气候变化领域集成服务门户(CCPortal): Metamorphic and geochronological evolution of Paleoproterozoic high-pressure ultra-high-temperature pelitic granulite, Chicheng, northern Trans-North China Orogen

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DOI	10.1016/j.precamres.2021.106237
	Metamorphic and geochronological evolution of Paleoproterozoic high-pressure ultra-high-temperature pelitic granulite, Chicheng, northern Trans-North China Orogen
	Zhang, Dingding; O'Brien, Patrick J.; Schertl, Hans-Peter; Ma, Xudong; Tian, Zhonghua; Zhao, Lei; Guo, Jinghui
通讯作者	Zhang, DD (通讯作者)
发表日期	2021
ISSN	0301-9268
EISSN	1872-7433
卷号	361
英文摘要	Three half-meter-wide pelitic granulite interlayers are found within mafic, intermediate, and felsic granulites in Chicheng of the Trans-North China Orogen, they help to understand the assembly of the Eastern and Western blocks of the the North China Craton (NCC). Detailed petrological study shows that all have identical highpressure mineral assemblages of garnet + kyanite + K-feldspar + plagioclase + quartz + rutile. Inclusions of mesoperthite in garnet indicate the former presence of ternary feldspar at peak conditions, which, in the matrix, have recrystallized. Kyanite is commonly surrounded by a narrow corona or chain of small garnets, enveloped by a zone of plagioclase and an outermost rim of potassium feldspar. Phase equilibria modeling using THERMO-CALC yiels a peak metamorphic pressure of 1.6 GPa at 880 degrees C (M2a) and a peak temperature of 950 degrees C at 1.5 GPa (M2b). The ternary feldspar thermometer also indicates a peak temperature of 900-950 degrees C. The pelitic and mafic granulites exhibit the same peak metamorphic pressure, while the pelitic granulites show a 150 degrees C higher peak metamorphic temperature than the interlayered mafic granulites of 750-790 degrees C. Absence of sillimanite in the Chicheng pelitic granulite and orthopyroxene in the mafic granulite indicates a fast exhumation process of cooling, which is different from other high pressure rocks from the Trans-North China Orogen. Analysis of metamorphic monazite and zircon yields concordant SIMS U-Pb ages of ca. 1.91 Ga. This study suggests that the Chicheng HP granulite terrane was subjected to fast tectonic exhumation after the collision that occurred at ca. 1.91 Ga. The results provide a reliable metamorphic record for the final collisiion of the Paleoproterozoic TransNorth China Orogen in the NCC.
关键词	PB ZIRCON GEOCHRONOLOGY SANGGAN AREA T PATHS HENGSHAN COMPLEX CRATON ZONE CONSTRAINTS EQUILIBRIA EXAMPLES INSIGHTS
英文关键词	Metapelite; Metamorphism; High-pressure-ultra-high-temperature granulite; Paleoproterozoic; Trans-North China Orogen; Zircon and monazite dating
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000663340100003
来源期刊	PRECAMBRIAN RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260492
推荐引用方式 GB/T 7714	Zhang, Dingding,O'Brien, Patrick J.,Schertl, Hans-Peter,et al. Metamorphic and geochronological evolution of Paleoproterozoic high-pressure ultra-high-temperature pelitic granulite, Chicheng, northern Trans-North China Orogen[J]. 中国科学院青藏高原研究所,2021,361.
APA	Zhang, Dingding.,O'Brien, Patrick J..,Schertl, Hans-Peter.,Ma, Xudong.,Tian, Zhonghua.,...&Guo, Jinghui.(2021).Metamorphic and geochronological evolution of Paleoproterozoic high-pressure ultra-high-temperature pelitic granulite, Chicheng, northern Trans-North China Orogen.PRECAMBRIAN RESEARCH,361.
MLA	Zhang, Dingding,et al."Metamorphic and geochronological evolution of Paleoproterozoic high-pressure ultra-high-temperature pelitic granulite, Chicheng, northern Trans-North China Orogen".PRECAMBRIAN RESEARCH 361(2021).