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地质学报 2002

东疆哈尔里克变质带的U―Pb年龄及其地质意义

, PP. 379-383

Keywords: 变质带锆石U－Pb年龄热变质作用断裂区域变质作用拉伸盆地

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Abstract:

东疆哈尔里克变质带曾经历了两期变质作用,早期的区域性热变质作用的U-Pb年龄为305.9±2.9Ma,属于早、中石炭世;晚期的断裂区域变质作用的U-Pb年龄为293.8±3.3Ma～296.3±3.5Ma,属于晚石炭世末期。早期的变质作用年龄可能是该区拉伸盆地形成的时间,而晚期的变质作用年龄则代表了A型俯冲形成的构造热事件年龄。

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