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山东省灵山岛早白垩世软沉积物变形构造特征*

, PP. 717-728

Keywords: 山东省,灵山岛,早白垩世,滑塌褶皱,软沉积物变形,古地震

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Abstract:

利用野外露头和镜下薄片等资料、地质统计等方法,对山东省灵山岛老虎嘴剖面和船厂滑塌剖面软沉积物变形构造分布特征和形成期次进行了研究。船厂剖面发育滑塌褶皱、负载构造、阶梯断层、布丁构造、球—枕构造等典型的软沉积物变形构造;老虎嘴剖面发育层内褶皱、微阶梯断层、层内角砾岩等。根据形成时间、发育部位和形态特征,将船厂剖面变形划分为滑塌前变形和滑塌中变形,滑塌前变形又可以细分滑塌体下部变形和滑塌体内部变形。滑塌褶皱具有多级别、多尺度的特点;以厚岩层组成的滑塌褶皱为主,尺寸为米级;岩层内部纹层形成的次级褶皱为辅,尺寸为毫米级。滑塌过程中岩层不同部位应力不同,伴生其他变形构造,如拉张形成的布丁构造和挤压形成剪切褶皱等。滑塌前已经形成的负载构造等在滑塌过程中保持原来形态,不因地层变形而变形。这些古地震触发形成的软沉积变形构造证明灵山岛在早白垩世古地震活动频繁。

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