| 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 |
| |
| 引用本文： | 杨德平,于学峰,王林钢,熊玉新,朱学礼,舒磊,宋英昕,刘鹏瑞,迟乃杰.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[J].地球学报,2020,41(3):337-356. |
| |
| 作者姓名： | 杨德平 于学峰 王林钢 熊玉新 朱学礼 舒磊 宋英昕 刘鹏瑞 迟乃杰 |
| |
| 作者单位： | 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;山东黄金地质矿产勘查有限公司 |
| |
| 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) |
| |
| 摘 要： | 曲家金矿位于胶东焦家成矿带中段,为新城金矿和马塘金矿的深部延深,矿体赋存深度300~1300 m。对区内32个钻孔岩心样品进行了取样,获得了34个元素的分析数据,研究了各元素的浓度分带及成分分带。发现多元素在此深度范围内除沿矿体轴向有迁移成晕外,在垂向上也有迁移和成晕现象,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。同时发现成矿元素在成矿带轴向和垂向上的扩散受多种因素影响,包括矿体部位,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,在空间分布上具有复杂性。原生晕的高浓度带主要沿断裂蚀变带分布。用格里戈良法和重心法确定的轴向成分分带,在深部有头晕元素与尾晕元素的叠加,预示深部仍存在隐伏金矿体,这与西部邻近招贤勘查区深部发现金矿体的勘查结果相符。垂向上从浅到深成分分带性存在差异,垂向上易在浅部浓集的元素为Se、Cd、Mo、Hg、Bi、S、F、Cu、Ag,成矿带附近浓集的元素为Sb、As、Au、W等,As、Sb在垂向上的迁移能力弱,主要沿轴向迁移。当浅部多个元素同时达到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,W≥0.55×10–6时,指示深部发现金矿体的可能性较大,Hg·Ag/(As·W)、Bi·Hg/(As·Au)指数可用来判断金矿体的埋深。
|
| 关 键 词： | 山东 焦家金成矿带 曲家金矿 原生晕 地球化学分带 |
A Study of Geochemical Zonation of Primary Halos in the Qujia Gold Deposit, Laizhou, Shandong Province, and Its Geological Significance |
| |
| 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.A Study of Geochemical Zonation of Primary Halos in the Qujia Gold Deposit, Laizhou, Shandong Province, and Its Geological Significance[J].Acta Geoscientia Sinica,2020,41(3):337-356. |
| |
| Authors: | 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 |
| |
| Institution: | Shandong Institute of Geological Sciences, Key Laboratory of Gold Mineralization Processes and Resource Utilization of Ministry of Natural Resources, Key Laboratory of Metallogenic Geological Processes and Resource Utilization in Shandong Province;Shandong Gold Geology and Mineral Exploration Co. Ltd. |
| |
| Abstract: | 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. |
| |
| Keywords: | Shangdong Province Jiaojia gold metallogenic belt Qujia gold deposit halo geochemical zoning |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地球学报》浏览原始摘要信息 |
| 点击此处可从《地球学报》下载免费的PDF全文 |
|
