北武夷地区逆冲推覆构造的特征及其控矿作用

Thrust nappe structure and its ore-controlling effects in the North Wuyi area, China

北武夷地区成矿地质条件优越,矿产资源分布广泛,而广泛发育的推覆构造深刻影响着矿床的成生与保存。区域性推覆构造是成矿前、成矿期还是成矿后的构造,其精细结构特征如何,是否具有控岩控矿作用,如果是破矿作用,是否造成矿体重复增大或者隐伏、缺失等问题,严重影响着地质找矿的效果。建议开展面积性、追索性的路线地质调查,查明逆冲推覆构造的区域分布、不同单元的产状和构造样式,分别采用40Ar-39Ar和Re-Os定年技术测定推覆构造和矿体的形成时代,结合定量化分析及精细构造解析,研究构造与矿床的成生联系,预测隐伏矿体可能的位置,进而为北武夷地区寻找隐伏矿床和扩大矿床远景提供参考。

The North Wuyi area is characterized by advantageous mineralizing geological conditions and widespread mineral resources, but the formation and conservation of ore deposits are mainly controlled by thrust nappe structure. Many problems seriously affect the results of geological survey and mineral exploration. These problems include： whether regional thrust nappe structure is formed before, during or after mineralization, how about its fine structure characteristics, whether it has rock- and ore-controlling effects, and whether destruction, if any, may cause orebodies to be enlarged or buried or absent. This paper proposes the following： canT out areal and tracing geological reconnaissance, ascertain the regional distribution of thrust nappe structure and attitudes and structural patterns of different units, use ^40Ar-^39Ar and R.e-Os dating techniques to determine the ages of formation of the thrust nappe structure and orebodies, use quantification analysis and fine structural analysis to study the genetic relations between the thrust and ore deposits and predict the possible location of hidden orebodies, and then further provide reference for looking for hidden ore deposits and enlarging ore prospects in the North Wuyi area.