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The Boundary Between Gondwana and Pacifica and the Suturing Ages of Their Allied Terranes in Southwestern China

Acta Geologica Sinica(English Edition) 1991年第1期65卷 87-95页

作者： guo fuxiang institute of prediction of hidden ore deposits, guilin college of metallurgical geology, guilin 541004, guangxi institute of prediction of hidden ore deposits Guilin College of Metallurgical Geology Guilin 541004 Guangxi

Two terranes formed since the Late Palaeozoic can be distinguished in southwestern China. One is charac-terized by the Permo-Carboniferous ice-rafted marine gravel-bearing clastic formation and the cold-water faunaof the Gondwana facies, including the Gangmar Co, Lhasa, Sa' gya, Tengchong and Baoshan terranes and theother is marked by the Upper Palaeozoic of the Yangtze type with the Cathaysian flora and the Pacific-typefusulinids, comprising the Changning-Menglian, Shuangjiang-Lancang, Qamdo and Bayan Har terranes. TheLongmu Co-Shuanghu-Dengqen-North Lancang River-Kejie-Mengding suture zone between the two groups ofterranes is the boundary between Gondwana and Pacifica in southwestern China. On the grounds of thesedimentary formation and successive southwestward migration of the Asian nonmarine Jurassic-Cretaceousendemic bivalves, the ages of the suture and some terranes to the southwest of the suture zone are *** Baoshan terrane and the Nyainrong-Sog terrane in the Lhasa composite terrane were firstly pieced togeth-er with the Asian continent in the early Early Jurassic. The northern Tibet-western Yunnan microplate, in-cluding the Gangmar Co, Lhasa and Tengchong terranes, collided with the Asian continent at the end of theEarly Cretaceous Neocomian.

关键词： The Boundary Between Gondwana and Pacifica and the Suturing Ages of Their Allied Terranes in Southwestern China

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