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The genesis of mantle-derived sapphirine

The genesis of mantle-derived sapphirine

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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： ben-xun su HONG-FU ZHANG YAN HU M.SANTOSH YAN-JIE TANG YAN XIAO State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Interdisciplinary science Kochi UniversityAkebono-cho 2-5-1Kochi 780-8520Japan

Sapphirine,a typical ultrahigh-temperature metamorphic mineral,is rarely found in mantle xenohths. Here we report the occurrence and characteristics of sapphirine in a mantle-derived xenolith from the Cenozoic basalts of Hannuoba in the North china *** xenolith consists of a clinopyroxene, spinel,and sapphirine assemblage,with the sapphirine occurring as the reaction rim surrounding *** mineral compositions of this sample are all characterized by high Mg contents,similar to those of minerals from other sapphirine-bearing rocks reported from high-Mg-Al granulites elsewhere in the *** is relatively rich in Al and Ca in comparison to pyroxene in peridotite and pyroxenite xenoliths in the Hannuoba basalts,as well as in global mafic and felsic granulites in other terranes,a feature that is consistent with the bulk *** P-T compilations from both experimental and natural rock data show a restricted stability field for the coexisting clinopyroxene + spinel + sapphirine assemblage of around 8-15 kbar and 800-900℃.The rare occurrence of sapphirine in a mantle-derived xenolith therefore suggests specific bulk composition,restricted P-T range and possible melt-peridotite *** conditions are best satisfied in a tectonic setting with basaltic magma underplating and interactionbetween the infiltrating melts and the wall-rock peridotite.

关键词： Sapphirine,pyroxenite P-T condition North china Craton

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Breakdown of orthopyroxene contributing to melt pockets in mantle peridotite xenoliths from the Western Qinling,central china:constraints from in situ LA-ICP-MS mineral analyses

Breakdown of orthopyroxene contributing to melt pockets in m...

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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： ben-xun su Hong-Fu Zhang Yue-Heng Yang Patrick Asamoah Sakyi Ji-Feng Ying Yan-Jie Tang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth science University of GhanaP.O.Box LG 58Legon-AccraGhana

Major and trace element compositions of constituent minerals,partly decomposed rims of orthopyroxenes (DRO),’closed’ melt pockets(CMP) and open melt pockets (OMP) in some Western Qinling peridotite xenoliths were obtained by *** core-to-rim compositional variations of garnet,clinopyroxene and orthopyroxene demonstrate that these minerals underwent variable degrees of subsolidus breakdown or partial *** DROs and CMPs consist of similar mineral assemblages and are characterized by high TiO,CaO + NaO and low MgO contents;they arc enriched in LREE and LILE compositions,have positive anomalies in Pb,Sr and particularly Ti,negative Th and U,and variable Zr and Hf *** chemical features are distinct and reflect reactions involving the ortho-pyroxenes. Compared to the CMPs,the OMPs,which are composed of a complex assemblage of minerals,display lower FeO and MgO contents,larger ranges in SiO and NaO, higher TiO,A1O,CaO and trace element concentrations, slightly negative Zr and Hf anomalies,and apparently negative Ti *** calculations of partial fusion of ortho-pyroxenes and clinopyroxenes suggest that the CMPs most likely originated from the breakdown of orthopyroxenes with variably minor contribution of external melts from the melting of clinopyroxenes,whereas the OMPs were probably formed from the modification of the CMPs through the interaction with large amount of external melts.

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Extremely high Li and low δ7 Li signatures in the lithospheric mantle

Extremely high Li and low δ7 Li signatures in the lithosphe...

