The recent IODP drillings in the South China Sea (SCS) have greatly enhanced our understanding of the tectonics and evolution of the SCS, but also raised new questions on the opening of the SCS and the pre-SCS tectonic history. Recently available data on the South China block (SCB), SCS, Indochina block, Borneo, Sumatra, Andaman, Myanmar, and the Tibetan plateau allow an updated tectonic model for the Southeast Asian margin in the mid-Cretaceous (around 100 Ma). A global scale granitoid belt can be readily identified from Sikhote-Alin in the north all the way to Northwest Borneo and to the Qiangtang terrane, as representing a giant magmatic arc system in response to the direction change of the subduction of the Izinagi plate and the Indian-Australian plate at ∼100 Ma. This global subduction/magmatic system was displaced in the Early Cenozoic as the result of India-Asian collision, followed by the development of the escape tectonics characterized by strike-slip fault systems. The subsequent rifting further broke and dispersed the granitoid belts into fragments to the present locations in the Greater Southeast Asian tectonic realm.

中文翻译：

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白垩纪中期东南亚边缘板块构造框架模型


最近在南海 （SCS） 进行的 IODP 钻探极大地增强了我们对南海构造和演变的理解，但也对南海的开放和南海前的构造历史提出了新的问题。最近关于华南区块 （SCB）、南海、印度支那区块、婆罗洲、苏门答腊、安达曼、缅甸和青藏高原的数据允许对白垩纪中期（约 100 马）的东南亚边缘进行更新的构造模型。从北部的 Sikhote-Alin 一直到婆罗洲西北部和 Qiangtang 地层，可以很容易地识别出全球尺度的花岗岩带，它代表了一个巨大的岩浆弧系统，响应了 Izinagi 板块和印度-澳大利亚板块在 ∼100 马 的俯冲方向变化。由于印度-亚洲碰撞，这个全球俯冲/岩浆系统在新生代早期被取代，随后是以走滑断层系统为特征的逃逸构造的发展。随后的裂缝进一步破裂并将花岗岩带分散成碎片，直到大东南亚构造领域的现在位置。