Late Triassic bivalves associated with a hydrothermal vent system in the Yidun Island Arc (SW China) of the eastern Tethys

Lin Li , Zhu Lidong , Pang Yanchun , Sha Jingeng , Fürsich F, Fu Xiugen , Wang Xinli (2011)

Publication Language: English

Publication Type: Journal article

Publication year: 2011

Journal

Science China-Earth Sciences Springer Verlag (Germany)

Book Volume: 54

Pages Range: 1864-1870

Journal Issue: 12

DOI: 10.1007/s11430-011-4302-2

Abstract

The Yidun Island Arc in the Three Rivers (Jinsha River, Lancang River, Nujiang River) region of southwestern China is one of the most important Kuroko-type volcanogenic massive sulfide deposits (VMS) in China. Intra-arc rifting of Yidun Island occurred during the Late Carnian-Norian when VMS deposits such as the Gacun Pb-Zn-Cu deposit were formed. A bivalve fauna was found in fine-grained tuffaceous slate and in mineralized tuffaceous siltstone containing very high contents of Pb (45.01-103.37 ppm) and Zn (135.78-300.03 ppm) of the upper Tumugou Formation in the Changtai-Gacun volcanic-sedimentary rift basin. Stratigraphically, the bivalve-bearing beds are equivalents of the Gacun Pb-Zn-Cu deposits. The diversity of this bivalve fauna is very low. It consists mainly of the thin-shelled, epibyssate suspension-feeding bivalves Pergamidia eumenea and Parapergamidia changtaiensis, the burrowing large, elongated, suspension-feeding Trigonodus keuperinus and Unionites? sp., and occasional specimens of the endobyssate suspension-feeding Trigonodus? sp. and the deep burrowing suspension-feeding Pleuromya markiamensis. Individuals of the first four taxa are so abundant that the specimens are sometimes concentrated in shell beds, probably indicating a gregarious habit. This bivalve fauna is associated with internal moulds of cylindrical, slightly conical tubes most likely produced by a worm-shaped organism. Composition, morphology, diversity, and high abundance of this fauna, chemical features of the surrounding sediment, and the tectonic setting all suggest that this bivalve fauna lived in a deep-water environment in or around a hydrothermal vent system. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg.

Authors with CRIS profile

Franz Fürsich Naturwissenschaftliche Fakultät

Involved external institutions

Chengdu University of Technology CN China (CN) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) China University of Geosciences / 中国地质大学 CN China (CN)

How to cite

APA:

Lin Li, ., Zhu Lidong, ., Pang Yanchun, ., Sha Jingeng, ., Fürsich, F., Fu Xiugen, ., & Wang Xinli, . (2011). Late Triassic bivalves associated with a hydrothermal vent system in the Yidun Island Arc (SW China) of the eastern Tethys. Science China-Earth Sciences, 54(12), 1864-1870. https://doi.org/10.1007/s11430-011-4302-2

MLA:

Lin Li, , et al. "Late Triassic bivalves associated with a hydrothermal vent system in the Yidun Island Arc (SW China) of the eastern Tethys." Science China-Earth Sciences 54.12 (2011): 1864-1870.

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