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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bangong suture ： ウィキペディア英語版 Bangong suture The Bangong suture zone is approximately 1200 km long and trends in an east-west orientation, and a key location in the central Tibet conjugate fault zone. Located in central Tibet between the Lhasa (southern block) and Qiangtang (northern block) terranes, it is a discontinuous belt of ophiolites and mélange〔 that is 10–20 km wide, up to 50 km wide in places. The northern part of the fault zone consists of northeast striking sinistral strike-slip faults while the southern part consists of northwest striking right lateral strike-slip faults. These conjugate faults to the north and south of the Bangong intersect with each other along the Bangong-Nujiang suture zone.〔 == Collision and suture development == The geology of the suture includes Jurassic marine shale and conglomeratic strata, melange and ophiolites and volcanic rocks from multiple pulses of magmatism. Each of these lithologies can be tied to specific terranes, either island arcs or microcontinents, that were gathered in front of the Indian subcontinent as it drifted northward during the Mesozoic. During the Jurassic-Cretaceous collision of the Lhasa and Qiangtang terranes, the ancient Tethys ocean closed,〔〔 creating the Bangong suture zone. Oceanic lithosphere (the Meso-Tethys) was consumed during this collision and subducted under the Qiangtang terrane.〔 This led to obduction of ophiolites on the northern margin of the Lhasa terrane〔 This period of obduction is generally accepted to mark the end of oceanic subduction beneath southern Qiangtang and the onset of Lhasa-Qiangtang collision.〔 An important feature of the Bangong suture is the Amdo basement. This exposure of pre-Mesozoic crystalline basement is ~100 km long and ~50 km wide.〔 Geology of the Amdo records Mesozoic metamorphism, magmatism, and exhumation and is composed of orthogneisses and metasediments which are intruded by undeformed granitoids.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bangong suture」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.