Geochemical Discrimination of Tectonic Environments of the Yalung Zangpo Ophiolite in Southern Tibet
详细信息   
摘要

    

Elemental compositions for the basaltic rocks from Xialu ophiolite, Xigaze, central Yalung Zangpo ophiolite in southern Tibet were studied in this paper. Accoding to a detailed geochemical discrimination of selected elements from 246 samples from literature and this work, the authors  identify at least four different types of tectonic settings within the 1 500 km-long Yalung Zangpo ophiolite.  The four-type basalts are 1) continental arc; 2) mantle plume or hot spot; 3) MORB and oceanic arc; and 4) typical oceanic arc. The presence of multiple tectonic settings seen from geochemical signatures of associated basalts within the Yalung Zangpo suture zone reconstructs a long-evolutional history of the Tethyan Ocean.

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