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首页> 外文期刊>Journal of Asian earth sciences >Tectono-stratigraphy of Late Carboniferous to Triassic successions of the Khorat Plateau Basin, Indochina Block, northeastern Thailand: Initiation of the Indosinian Orogeny by collision of the Indochina and South China blocks
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Tectono-stratigraphy of Late Carboniferous to Triassic successions of the Khorat Plateau Basin, Indochina Block, northeastern Thailand: Initiation of the Indosinian Orogeny by collision of the Indochina and South China blocks

机译：泰国东北部印度支那地区霍拉特高原盆地晚石炭世至三叠纪演替的地层地层：印度支那和华南地区的碰撞引发印度支系造山作用

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The late Paleozoic and early Mesozoic Indosinian Orogeny in Southeast Asia was characterized by subduction in the Paleo-Tethys and collisions among continental blocks and fragments. The Khorat Plateau Basin in northeastern Thailand covers much of the Indochina Block and was subjected to complex tectonic activity during the late Paleozoic and Mesozoic. The Mesozoic sequence of the basin comprises thick, gently folded non-marine sediments that include red beds and is separated from the underlying upper Paleozoic sequence by the major angular unconformity of the Permo-Triassic boundary, which we refer to as the "Indosinian I event" in the Khorat Plateau Basin. Seismic and well data acquired for oil and gas exploration indicate that the upper Paleozoic sequence is heavily faulted and structurally complex. Our study showed that in some areas about 2000 m of the upper Paleozoic sequence has been eroded at the Indosinian I unconformity, although thicknesses of up to similar to 6000 m of upper Paleozoic rocks remain in some areas. Previous interpretations of oil and gas exploration data attribute the erosional event to back-arc closure due to collision of the Indochina and Sibumasu blocks during subduction in the Paleo-Tethys Ocean. However, our detailed structural mapping indicated that the Indosinian I unconformity was a consequence of the collision of the Indochina and South China blocks during the late Permian to Middle Triassic. We propose that this collision initiated the Indosinian Orogeny in mainland Southeast Asia.
机译：东南亚的晚古生代和早中生代印支期造山带的特征是古特提斯俯冲作用以及大陆块和碎片之间的碰撞。泰国东北部的霍拉特高原盆地覆盖了印度支那地区的大部分地区，并在古生代和中生代晚期经历了复杂的构造活动。该盆地的中生代层序包括厚厚的，缓折的非海洋沉积物，其中包括红层，并通过二叠系-三叠纪界线的主要角度不整合面与下层古生界序列分开，我们称其为“印度支那一世”。事件”在霍拉特高原盆地中进行。油气勘探获得的地震和井数据表明，上古生代层序严重断裂且结构复杂。我们的研究表明，在某些地区，大约2000 m的上古生界序列在印度支那一世不整合面被侵蚀，尽管某些地区仍保留了高达6000 m的上古生界岩石厚度。石油和天然气勘探数据的先前解释将侵蚀事件归因于古特提斯洋俯冲过程中印度支那和西布马苏区块的碰撞导致的弧后封闭。但是，我们详细的结构图表明，印度支那一世不整合是二叠纪晚期至中三叠世期间印度支那和华南地块碰撞的结果。我们认为这次碰撞引发了东南亚大陆的印支期造山运动。

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