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桂北-桂东加里东期盆地构造沉降史分析

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Keywords: 盆地分析,构造沉降,加里东期,桂北-桂东

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Abstract:

对造山带各地史阶段的沉积盆地进行构造沉降分析,进而探讨其地球动力学过程,是近年来盆地分析的前缘研究之一。本文采用回剥分析技术,分别编绘了桂北、桂东地区加里东期盆地沉降曲线,并进行了构造沉降史分析。结果表明,桂北、桂东加里东期盆地演化均经历了从拉张裂解到挤压闭合的完整过程。但与桂东大瑶山地区相比,桂北兴安地区在裂陷阶段的沉积速率和构造沉降速率明显偏低;热沉降阶段的持续时间偏长;裂陷阶段与前陆挠曲阶段的分界拐点偏晚;前陆挠曲阶段,由构造宁静期的缓慢沉降向构造活动期的快速沉降转化的分界拐点也偏晚。这些差别这一方面说明了两地区具有不同的构造背景,另一方面也反映了华夏板块由南东逐渐地向北西扬子板块靠拢,沉积盆地相应地向西北迁移的动力学过程。

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