| 山东省莱州曲家金矿区原生晕立体地球化学模型及对元素迁移和深部找矿的启示 |
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| 引用本文：杨德平,于学峰,王林钢,熊玉新,刘鹏瑞,舒磊,宋英昕,朱学礼,牛志力.2020.山东省莱州曲家金矿区原生晕立体地球化学模型及对元素迁移和深部找矿的启示[J].地球学报,41(6):899-918. |
| DOI：10.3975/cagsb.2020.102801 |
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| 作者 | 单位 | E-mail | | 杨德平 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | 1062319799@qq.com | | 于学峰 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 王林钢 | 山东黄金地质矿产勘查有限公司 | | | 熊玉新 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 刘鹏瑞 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 舒磊 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 宋英昕 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 朱学礼 | 山东黄金地质矿产勘查有限公司 | | | 牛志力 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | |
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| 基金项目:国家重点研发计划项目(编号: 2016YFC0600600) |
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| 中文摘要:与热液活动有关的矿床多数伴有原生晕的形成, 其本质是元素的迁移和扩散, 原生晕成分分带和浓度分带特征的研究对于找矿有重要意义, 而立体地球化学建模是近年来兴起的新的原生晕研究方法。曲家金矿和招贤勘查区北部位于胶东焦家金矿带中段, 为新城金矿和马塘金矿向深部的延伸。曲家金矿矿体赋存标高–607 ~ –1466 m, 最大勘查深度1600 m, 招贤勘查区矿体赋存标高–1330～–2170 m, 最大勘查深度2268 m, 在这一地区开展原生晕立体地球化学建模研究具有得天独厚的条件。为此采集了曲家金矿南部腾家矿段的33个钻孔和西侧相邻的招贤勘查区的6个钻孔的1130件岩心样品, 分析测试了34个元素, 用Micromine软件建立了原生晕立体地球化学模型, 建模标高0～–1810 m。模型显示Au、Ag、Cu、Pb、As、Sb、Bi、Hg、Mo、W、S、Co、Ni、V、Cr、Ba、Sr、Cl、F、Se、Fe2O3、K2O、CaO、MgO等元素高值区域主要沿焦家断裂带分布, 表明这些元素的迁移富集由成矿热液沿断裂破碎带活动引起, 其中Ni、Co、Sb、Ba、F等元素趋向在断裂带较深部位富集, 而K2O则趋向在较浅部位富集。Au、Ag、Cu、Pb、Zn、Bi、Hg、Cd、Se、Mo、W、S、F等元素在垂向上也有较明显的迁移和成晕现象。同时发现原生晕在空间分布上具有复杂性, 研究认为成矿元素在成矿带轴向和垂向上的迁移扩散受多种因素影响, 包括成矿部位、成矿热液中元素浓度、热液的温度压力、围岩化学活性和可渗透性等。元素的扩散及原生晕的形成除与热液对围岩的蚀变作用、金属纳米粒子被地气携带上升有关外, 可能还与成矿作用过程中形成的金属气态络合物、气态水合粒子的迁移有关。元素垂向扩散形成的原生晕能够达到近地表部位, 这对于穿透性地球化学和原生晕找矿机理研究有重要意义。利用模型确定了新的深部找矿靶区和找矿方向。 |
| 中文关键词:山东 焦家金成矿带 曲家金矿 原生晕 立体地球化学模型 |
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| A Study of Geochemical Modeling of Primary Halos in the Qujia Gold Deposit, Laizhou, Shandong Province, and Its Revelation for Migration of Elements and Deep Prospecting |
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| Abstract:Most of the deposits related to hydrothermal activities are accompanied by the formation of primary halos, and its essence is the migration and diffusion of elements. The study of the zoning of primary halos and its concentration is of great significance for ore prospecting. The three-dimensional geochemical modeling of primary halos is a new research method formulated in recent years. The Qujia gold deposit and the North Zhaoxian prospecting area are located in the middle of Jiaodong Jiaojia metallogenic belt, being the deep extension of the Xincheng gold deposit and the Matang gold deposit. The occurrence elevation of Qujia gold orebody is –607 ~ –1466 m, and the maximum exploration depth is 1600 m. The deposit elevation of Zhaoxian exploration area is –1330 ~ –2170 m, and the maximum exploration depth is 2268 m. Therefore, this area has unique conditions for carrying out three-dimensional geochemical modeling study of primary halos. In view of such a situation, the authors collected 1130 core samples from 33 boreholes in southern Tengjia ore block of the Qujia gold deposit and 6 boreholes in the adjacent Zhaoxian exploration area in the west, and analyzed the content of 34 elements, and established the primary stereo-geochemical model with Micromine software, with the modeling elevation being 0 ~ –1810 m. The stereogeochemical model shows that high value zones of elements such as Au, Ag, Cu, Pb, As, Sb, Bi, Hg, Mo, W, S, Co, Ni, V, Cr, Ba, Sr, Cl, Se, Fe2O3, K2O, CaO and MgO are mainly distributed along the Jiaojia fault zone, and that the migration and enrichment of these elements were caused by metallogenic hydrothermal activities along the fault fracture zone. In the fracture alteration zone, the high value zones of Ni, Co, Sb, Ba and F are located in the deeper position, while K2O tends to be enriched in the shallow part. Au, Ag, Cu, Pb, Zn, Bi, Hg, Cd, Se, Mo, W, S, F and other elements also exhibited migration and formed primary halos in vertical direction. At the same time, it is found that the primary halo is complex in spatial distribution, and the axial and vertical diffusion of metallogenic elements in the metallogenic belt was affected by a variety of factors, such as orebody location, element concentration, temperature and pressure of metallogenic hydrothermal fluid, chemical activity and permeability of surrounding rocks. The diffusion of elements and the formation of primary halos were not only related to the alteration of surrounding rocks by hydrothermal fluids and the rise of metal nanoparticles carried by earth gas, but also related to the migration of metal gaseous complexes and gaseous hydration particles formed during mineralization. The primary halo formed by vertical diffusion of these elements can reach the near surface, which is of great significance for the study of the mechanism of penetrating geochemical and primary halo prospecting. At the same time, the model can be used to determine the new deep prospecting target areas and prospecting directions. |
| keywords:Shandong Province Jiaojia gold metallogenic belt Qujia gold deposit halo stereochemical model |
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