张丹
摘要:为研究辽宁省灯塔市柳河子镇一带铁矿成矿的地质特征,对灯塔市柳河子镇一带铁矿所处的区域地质背景,矿区、矿体地质特征等进行论述,分析总结矿体的成矿条件,探究岩浆活动、构造运动及围岩蚀变与铁矿体成因之间的关系。结果表明,区内出露的太古代鞍山群茨沟组为铁矿体的主要赋矿层位,铁矿层主要呈条带状赋存于黑云角闪斜长片麻岩及斜长角闪岩中;断裂构造多具控矿作用,为成矿提供元素的运移通道;矿体规模较小,矿石品位较低,变化较稳定。矿床成因主要为区域变质铁矿床,为“鞍山式”铁矿床。
关键词:铁矿;地质背景;地质特征;控矿作用;矿床成因
Analysis of Metallogenic Geological Characteristics of Iron Ore in Liuhezi Town, Dengta City, Liaoning Province
ZHANG Dan
(Geophysical Measuring Exploration Institute of Liaoning Province, Shenyang, Liaoning Province, 110034 China)
Abstract: In order to study the geological characteristics of iron ore mineralization in Liuhezi Town, Dengta City, Liaoning Province, this paper discusses the regional geological background, mining area and ore body geological characteristics of the iron ore in Liuhezi Town, Dengta City, analyzes and summarizes the ore forming conditions of the ore body, and explores the relationship between magmatic activity, tectonic movement, wall rock alteration and the genesis of the iron ore body. The results show that: the Cigou formation of Archean Anshan Group is the main ore bearing horizon of iron ore body, and the iron ore bed mainly occurs in biotite hornblende plagioclase gneiss and plagioclase amphibolite in strip shape; the fault structure has ore controlling function, which provides the migration channel of elements for mineralization; the ore body is small in scale, low in grade and stable in change. The genesis of the deposit is mainly regional metamorphic iron deposit, which is Anshan type iron deposit.
Key Words: Iron ore; Geological characteristics; Metallogenic conditions; Ore control; Genesis of the deposit
遼宁省灯塔市柳河子镇一带铁矿成矿地质条件十分优越,区内地层主要是太古代鞍山群茨沟组,构造较为发育。本文论述和研究了辽宁省灯塔市柳河子镇一带铁矿的成矿地质条件,分析柳河子镇一带铁矿的成因,对灯塔市柳河子镇一带铁矿的成矿规律进行总结和论述。
1 区域地质背景
区域地层除第四系外,主要为太古界鞍山群茨沟组(Ar2cg)、及大峪沟组(Ar2dy)。 茨沟组:主要岩性,条带状磁铁石英岩,细粒斜长角闪岩,斜长角闪岩,黑云角闪斜长片麻岩,混合质黑云变粒岩。为本地区主要的含铁层位。大峪沟组:主要岩性黑云斜长片麻岩、黑云角闪片麻岩、斜长角闪岩、磁铁石英岩。第四系全新统(Q4):分布于河床及沟谷中,岩性为砂砾石、粘质砂土。区域内有两条构造带,一条西南-北东走向,长约5km,为平移断层,另一条南-北北东走向,长约4km,为正断层,断层面倾向北西,倾角50°-60°。……