福建银石坪铁矿床地质特征、矿床成因及找矿前景

Research on geological characteristics,genesis and prospecting potential of Yingshiping iron deposit,Fujian

银石坪矿床是近年来在福建龙岩马坑—大田汤泉铁矿整装勘查区内新发现的具有较大规模的铁矿床,研究程度较低。本文运用地质、地球物理和地球化学方法,系统总结了区内地层、构造、岩浆岩、磁异常、矿体和矿石特征,分析了地层、构造和岩浆岩与铁成矿关系,进而探讨矿床成因。研究表明,银石坪矿床主要矿体呈层状—似层状赋存于石炭系下统林地组,次要矿体往往呈脉状和透镜状;深部矿石为块状结构,地表矿石为蜂窝状、松散土状褐铁矿,并具有与矿化密切相关的硅化、褐铁矿化、磁铁矿化和绢云母化等围岩蚀变,矿床成因类型为沉积-改造型褐铁矿床。矿区磁异常地段、岩体与林地组接触带具有良好的找矿前景。该矿床的发现和评价将有助于闽西南大田铁铜多金属成矿区矿产资源勘查工作的接续和找矿工作的突破。

Yinshiping iron deposit is newly discovered in recent years at the integrated exploration area of Makeng-Datian Tangquan iron exploration area in Longyan City,Fujian Province,with a low research degree.In this paper,geological,geophysical and geochemical methods are used to systematically analyze the characteristics of strata,igneous rocks,magnetic anomalies,ore bodies and ores in the area,and it also discusses the relationship between strata,structures,igneous rocks and iron mineralization and the deposit genesis.The research result indicates that the main ore bodies of Yinshiping deposit are distributed in a layered to quasi layered shape within the Lower Carboniferous Lindi Formation,while the secondary ore bodies are often in the form of veins and lenses.The deep ore has a block structure,while the surface ore is honeycomb and loose soil limonite,with closely related rock alteration such as silicification,limonitization,magnetization,and sericitization.Yinshiping iron deposit is a sedimentary reformed limonite deposit.There is a good prospecting prospect at the magnetic anomaly area and contact zone between the rock mass and Lindi Formation in the mining area.The discovery and evaluation of this deposit shall contribute to the continuation of mineral resources exploration and ore prospecting breakthrough in the Datian iron-copper polymetallic metallogenic area in Southwest Fujian.