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地球学报  2006 

湘东南地区中、新生代山体隆升过程的热年代学研究

DOI: 10.3975/cagsb.2006.06.02

Keywords: 热年代学,构造隆升,中—新生代,湘东南

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Abstract:

湘东南地区位于南岭中段北缘。本文应用热年代学方法,测定了湘东南地区5个侵入体的热历史,进而分析湘东南中新生代的隆升过程,并结合区域构造背景,对热演化过程与构造发展过程之间的关系进行了探讨。研究结果表明,湘东南地区中新生代山体隆升过程总体上分为由较快速→快速→缓慢→快速的4个阶段,222~146.Ma期间以0.069mm/a的平均速率较快隆升,146.4~94.11Ma期间以0.113~0.186mm/a的平均速率快速隆升,94.11~14.8Ma期间以0.014~0.028mm/a的平均速率缓慢隆升,14.8Ma~0.0Ma以0.143~0.295mm/a的平均速率快速隆升。晚近时期的隆升总体呈加速趋势。隆升过程在空间上具有非均匀性,不同岩体间隆升过程存在差异。地壳隆升过程在时间上具有明显的互补性,早期具较快速或较大幅度隆升的岩体,通常伴随着晚期相对较慢和较小幅度的隆升。根据热年代学分析结果,结合区域构造背景和其它地质资料,推断五峰仙、大义山、骑田岭等地区在中三叠世后期因构造叠置增厚了4100~7700m以上,证明印支运动早期为强烈的陆内挤压造山运动。燕山晚期岩体隆升和降温由早期构造剥蚀和晚期风化剥蚀造成,并具有良好的盆地沉积响应。湘东南地区晚近时期的快速隆升是区域性整体抬升。

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