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地球学报  2009 

滇中中元古界大龙口组地震灾变事件及地质意义

DOI: 10.3975/cagsb.2009.03.12

Keywords: 中元古界,大龙口组,软沉积物变形构造,臼齿构造,震积岩,昆阳裂谷

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Abstract:

软沉积物变形构造是确定古地震存在的关键证据之一。笔者在云南易门地区进行野外露头剖面调查时,在滇中新元古代大龙口组中识别出了3个地震事件层,其中发现大量的水塑性褶皱、液化构造等变形构造,主要类型包括微褶皱纹层、与液化脉有关的褶皱、与液化层有关的褶皱和受侧向挤压而成的顺层滑动、碟状泄水构造、液化脉、液化沙侵、水压破裂等构造。此外,臼齿构造与水塑性褶皱、液化构造等地震成因变形构造伴生发育,并且其脉体形态、大小、优势方位等与后者的分布、变形样式、强度等有一定的对应关系。软沉积物变形构造及臼齿构造的形态、位态及发育层位特征表明,它们的驱动机制是地震活动。迄今为止,已发现的滇中地区大龙口组震积岩均分布于罗茨?甘庄断裂的东侧,指示软沉积物变形、臼齿构造与西缘控盆断裂间存在密切的成因联系。

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