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An analysis of mineralogical characteristics and metamorphism of Paleoproterozoic pelitic granulites from Datong-Huai' an area, the North China Craton
Wu JiaLin1; Zhai MingGuo2,3; Zhang HuaFeng4; Hu Bo1
2018
发表期刊ACTA PETROLOGICA SINICA
ISSN1000-0569
卷号34期号:11页码:3266-3286
摘要It was suggested that Paleoproterozoic pelitic granulites from the northern-central North China Craton were metamorphosed under low- to intermediate-pressure granulite-facies conditions in early studies. However, our recent studies identified that the pelitic granulites from Datong-Huai' an area had suffered high-pressure-high-temperature granulitie-facies metamorphism. It was comparable to P-T evolution of the spatially associated garnet mafic granulites in the study area. However, the early metamorphic assemblages were intensively and extensively overprinted by following intermediate-pressure sillimanite-bearing granulitie-facies metamorphism. Here, we presented mineralogical and petrological studies of the pelitic granulites from Datong-Huai' an area in detail. Based on the fine mineral inclusions, microstructures and mineral chemistry studies, four metamorphic generation assemblages were divided : prograde ( M-1 ) , pressure-peak ( M-2 ) , temperature-peak ( M-3 ) and cooling stage ( M-4 ). M-1 was characterized by mineral inclusions in garnet core, including a large amount of quartz, minor biotite, rutile and neglectable muscovite. M-2 was featured by a few mineral inclusions within garnet mantle, consisting of kyanite, K-feldspar, rutile, biotite, quartz and zinc spinet, sometimes phengite also appeared. M-3 was comprised of minerals in matrix and mineral inclusions in garnet rim, including garnet, sillimanite, K-feldspar, quartz, ilmenite, with or without rutile, biotite and zinc spinet. M-4 was characterized by retrograde minerals around porphyroblastic garnet. With a combination of mineralogical thermobarometry, Zr-in-rutile thermometry and pseudosection approaches, the metamorphic conditions of M-1 to M-4 were estimated around -10kbar/661 similar to 779 degrees C , 10 similar to 15kbar/810 similar to 860 degrees C , 6 similar to 10. 5kbar/850 similar to 925 degrees C and 5 similar to 8kbar/645 similar to 761 degrees C. Moreover, pesudosection approaches were not only used to model and interpret the microstructures and metamorphic reactions of the pelitic granulite ( Sample 13GS47 ) , but also to forward simulate the evolution of garnet composition. Furthermore, lots of decompression and/or cooling microstructures were also documented in other rocks adjacent to these pelitic granulites. Recently, lines of prograde petrologic evidence were also reported in some garnet mafic granulites, which support the conclusion that the pelitic granulites and associated garnet mafic granulites were possibly experienced similar metamorphic history, and they were probably juxtaposed together in lower continental crustal level before pressure-peak metamorphism ( ca. 1. 97 similar to 1. 90Ga) during Paleoproterozoic orogeny.
关键词Pelitic granulite Mineralogical feature Metamorphism Datong-Huai' an North China Craton
关键词[WOS]ZIRCON U-PB ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; HIGH-PRESSURE GRANULITE ; T-T EVOLUTION ; KHONDALITE BELT ; PHASE-EQUILIBRIA ; WESTERN BLOCK ; FACIES METAMORPHISM ; INNER-MONGOLIA ; COMPLEX CONSTRAINS
语种英语
WOS研究方向Geology
WOS类目Geology
WOS记录号WOS:000456929100012
出版者SCIENCE PRESS
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90191
专题岩石圈演化国家重点实验室
通讯作者Wu JiaLin
作者单位1.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
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Wu JiaLin,Zhai MingGuo,Zhang HuaFeng,et al. An analysis of mineralogical characteristics and metamorphism of Paleoproterozoic pelitic granulites from Datong-Huai' an area, the North China Craton[J]. ACTA PETROLOGICA SINICA,2018,34(11):3266-3286.
APA Wu JiaLin,Zhai MingGuo,Zhang HuaFeng,&Hu Bo.(2018).An analysis of mineralogical characteristics and metamorphism of Paleoproterozoic pelitic granulites from Datong-Huai' an area, the North China Craton.ACTA PETROLOGICA SINICA,34(11),3266-3286.
MLA Wu JiaLin,et al."An analysis of mineralogical characteristics and metamorphism of Paleoproterozoic pelitic granulites from Datong-Huai' an area, the North China Craton".ACTA PETROLOGICA SINICA 34.11(2018):3266-3286.
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