The geophysical interpretation of a Dongsha ancient uplift on the northern margin of South China Sea
The geophysical interpretation of a Dongsha ancient uplift on the northern margin of South China Sea
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DOI：
10.3969/j.issn.0001-5733.2011.12.021
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
L. Xi-wu;Liu Hong;Peng Xue-Chao
中科院分区：
文献类型：
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作者：
L. Xi-wu;Liu Hong;Peng Xue-Chao
根据地震剖面解释，南海北缘地区识别出一条古老隆起带。该带呈东北走向，长约550公里，宽约60公里。该带与南海北缘的高正磁异常带形状吻合。因此，本文认为这条古老隆起带是高正磁带的起源。东沙古隆起带是一条与俯冲有关的弧带。由于俯冲作用，岩浆侵入发生在弧带下方。并且由于俯冲持续时间短，侵入仅发生在弧带较深的部位。因此，岩浆在弧带较深部位聚集、凝固，并获得较高的正磁性。
Based on the interpretation of seismic profiles, an ancient uplift belt was distinguished along the northern margin of South China Sea. This belt is striking in northeastern direction and about 550 km in length and 60 km in width. This belt is coincided well in shape with a high positive magnetic anomaly zone on the northern margin of South China Sea. So, the paper believed that this ancient uplift belt is the origin of the high positive magnetic zone. Dongsha ancient uplift belt was a subduction related arc belt. Due to the subduction, the magma intrusion happened under the arc belt. And due to a short duration of the subduction, the intrusion only happened at the deeper part of the arc belt. So the magma accumulated and solided at the deeper part of the arc belt and acquired high positive magnetic.