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《2004年全国岩石学与地球动力学研讨会论文摘要集》2004年
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Fluid inclusions hidden in coesite-bearing zircons from ultrahigh-pressure metamorphic rocks in southwestern Sulu terrane, eastern China

【摘要】:正 Primary fluid inclusions, together with coesite mineral inclusions, are identified in the same zircon domains by Laser Raman spectroscopy, cathodoluminescence (CL) image and micro-texture analysis in paragneiss and retrogressive eclogite from the main drilling hole of Chinese Continental Scientific Drilling Project, southwestem Sulu terrane. Most fluid inclusions are characterized by CO_2 (gas) - H_2O (liquid) two-phase; a few by H_2O one-phase liquid inclusions. These features indicate that the eclogite and its country-rocks may not be located in the "dry system", but in the "Wet system" circumstance, when the Sulu terrane occurred ultrahigh-pressure metamorphism. The SHRIMP U-Pb dating suggests that the time for fluid and coesite inclusions trapped in metamorphic recrystallized zircon domains is about 230-236 Ma (the weighted mean = 233.7±4.3 Ma); this age is in agreement with many reported Triassic UHP metamorphic ages of 230-245 Ma from eclogites and gneissic rocks in Sulu-Dabie terrane. This research not only shows important significance for an in-depth study of the fluid property and evolutional feature, and fluid-rock interaction mechanism in Sulu-Dabie UHP terrane, but also provides a new method for exactly identifying the primary fluid inclusions preserved in zircons from the ultrahigh-pressure metamorphic rocks in the world.
【分类号】:P588.3

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