铜陵—池州地区水系沉积物测量地球化学特征及找矿方向

在长江中下游铁、铜、金多金属成矿带1∶20万水系沉积物测量的基础上,对铜陵—池州地区的地球化学异常特征进行初步总结。通过对区内元素进行因子分析,得出多种与成矿有关的异常组合,利用成矿元素异常组合划分地球化学分区,进而圈定地球化学异常。通过对比成矿地质背景和地球化学条件,对铜陵地区典型矿床进行相似度分析,预测池州地区的找矿远景区。结果表明:综合区域上的地层、构造、岩浆岩和区域矿产等资料,对成矿元素异常组合进行地球化学分区是可行的,能有效反映致矿异常,突出矿化信息;根据样点相似度值的计算结果与典型矿床相似度图的耦合情况分析,池州市南部的梅街镇、青阳县东侧、铜山铜矿外围是区域上最为有利的铜多金属找矿远景区。

GEOCHEMICAL CHARACTERISTICS AND ORE-SEARCH TARGETING IN TONGLING-CHIZHOU AREA OF ANHUI PROVINCE BASED ON STREAM SEDIMENT SURVEY

Based on the 1 ∶ 200,000 stream sediment survey along the Yangtze River Fe, Cu, Au polymetallic ore-forming belt, the authors made a preliminary study of the geochemical anomaly characteristics in Tongling-Chizhou area. Factor analysis was employed for the elements, and the ore-forming elements assembly was determined. The ore-forming elements anomalies assembly was used to make geochemical division and, as a result, geochemical anomalies were delineated. Based on a comparative study of geological backgrounds and geochemical conditions, the authors conducted similarity analysis of the typical deposits in Tongling area and forecast Chizhou pros-pecting area. In consideration of the strata, structure, intrusive rocks and mineral resources in this area, the authors hold that it is fea-sible to use the ore-forming elements anomalies for geochemical division, which can effectively reflect anomalies caused by mineraliza-tion and highlight the mineralization information. Based on an analysis of the coupling between the similarity value calculations of the samples and the similarity graph of the typical deposit, the authors hold that Meijie Town in southern Chizhou City, the east side of Qingyang County, and the periphery of the Tongshan copper mine are most favorable areas in search for Cu polymetallic deposits.