| 云南个旧高松矿田花岗岩侵位形态复杂度与矿体产出定量评价 |
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| 引用本文：芦磊,江小均,刘潇,毛杜,郑位.2023.云南个旧高松矿田花岗岩侵位形态复杂度与矿体产出定量评价[J].地球学报,44(6):1076-1086. |
| DOI：10.3975/cagsb.2022.111701 |
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| 基金项目:自然资源部三江重点实验室开放课题项目(编号: ZRZYBSJSYS2021001);云南科技计划昆明理工大学“双一流”科技专项项目(编号: 202202AG050006);云南锡业股份有限公司校企合作项目(编号: GF-2021-14) |
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| 中文摘要:个旧燕山晚期花岗岩侵入形成了接触带矽卡岩型和蚀变花岗岩型矿床, 矿床产出与花岗岩侵位形态有一定的成因关系。近年来随着三维定量预测方法的不断发展, 对隐伏矿体定位及定量预测具有较大的促进作用。本文在前人工作的基础上, 首先总结了高松矿田花岗岩的整体分布、埋深情况和接触带硫化矿体产出特征及成矿规律, 其次利用坑道地质编录、钻探数据库等资料建立矿田矿体、岩体的高精度三维曲面模型, 采用面积、梯度和散度系数等作为花岗岩三维形态指标, 最终计算其与矿体矿石量、含量的相关系数, 定量评价花岗岩侵位形态复杂度与矿体产出关系。认为复杂的花岗岩形态有利于矿体的形成, 高峰山矿段相关性最大, 大箐东矿段其次, 阿西寨矿段最弱, 并且类比分析表明芦塘坝断裂下盘东部凹陷带散度系数分布和大箐东突起相似, 具有一定的找矿前景。本文提出一种基于三维地质模型信息和相关性分析技术的成矿定量评价方法, 在同类型岩浆热液矿床深部和外围隐伏矿预测方面具有一定的地质找矿的指导意义。 |
| 中文关键词:个旧 高松矿田 侵位形态复杂度 矿体产出 相关系数 |
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| Quantitative Evaluation of the Granite Emplacement Morphological Complexity and Ore-body Output in the Gaosong Ore Field, Gejiu Tin Polymetallic Deposit, Yunnan Province |
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| Abstract:The emplacement of Late Yanshanian Gejiu granite results in the formation of skarn-type and altered granite-type deposits. The occurrence of these deposits has a specific genetic relationship with the emplacement form of granite. In recent years, the continuous development of three-dimensional (3D) quantitative prediction methods has played a significant role in promoting the positioning and quantitative prediction of concealed ore bodies. Based on previous work, we first determined the overall distribution and burial depth of granite in the Gaosong ore field and the occurrence characteristics and metallogenic pattern of sulfide ore bodies in the contact zone. We then established high-precision 3D surface models of ore bodies and rock masses in the ore field in combination with tunnel logging and drilling databases. The area, gradient, and divergence coefficient were taken as the three-dimensional shape indicators of granite. Finally, we calculated the correlation coefficient between these indicators and the ore volume and grade of the ore bodies. We then quantitatively evaluated the relationship between the morphological complexity of emplaced granite and the occurrence of ore bodies. We argue that the complex granite shape is conducive to the formation of the ore bodies. The correlation was highest in the Gaofengshan ore section, followed by the Daqingdong ore section, and was weakest in the Axizhai ore section. In view of the abovementioned findings, we believe that the distribution of divergence coefficients is similar in the eastern depression zone of the footwall of the Lutangba fault and the uplift zone of Daqingdong, indicating that a particular prospecting potential. We developed a quantitative mineralization evaluation method based on 3D geological model information and correlation analysis technology. This method has certain guiding significance for the prediction of deep and peripheral concealed ore deposits of the same type of magmatic hydrothermal deposits during geological prospecting. |
| keywords:Gejiu Gaosong ore-field emplacement morphological complexity ore-body occurrence correlation coefficient |
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