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Geological Features of the Eastern Sector of the Bangong Co‐Nujiang River Suture Zone: Tethyan Evolution
Author(s) -
Jianping WANG
Publication year - 2000
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2000.tb00455.x
Subject(s) - ophiolite , geology , fibrous joint , carboniferous , flysch , subduction , paleontology , oceanic basin , volcanic rock , stage (stratigraphy) , volcano , geochemistry , tectonics , structural basin , medicine , anatomy
According to an analysis of the geological features in the eastern sector of the Bangong Co‐Nujiang River suture zone, the Tethyan evolution can be divided into three stages. (1) The Embryo‐Tethyan stage (Pz 1 ): An immature volcanic arc developed in Taniantaweng (Tanen Taunggyi) Range, indicating the existence of an Embryo‐Tethyan ocean. (2) The Palaeo‐Tethyan stage (C‐T 2 : During the Carboniferous the northern side of the Taniantaweng Range was the main domain of the Palaeo‐Tethyan ocean, in which developed flysch sediments intercalated with bimodal volcanic rocks and oceanic tholeiite, and Pemian‐Early Triassic are granites were superimposed on the Taniantaweng magmatic are; on the southern side the Dêngqên‐Nujiang zone started secondary extension during the Carboniferous, in which the Nujiang ophiolite developed, and the Palaeo‐Tethyan ocean closed before the Middle Triassic. (3) The Neo‐Tethyan stage (T 3 ‐E): During the Late Triassic the Dêngqên zone developed into a relatively matural ocean basin, in which the Dêngqên ophiolite was formed. By the end of the Triassic intraocean subduction occurred, and the ocean domain was reduced gradually, and collided and closed by the end of the Early Jurassic, forming the Yazong mélange; then the Tethyan ocean was completely closed.