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Metamorphism and P-T evolution of high pressure granulite in Chicheng, northern part of the Paleoproterozoic Trans-North China Orogen

文献类型：期刊论文

作者Zhang, Dingding1,2; Guo, Jinghui1,2; Tian, Zhonghua3; Liu, Fu1
刊名PRECAMBRIAN RESEARCH
出版日期2016-07-01
卷号280页码:76-94
关键词High pressure granulite Metamorphism P-T evolution Paleoproterozoic Trans-North China Orogen
DOI10.1016/j.precamres.2016.04.009
文献子类Article
英文摘要It is widely accepted that the North China Craton (NCC) was finally formed by collision of the Eastern and the Western Blocks along the Trans-North China Orogen (TNCO) at approximately 1.85 Ga. The continent -continent collision along the TNCO was partly defined by metamorphism of high pressure mafic granulites with clockwise P-T paths. However, the continental subduction process has not been well recorded by previously reported HP granulites due to lack of prograde metamorphism and their plutonic protoliths. In this paper, we report HP mafic granulites among a metamorphic volcanic-sedimentary sequence south to Chicheng, northern part of the TNCO, in which the prograde metamorphism was well preserved. The prograde metamorphic stage (Ml) has been revealed by a distinct growth zone of garnet (Grt) porphyroblasts with an inclusion-rich core and inclusion-free mantle. The peak metamorphic mineral assemblage (M2) consists of Grt and clinopyroxene (Cpx) predominantly with minor plagioclase (PI), Rutile (Ru), hornblende (Hb) and quartz (Q). The P1 + Hb symplectite or corona surrounding garnet and Cpx + Ilm (ilmenite) symplectite surrounding sphene provide evidence for the post-peak decompression (M3) stage. Ubiquitous Hb especially along cracks represents further retrogression (M4) within amphibolite facies. Phase equilibria modeling by the THERMOCALC program combined with thermobarometric calculations yielded a consecutive hairpin shaped clockwise P-T path, which indicate that the HP granulites experienced remarkable prograde metamorphism, during which the temperatures increased from 630 degrees C to 740 degrees C while the pressures increased from 8 kbar to the barometric peak of 16 kbar. After the barometric peak, the HP granulites subjected to decompression from 16 kbar to 13 kbar while the temperature continued to increased from 750 degrees C to 790 degrees C, suggesting a thermal relaxation. After the thermal peak, the HP granulites began their consecutive decompression with cooling from 790 degrees C and 13 kbar to 700 degrees C and 7 kbar through 740 degrees C and 9 kbar, avoiding access to the orthopyroxene (Opx) stability field as experienced by many other HP granulites in the TNCO. The hairpin-shaped P-T path of the Chicheng HP granulites suggests a continuous continental subduction and tectonic uplift, providing a better metamorphic constraint on the final assembly of the NCC along the TNCO. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词LIAO-JI BELT ; U-PB ; TECTONIC EVOLUTION ; ZIRCON GEOCHRONOLOGY ; JIAOBEI MASSIF ; JINING COMPLEX ; WESTERN BLOCK ; EASTERN BLOCK ; PELITIC GRANULITES ; MAFIC GRANULITES
WOS研究方向Geology
语种英语
WOS记录号WOS:000378666700006
资助机构NSFC in China(41202137 ; NSFC in China(41202137 ; NSFC in China(41202137 ; NSFC in China(41202137 ; National Basic Research Program in China(2012CB416601) ; National Basic Research Program in China(2012CB416601) ; National Basic Research Program in China(2012CB416601) ; National Basic Research Program in China(2012CB416601) ; 91414301) ; 91414301) ; 91414301) ; 91414301) ; NSFC in China(41202137 ; NSFC in China(41202137 ; NSFC in China(41202137 ; NSFC in China(41202137 ; National Basic Research Program in China(2012CB416601) ; National Basic Research Program in China(2012CB416601) ; National Basic Research Program in China(2012CB416601) ; National Basic Research Program in China(2012CB416601) ; 91414301) ; 91414301) ; 91414301) ; 91414301)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53401]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Dingding,Guo, Jinghui,Tian, Zhonghua,et al. Metamorphism and P-T evolution of high pressure granulite in Chicheng, northern part of the Paleoproterozoic Trans-North China Orogen[J]. PRECAMBRIAN RESEARCH,2016,280:76-94.
APA Zhang, Dingding,Guo, Jinghui,Tian, Zhonghua,&Liu, Fu.(2016).Metamorphism and P-T evolution of high pressure granulite in Chicheng, northern part of the Paleoproterozoic Trans-North China Orogen.PRECAMBRIAN RESEARCH,280,76-94.
MLA Zhang, Dingding,et al."Metamorphism and P-T evolution of high pressure granulite in Chicheng, northern part of the Paleoproterozoic Trans-North China Orogen".PRECAMBRIAN RESEARCH 280(2016):76-94.

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来源：地质与地球物理研究所

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