摘要
雷琼地区系广东省雷州半岛和海南岛的简称。以王五-文教断裂为界,本区可分为两部分:北部的雷州半岛和琼北,通称“雷琼坳陷”,为新第三纪和早更新世大幅度沉降区,兼有剧烈而频繁的火山活动和地震活动,是本文讨论的重点;南部是以五指山为中心的隆起区,发育多级剥夷面,由隆起中心向海呈阶梯状下降,该区隆起幅度虽大,却基本上没有火山活动,地震活动亦弱(图1)。本文根据若干典型的第四系剖面、火山活动、^(14)C测年数据、测震及地形变等资料,初步探讨雷琼地区新构造运动的基本特征。
In this paper based on the studies on the Cenozoic stratigraphy,geomorphology,volcanic activities and tectonic deformation in the Lei(Leizhou Peninsula)-Qiong(Hainan Island)area,characteristics and units of neotectonic movement are described as follows:1.The Lei-Qiong area is divided into two parts in terms of the neotectonic,the Lei-Qiong faulting trap and the Qiongzhongnan(the central and southern parts of the Hainan Island)arch-faulting uplift.The former is the most strong one in the Lei-Qiong area for neotectonic movement.Its largest thickness of the Cenozoic strata is over 1500m,and about half of this region is covered by the volcanic rocks,and it is a strong earthquake,area.2.The regional stress field controlling the neotectonic movement of this area is a pair of normal compress stress with N-S trending,of which the force source may be related to the changes of the earth’s crust rotation rate,or may be resulted from spreading of the South China Sea basin which caused the earth’s crust to push the mainland of its northern side.
作者
张虎男
赵希涛
Zhang Hunan;Zhao Xitao(Seismological Bureau of Guangdong Province,Guongzhou;Institute of Geology,Academia Sinica,Beijing)
出处
《地质科学》
1984年第3期276-287,共12页
Chinese Journal of Geology(Scientia Geologica Sinica)
