| 胶东金矿成矿深度的构造校正测算及成矿预测 |
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| 引用本文： | 吕承训,张达,许亚青,郭涛,王宗永,霍庆龙,袁月蕾.胶东金矿成矿深度的构造校正测算及成矿预测[J].地学前缘,2022,29(1):427-438. |
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| 作者姓名： | 吕承训 张达 许亚青 郭涛 王宗永 霍庆龙 袁月蕾 |
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| 作者单位： | 1.中国地质调查局发展研究中心, 北京 1000372.中国地质大学(北京) 地球科学与资源学院, 北京 1000833.贵州省煤矿地质工程咨询与地质环境监测中心, 贵州 贵阳 5500014.中国地质科学院 地质力学研究所, 北京 1000815.兰州财经大学 财税与公共管理学院, 甘肃 兰州 7300206.河北省众联能源环保科技有限公司, 河北 石家庄 0500117.中国科学院 地理科学与资源研究所, 北京 100101 |
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| 摘 要： | 成矿深度测算对于矿床学理论研究和深部找矿都有重要意义。经典的成矿深度“压力/比重”计算方法,缺乏考虑构造应力在成矿过程中的影响。前人按照“压力/比重”的计算方法,提出胶东蚀变岩金矿是6 000~8 000 m深的元古宙成矿,石英脉型金矿是深度在3 000 m左右的中生代成矿,并据此建立了金矿垂直五层楼的分带模式。依据该模式指导的深部预测勘查效果不好。“成矿深度构造校正测算”是近几十年逐渐成长起来的一个新方法,即先减去“构造附加压力”后再进行成矿深度测算。本文介绍“成矿深度构造校正测算”的计算方法,指出其应用条件和预测意义。开展成矿深度构造校正测算需要以下条件:(1)确定成矿模式;(2)开展野外构造变形岩相测量;(3)测量岩石矿物应变,恢复成矿构造应力场,计算构造附加静水压力;(4)测算成矿深度。根据“成矿深度构造校正测算”方法已经获得胶东多个典型金矿成矿深度的测算结果:(1)夏甸金矿成矿深度为-1 979.51~-3 014.72 m;(2)焦家金矿成矿深度为-1 632.4~-2 331.6 m;(3)大尹格庄金矿成矿深度为-2 775.4~-4 164.5 m;(4)新城金矿成矿深度为-1 781.29~-2 750.0 m;(5)玲珑金矿成矿深度为-720.55~-3 454.97 m。根据以上典型金矿成矿深度的测算结果,本文认为胶东金矿属于深-1 000~-4 500 m的浅成热液剪切带型矿床,由此推断胶东典型金矿矿体主要部分仍然赋存在深部。按照“构造校正测算”方法得到的成矿深度,结合地质、物探和化探信息,预测金矿发育“深部第二富集带”,已经得到胶东金矿勘查工作的证实。
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| 关 键 词： | 成矿深度 构造校正测算 构造变形岩相 胶东金矿 |
| 收稿时间： | 2020-12-01 |
Calculation of metallogenic depth in the Jiaodong gold deposits: Tectonic correction method and metallogenic prediction |
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| L Chengxun,ZHANG Da,XU Yaqing,GUO Tao,WANG Zongyong,HUO Qinglong,YUAN Yuelei.Calculation of metallogenic depth in the Jiaodong gold deposits: Tectonic correction method and metallogenic prediction[J].Earth Science Frontiers,2022,29(1):427-438. |
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| Authors: | L Chengxun ZHANG Da XU Yaqing GUO Tao WANG Zongyong HUO Qinglong YUAN Yuelei |
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| Institution: | (Development and Research Center of China Geological Survey,Beijing 100037,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Guizhou Coal Mine Geological Engineering Consulting and Geological Environmental Monitoring Center,Guiyang 550001,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;School of Finance,Taxation and Public Administration,Lanzhou University of Finance and Economics,Lanzhou 730020,China;Hebei Zhonglian Energy and Environmental Protection Technology Co.,Ltd.,Shijiazhuang 050011,China;Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China) |
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| Abstract: | Metallogenic depth calculation is of great significance to ore deposit theory research and deep ore prospecting. The classical “pressure/specific gravity” calculation method, however, dose not consider the influence of tectonic stress on the mineralization process. Using this classical method, previous researchers had proposed the Jiaodong altered rock type gold deposit was Proterozoic metallogenic deposit with a depth of 6000-8000 m, and the quartz vein type gold deposit was Mesozoic metallogenic deposit located below 3000 m. However, guided by a five-story vertical zoning model established according to the calculation, the actual deep prospecting exploration was not successful. In recent years a new calculation method has been developed gradually, it uses tectonic correction in metallogenic depth calculation by canceling out additional tectonic stress before calculating metallogenic depth. In this paper, we introduce this new method, point out its application conditions and discuss its prediction significance. The application protocol entails (1) determining the metallogenic pattern; (2) conducting field survey on the tectonic deformation lithofacies; (3) measuring the rock/mineral strain, restoring the metallogenic-tectonic stress field, calculating the additional hydrostatic pressure due to tectonic stress; and (4) calculating the metallogenic depth. Using this method, the metallogenic depths of several typical gold deposits in Jiaodong were calculated and the results are: (1) Xiadian, 1979.51-3014.72 m; (2) Jiaojia, 1632.4-2331.6 m; (3) Dayingezhuang, 2775.4-4164.5 m; (4) Xincheng, 1781.29-2750.0 m; and (5) Linglong, 720.55-3454.97 m. Accordingly, the Jiaodong gold deposits are considered belonging to the epithermal shear zone type deposit with a metallogenic depth of 1000-4500 m. Therefore, it is inferred that the main orebody of the typical gold deposits in Jiaodong remains buried in the deep. Combined with the geological, geophysical and geochemical exploration information, we predicted a “second deep enrichment metallogenic zone” of gold deposit in Jiaodong, and this prediction has been confirmed by deep ore exploration effect. |
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| Keywords: | metallogenic depth tectonic metallogenic depth correction calculation tectonic deformed lithofacies gold deposit in Jiaodong |
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