Study of crustal thickness and poisson’s ratio of the south of erenhot area by teleseismic receiver function
Study of crustal thickness and poisson’s ratio of the south of erenhot area by teleseismic receiver function
复制标题
二连浩特地区南部地壳厚度及泊松比的远震接收函数研究
DOI：
10.29382/eqs-2018-0000-00
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Cheng Li
中科院分区：
文献类型：
--
作者：
Lei Jiang;Yonghong Duan;Yanna Zhao;Yong Qi;Cheng Li
The Xing’an Mongolian Orogenic Belt(XMOB) and the northern margin of North China Craton(NCC) have undergone multistage tectonic superimposition and the tectonic evolution is extremely complicated. We collect the teleseismic data of 44 temporary broadband seismic stations deployed in the XMOB and the northern margin of NCC to calculate the P wave receiver functions. The crustal thickness and average crustal ratio as well as the Poisson’s.ratios beneath 33 stations are estimated using the H-κ stacking method. The results show: (1) The crustal thickness of the study area ranges from 38.7 to 42.7 km, with an average thickness of 41.2 km. There is a great difference in crustal thickness on both sides of Solonker suture zone. The characteristics of crustal thickness support the geodynamic model that the Paleo-Asian Ocean subducted and closed at the Solonker suture zone. (2) The Poisson’s ratios in the study area are low, ranging from 0.215 to 0.277, with an average value of 0.243, suggesting that the rock composition of the.area is dominated by felsic-acid rocks. (3) There exists a negative correlation between the Poisson’s ratio and the crustal thickness. Combined with the lower values of Poisson’s ratio, we speculate that the delamination is the major mechanism in crustal extension and thinning in the study area.
