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
图 5 鄂东南地区布格重力异常及数据处理图
a.鄂东南地区布格重力异常图; b.重力异常小波7阶逼近边界识别图; c.重力异常小波6阶逼近边界识别图; d.重力异常小波5阶逼近边界识别图; e.重力异常小波4阶逼近边界识别图; f.重力异常小波3阶逼近边界识别图
Fig. 5. Diagrams of the Bouguer gravity anomaly and processed anomaly in Southeast Hubei Province
图 2 台阶模型重力异常、水平导数和垂向导数
Fig. 2. Bouguer gravity anomaly/horizontal derivative/vertical derivative of stairstep model
图 6 山坡-枫林断裂构造形成变形示意图
Fig. 6. Schematic diagram of Shanpo-Fenglin fault's distortion and development
图 8 204线连续复小波频谱分析
a.磁异常曲线; b.重力异常曲线; c.平面岩体分布图; d.连续复小波频谱分析
Fig. 8. Continuous complex wavelet time-frequency analysis on line 204
图 9 鄂东南地区地壳地质模型
Fig. 9. Crustal structure and geological model in Southeast Hubei Province
图 12 鄂城-铁山岩体磁化强度反演图
Fig. 12. Diagram of magnetization inversion of Echeng-Tieshan rock mass
图 13 金山店及金山店岩体以南磁化强度反演结果
Fig. 13. Diagram of magnetization inversion in Jinshandian and south Jinshandian
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