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Post-collisional crustal extension setting and VHMS mineralization in the Jinshajiang orogenic belt, southwestern China

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Zengqian, H and Liquan, W and Zaw, K and Xuanxue, M and Mingjie, W and Dingmou, L and Guitang, P (2003) Post-collisional crustal extension setting and VHMS mineralization in the Jinshajiang orogenic belt, southwestern China. Ore Geology Reviews, 22 (3-4). pp. 177-199. ISSN 0169-1368

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Abstract

The Jinshajiang orogenic belt (JOB) of southwestern China, located along the eastern margin of the Himalayan–Tibetan orogen, includes a collage of continental blocks joined by Paleozoic ophiolitic sutures and Permian volcanic arcs. Three major tectonic stages are recognized based on the volcanic–sedimentary sequence and geochemistry of volcanic rocks in the belt. Westward subduction of the Paleozoic Jinshajiang oceanic plate at the end of Permian resulted in the formation of the Chubarong–Dongzhulin intra-oceanic arc and Jamda–Weixi volcanic arc on the eastern margin of the Changdu continental block. Collision between the volcanic arcs and the Yangtze continent block during Early–Middle Triassic caused the closing of the Jinshajiang oceanic basin and the eruption of high-Si and -Al potassic rhyolitic rocks along the Permian volcanic arc. Slab breakoff or mountain-root delamination under this orogenic belt led to post-collisional crustal extension at the end of the Triassic, forming a series of rift basins on this continental margin arc. Significant potential for VHMS deposits occurs in the submarine volcanic districts of the JOB. Mesozoic VHMS deposits occur in the post-collisional extension environment and cluster in the Late Triassic rift basins.

Item Type: Article
Keywords: VHMS deposits and mineralization; Post-collisional crustal extension; The Jinshajiang orogenic belt; Southwestern China
Journal or Publication Title: Ore Geology Reviews
Page Range: pp. 177-199
ISSN: 0169-1368
Identification Number - DOI: 10.1016/S0169-1368(02)00141-5
Date Deposited: 08 Oct 2007 01:40
Last Modified: 18 Nov 2014 03:23
URI: http://eprints.utas.edu.au/id/eprint/2059
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