内蒙古准苏吉花铜钼矿区土壤热磁组分地球化学异常特征及意义

Characteristics and significances of soil thermomagnetic components geochemical anomalies of the Zhunsujihua copper-molybdenum deposit in Inner Mongolia

准苏吉花斑岩型铜钼矿床是内蒙古中北部新近发现的铜钼多金属矿床之一。这里对矿区地表土壤热磁组分中元素含量及异常特征进行了研究,结果表明元素异常在平面上出现明显的分带性,以地表矿化露头为中心向外依次为Mo-Cu-W-Te带、Ag-Bi-In-Zn-Cd带及As-Pb-Mn-Sb带,所有元素异常均包含在Fe2O3异常之内。通过土壤热磁组分地球化学测量,共圈出七个多元素组合异常,经野外异常查证,认为土壤热磁组分地球化学异常为有效的地质异常。因此,在风成沙覆盖区应用土壤热磁组分地球化学测量方法,配合多重分形(含量-求和法)和地质累积指数(Igeo)等统计方法,可最大限度消除风成沙干扰,快速、有效地确定异常下限,圈定多元素组合异常,提供有利找矿靶区。

The Zhunsujihua porphyry copper-molybdenum deposit is one of the newly found copper molybdenum poly-metallic deposits in the middle-north of Inner Mongolia.The elements content and anomaly characteristics of soil thermomag-netic components in the ore district is studied in this paper.The results indicated that the elements anomalies show an obvious zoning in the plane with a Mo-Cu-W-Te zone,Ag-Bi-In-Cd zone and As-Pb-Mn-Sb zone from mineralize outcrop center to outside,and they are all included in the Fe2 O3 anomaly.Seven multi-elements assemblage anomalies are determined by soil therommagnetic components geochemical survey.According to field investigation,the geochemical anomaly in soil ther-momagnetic components is an effective geological anomaly.Thus,the soil thermomagnetic components geochemical survey method is used to combine with multi-fractal(content summation)and index of geoaccumulation in eolian sand coverage area, which can eliminate the interference from eolian sand maximally,can determine the anomaly limit and multi-elements assem-blage anomaly quickly and effectively,and provide favorable prospecting target area.