| 甘肃加甘滩金矿覆盖层土壤微细粒地球化学指示 |
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| 引用本文：杨冬媛,杨超,李康宁,张旺,范超楠,谢富伟,袁臻,蔡龙,白云.2026.甘肃加甘滩金矿覆盖层土壤微细粒地球化学指示[J].地球学报,47(5):1043-1060. |
| DOI：10.3975/cagsb.2026.061101 |
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| 基金项目:本文由深地国家科技重大专项(编号: 2025ZD1009600)、甘肃省地质矿产勘查开发局院士专家工作站项目(编号: GSDKAEW2024)、成都理工大学珠峰科学研究计划项目(编号: 2024ZF11426)、甘肃省金矿资源勘查利用技术创新中心开放课题(编号: JKZY-202507)和新一轮找矿突破战略行动科技支撑项目(编号: ZKKJ202410)联合资助。 |
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| 中文摘要:近年来, 国内外研究者使用深穿透地球化学方法在隐伏矿床的勘查中取得显著成效, 但由于地表金属异常的多解性, 该方法在未知区域找矿中尚未得到广泛应用。因此, 亟需深入开展有效的地表异常示踪技术研发, 以增强覆盖区隐伏矿体的勘查能力。甘肃甘南地区加甘滩金矿作为区内重要的金矿床, 北西部发育厚大富矿体, 而南东部为后期沉积物覆盖, 为开展隐伏金矿的勘查方法研究提供了良好的研究对象。本研究采集了地表覆盖层土壤微细粒样品, 对Au、As、Sb、Hg四种元素的全量与活动态含量进行空间分布、相关性及影响因素研究。研究认为, Au含量在水平分带上呈现由矿化中心向外围系统性递减的趋势; Au、As、Sb三者的全量及活动态含量的相关性或对矿化区域具有协同指示作用; 构造与地形共同影响元素次生富集, 断裂带可为元素垂向迁移提供优势通道, 地表低洼区则可对Au、As、Sb等产生次生富集, 形成局部异常。此外, 基于ZK7202钻孔不同覆盖深度样品数据, 建立了Au和As两种元素含量与盖层厚度的指数模型(R2均＞0.75), 具有指示金矿体埋藏深度的潜力。因此, 盖层土壤微细粒分离与活动态测量的Au-As-Sb共生元素组合异常, 是隐伏金矿体的地球化学勘查与异常的重要指示标志。 |
| 中文关键词:加甘滩金矿 覆盖层 隐伏金矿找矿 土壤微粒 地球化学 |
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| Geochemical Indicators of Fine-grained Soil Fractions in the Overburden of the Jiagantan Gold Deposit, Gansu Province |
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| Abstract:Deep-penetrating geochemical methods have recently facilitated remarkable results in the exploration of concealed deposits. However, because the explanations for surface metal anomalies are often unclear, this method has not been widely applied in mineral exploration. Effective surface anomaly tracing technologies to enhance the exploration capabilities of concealed ore bodies in covered areas are required. The Jiagantan gold deposit in Gannan, Gansu Province has thick and rich ore bodies in the northwestern part, while the southeastern part is covered by younger sediments. This study collected soil fine-grained samples from the surface cover layer to investigate the spatial distribution, correlation, and influencing factors of the total and mobile forms of Au, As, Sb, and Hg. The Au content showed a systematic decrease from the mineralization center to the periphery, with significant horizontal zonation characteristics. Correlations among the total contents and mobile fractions of Au, As, and Sb synergistically delineate mineralized areas. Structures and topography jointly influence the secondary enrichment of elements: fault zones can provide favorable channels for the vertical migration of elements, while surface depressions can cause secondary enrichment of Au, As and Sb, forming local anomalies. Furthermore, based on sample data from varying depths of the ZK7202 borehole, separate exponential models were established for Au and As contents as a function of overburden thickness (R2> 0.75), which have the potential to indicate the burial depth of gold ore bodies. Therefore, the anomaly of the Au-As-Sb coexisting elemental association in the fine-grained fraction of the cover layer soil and the measurement of mobile fraction content is an important tool for geochemical exploration and an anomaly indicator for concealed gold ore bodies. |
| keywords:Jiagantan gold deposit cover layer concealed gold deposit exploration soil fine particles geochemistry |
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