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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： ben-xun su Hong-Fu Zhang Etienne Deloule Patrick Asamoah Sakyi Yan Xiao Yan-Jie Tang Yan Hu Ji-Feng Ying Ping-Ping Liu State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Centre National de la Recherche Scientifique CRPGBP2054501 Vandoeuvre-Les-Nancy CedexFrance Department of Earth science University of GhanaP.O.Box LG 58Legon-AccraGhana Department of Earth sciences the University of Hong Kong

Geochemical behavior of lithium(Li) in mantle processes is generally explained by:(1) Li diffuses into minerals from melts,faster in clinopyroxene than in olivine,creating isotopically lighter-Li clinopyroxene and heavier-Li olivine;(2) Partitioning of Li changes with temperature,and as cooling proceeds Li diffuses into clinopyroxene from olivine,also resulting in low-δLi clinopyroxene and high-δLi olivine,similar to the result of process(1),Our results obtained from highly carbonatite-metasomatized peridotite xenoliths from the Western Qinling reveal that the minerals of these xenoliths contain extremely high Li in a range of 2-16 ppm for olivine,2-43 ppm for orthopyroxene,and up to 75 ppm for ***,olivines have much lower 6’Li(down to - 42‰) relative to co-existent *** observations provide important insights into the behavior of Li during mantle *** explanation is that the fractionation of Li strongly depends on the metasomatic *** melts,particularly Na-rich carbonatitic melts,which have high Li contents(-200 ppm) but mantle levelδLi(3-5‰),tend to effectively transfer Li into olivine and Li into pyroxene,while silicate melts behave on the *** might be the existence of a reservoir with a high Li content but lowδLi,like eclogite,in the mantle since the Li released into the overlying mantle wedge during *** study reveals the disLinctive behavior of Li between the carbonatite and silicate metasomatism in the mantle.

关键词： Li isotope Mantle peridotite xenolith Metasomatism Lithospheric mantle

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subduction-induced mantle heterogeneity beneath Eastern Tianshan and Beishan:Insights from Nd-Sr-Hf-0 isotopic mapping of Late Paleozoic mafic-ultramafic complexes

Subduction-induced mantle heterogeneity beneath Eastern Tian...

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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： ben-xun su Ke-Zhang Qin He sun Dong-Mei Tang Patrick Asamoah Sakyi Zhu-Yin Chu Ping-Ping Liu Qing-Hua Xiao Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth science University of GhanaP.O.Box LG 58Legon-AccraGhana Department of Earth sciences the University of Hong Kong

Extensive late Paleozoic mafic-ultramafic complexes in the Eastern Tianshan and Beishan regions in the southern Central Asian Orogenic Belt(CAOB) represent an ideal opportunity to assess the characteristics of the mantle in this ***-rock Nd-Sr and zircon Hf-O isotopic data from the mafic-ultramafic complexes of the Jueluotage Belt,Middle Tianshan Massif and Beishan Rift were compiled for isotopic mapping.ε(t) and(Sr/Sr) values range from +5.5 to +9.5 and 0.702 to 0.706 respectively in the Jueluotage Belt,and from- 2 to + 11 and 0.703 to 0.710 respectively in the Middle Tianshan and ***ε(t) andεO values are in the range of +6.0-+17.0 and 4.14‰-8.00‰respectively in the Jueluotage Belt,+1-+8 and 5.17‰-6.30‰respectively in the Middle Tianshan,and show large variations of -1- + 17 and 4‰-12‰respectively in the ***,the(Sr/Sr) ratios of mafic-ultramafic complexes increase from Lhe Jueluotage Belt and Beishan to the Middle Tianshan,while theε(t) values show an opposite trend and reflect a mixing character between depleted mantle and EM-Ⅱ***ε (t) andδO values exhibit an apparent southward decreasing and increasing trends respectively,from the Jueluotage Belt,through Middle Tianshan,to Beishan *** corresponding Hf model ages increase continuously from north to *** observations demonstrate that the mantle sources beneath the Eastern Tianshan and Beishan are compositionally heterogeneous,which presumably result from significant and variable degrees of subduction-related *** therefore suggest that the late Paleozoic subcontinental lithospheric mantle beneath the Jueluotage Belt was modified by slab-derived melts and fluids during the subduction of the Junggar Ocean,whereas the mantle beneath the Beishan Rift was influenced mainly by slab-derived fluids during the subduction of the South Tianshan *** unique similarities of the Middle Tianshan mafic-ultramafic complexes reflect a two-stage modification

关键词： Central Asian Orogenic Belt Mafic-ultramafic complex Mantle heterogeneity Md-Sr-Hf-O isotopes subduction

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