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地质论评  2011 

新疆西南天山下侏罗统软沉积物变形研究

Keywords: 塔拉斯―费尔干纳断裂,负载,滴状体,液化均一层,液化不整合,早侏罗世

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Abstract:

新疆西南天山乌恰地区早侏罗世软沉积物变形位于湖相砂岩中;由地震触发的软沉积物变形有三个层位,位于下侏罗统康苏组的顶部。变形主要类型为负载(load)、球枕(ballandpillow)、滴状体(droplet)、锥形体(cusps)、液化均一层(homogeneouslayer)和液化不整合(liquefiedunconformity)。三个变形层位反映乌恰地区早侏罗世末曾连续发生过三次强地震;变形类型机制不同反映三次地震强度有别。乌恰下侏罗统处于中亚塔拉斯―费尔干纳巨型走滑断裂控制的拉分盆地中,断裂走滑伴随地震直接诱发软沉积物变形;古地震震级为Ms6?5~7。

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