| 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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| 关键词:Shandong Province Jiaojia gold metallogenic belt Qujia gold deposit halo stereochemical model |
| 基金项目:国家重点研发计划项目(编号: 2016YFC0600600) |
| 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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| 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 |
| 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. |
| YANG De-ping,YU Xue-feng,WANG Lin-gang,XIONG Yu-xin,LIU Peng-rui,SHU Lei,SONG Ying-xin,ZHU Xue-li,NIU Zhi-li.2020.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[J].Acta Geoscientica Sinica,41(6):899-918. |
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