| 山东莱州曲家金矿原生晕地球化学分带性研究及地质意义 |
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| 关键词:Shangdong Province Jiaojia gold metallogenic belt Qujia gold deposit halo geochemical zoning |
| 基金项目:国家重点研发项目(编号: 2016YFC0600600);国家自然科学基金项目(编号: 41672084; 41772076; 41372086; 41503038; 41140025) |
| 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 | | | 朱学礼 | 山东黄金地质矿产勘查有限公司 | | | 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 | | | 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 | | | 迟乃杰 | 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 Zonation of Primary Halos in the Qujia Gold Deposit, Laizhou, Shandong Province, and Its Geological Significance |
| The Qujia gold deposit lies in the middle of the Jiaodong Jiaojia metallogenic belt and is the deep extension of the Xincheng and Matang gold deposits. The orebodies occur at the depths from 300 m to 1300 m and the deposit has reached exploration stage. Systematic sampling for 32 borehole cores in this area was conducted and 34 elements of the samples were analyzed. A study of the data obtained has revealed that multiple elements migrated not only in the axial direction of the orebody but also in the vertical direction within this depth range, which formed primary geochemical halos that is of great significance for the study of penetrating geochemistry and the primary halo prospecting mechanism. At the same time, it has been found that the axial and vertical diffusion of metallogenic elements in the metallogenic belt is affected by a variety of factors, such as location of orebodies, concentrations of elements, temperature and pressure of metallogenic hydrothermal fluids, chemical activity and permeability of wall rocks, which are complex in spatial distribution. The high concentration zone of primary halos is distributed mainly along the fault-alteration zone. The superposition of head halos upon the tail halos of elements in the deep part from axial compositional zonation determined by Gregorian and barycenter methods suggests that hidden orebodies may exist at the deep level, which is consistent with the exploration results of the adjacent Zhaoxian exploration area in the west. A vertical difference of compositional zonation from shallow to deep level is present. The elements with strong vertical migration capability and easy concentration in the shallow level are Se, Cd, Mo, Hg, Bi, S, F, Cu and Ag. The elements with high concentrations near the mineralization belt are Sb, As, Au, W, etc. When multiple elements at the shallow level simultaneously reach the concentrations K2O≥4.57×10–2, Au≥0.8×10–9, Ag≥0.057×10–6, Cu≥2.5×10–6, Bi≥0.08×10–6, Hg≥17×10–9, S≥0.0583×10–2, Mo≥0.74×10–6, and W≥0.55×10–6, gold orebodies are likely to be found at deep level. The indexes of Hg·Ag/(As·W) and Bi·Hg/(As·Au) can be used to judge the buried depth of the gold orebody. |
| YANG De-ping,YU Xue-feng,WANG Lin-gang,XIONG Yu-xin,ZHU Xue-li,SHU Lei,SONG Ying-xin,LIU Peng-rui,CHI Nai-jie.2020.A Study of Geochemical Zonation of Primary Halos in the Qujia Gold Deposit, Laizhou, Shandong Province, and Its Geological Significance[J].Acta Geoscientica Sinica,41(3):337-356. |
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