甘蒙北山四道梁南钼矿土壤地球化学异常 特征及找矿潜力分析

甘蒙北山四道梁南地处东天山-北山中亚增生造山带南缘，早二叠世-三叠纪早期完成了俯冲增生体制到伸展构造体制动力转换过程，伸展背景下多期次的酸性岩浆活动为斑岩型和浅成低温热液型铜、金、银、钼矿床的形成提供了良好的地质条件。本文通过对区内土壤地球化学测量数据的多元统计分析，探讨了成矿元素及伴生元素异常组合、分布特征，结合成矿地质背景评价了找矿潜力。研究发现区内Bi、Mo、As等元素高强度数据占比大、分异程度高，是主要的成矿元素，异常主要分布在印支期中细粒二长花岗岩与早二叠世双堡塘组英安岩的接触带附近；成矿元素组合与矿化蚀变分带具有从高温W、Mo、Bi→中高温Pb、Zn、Ag→中低温Hg、Sb、Cu→低温As、Au演化的规律；结合矿床地质特征，认为其具有与斑岩型成矿系统相似的成矿元素组合和矿物分带特征，属于斑岩型钼矿床且具有较好的找矿前景。同时确定W-Mo-Bi元素组合异常是区内寻找Mo（W）矿床的有利指示元素或找矿标志，可有效地确定成矿部位并指导勘查工程布置

Soil geochemical anomaly characteristics and prospecting potential of the Sidaoliangnan molybdenum deposit in the Beishan area, Gansu and Inner Mongolia

The Sidaoliangnan in the Beishan area of Gansu Province and Inner Mongolia is located at the southern edge of the East Tianshan to Beishan Mountain Central Asian accretionary orogenic belt, and has undergone the process of dynamic transformation from subduction accretionary system to extensional tectonics system in the Early Permian - Triassic. The multi-stage acid magmatic activity in the extensional background provided good geological conditions for the formation of porphyry and epithermal copper, gold, silver and molybdenum deposits. Based on the multivariate statistical analysis of soil geochemical survey data in the area, this work discussed the anomaly combination and distribution characteristics of metallogenic elements and associated elements, and evaluates the prospecting potential in combination with the metallogenic geological background. Results show that Bi, Mo, As and other elements in the area account for a large proportion of high intensity data and have a high degree of differentiation, which are the main ore-forming elements. The anomalies are mainly distributed near the contact zone between the Indosinian medium to fine-grained adamellite and the Early Permian Shuangbaotang Formation dacite. The combination of ore-forming elements and the zoning of mineralization and alteration follow a pattern of evolution from high temperature W, Mo, Bi to medium-high temperature Pb, Zn, Ag to medium-low temperature Hg, Sb, Cu to low temperature As, Au. Based on the geological characteristics of the deposit, it is believed that it has similar ore-forming element combinations and mineral zoning characteristics to a porphyry type ore-forming system, and belongs to the porphyry type molybdenum deposit with good prospecting prospects. The W-Mo Bi element combination anomaly is inferred to be a favorable indicator element or prospecting indicator for searching for Mo (W) deposits in the area, which can effectively determine the mineralization location and guide the layout of exploration engineering.