凤凰山矿田成矿地质体三维结构与控矿地质因素分析
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国家科技攻关计划,国家重点基础研究发展计划(973计划)


Three-dimensional Structure of Metallogenic Geologic Bodies and Ore-controlling Geological Factors in Fenghuangshan Ore Field
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    摘要:

    安徽铜陵凤凰山铜矿正面临资源保有程度严重不足的问题,建立凤凰山矿田成矿地质体三维结构和控矿地质因素模型,开展矿田深部隐伏矿体立体定位预测具有重要的现实意义。凤凰山矿田矿床矿体的定位主要受接触带和断裂构造的复合控制,新屋里岩体与围岩呈侵入接触,局部地段超覆于围岩之上,接触带的形态和产状控制了矿体的空间分布。在分析矿田地质特征及与成矿关系的基础上,采用三维地质建模技术构建新屋里岩体、接触带、地层和张性断层等地质体的三维结构栅格模型。地质体三维结构模型表明,新屋里岩体结构复杂,向东南方向延伸,有大量的剧烈弯曲变形,向北东方向呈扇形;岩体与围岩的接触带构造控制了矿体的产出位置和空间分布;地层结构是一复式向斜;断层结构主要为4条走向北西的横向张性断层。采用数学形态学和欧氏距离变换相结合的方法,基于栅格模型对新屋里岩体的形态结构进行滤波分解和几何分析,获得岩体的二级趋势与二级起伏等结构成分。利用空间分析方法建立岩体热力场因素(dG)、岩体形态因素(wr1G、wr2G)、褶皱构造因素(dD3)和横向张性断层因素(dF)的三维栅格模型,制作散点图统计数据得到控矿地质因素与矿化指标的关联关系,以三维栅格模型表达矿化富集空间及其立体单元。地质体结构模型和控矿地质因素栅格模型可以描述各种地质体和控矿地质作用在空间中的分布,分析地质体三维结构、控矿地质因素与矿化空间分布的关联关系,为隐伏矿体立体定位预测提供空间分析依据和三维可视化模型。

    Abstract:

    The Fenghuangshan copper mine in Tongling of Anhui province is confronted with a serious shortage of resources, so it is urgent to build the three-dimensional structure models of geologic bodies, analyze ore-controlling geological factors and then make stereotactic and localization prognosis on deep concealed ore bodies. The localization of Fenghuangshan ore deposits and ore bodies is mainly in the compound control of the contact zone and the fault structures, where the Xinwuli magmatic body is intrusively in contact with the surrounding rocks, parts of the zone overlap on surrounding rocks, and the shape and occurrence of the contact zone controls the spatial distribution of ore bodies. Based on analyzing the ore field’s geological characteristics and mineralization, the 3D structure raster models of the Xinwuli magmatic body, the contact zone, strata and tensional faults were built by using the 3D geological modeling technology. The 3D structure models of geologic bodies show that the structure of Xinwuli magmatic body is complex, extending to the southeast, having a lot of severe bending, and being fanned in the northeast; the contact zone of the magmatic body and the surrounding rocks controls the occurrence and spatial distribution of ore bodies; the structure of strata is a compound syncline; and the fault structures are four transverse tensional faults stretching northwest. Based on the raster models, combining mathematical morphology with Euclidean distance transformation, the structure of the Xinwuli magmatic body were filtered, decomposed and analyzed geometrically, and then the 2 levels trend components and the 2 levels undulate components of the magmatic body were acquired. The 3D raster models of the thermal field factor (dG), the morphological factors (wr1G and wr2G), the fold structure factor (dD3) and the transverse tensional fault factor (dF) were built by the spatial analysis method and used to express the mineralization enrichment space and its stereoscopic units by means of making scatter diagrams and statistic analysis to get the relation between the ore-controlling geological factors and the mineralization indicators. The raster models of geologic bodies and ore-controlling geological factors could describe the distribution of geologic bodies and ore-controlling geological process in space, analyze the relationship among 3D structure of geologic bodies, ore-controlling geological factors and spatial distribution of mineralization, and provide the spatial analysis and 3D visualization models for stereoscopic prognosis on deep concealed ore bodies.

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毛先成,唐艳华,赖健清,邹艳红,陈进,彭省临,邵拥军.2011.凤凰山矿田成矿地质体三维结构与控矿地质因素分析[J].地质学报,85(9):1507-1518.
Mao Xiancheng.2011. Three-dimensional Structure of Metallogenic Geologic Bodies and Ore-controlling Geological Factors in Fenghuangshan Ore Field[J]. Acta Geologica Sinica,85(9):1507-1518.

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  • 收稿日期:2011-03-29
  • 最后修改日期:2011-03-29
  • 录用日期:2011-04-01
  • 在线发布日期: 2011-09-07
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