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首页> 外文期刊>Journal of Asian earth sciences >Crustal structure of the Gunsan Basin in the SE Yellow Sea from ocean bottom seismometer (OBS) data and its linkage to the South China Block
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Crustal structure of the Gunsan Basin in the SE Yellow Sea from ocean bottom seismometer (OBS) data and its linkage to the South China Block

机译：从海底地震仪（OBS）数据看东南黄海群山盆地地壳结构及其与华南区块的联系

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摘要

Two major tectonic units in NE Asia are the Sims-Korean (or North China) and South China Blocks that collided in the Permo-Triassic periods. The South China Block is suggested to extend eastward to the Korean Peninsula across the southern Yellow Sea. The Gunsan Basin is a well-defined, fault-bounded sedimentary basin in the SE Yellow Sea and is regarded as a structural link of the South China Block to the Korean Peninsula. We collected deep seismic sounding data recorded on ocean bottom seismometers to investigate how the crustal structure and nature of the South China Block vary in the Gunsan Basin toward the middle part of the Korean Peninsula. The main part of the Gunsan Basin is underlain by relatively thin (similar to 10 km thick) upper and much thicker (similar to 20 km thick) lower crustal layers, indicating a close affinity to the South China Block; whereas it shows distinction from the Korean Peninsula underlain by upper and lower crustal layers with equal (similar to 15 km) thickness. A change in crustal structure is recognized under the eastern margin of the Gunsan Basin toward the Korean Peninsula, that features a transition to the Korean Peninsula. The thick lower crustal layer in the Gunsan Basin appears to be inherited from the evolution of the South China Block including crustal shortening associated with the assembly of Rodinia in the Neoproterozoic before the collision between the Sino-Korean and South China Blocks.
机译：亚洲东北部的两个主要构造单元是在二叠纪-三叠纪时期相撞的西姆斯-朝鲜（或华北）和华南地块。建议将华南地块向东延伸到横跨黄海南部的朝鲜半岛。群山盆地是东南部黄海中界限分明的沉积盆地，被视为华南地块与朝鲜半岛的结构性连接。我们收集了记录在海底地震仪上的深层地震测深数据，以研究群山盆地中朝朝鲜半岛中部的华南地块的地壳结构和性质如何变化。群山盆地的主体位于上地壳相对较薄（约10 km厚）和下地壳较厚（约20 km厚）的底层，这表明与华南地块有密切的亲缘关系。而与朝鲜半岛底层的区别则在于上，下地壳层的厚度相等（约15 km）。在群山盆地东缘向朝鲜半岛的方向下，地壳结构发生了变化，这是向朝鲜半岛过渡的特征。群山盆地下部厚的地壳层似乎是从华南地块的演化继承而来的，包括在中韩地块与华南地块碰撞之前，新元古代的罗迪尼亚组装所造成的地壳缩短。

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