Differential exhumation of tectonic units and ultrahigh-pressure;metamorphic rocks in the Dabie mountains, China

doi:10.1046/j.1440-1738.1998.00183.x

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院地质力学研究所

	Differential exhumation of tectonic units and ultrahigh-pressure;metamorphic rocks in the Dabie mountains, China
	Dong, SW 4; Chen, JF ; Huang, DZ
刊名	ISLAND ARC
	1998
卷号	7 期号:1-2 页码:174-183
关键词	China Dabie Mountains exhumation of UHP metamorphic rocks opposite wedging
ISSN号	1038-4871
DOI	10.1046/j.1440-1738.1998.00183.x
英文摘要	A model involving buoyancy, wedging and thermal doming is postulated to explain the differential exhumation of ultrahigh-pressure (UHP) metamorphic rocks in the Dabie Mountains, China, with an emphasis on the exhumation of the UHP rocks from the base of the crust to the upper dust by opposite wedging of the North China Block (NCB). The Yangtze Block was subducted northward under the NCB and Northern Dabie microblock, forming UHP metamorphic rocks in the Triassic (240-220 Ma). After delamination of the subduction wedge, the UHP rocks were exhumed rapidly to the base of the crust by buoyancy (220-200 Ma). Subsequently, when the left-lateral Tan-Lu transform fault began to be activated, continuous north-south compression and uplifting of the orogen forced the NCB to be subducted southward under the Dabie Orogen ('opposite subduction'). Opposite subduction and wedging of the North China continental crust is responsible for the rapid exhumation of the UHP and South Dabie Block units during the Early Jurassic, at ca 200-160 Ma at a rate of similar to 3.0 mm/year. The UHP eclogite suffered retrograde metamorphism to greenschist facies. Rapid exhumation of the North Dabie Block (NDB) occurred during 135-120 Ma because of thermal doming and granitoid formation during extension of continental margin of the Eurasia. Amphibolite facies rocks from NDB suffered retrograde metamorphism to greenschist facies. Different unit(s) and terrane(s) were welded together by granites and the wedging ceased. Since 120-110 Ma, slow uplift of the entire Dabie terrane is caused by gravitational equilibrium.
学科主题	变质岩岩石学
WOS关键词	COESITE-BEARING ECLOGITES ; YANGTZE CRATONS ; SM-ND ; COLLISION ; GEOCHRONOLOGY ; COMPLEX ; OROGEN ; NORTH
WOS研究方向	Geology
语种	英语
出版者	BLACKWELL SCIENCE
WOS记录号	WOS:000074434600012
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37286]
专题	中国地质科学院地质力学研究所
作者单位	1.Chinese Acad Geol Sci, Nanjing Inst Geol & Mineral Resources, Nanjing 210016, Peoples R China. 2.Univ Sci & Technol China, Dept Earth & Space Sci, 3rd World Acad Sci Hefei, Adv Ctr Earth Sci & Astron, Hefei 230026, Peoples R China. 3.Anhui Inst Geol, Hefei 230001, Peoples R China. 4.中国地质调查局南京地质调查中心
推荐引用方式 GB/T 7714	Dong, SW,Chen, JF,Huang, DZ. Differential exhumation of tectonic units and ultrahigh-pressure;metamorphic rocks in the Dabie mountains, China[J]. ISLAND ARC,1998,7(1-2):174-183.
APA	Dong, SW,Chen, JF,&Huang, DZ.(1998).Differential exhumation of tectonic units and ultrahigh-pressure;metamorphic rocks in the Dabie mountains, China.ISLAND ARC,7(1-2),174-183.
MLA	Dong, SW,et al."Differential exhumation of tectonic units and ultrahigh-pressure;metamorphic rocks in the Dabie mountains, China".ISLAND ARC 7.1-2(1998):174-183.