| 王殿良,宫贯乾,刘小滨,杨建岭,刘佩欣.冀东湾杖子铁矿床地质特征、成矿规律及成因探讨[J].矿产勘查,2023,14(7):1074-1085 |
| 冀东湾杖子铁矿床地质特征、成矿规律及成因探讨 |
| Geological characteristics， metallogenic regularity and ore genesis of Wanzhangzi iron deposit， eastern Hebei Province |
| 投稿时间：2023-03-11 修订日期：2023-06-10 |
| DOI：10.20008/j.kckc.202307008 |
| 中文关键词: 地质特征 成矿规律 矿床成因 湾杖子铁矿 冀东 |
| 英文关键词: geological characteristics metallogenic regularity genesis of the deposit Wanzhangzi iron deposit Eastern Hebei Province |
| 基金项目:本文受秦皇岛华勘地质工程有限公司项目湾杖子铁矿补充详查（2012HXTKHK0528）资助。 |
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| 中文摘要: |
| 冀东地区是中国重要的沉积变质型铁矿资源地之一，随着开发程度的提高，当前面临着后备资源不足的问题，加强区内铁矿成矿规律研究，有助于寻找新的铁矿资源，进而缓解冀东地区铁矿后备资源紧张的局面。湾杖子铁矿床位于冀东地区的北东部，是一处中型铁矿床，矿体赋存于新太古界遵化岩群湾杖子岩组和三门店岩组变质岩中。本文在分析矿区以往勘查资料和笔者在本区勘查实践的基础上，总结了湾杖子铁矿床的成矿地质背景、矿床地质以及矿石特征，结合区域上前人研究成果，对该矿床的成矿规律和成因进行了初步研究。研究表明：湾杖子铁矿床为一典型的沉积变质型铁矿床，矿床由密集群带状分布的多条铁矿体组成，矿体形态以透镜状为主，沿走向和倾向具有明显的膨缩、尖灭再现现象。矿石主要由磁铁矿和石英组成，具有半自形—他形粒状变晶结构，条纹—条带状构造，矿石类型为需选弱磁性铁矿石。矿体的空间分布主要受地层控制，矿体总体有向南西倾伏的迹象，推测可能受控于枢纽向南西倾伏的向斜构造。成矿物质主要来自海底火山活动高温热液，沉积环境物理化学条件的改变导致硅质、铁质元素依次沉淀，形成原始条带状硅铁质建造，后经多次构造作用和变质改造形成条纹状、条带状铁矿石。研究成果可为认识湾杖子铁矿床成矿机制和指导该区铁矿找矿勘查提供参考。 |
| 英文摘要: |
| Eastern Hebei Province， which is one of the important sedimentary-metamorphic iron ore resources in China， holds significant reserves. With the improvement of development degree， it is facing the problem of insufficient reserve resources. Strengthening the study of iron ore metallogenic regularity in the area is helpful to find new iron ore resources， so as to alleviate the shortage of iron ore reserve resources of eastern Hebei Province. Wanzhangzi iron deposit is a medium-sized iron deposit located in the northeastern part of eastern Hebei Province. The ore body is hosted in the metamorphic rocks of Wanzhangzi Formation and Sanmendian Formation of the Neoarchean Zunhua rock group. Based on the analysis of the previous exploration data of the mining area and the author's exploration practice in this area， this paper summarizes the metallogenic geological background， deposit geology and ore characteristics of the Wanzhangzi iron deposit. Combined with the previous research results in the region， the metallogenic regularity and genesis of the deposit were preliminarily studied. The research shows that Wanzhangzi iron deposit is a typical sedimentary-metamorphic iron deposit， composing of several iron ore bodies distributed in dense groups. The ore body is mainly lenticular， with obvious expansion， contraction and pinch-out reproduction along the strike and tendency. The ore is mainly composed of magnetite and quartz， with semi-automorphic-allomorphic granular crystal structure， stripe-banded structure， Besides， the ore type is weakly magnetic iron ore. The spatial distribution of the ore body is mainly controlled by the ore stratum， manifested the sign of dipping to the southwest. It is speculated that it may be controlled by the synclinal structure of a hub that is suspected to be developed in the mining area. The ore-forming materials are mainly comes from the high-temperature hydrothermal fluid of submarine volcanic activity. The change of the physical and chemical conditions of the sedimentary environment leads to the precipitation of siliceous and iron elements in turn， forming the original banded siliceous iron formation. After undergoing multiple geological events of structural and metamorphic transformations， striped and banded iron ore is formed. The research results can provide reference for understanding the metallogenic mechanism of Wanzhangzi iron deposit and guiding the iron ore prospecting and exploration in this area. |
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