冀东迁安地区BIF型铁矿地质特征及成因探讨  

Geological Characteristics and Genesis of BIF Iron Deposits in the Qian'an Area, Eastern Hebei Province

作　　者：许曼 吕水 韦文国 邢运涛[1] 刘海龙[1] 杨爱雪 李彪 安梦莹 XU Man;LÜShui;WEI Wenguo;XING Yuntao;LIU Hailong;YANG Aixue;LI Biao;AN Mengying(The Fifth Geoiogical Brigade of Hebei Bureau of Geology and Mineral Resources(Heibei Marine Geological Environment Survey Centre),Tangshan,Hebei 063000)

机构地区：[1]河北省地质矿产勘查开发局第五地质大队(河北省海洋地质环境调查中心),河北唐山063000

出　　处：《地质与勘探》2024年第5期900-918,共19页Geology and Exploration

基　　金：河北省地质矿产勘查开发局科研基金项目(编号:13000022P00329410109F);河北省地质勘查基金管理中心基金项目(编号:454-0502-YBN-63VD);河北省地质勘查基金管理中心基金项目(编号:13000022P00F2D4101750)联合资助。

摘　　要：冀东迁安地区是我国重要的BIF型铁矿集区之一。随着铁矿床开发利用程度的提高,浅部铁矿资源开发殆尽。近年来,多家地勘单位在迁安地区大中型铁矿床深部及外围进行找矿工作,在深部新发现了厚大矿体,取得了找矿突破。虽然勘查取得一定的成果,但相关的铁矿床分布规律及成矿模式未进行过系统的研究,对迁安地区成矿带缺少整体认识。本文系统分析了迁安地区沉积变质型铁矿的成矿地质条件,总结了赋矿地层特征。进行了迁安地区铁矿褶皱构造五级划分,确定三级倒转向斜构造为主要控矿构造。初步厘定了断裂构造为成矿期后的脆性断裂,多对矿体产生破坏和错断;明确了迁安地区铁矿分布在迁安隆起向南西突出的“C”字形边缘弧形褶皱带中,形态受倒转向斜控制。针对迁安部分矿区发现的第二层铁矿体,进行了深、浅部矿体地质特征对比分析,认为海底热液喷气活动具有周期性,原始沉积时形成了多层铁矿层,并经受成矿期后断裂构造改造,形成北高南低的阶梯状地堑赋矿模式。依据多年的勘探成果结合本次研究工作,建立了迁安地区成矿模式,为下一步找矿工作提供了理论支撑。The Qian'an area in eastern Hebei is one of the important BIF iron ore concentration areas in China.With the increasing development and utilization of iron ore deposits,shallow iron ore resources have been completely depleted.In recent years,multiple geological exploration units have been conducting prospecting work in the deep and peripheral areas of large and medium-sized iron deposits in the Qian'an area,and have newly discovered thick and large ore bodies in the deep areas and achieved prospecting breakthroughs.Although some achievements have been made in exploration,there has been no systematic study on the distribution patterns and mineralization models of related iron deposits,and there is a lack of overall understanding of the mineralization belt in the Qian'an area.This work systematically analyzed the ore-forming geological conditions of sedimentary metamorphic iron deposits in the Qian'an area and summarizes the characteristics of the ore-bearing strata.The five level division of iron ore fold structures in the Qian'an area was carried out,and the three-level reversed syncline structure was determined as the main ore controlling structure.It has been preliminarily determined that the fault structure is a brittle fault after the mineralization period,which often causes damage and dislocation to the ore body.It has been clarified that the iron ore distribution in the Qian'an area is located in the"C"-shaped arc-shaped fold belt protruding southwestward from the Qian'an uplift,and its morphology is controlled by the reversed syncline.A comparative analysis was conducted on the geological characteristics of the second layer of iron ore bodies discovered in some mining areas in Qian'an.It is believed that the submarine hydrothermal blow activity has periodicity,and multiple layers of iron ore layers were formed during the original sedimentation.After the mineralization period,the fault structure was transformed,forming a stepped graben ore-bearing model with high in the north and low in the south.Based on y

关 键 词：BIF铁矿 矿床分布规律 构造作用 成矿模式 迁安地区 冀东 

分 类 号：P611.3[天文地球—矿床学] P612[天文地球—地质学]