METAMORPHISM OF THE LULIANG AMPHIBOLITE: IMPLICATIONS FOR THE TECTONIC EVOLUTION OF THE NORTH CHINA CRATON

doi:10.2475/10.2010.10

	METAMORPHISM OF THE LULIANG AMPHIBOLITE: IMPLICATIONS FOR THE TECTONIC EVOLUTION OF THE NORTH CHINA CRATON
	Zhao, Guochun 1; Yin, Changqing 1; Guo, Jinghui 2; Sun, Min 1; Li, Sanzhong 3; Li, Xuping 4; Wu, Chunming 5; Liu, Chaohui 1
刊名	AMERICAN JOURNAL OF SCIENCE
	2010-12-01
卷号	310 期号:10 页码:1480-1502
关键词	Metamorphism Continent-continent Collision Paleoproterozoic Amphibolite Trans-north China Orogen North China Craton
ISSN号	0002-9599
DOI	10.2475/10.2010.10
文献子类	Article
英文摘要	The Luliang Complex is located in the southern sector of the Trans-North China Orogen, a continent-continent collisional belt along which the discrete Archean Eastern and Western blocks amalgamated to form the basement of the North China Craton. The complex consists of Paleoproterozoic supracrustal rocks and granitoid plutons of which the former include amphibolites and pelitic schists/gneisses. Petrological evidence from the Luliang amphibolites indicates three distinct metamorphic mineral assemblages. The early inclusion assemblage (M(1)) is composed of hornblende + plagioclase + quartz + ilmenite, preserved as mineral inclusions within garnet porphyroblasts. The THERMOCALC program yielded maximum P-T conditions of 7.1 to 6.1 kbar and 668 to 655 degrees C for the M, assemblage, based on the core compositions of garnet porphyroblasts and inclusion-type hornblende and plagioclase. The peak porphyroblast-matrix assemblage (M(2)) is garnet + hornblende + plagioclase + clinopyroxene +/- quartz +/- rutile, representing the growth of garnet porphyroblasts and matrix minerals. The P-T conditions of the M2 assemblage were estimated at 9.2 to 8.3 kbar and 753 to 748 degrees C, based on the rim compositions of garnet porphyroblasts and matrix plagioclase, hornblende and clinopyroxene. The post-peak symplectite assemblage (M(3)) is represented by cummingtonite + plagioclase symplectite surrounding embayed garnet grains, with the maximum P-T conditions of 5.1 to 4.1 kbar and 737 to 697 degrees C, based on the rim compositions of garnet and symplectic cummingtonite and plagioclase. A combination of petrographic textures, reaction relations, mineral compositions and P-T data define a clockwise P-T path involving near-isothermal decompression for the Luliang amphibolites. This suggests that like those metamorphic complexes in the northern part of the Trans-North China Orogen, the Luliang Complex in the central part of the orogen also underwent initial crustal thickening (M(1) and M(2)), followed by erosional and/or extensional exhumation (M(3)), which is in accordance with collision between the Eastern and Western Blocks to form the coherent basement of the North China Craton at similar to 1.85 Ga.
WOS关键词	PB ZIRCON GEOCHRONOLOGY ; HIGH-PRESSURE GRANULITES ; LIAO-JI BELT ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; U-PB ; EASTERN BLOCK ; DETRITAL ZIRCONS ; SANGGAN AREA ; CENTRAL ZONE ; PALEOPROTEROZOIC EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	AMER JOURNAL SCIENCE
WOS记录号	WOS:000290550800011
资助机构	Chinese National 973 Program(2007CB411307) ; Chinese National 973 Program(2007CB411307) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Hong Kong RGC(7066/07P ; Hong Kong RGC(7066/07P ; HKU ; HKU ; 40872123 ; 40872123 ; 7063/06P ; 7063/06P ; 40872122) ; 40872122) ; 7053/08P) ; 7053/08P) ; Chinese National 973 Program(2007CB411307) ; Chinese National 973 Program(2007CB411307) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Hong Kong RGC(7066/07P ; Hong Kong RGC(7066/07P ; HKU ; HKU ; 40872123 ; 40872123 ; 7063/06P ; 7063/06P ; 40872122) ; 40872122) ; 7053/08P) ; 7053/08P) ; Chinese National 973 Program(2007CB411307) ; Chinese National 973 Program(2007CB411307) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Hong Kong RGC(7066/07P ; Hong Kong RGC(7066/07P ; HKU ; HKU ; 40872123 ; 40872123 ; 7063/06P ; 7063/06P ; 40872122) ; 40872122) ; 7053/08P) ; 7053/08P) ; Chinese National 973 Program(2007CB411307) ; Chinese National 973 Program(2007CB411307) ; Chinese NSFC(40730315 ; Chinese NSFC(40730315 ; Hong Kong RGC(7066/07P ; Hong Kong RGC(7066/07P ; HKU ; HKU ; 40872123 ; 40872123 ; 7063/06P ; 7063/06P ; 40872122) ; 40872122) ; 7053/08P) ; 7053/08P)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/73360]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhao, Guochun
作者单位	1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Ocean Univ China, Coll Marine Geosci, Qingdao 266003, Peoples R China 4.Shandong Univ Sci & Technol, Coll Geoinformat Sci & Engn, Qingdao 266510, Peoples R China 5.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Guochun,Yin, Changqing,Guo, Jinghui,et al. METAMORPHISM OF THE LULIANG AMPHIBOLITE: IMPLICATIONS FOR THE TECTONIC EVOLUTION OF THE NORTH CHINA CRATON[J]. AMERICAN JOURNAL OF SCIENCE,2010,310(10):1480-1502.
APA	Zhao, Guochun.,Yin, Changqing.,Guo, Jinghui.,Sun, Min.,Li, Sanzhong.,...&Liu, Chaohui.(2010).METAMORPHISM OF THE LULIANG AMPHIBOLITE: IMPLICATIONS FOR THE TECTONIC EVOLUTION OF THE NORTH CHINA CRATON.AMERICAN JOURNAL OF SCIENCE,310(10),1480-1502.
MLA	Zhao, Guochun,et al."METAMORPHISM OF THE LULIANG AMPHIBOLITE: IMPLICATIONS FOR THE TECTONIC EVOLUTION OF THE NORTH CHINA CRATON".AMERICAN JOURNAL OF SCIENCE 310.10(2010):1480-1502.