赣西北石门寺超大型钨矿床多期成矿作用——累积概率格纸在钨矿成因及找矿中的应用

Multi-mineralization Stages of the Shimengsi Giant Tungsten Deposit of Northwest Jiangxi——The Application of Cumulative Frequency Distribution in Tungsten Ore Genesis and Ore Prospecting

针对石门寺钨矿床的钨成矿作用是否同样存在多时代(期次)特征,即非钨矿物(辉钼矿和白云母)的同位素年代学研究显示的多期次特征,应用概率格纸图解法对石门寺矿床的234个钻孔的62961件钻孔岩芯样(1/2劈芯)的WO3含量进行了定量分析。初步厘定出石门寺钨矿床存在至少两期含钨热液成矿作用,一期热液形成低WO3矿化富集度((0.027±0.008)^(0.059±0.023)%),但规模大(≥82%),为主成矿热液;另一期为高WO3矿化度((0.158±0.013)^(0.675±0.143)%),但规模相对小(≤18%),为次成矿热液。基本可以与同位素年代学的研究成果相对应,进一步认为石门寺钨矿床钨成矿的两期叠加作用,是钨成矿元素的巨量堆积的重要因素之一。应用概率格纸作图法是一种厘定成矿作用期次的有效方法,对找矿勘探同样有所帮助。

Whether the Shimengsi super-large tungsten deposit is characterized by multi-stages of tungsten mineralization as evidence from the isotope chronology of the molybednite and mouscovite.To answer this question,this Study conducts quantitative analysis of the WO3 contents by cumulative frequency distribution for the totality of 234 drill,and 62961 split core samples.Ore-forming fluids from two tungsten mineralization stages have been identified.One is a fluid result in extensive(≥82%)but low grade(0.027±0.008)^(0.059±0.023)%tungsten mineralization,another one is a fluid result in small-scale(≤18%)but high grade(0.158±0.013)^(0.675±0.143)%tungsten mineralization.These characteristics are corresponding to the two isotope chronology mineralization periods.Two period of mineralization accumulation is one of the most important factors for the formation of the Shimengsi tungsten deposit.The cumulative frequency distribution can be used as an effective method to identify the ore-forming fluid of different stages,and to explore the hydrothermal deposits.