Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan and Guangxi, China
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Abstract:
Recent discoveries of ophiolites indicate that there must be a Palaeotethyan geosuture zone bordering China and Vietnam, which separates the Vietbac block from the South China subcontinent. The Indosinian foreland fold-and-thrust belt bordering Yunnan and Guangxi provided further evidence for the palaeotethysides. The oceanic crust was subducted southwestwards while the magmatic arc migrated northeastwards, and the continent-arc collision occurred in the Late Triassic with the thrusting being extended towards the north or northeast. The features of thrust-nappe structure are discussed, which proved the continental margin of the Palaeotethyan ocean there to be a complicated one. A face-to-face collision occurred first along the NW-striking segment and then along the ENE-striking segment accompanied by transpression or oblique thrusting occurring along the NW-striking one.
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WU Genyao Institute of Geology, Geophysics, Chinese Academy of Sciences, Beijing .2001. Indosinian Foreland Fold-and-Thrust Belt Bordering Yunnan and Guangxi, China[J]. Acta Geologica Sinica(),75(4):