales 2109Australia Research School of Earth Sciences Australian National UniversityCanberraACT 2601Australia Tata Steel Europe Research and DevelopmentIjmuidenThe Netherlands Coos Bay OregonUSA

Melting experiments on ultramafic rocks rich in the hydrous minerals phlogopite or phlogopite+K-rich terite,some including 5%of accessory phases,have been conducted at 15 and 50 *** assemblages represent probable source components that contribute to melts in cratonic regions,but whose melt compositions are poorly known.A main series of starting compositions based on MARID xenoliths consisted of a third each of clinopyroxene(CPX),phlogopite(PHL)and K-richterite(KR)with or without 5%ilmenite,rutile or *** experiments were run without KR and with higher proportions of accessory *** traps were used at near-solidus temperatures to facilitate accurate analysis of wellquenched melts,for which reversal experiments demonstrate *** show that KR melts rapidly and completely within 50°C of the solidus,so that melts reflect the composition of the amphibole and its melting *** have high SiO_(2) and especially K_(2)O but low CaO and Al_(2)O_(3) relative to basaltic melts produced from peridotites at similar *** have no counterparts amongst natural rocks,but most closely resemble leucite lamproites at 15 *** and PHL melt incongruently to form olivine(OL)and CPX at 15 kbar,promoting SiO2 contents of the melt,whereas orthopyroxene OPX is increasingly stable at lower lithosphere pressures,leading to an increase in Mg O and decrease in SiO_(2) in melts,which resemble olivine *** of mica pyroxenites without KR are richer in CaO and Al_(2)O_(3) and do not resemble *** experiments show that low CaO and Al_(2)O_(3) in igneous rocks is not necessarily a sign of a depleted peridotite *** phases produce melts exceptionally rich in P_(2)O_(5) or TiO_(2) depending on the phases present and are unlike any melts seen at the Earth’s surface,but may be important agents of metasomatism seen in *** addition of the 5%accessory phases ilmenite,rutile or apatite result in melting temper

关键词： Hydrous pyroxenite Experimental petrology mantle melts Phlogopite Lamproite mantle metasomatism

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Formation of Melt Pocket in mantle Peridotite Xenolith from Western Qinling,Central China:Partial Melting and metasomatism

Formation of Melt Pocket in Mantle Peridotite Xenolith from ...

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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...

作者：苏本勋张宏福 Sakyi Patrick Asamoah 秦克章刘平平英基丰汤艳杰 Sanjeewa PK Malaviarachchi 肖燕赵新苗毛骞马玉光 Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Department of Earth Science University of Ghana State Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Research School of Earth Sciences The Australian National University State Key Laboratory of Lithospheri cEvolution Institute of Geology and Geophysics Chinese Academy of Sciences

Two types of melt pockets,closed melt pocket(CMP) and open melt pocket(OMP),are recognized from the peridotite xenoliths entrained in the Cenozoic kamafugites in western Qinling(秦岭),Central *** Haoti(好梯) CMPs have a mineral assemblage of olivine+ clinopyroxene+amphibole+K-feldspar,whereas the Baiguan(白关) CMPs are composed of olivine+clinopyroxene+ilmenite+*** components of the OMPs are more complicated. In the Haoti OMPs,there are olivine,clinopy- roxene,glass,low modal abundances of amphibole, K-feldspar(Kfs),ilmenite,sulfide,chlorite, perovskite,chromite and *** Baiguan OMPs contain olivine,clinopyroxene,glass,chlorite and ***,olivines in the CMPs and OMPs are both apparently depleted in Ni,and those in the OMPs are also depleted in Fe and Mg,and enriched in Ca compared to the primary *** display large and systematical compositional variations between the CMPs and OMPs,particularly in Al,Cr,Na,Ca and Ti. Glasses are generally depleted in Si compared to the worldwide glasses in melt pockets,although they still have large *** and K-feldspars have relatively restricted compositional variations. The petrographical observations and mineral chemistry suggest that the Haoti and Baiguan CMPs were generated by the in-situ decompression melting of orthopyroxenes,olivines and clinopyroxenes, and by the addition of minor external K-rich and Ca-rich melt/*** OMPs formed during the latest metasomatic event in the lithospheric mantle beneath the western Qinling.

