evolution of the Gongshan block in the northern Indochina continent—An eastern extension of the Lha.pdf

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evolution of the Gongshan block in the northern Indochina continent—An eastern extension of the Lha.pdf

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evolution of the Gongshan block in the northern Indochina continent—An eastern extension of the Lha

Lithos 120 (2010) 327–346 Contents lists available at ScienceDirect Lithos j ourna l homepage: www.e lsev ie / locate / l i thosMetamorphism, anatexis, zircon ages and tectonic evolution of the Gongshan block in the northern Indochina continent—An eastern extension of the Lhasa Block Shuguang Song a,b,?, Yaoling Niu b, Chunjing Wei a, Jianqing Ji a, Li Su c a MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China b Department of Earth Sciences, Durham University, Durham DH1 3LE, UK c Geological Lab Center, Chinese University of Geosciences, Beijing 100083, China? Correspondent author. MOE Key Laboratory of Evolution, School of Earth and Space Sciences, Pekin China. Tel.: +86 10 fax: +86 10 E-mail address: sgsong@ (S. Song). 0024-4937/$ – see front matter ? 2010 Elsevier B.V. Al doi:10.1016/j.lithos.2010.08.021a b s t r a c ta r t i c l e i n f oArticle history: Received 9 October 2009 Accepted 17 August 2010 Available online 18 September 2010 Keywords: Metamorphism and anatexis Zircon dating Crust thickening Northern Indochina continent Eastern Himalayan Syntaxis Lhasa Block Southern TibetThe Gongshan block near the Eastern Himalayan Syntaxis is a fault-bounded block at the northern tip of the triangle-shaped Indochina continent (NIC). Exposed in this block are late Paleozoic (Carboniferous to Permian) strata and a north–south belt of intermediate to felsic batholiths (i.e., Gaoligongshan magmatic belt). The contact between the Gaoligongshan batholiths and Carboniferous/Permian strata is characterized by a series of high-grade metamorphic gneisses with leucosome granite veins (i.e., the so-called “Gaoligong Group”). U-Pb SHRIMP and LA-ICP-MS dating of zircons indicate that these gneisses are actually metamorphosed Paleogene sediments containing inherited Archean to Cretaceous detrital zircons (from 2690 to 64 Ma) and have undergone medium- to high-pressure granulite