Gravity-magnetic response of the islands and seamounts of South China;Sea

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局广州海洋地质调查局

	Gravity-magnetic response of the islands and seamounts of South China;Sea
	Chen Jie; Zhu Ben-Duo; Wen Ning; Wan Rong-Sheng
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2012
卷号	55 期号:9 页码:3152-3162
关键词	South China Sea seabed topography gravity anomaly Delta Z(perpendicular to) magnetic anomaly basic extrusive rock seamounts granite and metamorphic rock seamounts
ISSN号	017YZ
英文摘要	The geophysical research of seamounts and islands and other geomorphologic units of South China Sea (SCS) is of particular significance for revealing the geologic history of SCS, utilizing islands properly, solving the problem of resources shortness, constructing coastal defense and so on. But in the past, the number of lines of geophysical survey was not adequate to cover the whole SCS, and quality of these geophysical data was not as high as today because of technological limit. In recent years, new data of multibeam, gravity, magnetic and other marine geophysics with higher quality are surveyed and the lines of geophysical survey are dense around SCS. In this paper, new geophysical data of SCS by ship-survey, satellite-survey and aerial-survey from these years are integrated in order to reveal more reliable geophysical background of SCS. Here, diurnal variation data of onshore geomagnetic stations are used to calibrate the magnetic survey data in SCS. And new processing technology which has been tested in National High Technology Research and Development Program ("863" Program in China) is also adopted during our work. In our study, new result has been obtained for islands and seamounts from their geophysical and lithological data. That is, islands and seamounts can be divided into three kinds according to their different geophysical features and lithological properties: 1) The islands and sea mounts magnetism sea mounts which have high value of gravity anomaly, Delta Z perpendicular to magnetic anomaly, density and are mainly composed of basic extrusive rocks (mainly basalt); 2) The islands and which have high value of gravity anomaly and low value of Delta Z perpendicular to magnetic anomaly are basically composed of granite and metamorphic rocks; 3) The islands and seamounts which have high value of gravity anomaly and fluctuating value of Delta Z perpendicular to magnetic anomaly which means somewhere has high value but somewhere has low value are composed of granite, metamorphic rocks mixed with volcanic eruption rock. The regular distribution of seamounts in SCS indicates that the formation of SCS is probably related to differentiation of blocks of SCS. This is the first research achievement of the comprehensive research of islands and seamounts in SCS by combining their geophysical data with lithological data.
学科主题	海洋地质学
WOS关键词	ANOMALIES
WOS研究方向	Geochemistry & Geophysics
语种	中文
WOS记录号	WOS:000309628400033
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39495]
专题	中国地质调查局广州海洋地质调查局
作者单位	Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China.
推荐引用方式 GB/T 7714	Chen Jie,Zhu Ben-Duo,Wen Ning,et al. Gravity-magnetic response of the islands and seamounts of South China;Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2012,55(9):3152-3162.
APA	Chen Jie,Zhu Ben-Duo,Wen Ning,&Wan Rong-Sheng.(2012).Gravity-magnetic response of the islands and seamounts of South China;Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,55(9),3152-3162.
MLA	Chen Jie,et al."Gravity-magnetic response of the islands and seamounts of South China;Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 55.9(2012):3152-3162.