From Andean orogen to Gangdese orogeny: from ocean continent subduction to continent-continent collision

被引：0
|
作者：
Xu Z. [1 ]
Zhao Z. [2 ]
Ma X. [2 ]
Chen X. [2 ]
Ma Y. [2 ]
机构：
[1] School of Earth Sciences and Engineering, Nanjing University, Nanjing
[2] Institute of Geology, Chinese Academy of Geological Sciences, Beijing
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2019年 / 93卷 / 01期
关键词：
Andean orogenic belt; Gangdese orogenic belt; Orogenic types;
D O I：
10.19762/j.cnki.dizhixuebao.2019001
中图分类号：
学科分类号：
摘要：
The global orogenic system can be divided into two main types: accretionary type and collisional type. Nowadays, studies of two giant orogenic systems on the Earth shows that 1) the accretionary orogenic system are happening around the Pacific Ocean by oceanic plates subducted beneath continental plates, and 2) the Himalayan collisional orogenic system has entered the stage of continent-continent collision after oceanic plate-continental subduction. Among them, the Andean orogenic belt is a typical "Andean island arc belt" and "Andean-Cordillera subduction related accretionary orogenic system" which characterized by "deep (steep)-shallow (flat) alternating subduction of the oceanic plate, oceanic island-continent accretional collision and subduction induced plateau uplift" that formed by the multi-stage subduction of the Lazaca oceanic plate in the eastern Pacific Ocean. The Gangdese orogeny belt, located in the interior of the Asian continent, underwent two mainly orogenic stages. The first stage is represented by northward oceanic plate subduction, while subduction accompanied closure of the Neo-Tethys oceanic basin. This stage includes forming the multi-oceanic islands in the Neo-Tethys, which probably initiated in the early Mesozoic, and multi-stages subduction and convergence between the Lhasa terrane and oceanic islands. That results in the accretion and collision of the oceanic islands and the Lhasa terrane which lead to form the Gangdese magmatic arc and is similar to the Andean-type subduction-accretion orogenic system. Meanwhile, initial Gangdese Plateau may develop during the magma eruption and transformation from subduction to collision. In the early Cenozoic, the Gangdese orogeny belt entered the second stage of continent-continental collision between Indian and Asian continents. Then it formed large-scale E-W trending thrust faults, strike-slip faults and S-N trending rift systems. Therefore, the Andean orogeny belt is the geological history of the Gangdese orogeny evolution, current Gangdese orogeny belt is the future geology of the Andean orogenic belt. Aim to study the tectonic evolution of Gangdese orogeny belt, especially the early tectonic magmatic activity, we must compare the geological evolution of the Andean subduction and accretion process. © 2019, Science Press. All right reserved.
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页码：1 / 11
页数：10
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