摘要
本文在对以青藏高原为主体的东特提斯30多年来的地质调查和研究实践基础上,通过与现今西南太平洋区域弧盆构造体系的对比研究,提出了适合于板块构造登陆的现实主义替代模型-多岛弧盆系构造模式。大洋岩石圈与大陆岩石圈之间的多岛弧盆系构造模式是板块构造登陆的入门向导,是认识大陆地质演化的关键。基于该模式研究认为,特提斯大洋最初开始于Rodinia超大陆解体的晚前寒武纪晚期,比太平洋体系更老。青藏高原形成受控于不同时期大陆边缘多岛弧盆系构造演化,一系列弧后或弧间盆地消亡、弧-弧或弧-陆碰撞的岛弧造山作用实现大陆边缘增生。该现实主义模式即可成功地解释青藏高原的形成演化过程,亦可为现在和将来特提斯构造域与亚洲大陆的地质工作所检验。多岛弧盆系构造的识别与深入研究不仅在造山带具有强大的生命力,能够全面解剖造山带的物质组成、结构构造与演化历史,而且对于分析前寒武纪大陆克拉通基底的形成也具有重要启示。
Based on the last more than 30 years＇ field geological survey and research on the Qinghai-Xizang Plateau as the main part of eastern Tethys and the comparative study with the present-day southwestern Pacific regional arc-basin tectonic systems, the authors in the present paper propose a realist alternative model, namely the tectonic model of archipelagic arc-basin systems, which is suitable for explaining the plate tectonic theory landing on the continents. The tectonic model of archipelagic arc-basin systems between the oceanic lithosphere and continental lithosphere is interpreted to be the rudimental guide of plate tectonic theory landing on the continents and the key to understanding the geological evolution of the continents. According to this model, the Tethys Ocean was initiated during the late stage of the Late Precambrian older than the Pacific systems, during which the breakup of the Rodinia supercontinent came into existence. The formation of the Qinghai-Xizang Plateau was controlled by the tectonic evolution of the continental marginal archipelagic arc-basin systems in different periods. The consumption of a series of back-arc or inter-arc basins and island-arc orogenesis triggered by arc-arc or arc-continental collision gave rise to the continental marginal accretion. The realistic model can successfully explain the formation and evolution of the Qinghai-Xizang Plateau, and will be tested by further geological research of the Tethyan tectonic domain and the Asian continents. The recognition and research of archipelagic arc-basin systems not only lead to a better understanding of compositions, textures and structures, and evolutionary history in orogenic belts, but also have important implications for recongnizing the basement formation of the Precambrian continental craton.
出处
《沉积与特提斯地质》
CAS
CSCD
2012年第3期1-20,共20页
Sedimentary Geology and Tethyan Geology
基金
国家973项目"三江特提斯复合造山与成矿作用"(编号:2009CB421000)下属课题"特提斯演化过程中的VMS型Cu-Pb-Zn成矿作用"(编号:2009CB421003)
中国地质调查局"青藏高原重大关键地质问题研究"计划项目(编号:1212011121200)联合资助
关键词
洋陆转换
多岛弧盆系构造
大陆地质
特提斯
青藏高原
oceanic-continental transition
archipelagic arc-basin system
continental geology
Tethys
Qinghai- Xizang Plateau
