[1]刘一鸣,李三忠,于胜尧,等.青藏高原班公湖?江缝合带及周缘燕山期微地块聚合与增生造山过程[J].大地构造与成矿学,2018,(优先出版):824-838.[doi:10.16539/j.ddgzyckx.2019.04.013]
 LIU Yiming,LI Sanzhong,YU Shengyao,et al.The Mesozoic Collage and Orogeny Process of Micro-blocks in Bangong-Nujiang Suture Zone, Tibetan Plateau[J].Geotectonica et Metallogenia,2018,(优先出版):824-838.[doi:10.16539/j.ddgzyckx.2019.04.013]
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青藏高原班公湖?江缝合带及周缘燕山期微地块聚合与增生造山过程
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
824-838
栏目:
出版日期:
2019-12-30

文章信息/Info

Title:
The Mesozoic Collage and Orogeny Process of Micro-blocks in Bangong-Nujiang Suture Zone, Tibetan Plateau
作者:
刘一鸣 李三忠 于胜尧 曹现志 周 洁 李 阳 王誉桦 徐林山 郭润华 周在征
Author(s):
LIU Yiming LI Sanzhong YU Shengyao CAO Xianzhi ZHOU Jie LI Yang WANG Yuhua XU Linshan GUO Runhua and ZHOU Zaizheng
关键词:
青藏高原 燕山期 微地块 聚合增生
Keywords:
Tibetan Plateau Yanshanian micro-blocks collage
DOI:
10.16539/j.ddgzyckx.2019.04.013
文献标志码:
A
摘要:
班公湖?江洋多岛弧盆体系的俯冲闭合过程对于研究青藏高原早期形成与演化具有重要意义。本文系统总结了羌南?山地块与拉萨地块燕山期的岩浆岩、沉积序列以及变质变形特征, 详细探讨了其与班公湖?江洋俯冲闭合过程的联系。研究结果显示随着特提斯大洋的打开, 羌南?山地块、拉萨地块、聂荣微地块和嘉玉桥微地块均作为裂生微地块从冈瓦纳大陆北缘裂解出来, 北拉萨地块是班公湖?江洋南向俯冲弧后扩张裂解的产物, 并随着大洋的南向俯冲, 逐渐演变为增生型微地块。随着洋盆的闭合这些微地块作为残生微地块碰撞拼贴在一起, 保留在造山带之中。班公湖?江洋在燕山期经历了复杂而漫长的多个微小地块的碰撞增生过程。该过程最早可能始于晚侏罗世, 并主体于早白垩世末期?白垩世初期汇聚消亡, 期间经历了纵向和横向的双重穿时性。印度?鲁藏布江洋的北向俯冲作用对于班公湖?江洋的汇聚消亡以及青藏高原现今主体构造格架形成至关重要。
Abstract:
The subduction and closure of the Bangong-Nujiang Ocean are recognized as significant events in the geotectonic evolution of the Tibetan Plateau. This study focuses on the Mesozoic magmatic rocks, sedimentary strata, metamorphic and deformation features, and discusses their relation in details with the evolution of the Bangong-Nujiang Ocean. The Qiangnan-Baoshan, Lhasa, Nierong and Jiayuqiao micro-blocks rifted from the northern margin of the Gondwana as some rifting-induced micro-blocks. The northern Lhasa micro-blocks was a product of back–arc spreading of the Bangong-Nujiang Ocean, and evolved into an accretion-induced micro-blocks attributing to the southward subduction of the Bangong-Nujiang Ocean. All these micro-blocks collaged together as subduction-derived micro-blocks preserving in the orogenic belt. The Bangong-Nujiang Ocean experienced a complex and long-term process of multiple collage and collision among micro-blocks during the Mesozoic period. This process may start in the Late Jurassic and mainly complete at the end of the Early Cretaceous to early Late Cretaceous. Both longitudinal and transverse diachronism occurred during the closure of the Bangong-Nujiang Ocean. The northward subduction of the Indus-Yarlung Zangbo Ocean is important to the closure of the Bangong-Nujiang Ocean, as well as the formation of the modern tectonic framework of Tibetan Plateau.

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更新日期/Last Update: 2019-08-04