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| Metallogenic prospect prediction and 3D geological modeling for the Tonglyushan ore field |
LIU Bao( ), YANG Yu-Shan(), LIU Tian-You |
| School of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan 430074, China |
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Abstract The Tonglvshan ore field is the most important skarn copper-iron-gold polymetallic ore field in the southeastern Hubei ore concentration area. Since its mineralization is closely related to Tonglvshan stocks, ascertaining the deep distribution and morphologies of these stocks and their contact relationship with surrounding limestones and marbles holds great significance for deep prospecting prediction of the ore field. This study first conducted a detailed analysis of the gravity and magnetic anomaly combinations of the Tonglvshan pluton and stocks; limestones and marbles, as well as their xenoliths; and skarn ore bodies and mineralized bodies. Accordingly, this study inferred the boundary of the Tonglvshan pluton and delineated the xenoliths and mineralized bodies of limestones and marbles within the Tonglvshan pluton. Then, this study conducted the 3D geological modeling based on the results from the 3D physical property inversion and 2.5D and 3D gravity-magnetic human-computer interaction inversion, as well as the drilling and geological data. Finally, this study established a 3D geological model for the plutons and mineralized bodies at depths of 4000 m and below in the Tonglvshan ore field, providing a basis for target delineation and deep prospecting prediction.
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Received: 15 August 2022
Published: 11 October 2023
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Regional teotonic map (a) and geological map (b) of Tonglyushan ore field
F1—Echeng-Xianning supershell fault;F2—Xiangfan-Guangji supershell fault;F3—Jiangqiao-Xialu fault; F4—Jiangnan Belt fault;F5—Maopu-Liangjianqiao fault;F6—Shanpo-Fenglin supershell fault;X1—Daye Lake syncline;Y1—Echeng rock mass;Y2—Tieshan rock mass;Y3—Jinshandian rock mass;Y4—Lingxiang rock mass;Y5—Yinzu rock mass;Y6—Yangxin rock mass;L01~L55—represents 55 sections for inversion
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Physical properties of main rocks in Tonglyushan ore field(The data comes from the First Geological Team of Hubei Province,2014[17])
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Aero magnetization pole anomaly (a) and Bouguer gravity anomaly (b) in Tonglyushan ore field
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Wavelet transform of Bouguer gravity anomaly in Tonglyushan ore field with order 2~4 details
a—Bouguer gravity anomaly wavelet transform 2 order details; b—Bouguer gravity anomaly wavelet transform 3 order details; c—Bouguer gravity anomaly wavelet transform 4 order details
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Wavelet transform of magnetic anomaly of Tonglyushan ore field with order 2~4 details
a—polarization magnetic anomaly wavelet transform 2 order details; b—polarization magnetic anomaly wavelet transform 3 order details; c—polarization magnetic anomaly wavelet transform 4 order details
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12TL line integrated interpretation section
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Prospect area of xenoliths in Tonglyushan ore field
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Second order detail interpretation of polarization magnetic anomaly wavelet transform
(the green area shows the Bouguer gravity anomaly wavelet transform with 1+2 order details and gravity height above 0 mGal)
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Integrated geophysical interpretation section
a—comprehensive geophysical interpretation section of line 13; b—comprehensive geophysical interpretation section of line B15; c—comprehensive geophysical interpretation section of line C27
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Results of physical property inversion and human-computer interaction inversion
a—3D inversion of magnetic susceptibility; b—3D density inversion result; c—2.5D/3D gravity and magnetic human-machine interaction inversion result
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Three-dimensional rock mass model of Tonglyushan ore field
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Different view of Tonglyushan main body rock mass
a—southeast view ; b—southwest view
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