关键词： mantle metasomatism melt pocket partial melting peridotite xenolith western Qinling

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Ancient deep roots for Mesozoic world-class gold deposits in the north China craton:An integrated genetic perspective

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Geoscience Frontiers 2020年第1期11卷 203-214页

作者： Cheng-Xue Yang M.Santosh School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Department of Earth Sciences University of AdelaideAdelaideSA 5005Australia Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of EducationCollege of Marine GeosciencesOcean University of ChinaQingdao 266100China Yonsei Frontier Lab Yonsei UniversitySeoul 03722Republic of Korea

The North China Craton(NCC)hosts some of the world-class gold deposits that formed more than 2 billion years after the major orogenic cycles and *** diverse models for the genesis of these deposits remain equivocal,and mostly focused on the craton margin examples,although synchronous deposits formed in the interior *** we adopt an integrated geological and geophysical perspective to evaluate the possible factors that contributed to the formation of the major gold deposits in the *** the Archean tectonic framework of the NCC,the locations of the major gold deposits fall within or adjacent to greenstone belts or the margins of *** the Paleoproterozoic framework,they are markedly aligned along two major collisional sutures-the Trans North China Orogen and the Jiao-Liao-Ji *** the Mesozoic intrusions hosting these deposits do not carry adequate signals for the source of gold,we explore the deep roots based on available geophysical *** show that the gold deposits are preferentially distributed above zones of uplifted MOHO and shallow LAB corresponding to thinned crust and eroded sub-lithospheric mantle,and that the mineralization is located above regions of high heat flow representing mantle *** NCC was at the center of a multi-convergent regime during the Mesozoic which intensely churned the mantle and significantly en riched *** geophysical data on Moho and LAB upwarp from the centre towards east of the craton is more consistent with paleo-Pacific slab subduction from the east exerting the dominant control on lithospheric *** on these results,and together with an evaluation of the geochemical and isotopic features of the Mesozoic magmatic intrusions hosting the gold mineralization,we propose a genetic model that invokes reworking of ancient Au archives preserved in the lower crust and metasomatised upper mantle and which were generated through multiple subduction,underplating and cumulation ev

关键词： Gold metallogeny Subduction tectonics Lithospheric thinning mantle metasomatism North China craton

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Early Indosinian Weiya Gabbro in Eastern Tianshan, China: Elemental and Sr-Nd-O Isotopic Geochemistry, and Its Tectonic Implications

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Acta Geologica Sinica(English Edition) 2007年第3期81卷 424-432页

作者： ZHANG Zunzhong GU Lianxing WU Changzhi State Key Laboratory of Mineral Deposit Research （Nanjing University） Department of Earth Sciences Nanjing University Nanjing Jiangsu 210093 School of the Environment Nanjing University Nanjing Jiangsu 210093

The Weiya gabbro in eastern Tianshan was formed during the early Indosinian. This rock, with low ratios of Ce/Pb （5.74-10.16）, is notably characterized by enrichment in large ion lithophile elements （LILE）, such as Rb, K, Ba and Pb, and in high field strength elements （HSFE）, such as U and Th, but depletion in Nb and Ta. All samples of the Weiya gabbro display similar chondrite-normalized patterns with moderate enrichment in LREE （72.58-135.61ppm）, moderate depletion in HREE （15.26-25.31ppm） and mild fractionation between LREE and HREE （L/ H=4.09-5.98）. The average initial Sr value of the rock is 0.7069, and δ18O values of the rock range from 5.67‰-8.04‰. In terms of Nd isotope ratios, the Weiya gabbro is characterized by positive eNd（t） values （0.52-0.76）. All these characteristics indicate that the source region of the Weiya gabbro was metasomatized by fluids released from subducted young continental crust, with limited crustal contamination during magma ascent and emplacement. Continental （A-type） subduction was induced by northward subduction of the Paleo-Tethyan oceanic plate during the latest Permian to Triassic. From this point of view, it is supposed that tectonic conversion from the Paleo-Asian to the Paleo-Tethys regime occurred during the latest Permian or earliest Triassic.

