哀牢山—红河剪切带新生代热史演化及其构造意义  

Cenozoic thermal evolution and tectonic significance of the Ailao Mountains-Honghe River shear zone

作　　者：孙崇波 李敏同 李俊 周洪兵 陈晓东 SUN Chongbo;LI Mintong;LI Jun;ZHOU Hongbing;CHEN Xiaodong(Sichuan Institute of Metal Geology,Chengdu,611730)

机构地区：[1]四川省金属地质调查研究所,成都611730

出　　处：《地质论评》2023年第5期1639-1648,共10页Geological Review

基　　金：中国地质调查局“西南三江成矿带南段基础地质调查”项目(编号:1212010880406、1212011120582)的成果。

摘　　要：笔者等通过对哀牢山—红河剪切带5件砂岩磷灰石样品裂变径迹分析,获得测试分析样品的表观年龄,对所有样品利用模拟退火法进行了热史模拟,取得其热演化史;得出哀牢山—红河剪切带在新生代发生了相似的构造演化过程,其经历了2次快速冷却剥露事件,分别发生在37~14 Ma和5.1~0 Ma,平均冷却速率分别为3.98℃/Ma和11.15℃/Ma;在发生快速冷却的时间上,存在自东向西逐渐变晚的趋势,说明哀牢山—红河剪切带在新生代可能为自东向西的幕式隆升。Objectives:Obtain the apparent age and thermal evolution history of apatite samples in the Ailao Mountains-Honghe River(Red River)shear zone(Ailaoshan-Honghe Shear Zone),then analyze the Cenozoic tectonic significance of the the Ailao Mountains-Honghe River shear zone.Methods:Apatite fission track of sandstone,thermal history modeling.Results:The apparent age of apatite fission track is 31.0~18.0 Ma.The cooling history simulation shows that rapid cooling occurs at 37~14 Ma,and the average cooling rate is 3.98℃/Ma;rapid cooling has occurred since 5.1 Ma,and the average cooling rate is 11.15℃/Ma.Conclusions:The Ailao(Mounains)tectonic zone has experienced twice similar tectonic evolutions since Cenozoic Era,and the rapid exhumation event from 37 Ma to 14 Ma and since 5.1 Ma.The rapid cooling in the Ailao Mountains area are characterized by imbalance.In the time of rapid cooling,there is a tendency to gradually become late from east to west,indicating that the southern section of Ailao Mountains may be a curtain uplift from east to west in the new generation.

关 键 词：哀牢山—红河剪切带 构造隆升 砂岩磷灰石裂变径迹 热历史模拟 

分 类 号：P548[天文地球—构造地质学] P534.6[天文地球—地质学]