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

TitleWhat happened in the Trans-North China Orogen in the period 2560-1850 Ma?
Authors
KeywordsArchean
Paleoproterozoic
Subduction
Collision
Trans-North China Orogen
North China Craton
Issue Date2006
PublisherZhongguo Dizhi Xuehui. The Journal's web site is located at http://dzxb-e.periodicals.net.cn/
Citation
Acta Geologica Sinica, 2006, v. 80 n. 6, p. 790-806 How to Cite?
AbstractThe 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 arc 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, ~2250 Ma 2110–21760 Ma and ~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.
Persistent Identifierhttp://hdl.handle.net/10722/72843
ISSN
2015 Impact Factor: 1.996

 

DC FieldValueLanguage
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorLiu, Sen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLi, Sen_HK
dc.contributor.authorWilde, Sen_HK
dc.contributor.authorXia, Xen_HK
dc.contributor.authorZhang, Jen_HK
dc.contributor.authorHe, Yen_HK
dc.date.accessioned2010-09-06T06:45:37Z-
dc.date.available2010-09-06T06:45:37Z-
dc.date.issued2006en_HK
dc.identifier.citationActa Geologica Sinica, 2006, v. 80 n. 6, p. 790-806en_HK
dc.identifier.issn1000-9515en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72843-
dc.description.abstractThe 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 arc 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, ~2250 Ma 2110–21760 Ma and ~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.-
dc.languageengen_HK
dc.publisherZhongguo Dizhi Xuehui. The Journal's web site is located at http://dzxb-e.periodicals.net.cn/en_HK
dc.relation.ispartofActa Geologica Sinicaen_HK
dc.subjectArchean-
dc.subjectPaleoproterozoic-
dc.subjectSubduction-
dc.subjectCollision-
dc.subjectTrans-North China Orogen-
dc.subjectNorth China Craton-
dc.titleWhat happened in the Trans-North China Orogen in the period 2560-1850 Ma?en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1000-9515&volume=80&spage=790&epage=806&date=2006&atitle=What+happened+in+the+Trans-North+China+Orogen+in+the+period+2560-1850+Ma?en_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailXia, X: xpxia@hkusua.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.hkuros127553en_HK
dc.identifier.volume80-
dc.identifier.issue6-
dc.identifier.spage790-
dc.identifier.epage806-
dc.customcontrol.immutablesml 130319-

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