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Metamorphic zircon from Xindian eclogite,Dabie Terrain: U-Pb age and oxygen isotope composition

Science China Earth Sciences 2006年第1期49卷 68-76页

作者： E. Deloule CRPG-CNRS Nancy 54501France

Detailed CL image, U-Pb age and oxygen isotope composition in situ analyses for two metamorphic zircons from ultra-high pressure Xindian eclogite, Southern Dabie Terrain were carried out. There are two kinds of zircon in eclogite. The major subpopulation is podgy and isometric, and interpreted as protolith magmatic zircon with partial recrystallization. Its formation age is 811 ±22 Ma. The less abundant one is euhedral prismatic with core-rim structure and the rim being metamorphic overgrowth and formed at 221±17 Ma. Zircon CL image strength is mainly controlled by U and Th contents. The magmatic zircon has its Th/U ratio around 1.3 and decreasing with recrystallization, whereas metamorphic zircon has Th/U ratio of lower than 0.1. Magmatic and metamorphic zircon domains all show very low oxygen isotopic compositions with average δ18O values of 1.8?and 2.8? respectively. The low δ18O values in protolith zircon indicated meteoric water involvement in their magma source region. It may correlate with snowball earth event during Neoproterozoic. It also indicates that protolith zircon could survive its oxygen isotope signature during Dabie eclogite facies UHP metamorphism.

关键词： metamorphic zircon, zircon U-Pb age, zircon oxygen isotopes, eclogite, Dabie shan.

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Fluid inclusions in whiteschist in the ultrahigh-pressure metamorphic belt of Dabie shan.China

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Chinese Science Bulletin 2002年第12期47卷 1028-1032页

作者： Hongrui Fan Jingbo Liu Jinghui Guo Kai Ye Bolin Cong Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China

Hualiangting whiteschist in the Dabie shan.ultrahigh-pressure eclogite complex is a specific Mg-Al-rich metamorphic rock. Its protolith was a felsic dyke, which suffered replacement by high-pressure fluids during ec-logite-facies metamorphism. Based on fluid inclusion results in whiteschist, primary high-pressure fluids are CO2-bearing aqueous solutions. Those prove that there exists CO2-H2O fluid during the ultrahigh-pressure metamorphism. Pseu-dosecondary H2O inclusions were trapped during ultra-high-pressure exhumation, whereas secondary H2O inclusions were related to the latest evolutionary stage of the ultrahigh-pressure exhumation.

关键词： fluid inclusion whiteschist ultrahigh-pressure Dabie shan.

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