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地质论评  2003 

郯庐断裂带肥东韧性剪切带的变形规律同位素年龄及其构造意义

Keywords: 郯庐断裂带大别-胶南造山带韧性剪切带花状构造同位素年龄

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Abstract:

郯庐断裂带肥东韧性剪切带的几何学形态为一正花状左行平移断裂带,目前出露的为该韧性剪切带的根部,具有典型的深层次左行走滑变形特征,肥东韧性剪切带中糜棱岩,超糜棱岩测得的^40Ar/^39Ar全岩年龄分别为120.48Ma和118.75Ma,说明郯庐断裂带的大规模左行平移时代为早白垩世,对该带构造变形和构造叠加的研究表明,肥东浮槎山一带是被郯庐断裂带截切,牵引,叠加,改造的印支期大别一胶南造山带的残块,郯庐断裂带与大别-胶南造山带是不同时期,不同构造系统的产物,前者属于滨太平洋构造系统,后者属于特提斯构造系统。

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