Gravity and magnetic field and tectonic structurecharacter in the southern Yellow Sea
- 作者：LIANG Ruicai（梁瑞才）；PEI Yanliang（裴彦良）；ZHENG Yanpeng（郑彦鹏）；WEI Jianwei（魏建伟）；LIU Yanguang（刘焱光）
- 单位1：Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration
- 语种：英文
- 作者关键词：Cenozoic；uplift；basin；tectonic structure
- 起始页：224
- 总页数：11
- 刊名：海注沉积与环境地质国家海洋局重点实验室研究年报
- 是否内版：否
- 主编：石学法；孟宪伟；刘保华
- 期刊索取号：P371.0691672003-2004
摘要
The research of the geophysical survey in the east of the southern Yellow Sea (SYS) (122°～125。E) in 1999 reveals that the SYS has a structure of three-uplifts and two-basins. The struc-ture can be well concordant with the gravity and magnetic anomalies.In the basins,most of the gravi-ty and magnetic anomalies are low and gentle.As well in the uplifts,the gravity anomalies are highpositive ones,but the magnetic anomalies are plus and minus variant ones.Seismic data show that themid-uplift is a Cenozoic one.The Paleozoic is under the Q+N strata,the thickness of which is lessthan lkm,with no Palaeogene.The Wunansha uplift area and the Sunan uplift area have good conti-nuity,which indicates that they belong to the same geological unit.The basin in the northem part ofSYS,which developed in the late Cretaceous period,is a Cenozoic one mainly made up of Cenozoicsediment.On the contrary,the basin in the southem part is the seaward extension of Subei basin andis a medial Cenozoic sediment basin mainly made up of Cenozoic sediment.Because of the striking left-lateral sense translation of Tanlu fault zone,the east plate of fault zone moved northward on a largescale,which generated a massive north-south pull-apart stress field to make the earth crust pulledapart,revolved and tilted,and the pulling-apart basin came into being in the upper part of thecrust.