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珠江口盆地东沙隆起的沉降史及其动力机制

, PP. 117-124

Keywords: 南海,珠江口盆地,东沙隆起,构造沉降,动力机制

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Abstract:

根据东沙隆起及其周围钻井资料的一维构造沉降对比分析,结合前人在基底、盖层及断裂等方面的研究,将东沙隆起地区的构造演化分为5个阶段:白垩纪挤压阶段、古新世-早渐新世伸展断陷阶段、早渐新世末期抬升剥蚀阶段、晚渐新世-中新世快速的裂后沉降阶段、晚中新世以来断块升降阶段。认为下地壳高速层是促使早渐新世末期抬升剥蚀的重要因素,而与高磁异常带、磁静区没有密切的联系。

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