西藏哲古-雪莎一带锑金等多元素地球化学特征及靶区优选

Geochemical characteristics and target generation of antimony-gold and other elements in Zhegu-Xuesha area, Xizang

中文关键词:地球化学特征  锑金多金属  靶区优选  哲古-雪莎  西藏

keywords:geochemical characteristics  Sb-Au polymetallic deposits  target generation  Zhegu-Xuesha  Xizang

中文摘要:西藏特提斯喜马拉雅构造带成矿地质条件优越，是中国重要的锑金富集带。为服务藏南金锑等找矿突破，文章以该构造带东段哲古-雪莎地区为研究区，基于大比例尺地球化学勘查数据，开展元素地球化学参数及元素组合特征分析，采用分子区多背景方法确定异常下限，并以地球化学异常特征为核心开展区域找矿预测。结果显示，Au、As、Sb、Pb、Zn、Ag为区内主要成矿元素或伴生元素，上述元素构成3组独立且存在部分关联的成矿系统，即Au-As成矿系统、Sb-Ag成矿系统及Pb-Zn-Ag多金属成矿系统。分子区多背景异常法有效提高了预测精度，以元素地球化学异常特征为基础在区内圈定出4处找矿预测区，进一步细化圈定出A类靶区5处，B类靶区3处，C类靶区5处，并优选4处找矿靶区开展异常剖析。本次研究结果为区内锑、金等多金属元素找矿勘查和工作部署提供了一定的依据。

Abstract:The Tibetan Tethyan Himalayan Tectonic Belt boasts superior metallogenic geological conditions and stands as a significant Sb-Au enrichment belt in China. To facilitate prospecting breakthroughs for Au,Sb and other associated minerals in southern Xizang, this study focuses on the Zhegu-Xuesha area in the eastern segment of this tectonic belt. Based on large-scale geochemical exploration data, analyses of elemental geochemical parameters and element association characteristics were conducted. The subarea-multi background method was employed to determine the anomaly threshold, and regional prospecting prediction was performed with geochemical anomaly characteristics as the core basis. The results indicate that Au, As, Sb, Pb, Zn, and Ag are the primary ore-forming elements or associated elements in the study area. These elements constitute three independent and partially interrelated metallogenic systems, namely the Au-As metallogenic system, Sb-Ag metallogenic system, and Pb-Zn-Ag polymetallic metallogenic system. The subarea-multi background method effectively enhances the prediction accuracy. Based on the elemental geochemical anomaly characteristics, 4 high prospective areas were delineated in the region, which were further refined into 5 Class A target areas, 3 Class B target areas, and 5 Class C target areas. Additionally, 4 key prospecting targets were selected for in-depth anomaly analysis. The research findings provide a reliable scientific basis for regional mineral prospecting and exploration program planning searching for Sb, Au, and other polymetallic deposits in the study area.