The Concept and Application of Element Equivalent-concentrating: A Case Study for Anomaly Interpretation of Soil Survey from Zhongba Mining Area, Ningqiang County, Shaanxi Province
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摘要: 矿产资源是一类有用元素高度富集的特殊地质体。为便于对比研究各元素在成矿作用过程中富集离散规律，笔者提出了等量浓集概念。将各元素从克拉克值到矿体边界品位的浓集过程进行等量划分，使得不同元素间富集程度具有定量可比性，即在同一等量浓集级次上各元素具有同等富集程度和成矿潜力。将该方法应用于扬子北缘后龙门山造山带内的中坝矿区，取得了良好成效。从中坝矿区等量浓集直方图可知，主成矿元素为Au、Ag、Mo，成矿伴生元素为Cu、Zn，找矿指示元素为As、Sb、Pb；等量浓集地球化学图可以清晰突显出该区元素分区边界，指导厘定了志留系与寒武系界线，同时发现Au元素比其他元素有更高的浓集程度；通过等量浓集7级异常划分，圈定了较好的Au、Cu、Mo等元素异常，在7级Au异常区查证发现了辛家咀金矿。实践表明，应用等量浓集原理研究元素分布、分配及富集离散规律简便而实用。Abstract: Mineral resources are a kind of special geological body highly enriched in useful elements. In order to facilitate the comparative study of the enrichment and dispersion laws of various elements in the process of mineralization, the author proposed the concept of equivalent-concentrating, which equally divided the concentration process of each element from the Clark value to the boundary grade of the ore body, so that the enrichment degree of different elements is quantitatively comparable, that is, each element has the same enrichment degree and metallogenic potential at the same equivalent-concentrating level. This method was applied to the Zhongba mining area in the Back-Longmenshan orogenic belt on the northern margin of Yangtze plate, and achieved good results. Through the element equivalent-concentrating histogram, it can be known that the main ore-forming elements in the Zhongba mining area are Au, Ag, Mo, the ore-forming associated elements are Cu, Zn, and the indicator elements are As, Sb, Pb; the geochemical maps in equivalent-concentrating method can clearly highlight the elemental boundaries of the area, guide the determination of the Silurian and Cambrian stratigraphic boundaries in the area, and it is found that Au has a higher degree of concentration than other elements; The anomalies are delineated such as Au, Cu, Mo, etc. and the Xinjiazui gold mine was found in the grade 7 gold anomaly area. Practice shows that it is simple and practical to apply the principle of element equivalent-concentrating to study the elements distribution and the law of enrichment dispersion.
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Keywords:
- equivalent-concentrating /
- Zhongba /
- soil survey /
- gold deposit /
- Ningqiang
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