矿物学填图在福建丁家山铅锌矿成因研究中的应用

The application of mineralogical mapping on the study of formation of Dingjiashan Pb-Zn deposit,Fujian Province

应用典型矿物富集型异常填图,揭示了福建丁家山铅锌矿区各种矿物的带状切层分布特征,指出矿区接触交代变质热源(燕山期花岗岩)自矿区北西方向侵入,在矿区范围内的侵入中心位于北西向和北东向断层交汇处(Ⅲ-2矿体中部和Ⅲ-1矿体之间)。花岗岩在侵入过程中与中新元古代马面山岩群龙北溪组上段经区域变质的富钙质岩发生接触交代作用,在不同阶段形成石榴石、绿帘石、磁铁矿、磁黄铁矿、闪锌矿等典型矿物。矿区成矿流体自北东向南西运移。再次证实矿物场填图在变质类型研究方面的重要意义,希望引起高度重视。

As a classic study method of genetic mineralogy and prospecting mineralogy,mineralogical mapping is gradually ignored by researchers because of its large workload and time-consuming characteristics.Based on typical mineral enrichment abnormal mapping,the authors have revealed that minerals from the Dingjiashan Pn-Zn ore district have crosscut and banded distribution characteristics in the strata.It is pointed out that contact metamorphism heat（Yanshanian granite） of the Dingjiashan Pn-Zn ore district came from northwest,the intrusion center in the ore district was located at the intersection of northwest and northeast faults（between ore bodies Ⅲ-2 and Ⅲ-1）.Typical minerals,such as garnet,epidote,magnetite,pyrrhotite and sphalerite,were formed at different stages of contact metasomatism between Yanshanian granite and regional metamorphosed calcareous rock in Upper Longbeixi Formation of Proterozoic Mamianshan Group.Oreforming fluids flowed from northeast to southwest.This paper has reconfirmed the significance of mineral mapping in the study of metamorphism type in the hope that researchers will pay attention to this problem.