铜绿山矿田成矿远景预测及三维地质模型

doi:10.11720/wtyht.2023.1398

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摘要

铜绿山矿田是鄂东南矿集区最重要的矽卡岩型铜铁金多金属矿田,其成矿与铜绿山岩株体关系密切。因此,查明该岩体深部展布和形态及其与周缘灰岩大理岩的接触关系,对矿田深部找矿预测具有十分重要的意义。笔者在细致分析铜绿山岩体及岩株体、灰岩大理岩及捕虏体、矽卡岩矿体及矿化体等重磁异常组合特征的基础上,推测铜绿山岩体的边界,圈定铜绿山岩体内部灰岩大理岩捕虏体和矿化体,利用三维物性反演、2.5D重磁人机交互反演、3D重磁人机交互反演结果,结合钻孔、地质资料开展三维地质建模,获得了铜绿山矿田4 000 m以浅的岩体、矿化体的三维地质模型,为该区的靶区圈定及深部找矿预测提供依据。

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	刘豹
	杨宇山
	刘天佑

关键词 ：铜绿山矿田, 三维地质建模, 人机交互反演, 捕虏体

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.

Key words： Tonglvshan ore field 3D geological modeling human-computer interaction inversion xenolith

收稿日期: 2022-08-15 修回日期: 2023-02-06 出版日期: 2023-08-20

ZTFLH:

P631

基金资助:国家自然科学基金面上项目“基于多点地质统计学的重磁三维随机反演方法研究”(41974152)

通讯作者: 杨宇山(1977-),男,副教授,主要从事重磁资料处理与解释方面的教学与科研工作。Email:samyys@126.com

作者简介: 刘豹(1996-),男,在读硕士,主要从事重磁资料的处理与解释及三维地质建模工作。Email:LiuB@cug.edu.cn

引用本文:

刘豹, 杨宇山, 刘天佑. 铜绿山矿田成矿远景预测及三维地质模型[J]. 物探与化探, 2023, 47(4): 906-915.
LIU Bao, YANG Yu-Shan, LIU Tian-You. Metallogenic prospect prediction and 3D geological modeling for the Tonglyushan ore field. Geophysical and Geochemical Exploration, 2023, 47(4): 906-915.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1398 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I4/906

Fig.1 铜绿山矿田区域构造(a)及地质(b)
F₁—鄂城-咸宁超壳断裂;F₂—襄樊-广济超壳断裂;F₃—姜桥-下陆断裂;F₄—江南带断裂;F₅—毛铺-两剑桥断裂;F₆—山坡-枫林超壳断裂;X1—大冶湖向斜;Y₁—鄂城岩体;Y₂—铁山岩体;Y₃—金山店岩体;Y₄—灵乡岩体;Y₅—殷祖岩体;Y₆—阳新岩体;L01~L55—反演的55条剖面位置

Table 1 铜绿山矿田主要岩(矿)石物性(据湖北省第一地质大队,2014^[17])

Fig.2 铜绿山矿田航磁化极异常(a)和布格重力异常(b)

Fig.3 铜绿山矿田布格重力异常小波变换2~4阶细节
a—布格重力异常小波变换2阶细节;b—布格重力异常小波变换3阶细节;c—布格重力异常小波变换4阶细节

Fig.4 铜绿山矿田化极磁异常小波变换2~4阶细节
a—化极磁异常小波变换2阶细节;b—化极磁异常小波变换3阶细节;c—化极磁异常小波变换4阶细节

Fig.5 12TL线综合解释剖面

Fig.6 铜绿山矿田捕虏体远景区预测

Fig.7 化极磁异常小波变换二阶细节解释
(绿色区域为布格重力异常小波变换1+2阶细节0 mGal以上重力高)

Fig.8 地球物理综合解释剖面
a—13线地球物理综合解释剖面;b—B15线地球物理综合解释剖面;c—C27线地球物理综合解释剖面

Fig.9 3D物性反演和2.5D/3D人机交互反演结果
a—磁化率3D反演结果;b—密度3D反演结果;c—2.5D/3D重磁人机交互反演结果

Fig.10 铜绿山矿田三维岩体模型

Fig.11 铜绿山主体岩体不同角度视
a—东南视角;b—西南视角

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