| 甘肃寨上金矿南矿带构造叠加晕实用模型及深部找矿预测 |
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| 引用本文： | 王斌,宋伊圩,孙彪,杨可,马振宇,康成鑫,张旺,蒋东祥,唐源壑,杨洋,姬省军,牛秋生.甘肃寨上金矿南矿带构造叠加晕实用模型及深部找矿预测[J].现代地质,2021,35(6):1504-1514. |
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| 作者姓名： | 王斌 宋伊圩 孙彪 杨可 马振宇 康成鑫 张旺 蒋东祥 唐源壑 杨洋 姬省军 牛秋生 |
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| 作者单位： | 中国地质调查局 西安矿产资源调查中心,陕西 西安 710199 |
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| 基金项目： | 中国地质调查局项目“甘肃寨上金矿岩金普查”(DD20191018);“秦岭地区金银矿资源勘查”(DD20208008) |
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| 摘 要： | 为了研究甘肃寨上金矿南矿带矿体隐伏规律,预测深部找矿远景,基于构造叠加晕找矿方法对该矿床南矿带深部找矿潜力进行探讨。对南矿带32号脉9种金属元素(Au、Ag、As、Bi、Cu、Pb、Sb、W、Zn)的测试数据进行数学地质分析,结果表明Au与As具有较好的相关性,是找矿的指示元素;As与Sb、Cu与Bi的相关系数分别为0.586、0.945,可能与它们在热液上升过程中靠近矿体的头部和尾部有关。基于对矿区9种元素的数学统计分析并与中国金矿床原生晕综合轴向(垂向)分带序列对比,得到寨上矿区理想原生晕分带序列为:As-Sb(前缘晕)→Pb-Ag-Au-Zn-W(近矿晕)→Cu-Bi(尾晕);根据改良的格里戈良分带指数法得到各勘探线轴向分带序列,前、尾晕共存等“反分带”现象的出现表明存在多次热液叠加作用。使用克里金插值法得到衬值晕分带图,显示矿体向东倾覆,含矿热液应从东南向西北运移,剥蚀程度自东向西加强。在野外地质工作的基础上,结合矿区地质特征和元素空间分布规律,建立了南矿带构造叠加晕实用模型。根据原生晕找矿特征标志,32号脉东南部67线深处的有利成矿空间指示有矿,并将其定成预测靶位。通过布设钻孔ZK67-0验证了预测靶位的准确性,表明构造叠加晕实用模型在寨上金矿找矿预测具有可行性。
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| 关 键 词： | 构造叠加晕 实用模型 深部预测 甘肃寨上金矿 |
| 收稿时间： | 2021-04-20 |
| 修稿时间： | 2021-09-28 |
Structural Superimposing Halo Practical Modeling and Deep Prospecting Prediction of Zhaishang Gold Deposit in the Gansu Province |
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| WANG Bin,SONG Yiwei,SUN Biao,YANG Ke,MA Zhenyu,KANG Chengxin,ZHANG Wang,JIANG Dongxiang,TANG Yuanhe,YANG Yang,JI Shengjun,NIU Qiusheng.Structural Superimposing Halo Practical Modeling and Deep Prospecting Prediction of Zhaishang Gold Deposit in the Gansu Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(6):1504-1514. |
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| Authors: | WANG Bin SONG Yiwei SUN Biao YANG Ke MA Zhenyu KANG Chengxin ZHANG Wang JIANG Dongxiang TANG Yuanhe YANG Yang JI Shengjun NIU Qiusheng |
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| Institution: | Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an,Shaanxi 710199, China |
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| Abstract: | To investigate the concealed law of Zhaishang gold ore-bodies and deep prospecting, we discuss the exploration potential based on the structural superimposing halo practical model. The results from nine metal elements (Au,Ag,As,Bi,Cu,Pb,Sb,W,Zn) in No.32 Vein of the Southern Ore Belt show good Au vs. As correlation, which are the indicator elements for prospecting. The correlation coefficients of As, Sb, and Cu, Bi are 0.586 and 0.945, respectively, which may indicate that they are related to the head and tail of the ore-body during the hydrothermal fluid ascent. Based on the mathematical statistical analysis of the nine elements at the mine and comparing the integrated vertical zoning sequence of the primary halo in Chinese gold deposits, the ideal primary halo zoning sequence at Zhaishang is As-Sb (front halo) → Pb-Ag-Au-Zn-W (near mine halo) → Cu-Bi (tail halo). According to the modified Grigorian zoning index method, the axial zoning sequence of each exploration line is obtained. The occurrence of “anti-zoning” phenomena, such as the coexistence of front and tail halos indicates multiple superimpositions. The Kriging interpolation method was used to obtain the lining halo zoning map, which shows that the ore-body is overturned to the east. The ore-forming fluid may have migrated from southeast to northwest, and the denudation degree increases from east to west. Based on the fieldwork, geological characteristics and spatial distribution of elements at the mine, we have established a practical model of structural superimposing halo in this ore belt. According to the primary halo prospecting cha-racteristics, ore-bodies are likely present at the depth of Exploration Line 67 in the southeastern part of No.32 Vein, which is proven by the ZK67-0 drill hole. This further shows the feasibility of the structural superimposing halo practical modeling for prospecting of the Zhaishang gold deposit. |
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| Keywords: | structural superimposing halo practical model deep prospecting prediction Zhaishang gold deposit Gansu |
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