关键词： Weiya gabbro mantle metasomatism intra-continental subduction easternTianshan Xinjiang

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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： Li-Hui Chen Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China Xin-Hua Zhou Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

The North China Craton(NCC) lost its Archean keels in the *** and intensive magmatism,mineralization,and the development of an extensional basin in the late Mesozoic NCC imply that the late Mesozoic could be the key stage for this transformation. Ultramafic xenoliths in the early-Cretaceous high-Mg diorites of Shandong province might provide key information about the massive transformation of sub-continental lithospheric mantle (SCLM) beneath the eastern part of the *** we present a unique composite dunite-orthopyroxenite xenolith from Tietcnggou,one of the high-Mg diorite-dominated plutons in Laiwu,Shandong *** petrography and mineral chemistry of the xenolith suggest complicated metasomatic processes which occurred before its entrainment in the host magma. Early-stage metasomatism includes the growth of intergranular phlogopite and clinopyroxene,and the development of a phlogopite- and amphibole-bearing clinopyroxenite ***-stage metasomatism(termed Si(Na) metasomatism) is characterized by the growth of secondary orthopyroxene,Na-rich plagioclase and amphibole with resorption of olivine and clinopyroxene, and the decomposition of *** xenolith has exceptionally high concentrations of NaO and AlO,and shows enrichments in Cs,Rb,Th,U,K,and the light rare earth *** also shows positive Pb and Sr anomalies and negative Nb,Ta,P and Ti anomalies in a primitive mantle-normalized spider *** geochemistry,as well as the elevatedδO(6.9‰),suggests that this Si(Na) metasomatism is associated with *** secondary orthopyroxene in the orthopyroxenite portion of the xenolith has exceptionally low Mg# values,which may be the result of reaction between silica-rich melts and olivine with high melt:rock ***-Fe disequilibrium of the minerals in the orthopyroxenite indicates that Si(Na) metasomatism may have been introduced shortly before entrainment of the xenolith in the host *** of the Sr-Nd-Pb

关键词： mantle xenolith mantle metasomatism lithosphere thinning subduction North China Craton

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Water contents of Roberts Victor xenolithic eclogites:primary and metasomatic controls

Water contents of Roberts Victor xenolithic eclogites:primar...

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中国科学院地质与地球物理研究所2014年度（第14届）...

作者： Jin-Xiang Huang Pei Li William L.Griffin Qun-Ke Xia Yoann Greau Norman J.Pearson Suzanne Y.O'Reilly State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChina Academy of Sciences Australian Research Council Centre of Excellence for Core to Crust Fluid Systems(CCFS) and GEMOC Department of Earth and Planetary SciencesMacquarie University CAS Key Laboratory of Crust-mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China

A suite of eclogites from the Roberts Victor kimberlite has been extensively characterized in terms of petrology and geochemical compositions(Greau et *** Geochim Cosmochim Acta 75(22):6927-6954,2011;Huang et *** Lithos 142-143:161-181,2012a).In the present study,the water contents of eclogitic garnet and omphacite were analyzed by Fourier transform infrared *** does not contain measureable OH in any *** water content of omphacite in the studied eclogites ranges from 211 to 1,496 *** metasomatism has modified the water content of some of the eclogites,while others retain water contents characteristic of their original *** OH contents of the metasomatized eclogites may be mainly controlled by the HO fugacity and mineral *** OH contents of the non-metasomatized samples are interpreted to be more sensitive to their mantle equilibration temperature,pressure,and the local fugacities of HO and *** calculatedwater content of the metasomatic medium is similar to that of carbonatitic-kimberlitic melts/*** contain more water than peridotites recorded in the literature(341±161 vs 122±54 ppm)and represent an important water reservoir in the lithospheric mantle wherever they *** is an important parameter to be considered in the interpretation of mantle processes and geophysical data such as seismic wave speeds and electrical conductivity,and in geodynamic modeling.

关键词： Eclogites Xenoliths Water content mantle metasomatism Kaapvaal craton

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