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Ca-rich Garnet-Clinopyroxene Rocks at Hujialin in the su-lu terrane(Eastern China):Deeply subducted Arc Cumulates?

Ca-rich Garnet-Clinopyroxene Rocks at Hujialin in the Su-Lu ...

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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： Jian-Jun Yang~(1,2) 1 State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beitucheng Xilu 19,P.O.Box 9825,Beijing 100029,China 2 The Key Laboratory of Continental dynamics.Department of Geology,Northwest University,Xi’an 710069, China

Layers of Ca-rich garnet-clinopyroxene rocks enclosed in a serpentinite body at Hujialin,in the su-lu terrane of eastern China,preserve igneous textures,relict spinel in garnet, and exsolution lamellae of Ca-rich garnet,ilmenite/magnetite,Fe-rich spinel,and also amphibole in *** terms of their major and trace element compositions,the studied samples form a trend from arc cumulates towards Fe-Ti *** augite compositions plot on the trend for clinopyroxene in arc *** data suggest that the rocks crystallised from mantle-derived magmas differentiated to various extents beneath an *** Ca-rich garnet + diopside assemblage is inferred to have formed by compressing Ca-rich augite,whereas the relatively Mg-rich cores of garnet porphyroblasts may have formed at the expense of *** protolith cumulates were subducted from near the crust-mantle boundary(c.1 GPa) deep into the upper mantle(4.8±0.6 GPa and 750±50℃).Negatively sloped PT paths for the garnet-clinopyroxene rocks and the corollary of corner flow induced subduction of mantle wedge peridotite are not supported by the available *** with,or without,decompression of the cumulates after the igneous stage likely occurred prior to deep subduction.

关键词： arc cumulates Ca-rich garnet garnet-clinopyroxene rocks su-lu terrane UHP metamorphism

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Titanian clinohumite-gamet-pyroxene rock from the su-lu UHP metamorphic terrane,China:chemical evolution and tectonic implications

Titanian clinohumite-gamet-pyroxene rock from the Su-Lu UHP ...

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中国科学院地质与地球物理研究所2003学术年会

作者： Jian-Jun Yang~* LTE Laboratory,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9823,Beijing 100029,China The Key Laboratory of Continental Dynamics,Department of Geology,Northwest Uniyersity,Xi’an 710069,China

A garnet-pyroxene rock containing abundant Ti-clinohumite(ca.40 vol.%) occurs along with eclogites as small blocks in quanzo-feldsparthic gneiss in the southern end of the Chinese su-lu ultrahigh-pressure(LHP) metamorphic *** consists of three aggregates:(1) Ti-clinohumite-dominated aggregate with interstitial garnet and pyroxene.(2) garnet-pyroxene aggregate with Ti-clinohumite ***(3) Ti-clinohumite-free aggregate dominated by ***,phlogopite, zircon,hematite,*** an unknown Ni-Fe-volatile-Si(NFVS) mineral,which is replaced by Ni-greenalite,occur as *** is the major secondary ***(PrpAlmGrsuvaSps) in all three aggregates is pyrope-rich with very low grossular component,with that in the aggregate(2) most enriched in Cr(CrO = 2.55 wt.%).Orthopyroxene is depleted in Al(AlO = 0.16 wt.%in the cores) and Ca(CaO = 0.06-0.09 wt.%in the cores),with X(Mg/(Mg + Fe)) values at *** is chromian diopside with Fe≥*** clinopyroxene has a lower X(0.862) than that(0.887) included in *** rock contains modest amount of heavy rare earth elements (HREE)(10 to 12×C1 chondrite),with significant enrichment in Cr,Co,Ni,V,Sr,and light rare earth elements(LREE)(22 to 33×C1 chondrite).The clinopyroxene is very enriched in Cr(CrO is up to 2.09 wt.%in the cores) and Sr(ca.350 ppm) and LREE(Ce/Yb= 157.7).Ti-clinohumite is enriched in Ni(1981 ppm),Co(123 ppm),and Nb(85 ppm). While it is possible to enrich ultramafites in incompatible elements in a subducted slab,the high Al,Fe,Ti,and low Si,Ca, and Na contents in the Ti-clinohumite rock are difficult to account for by crustal metasomatism of an *** the other hand,the similarity in major and trace element compositions and their systematic variations between the Ti-clinohumite-garnet-pyroxene rock of this study and those of Mg-metasomatised Fe-Ti gabbros reported in the literature suggest that crustal metasomatism occurred in a gabbr

关键词： Titanian clinohumite Garnet-pyroxene rock Metagabbro Metasomatism Ultrahigh-pressure su-lu terrane

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