江汉洞庭盆地及邻区晚中生—新生代以来的构造变形

TECTONIC DEFORMATION OF THE JIANGHAN-DONGTINGBASIN AND ITS SURROUNDING AREAS FROMLATE MESOZOIC TO CENOZOIC

本文利用构造分析结果、震源机制解和现场应力测量资料 ,获得了江汉洞庭盆地及邻区晚白垩世末至早第三纪、早第三纪末至中新世初、上新世末至第四纪和现今四个时段构造应力场主应力(σ1、σ2 和σ3)的优势分布。认为其运动学机制 ,可能受太平洋板块向北西西俯冲。

By using the results of tectonic analysis and focal mechanism solution and site geo-stress survey,we get the predominant distribution of the principal stress(σ1,σ2 and σ3)of the tectonic stress field in the Jianghan-Dongting basin and its surrounding areas in four periods:from the end of the Late Cretaceous to the Paleogene,from the Paleogene to the beginning of the Miocene,from the end of the Pliocene to the Quaternary and at present.The kinematic mechanisms are controlled by the conjoint effect:the Pacific plate subducts and converges towards WNW and the Indian plate pushes northwards,leading to the uplift of the Qinghai-Tibet Plateau.