内蒙古兴和县曹四夭钼矿床地球化学特征及成矿模型探讨

Discuss on the Molybdenum Deposit Geochemical Characteristics and Metallogenic Model in Xinghe County,Inner Mongolia

内蒙古兴和县曹四夭钼矿是河南省地勘二院2010年新发现的一个特大型钼矿,就目前工作程度,预计钼金属量超过200万吨。通过对该钼矿床地球化学特征的分析研究,揭示了利用岩屑化探测量作为有效手段发现并推断斑岩型钼矿床规模的基本思路。该区通常主要钼矿体地表露头被严格限制在Mo、W、Cu、Pb、Zn、As、Sb综合异常中心部位,成矿母岩花岗斑岩是钼矿体主要控矿因素,也是重要的找矿标志,元素组合分类和水平分带特征为判断矿体前景指明了方向。(Mo+W+Zn)/(Cu+As+Sb)三元素加权比值图不仅揭示了钼矿体地表剥蚀水平,而且指示了钼矿体边缘与物化探等值线梯度带的对应特征,初步建立了曹四夭钼矿床的成矿地球化学模型。

The Caosiyao molybdenum deposit in Xinghe County, Inner Mongolia is a superhuge type deposit, which was newly found by the No.2 Geoexploration Party of Henan Bureau of Geoexploration and Mineral Development. The molybdenum resources can be estimated to more than 200 million tons based to the exploration work. Through the analysis on the geochemical characteraistics of the deposit, the authors think that the debris geochemical measurement is a effective method to find porphyry molybdenum ore. The main molybdenum body outcrops are strictly limited in the comprehensive abnormal center of the element Mo, W, Cu, Pb, Zn, As and Sb. The metallogenic parent rock, granite porphyry is not only the main orecontrol facter but also the crucial orehunting indicator. Element combination classification and horizontal zoning characteristics indicate the direcion of the orebody prospecting. The three elements weighted ratio figure （Mo＋W＋Zn）/（Cu＋As＋Sb） reveals the molybdenum ore body＇ s surficial denudation level and indicates the characteristic of correspondence between moltbdenum ore body margin and geophysical and geochemical equivalent line gradient belts. Consequently the metallogenic geochemical model of the Caosiyao molybdenum deposit was established.