Geophysical Interpretation of Rock-Controlling Structure and Concealed Rock Mass Features in Southeast Hubei Province
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摘要: 利用小波多尺度分析、边界识别、连续复小波频谱分析、3D磁化强度反演等方法处理解释鄂东南地区重磁资料得出:(1)山坡-枫林超壳断裂北倾,由于印支期与燕山期的改造,浅部断裂在平面上呈"S"形,中西段向南偏移,东段向北偏移.它控制了印支期与燕山期岩体的形成与分布.断裂北盘的鄂城、铁山、金山店及灵乡岩体主要以铁矿为主,而南盘的阳新、殷祖、郭家桥等岩体则以铜多金属为主.(2)深部存在岩浆房,深度约5 km.岩浆通过构造薄弱位置上侵就位,以岩株、岩枝和岩墙的形式构成中浅部和出露岩体.(3)鄂城岩体南、铁山岩体北、金山店岩体南缘东段可能存在隐伏矿体.陈家湾隐伏岩体、金牛-肖家边隐伏岩体、灵乡西段隐伏岩体与碳酸盐地层接触的位置是成矿的有利位置.Abstract: In this paper, wavelet multi-scale analysis/boundary identification method/continuous complex wavelet time-frequency analysis/3D magnetization inversion are used to process and interpret gravity and magnetic data in the southeast Hubei Province. It is found the follows. (1)The Shanpo-Fenglin deeply-penetrating fault is north dipping and shallow part shows shape of "S", of which middle-western section deviates to south and east section deviates to north as a result of transformation in Indo-Chinese epoch and Yanshanian. It has controlled the formation and distribution of rock mass in Indo-Chinese epoch and Yanshanian. Echeng/Tieshan/Jinshandian/Lingxiang rock masses are dominated by iron ore on the north. Yangxin/Yinzu/Guojiaqiao rock masses are dominated by copper polymetallic ore on the south. (2) Magma chamber is located in deep, with a depth of about 5 km. Magma intruded upward and emplaced through weakness structure, which formed mid-shallow and exposed rock mass in the shape of bead/apophyses/dike. (3) There may exist concealed ore body in south of Echeng rock mass/north of Tieshan rock mass/east part of the south margin of Jinshandian rock mass. The areas where Chenjiawan exposed rock mass/Jinniu-Xiaojiabian exposed rock mass/west of Lingxiang exposed rock mass are in contact with carbonate beds are favourable for mineralization.
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图 1 鄂东南地区岩浆岩分布
1.出露岩体;2.隐伏岩体及其编号;3.超壳断裂;4.分界线;5.岩体测年数据;6.研究区范围;①.嘉鱼隐伏岩体;②.金牛隐伏岩体;③.矿林咀隐伏岩体;④.鄂城-铁山岩体边部隐伏岩体;⑤.章山隐伏岩体;⑥.张洪桥隐伏岩体;⑦.阳新岩体北缘隐伏岩体;⑧.龙角山隐伏岩体;⑨.郭家桥隐伏岩体.据周安保等(2013)修改,图中虚线框为本次的研究区
Fig. 1. Distribution map of rock mass in Southeast Hubei Province
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