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下扬子区三叠纪层序地层样式对扬子板块与华北板块碰撞的响应

, PP. 134-141

Keywords: 华北板块,扬子板块,下扬子区,三叠纪,层序,响应

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Abstract:

下扬子区三叠纪层序地层的发育特征反映出巨大的沉积环境改变和气候变迁,即从海相环境过渡为海陆交互环境,进而转变为陆相环境;从热带气候过渡为副热带干旱气候,进而转化为温暖潮湿气候。相应的层序类型也由Ⅱ型碎屑岩与碳酸盐混合层序、Ⅰ型台地碳酸盐层序、Ⅰ型碳酸盐潮坪―泻湖层序转变为Ⅱ型海陆过渡湖泊层序和陆相湖沼层序。各种类型层序的发育、分布和保存揭示了背景的构造控制作用与改变。华北板块与扬子板块碰撞是地史上的重大地质事件,但在碰撞时间上存在着争议。下扬子区三叠纪层序地层类型转化及其反映出的海平面变化与全球海平面变化的不一致性是扬子板块与华北板快碰撞的响应。碰撞作用开始于中三叠世,下扬子区大规模海退比全球性海退提前约22Ma,碰撞前和碰撞过程中的构造条件控制了层序地层的发育与类型转化。

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