Depth distribution of the sedimentary basin and Moho undulation in the Yellow Sea, NE Asia interpreted by using satellite-derived gravity field
Depth distribution of the sedimentary basin and Moho undulation in the Yellow Sea, NE Asia interpreted by using satellite-derived gravity field
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DOI：
10.1093/gji/ggv108
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发表时间：
2015-07
影响因子：
2.8
通讯作者：
Sungchan Choi;In-Chang Ryu;H. Götze
中科院分区：
文献类型：
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作者：
Sungchan Choi;In-Chang Ryu;H. Götze
通过对TRIDENT卫星重力场的解译，对黄海地区地壳密度结构的空间分布进行了详细的研究。我们使用三维正演密度模型的解释，结合现有的地质和地球物理信息的约束。采用重力剥离法分离出不同地质地壳结构的重力效应。由此可知：（1）群山沉积盆地是均衡补偿的。(2)卫星测得的布格异常范围为15 ~ −30 × 10− 5 m s− 2，与黄海盆地厚度有关。(3)计算出的黄海莫霍面深度在深沉积盆地的27 km到隆起带的34 km之间变化。(4)莫霍面深度计算表明，黄海存在两个明显的区域，即莫霍面最深区域和地壳厚度最大区域。一个地区沿着千里岩隆起带从胶东延伸到洪成，另一个地区从中国东南部延伸到朝鲜半岛的洪成。与前人的研究结果相比较，我们认为它们是从中国经黄海延伸到朝鲜半岛的南北陆块碰撞带的一部分。
We interpreted the TRIDENT satellite derived gravity field to provide detailed insights into the spatial distribution of the crustal density structures in the area of the Yellow Sea. We used 3-D forward density modelling for the interpretation that incorporated constraints from existing geological and geophysical information. A gravity stripping method is used to separate out the gravity effects of different geological crustal structures. From this analysis we see that (1) the Gunsan sedimentary basin is isostatically compensated. (2) The satellite-derived Bouguer anomalies ranging from 15 to −30 × 10−5m s−2are linked to basin thicknesses in the Yellow Sea. (3) The calculated Moho depth in the Yellow Sea varies from 27 km beneath the deep sedimentary basin to 34 km in the uplifted zones. (4) Moho depth calculations show two distinct areas, characterized by the deepest Moho depths and the largest crustal thicknesses in the Yellow Sea. The one region extends along the Qianliyan Uplift Zone from Jiaodong to Hongsung while the other area extends from southeastern China to Hongsung in the Korean peninsula. Compared to previous works we suggest that they are the part of the collisions zone between North and South China Blocks extending from China to the Korean peninsula via the Yellow Sea.