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南黄海磁性基底特征分析和综合解释
邢涛,张训华,张向宇
广州海洋地质调查局资料处理研究所,青岛海洋地质研究所,广州海洋地质调查局资料处理研究所

摘要:

本文利用南通幅区域地质调查的重磁异常数据, 在重磁异常特征分析的基础上, 采用一维频谱分析法对南黄海进行磁性基底反演。结果表明: 南黄海属于扬子块体向海域的延伸, 具有元古代结晶基底和古生代褶皱基底的双基底结构, 其磁性基底深度在2—10km之间变化, 是褶皱基底与磁性层最小埋深的结合, 在坳陷和隆起上表现不同。通过利用综合地质和地球物理综合方法, 对南黄海区域的四大构造单元华北—狼林地块、扬子—京畿地块、华南—岭南地块、东海大陆架进行重磁异常变化特征和磁性基底特征分析, 为研究区断裂等区域构造特征解释提供了依据。

关键词: 南黄海磁性基底重磁异常一维频谱分析

DOI：10.11693/hyhz20131100169

分类号:

基金项目:国土资源部海底矿产资源重点实验室开放基金, KLMMR-2013-A-30 号; 天然气水合物专项数据库建设及战略研究,GZH201100312 号

MAGNETIC BASEMENT AND STRUCTURE OF THE SOUTHERN YELLOW SEA

XING TAO,Zhang Xunhua and Zhang Xiangyu

Guangzhou Marine Geological Survey,Qingdao Institute of Marine Geology,Qingdao,Guangzhou Marine Geological Survey

Abstract:

We studied the magnetic basements in the southern Yellow Sea by gravity and magnetic data inversion, and analyzed the rock magnetism. One-dimensional spectrum analysis was used in the inversion. The depths of magnetic basement were calculated and the contours drawn. The southern Yellow Sea is the marine extension of the Yangtze Block in tectonics, and features two-layered basement that composed of the Proterozoic crystalized layer and the Paleozoic folded layer. The magnetic basements are the combination of the folded basement and the top magnetosphere in depth range of 2—10km, which reflects the regional tectonic framework, and provided basic information on geological structure of the area.

Key words: Southern Yellow Sea magnetic basement gravity and magnetic anomaly one-dimensional spectrum analysis

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