What happened in the Trans-North China Orogen in the period 2560-1850   Ma?

CORC > 北京大学 > 地球与空间科学学院

	What happened in the Trans-North China Orogen in the period 2560-1850 Ma?
	Zhao, Guochun ; Liu Shuwen ; Sun, Min ; Li Sanzhong ; Wilde, Simon ; Xia, Xiaoping ; Zhang, Jian ; He, Yanhong
刊名	acta geologica sinica english edition
	2006
关键词	Archean Paleoproterozoic subduction collision Trans-North China Orogen North China Craton HIGH-PRESSURE GRANULITES PB ZIRCON GEOCHRONOLOGY PALEOPROTEROZOIC TECTONIC EVOLUTION EASTERN HEBEI PROVINCE LOWER CRUSTAL SECTION SINO-KOREAN CRATON ND ISOCHRON AGE U-PB CENTRAL ZONE FUPING COMPLEX
英文摘要	The Trans-North China Orogen (TNCO) was a Paleoproterozic continent-continent collisional belt along which the Eastern and Western Blocks amalgamated to form a coherent North China Craton (NCC). Recent geological, structural, geochemical and isotopic data show that the orogen was a continental margin or Japan-type are along the western margin of the Eastern Block, which was separated from the Western Block by an old ocean, with eastward-directed subduction of the oceanic lithosphere beneath the western margin of the Eastern Block. At 2550-2520 Ma, the deep subduction caused partial melting of the medium-lower crust, producing copious granitoid magma that was intruded into the upper levels of the crust to form granitoid plutons in the low- to medium-grade granite-greenstone terranes. At 2530-2520 Ma, subduction of the oceanic lithosphere caused partial melting of the mantle wedge, which led to underplating of mafic magma in the lower crust and widespread mafic and minor felsic volcanism in the arc, forming part of the greenstone assemblages. Extension driven by widespread mafic to felsic volcanism led to the development of back-arc and/or intra-arc basins in the orogen. At 2520-2475 Ma, the subduction caused further partial melting of the lower crust to form large amounts of tonalitic-trondhjemitic-granodioritic (TTG) magmatism. At this time following further extension of back-arc basins, episodic granitoid magmatism occurred, resulting in the emplacement of 2360 Ma, similar to 2250 Ma 2110-21760 Ma and similar to 2050 Ma granites in the orogen. Contemporary volcano-sedimentary rocks developed in the back-arc or intra-arc basins. At 2150-1920 Ma, the orogen underwent several extensional events, possibly due to subduction of an oceanic ridge, leading to emplacement of mafic dykes that were subsequently metamorphosed to amphibolites and medium- to high-pressure mafic granulites. At 1880-1820 Ma, the ocean between the Eastern and Western Blocks was completely consumed by subduction, and the closing of the ocean led to the continent-arc-continent collision, which caused large-scale thrusting and isoclinal folds and transported some of the rocks into the lower crustal levels or upper mantle to form granulites or eclogites. Peak metamorphism was followed by exhumation/uplift, resulting in widespread development of asymmetric folds and symplectic textures in the rocks.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000243309100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); 30; REVIEW; 6; 790-806; 80
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/251187]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhao, Guochun,Liu Shuwen,Sun, Min,et al. What happened in the Trans-North China Orogen in the period 2560-1850 Ma?[J]. acta geologica sinica english edition,2006.
APA	Zhao, Guochun.,Liu Shuwen.,Sun, Min.,Li Sanzhong.,Wilde, Simon.,...&He, Yanhong.(2006).What happened in the Trans-North China Orogen in the period 2560-1850 Ma?.acta geologica sinica english edition.
MLA	Zhao, Guochun,et al."What happened in the Trans-North China Orogen in the period 2560-1850 Ma?".acta geologica sinica english edition (2006).