Exploring deep concealed ore bodies based on gravity anomaly separation;methods: A case study of the Nihe iron deposit

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	Exploring deep concealed ore bodies based on gravity anomaly separation;methods: A case study of the Nihe iron deposit
	Liu Yan 3; Yan Jia-Yong ; Wu Ming-An ; Zhao Wen-Guang ; Zhao Jin-Hua ; Deng Zhen
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2012
卷号	55 期号:12 页码:4181-4193
关键词	Gravitational anomaly field Data processing Anomaly separation Concealed deposit
ISSN号	065LD
英文摘要	Gravity anomalies are responses of multiple inhomogeneous geologic bodies of different scales, different patterns and different depths, which are difficult to be accurately separated. According to method principles, model tests and application to the Nihe iron deposit, this article compared five gravity anomaly separation methods. It is explained that trend analysis is global fitting other than least squares smoothing. As trend analysis fits the regional field by polynomial, it is not used for large complex geologic areas. Based on interpolation operation of the calculation field values and the four average circles for cutting operator, the interpolating cut method gets the regional field and the local field through continuous cutting. The interpolating cut method is suitable for small areas and single gravity anomalies, in which 1 to 2 times of cutting is good. By analysis of power spectrum of observed gravity, choosing suitable wave bands and building low-pass & band-pass filter, matched filtering can extract different wave anomaly fields. It is fit for vertical stack anomalies. According to the potential field data of a surface, analytic continuation makes another different height potential field, in which continuation height is very important. Vertical direction second derivative Can highlight shallow gravity anomalies, distinguish horizontal stacked anomalies, determine the boundaries of anomalies, and eliminate or weaken the background field effect. These methods are successfully applied to the gravity anomaly separation of the Nihe iron deposit in the middle and lower Yangtze River, and two new clues of iron ore bodies are found which lie in the northeast and southeast of Nihe.
学科主题	地球物理勘探
WOS关键词	CONTINUATION ; FIELD ; DISTRICT ; LUJIANG ; ANHUI
WOS研究方向	Geochemistry & Geophysics
语种	中文
WOS记录号	WOS:000313148900029
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39526]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China. 2.Geol Survey Anhui Prov, Hefei 230001, Peoples R China. 3.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Liu Yan,Yan Jia-Yong,Wu Ming-An,et al. Exploring deep concealed ore bodies based on gravity anomaly separation;methods: A case study of the Nihe iron deposit[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2012,55(12):4181-4193.
APA	Liu Yan,Yan Jia-Yong,Wu Ming-An,Zhao Wen-Guang,Zhao Jin-Hua,&Deng Zhen.(2012).Exploring deep concealed ore bodies based on gravity anomaly separation;methods: A case study of the Nihe iron deposit.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,55(12),4181-4193.
MLA	Liu Yan,et al."Exploring deep concealed ore bodies based on gravity anomaly separation;methods: A case study of the Nihe iron deposit".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 55.12(2012):4181-4193.