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Fluid inclusions in whiteschist in the ultrahigh-pressure metamorphic belt of Dabie Shan,China

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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Fluid inclusions in whiteschist in the ultrahigh-pressure metamorphic belt of Dabie Shan,China

Fluid inclusions in whiteschist in the ultrahigh-pressure me...

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中国科学院地质与地球物理研究所2002学术年会

作者： FAN Hongrui,LIU Jingbo,GUO Jinghui,YE Kai & CONG Bolin Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029,China

Hualiangting whiteschist in Dabie Shan ultrahigh-pressure eclogite complex is a specific Mg-Al-rich metamorphic *** protolith was a felsic dyke,which suffered replacement by high-pressure fluids during eclogite-facies *** on fluid inclusion results in whiteschist,primary high-pressure fluids are CO-bearing aqueous solutions,Those prove that there exists CO-HO fluid during ultrahigh-pressure *** HO inclusions were trapped during ultrahigh-pressure exhumation,whereas secondary HO 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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Cathodoluminescence Microscopy of Zircon in HP-and UHPMetamorphic Rocks: A Fundamental Technique for Assessing the Problem of Inclusions versus Pseudo-Inclusions

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Journal of Earth Science 2019年第6期30卷 1095-1107页

作者： Hans-Peter Schertl Andreas Hertwig Walter VMaresch Institute of Geology Mineralogy and GeophysicsRuhr-University BochumP-44780 BochumGermany College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Earth Planetaryand Space SciencesUniversity of CaliforniaLos AngelesCA 90095USA

This paper shows how a faulty approach to the study of mineral inclusions in zircon can lead to misleading interpretations of the geological *** present and discuss two well-documented *** grains separated from HP metamorphic jadeitite of the Rio San Juan Complex,Dominican Republic,and from UHP pyrope quartzite of the Dora Maira Massif,northern Italy,were studied using cathodoluminescence(CL)techniques,in combination with mineral inclusion and age *** general,zircon from both localities shows inherited magmatic core domains with oscillatory zoning and metamorphic *** magmatic cores of zircon from the jadeitite yield ages of 115–117 Ma and host jadeite and omphacite which are of metamorphic origin and formed at about 78 *** from lawsonite blueschist,representing the country rock of the jadeitite,contains domains with oscillatory zoning that are nearly identical in age to the zircon cores from the adjacent jadeitite,and also contains younger metamorphic minerals such as lawsonite,albite,phengite(Si3.68),chlorite,and *** observations were made on the magmatic cores of zircon from the pyrope *** are about 275 Ma in age and host pyrope,phengite(Si3.55),talc,and kyanite,all of which formed during UHP metamorphism at about 35 *** from the biotite-phengite-gneiss country rock(metagranite)shows oscillatory zoning and yields ages that are identical to those of the magmatic cores of zircon from pyrope quartzite,which thus reflect granitic intrusion *** country-rock zircon also encloses metamorphic minerals with ages of about 35 *** minerals are,for example,garnet and phengite,as well as a polymineralic assemblage of clinopyroxene+garnet+phengite+quartz,that point to formation at UHP metamorphic conditions around 40 kbar/750℃.Based on these examples we suggest an effective approach centered on key evidence from CL studies to show that magmatic domains of zircon may actually contain pseudo-inclusions whic

关键词： zircon cathodoluminescence inclusion pseudo-inclusion jadeitite pyrope-quarzite whiteschist

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