华北地区岩石圈有效弹性厚度及其地球动力学意义  

The Effective Elastic Thickness of the Lithosphere in North China and Its Geodynamic Significance

作　　者：孙文魁 唐新功[1,2] SUN Wenkui;TANG Xingong(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,111 Daxue Road,Wuhan 430100,China;College of Geophysics and Petroleum Resources,Yangtze University,111 Daxue Road,Wuhan 430100,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉市430100 [2]长江大学地球物理与石油资源学院,武汉市430100

出　　处：《大地测量与地球动力学》2023年第9期936-944,共9页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42274087,41874119,42174083)。

摘　　要：以EIGEN-6C4模型布格重力异常数据、V19.1地形数据和CRUST1.0模型地壳数据为基础,采用导纳法和相关函数法联合反演,计算华北地区岩石圈有效弹性厚度(T_(e))。结果表明,华北地区T_(e)值的分布存在明显的横向不均匀性,西部鄂尔多斯地块为高值区,T_(e)厚度约为30~60 km;中部华北平原为低值区,T_(e)厚度约为5~25 km;鲁东黄海地块为中、高值区,T_(e)厚度约为20~50 km。华北克拉通高T_(e)值区与稳定的鄂尔多斯地块相对应,中、低T_(e)值区则对应构造相对活跃的太行山构造带和郯庐断裂带。从T_(e)值与地表热流的关系来看,高T_(e)值区一般对应低热流值区,而低T_(e)值区一般热流值也较高,这与岩石圈厚度和地表热流的一般分布规律一致。从T_(e)与地震的空间分布来看,华北地区的地震活动主要集中在中、低T_(e)值区,表明T_(e)较低的地区稳定性较差,可能更有利于地震的孕育和发生。On the basis of the Bouguer gravity anomaly data of EIGEN-6C4 model,V19.1 terrain data and CRUST1.0 model crustal data,we calculate the effective elastic thickness(T_(e))of lithosphere in north China by the joint inversion method of admittance and correlation function methods.The results show that the T_(e) value in north China has obvious lateral inhomogeneity.The Ordos block is a high value area,and the T_(e) is about 30-60 km.The north China plain is a low value area,and the T_(e) is about 5-25 km.The Ludong-Huanghai block is a middle and high value area,and the T_(e) is about 20-50 km.The high T_(e) value area of the north China Craton corresponds to the stable Ordos block,and the middle and low T_(e) values correspond to the relatively active Taihang mountain tectonic belt and Tanlu fault zone.From the relationship between T_(e) value and surface heat flow,the area with high T_(e) value generally corresponds to the area with low heat flow value,while the area with low T_(e) value generally has high heat flow value,which is consistent with the general distribution law of lithospheric thickness and surface heat flow.According to T_(e) and the spatial distribution of earthquakes,the seismic activity in north China is mainly concentrated in the middle and low value areas of T_(e),indicating that the area with smaller T_(e) has poor stability and may be more conducive to the preparation and occurrence of earthquakes.

关 键 词：岩石圈 有效弹性厚度 华北克拉通 地震活动 地表热流 

分 类 号：P313[天文地球—固体地球物理学]