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江南隆起带幕阜山岩体新生代剥蚀冷却的低温热年代学证据

DOI: 10.6038/cjg20130617, PP. 1945-1957

Keywords: 幕阜山岩体,低温热年代学,江南隆起,构造演化史,裂变径迹

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Abstract:

江南隆起位于扬子与华夏地块的碰撞汇聚带,是研究华南大地构造演化的关键地质单元.本文采用磷灰石裂变径迹及(U-Th-Sm)/He年龄分布特征定性分析与径迹长度分布数据定量模拟相结合,主要研究了幕阜山岩体新生代的隆升与剥蚀过程,并在此基础上结合区域构造背景,对其构造-热演化之间的关系进行了探讨.自晚白垩世持续隆升以来,幕阜山岩体经历的平均剥蚀厚度约4800m.在不同岩体间,隆升过程及幅度存在差异,空间上具有非均匀性.热史结果显示幕阜山岩体经历了3期剥蚀,其中两期快速剥蚀分别发生在晚白垩世-古近纪(80~50Ma)和10Ma以来,而这之间为一期缓慢剥蚀过程.研究区古近纪的快速剥蚀反映了中-下扬子喜山期大规模伸展断陷作用造成的肩部块体快速剥蚀事件;约10Ma以来的快速剥蚀是对太平洋板块向西运动的响应.幕阜山岩体自燕山晚期以来的隆升剥蚀作用具有良好的盆地沉积响应,三期隆升剥蚀事件与研究区构造演化的动力学背景相吻合.

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