伸展作用下郯庐断裂带南段及邻区的地壳演化:来自接收函数的证据  

Crustal Tectonic Evolution of Tanlu Fault Zone(Southern Segment) and Adjacent Areas under the Background of Extension:Evidences from Teleseismic Receiver Function

作　　者：陈昊 李红星[1] 洪德全[2] 韩如冰 王向腾 邓居智[1] 李广 宫猛 黄光南[1] 盛书中 Chen Hao;Li Hongxing;Hong Dequan;Han Rubing;Wang Xiangteng;Deng Juzhi;Li Guang;Gong Meng;Huang Guangnan;Sheng Shuzhong(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330001,China;Anhui Earthquake Administration,Hefei 230003,China;Department of Mathematical Sciences,Tsinghua University,Beijing 100084,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌330001 [2]安徽省地震局,安徽合肥230003 [3]清华大学数学科学系,北京100084

出　　处：《地球科学》2023年第8期2905-2914,共10页Earth Science

基　　金：国家自然科学基金(No.41764006);江西省自然科学基金(No.20202BABL201027);“核资源与环境”国家重点实验室自主基金(No.Z1903);江西省研究生创新专项资金项目(No.YC2021-B159)。

摘　　要：为了更加深入了解中生代白垩世以后大陆伸展对郯庐断裂带南段地壳结构和演化的影响.利用P波接收函数对郯庐断裂带南段及其邻区的地壳厚度、泊松比特征进行研究.H-κ结果显示研究区域内的下扬子板块地壳厚度相对于华北板块更薄,并且结构变化更加剧烈,大别山造山带和苏鲁造山带之间的郯庐断裂带所在区间的平均泊松比呈现出相对低值特征.P波接收函数叠后偏移结果显示郯庐断裂带下方的地壳表现为减薄形变,且断裂带两侧地壳向郯庐断裂带处发生减薄的倾角不同.结合区域地质演化背景,认为“非对称伸展”模型可以解释早白垩世伸展作用下郯庐断裂带南段及其邻区的地壳形变及演化特征.For the more thorough understanding of the crustal structure and evolution of Tanlu fault under extension background since early Cretaceous,we completed a study about crustal thickness and Poisson′s ratio of Tanlu fault zone(southern segment) and adjacent Areas by P-wave receiver function.The results of H-κ showed the Lower Yangtze block's crust is relatively thinner and more severe deformation than the North China block's in study area.The average Poisson′s ratio beneath Tanlu fault zone exhibited lower value feature.The result of migration revealed a crustal thinning deformation beneath the Tanlu fault zone,and a significant differences on thinning dip angle of Moho toward the Tanlu fault zone on both sides of the fault zone.Furthermore,The model of Asymmetrical extension could well explain the crustal evolution of southern segment of the Tanlu fault zone and its adjacent regions under extension background since early Cretaceous.

关 键 词：接收函数 地壳形变 郯庐断裂带 白垩世大陆伸展 构造地质 

分 类 号：P315.2[天文地球—地震学]