| 青海省都兰县各玛龙银多金属矿床地球化学特征及深部找矿指示意义 |
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| 引用本文：于小亮,王成勇,马财,李杰,童海奎,靳浩,王涛,裴有生.2026.青海省都兰县各玛龙银多金属矿床地球化学特征及深部找矿指示意义[J].地球学报,47(3):527-540. |
| DOI：10.3975/cagsb.2025.070421 |
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| 基金项目:本文由青海省地质勘查基金项目“青海省柴周缘主要矿集区矿产资源深部勘查方法技术示范研究”(编号: 2021074008ky008)、“青海省重要矿集区深部找矿突破示范”(编号: 2023085029ky004)和青海省“昆仑英才”行动计划(青海省战略性矿产绿色高效勘查技术科技创新团队)联合资助。 |
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| 中文摘要:各玛龙银矿床位于东昆仑造山带东段, 是近年来新发现的一个中型银矿床, 为进一步扩大矿床规模, 扩展深部找矿空间, 本文针对16勘探线的Ⅲ矿带开展了地球化学研究, 分析了Au、Ag、Cu、Pb、Zn、W、Sn、Mo、As、Sb、Hg、F、Mn、Bi、Co等15种元素。用相关性分析、因子分析和聚类分析等数理统计学方法研究了元素组合特征, 均明显地表现为多期热液叠加成矿的特征; 运用格里戈良原生晕分带指数法计算了原生晕分带指数。研究表明, 该矿床近矿晕元素为Ag、Au、Pb、Zn(Cu), 前缘晕元素为Hg、As、Sb(F), 尾晕元素为W、Mo、Bi、Sn(Mn)(Co); 矿体自上而下其原生晕轴向分带序列为F→Hg→W→Co→Cu→Pb→Au→Bi→Ag→As→Mn→Sb→Zn→Sn→Mo, 主成矿元素Ag、Au、Pb、Zn异常均与矿体基本套合, 前缘晕、近矿晕和尾晕元素叠加共存, 且成矿元素异常向深部延伸, 未显示尖灭现象。原生晕地球化学参数变化曲线呈现出“升—降—升”的特征, 特别是在3 800 m中段到3 700 m中段各参数均表现为“升”的趋势, 显示矿体在3 700 m中段往下还有很大的延伸性, 预测矿体有向深部延伸的可能性, 进而说明矿床深部有较大的增储潜力。 |
| 中文关键词:各玛龙 原生晕 元素组合特征 轴向分带序列 深部预测 |
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| Geochemical Characteristics and Implications for Deep Prospecting in the Gemalong Silver Deposit in Dulan County, Qinghai Province |
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| Abstract:The Gemalong silver deposit is situated in the eastern segment of the East Kunlun orogenic belt and is a recently discovered medium-sized deposit. To further expand the scale of the deposit and explore the deep prospecting space, this study conducted geochemical analyses on the Ⅲ ore belt along the 16th exploration line, analyzing 15 elements including Au, Ag, Cu, Pb, Zn, As, Sb, Hg, F, Mn, W, Sn, Mo, Bi, and Co. Using correlation, factor, cluster analyses, the study identified elemental associations indicative of multi-stage hydrothermal superimposed mineralization. The Grigoryan method was applied to determine the primary halo zoning index. Results show that the near-ore halo elements are Ag, Au, Cu, Pb, and Zn, front halo elements are Hg, As, and Sb(F), and tail halo elements are W, Mo, Bi, Sn(Mn)(Co). The axial zoning sequence from top to bottom is F→Hg→W→Co→Cu→Pb→Au→Bi→Ag→As→Mn→Sb→Zn→Sn→Mo. Anomalies of the main ore-forming elements Ag, Au, Pb, and Zn are generally consistent with the ore body. The coexistence and overlapping of front halo, near-ore halo, and tail-halo elements continuous mineralization extending into deeper zones without abrupt termination. geochemical parameters variation curves of the primary halo exhibit a “rise–fall–rise” pattern, with all parameters increasing between the 3 800 m and 3 700 m level, indicating significant extension potential below the 3 700 m level. It is inferred that the ore body may extend downward into deeper zones, suggesting considerable potential for resource expansion at depth. |
| keywords:Gemalong primary halo element combination characteristics axial zonation sequence prediction for mineral exploration in depth |
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