文档介绍：摘 要
济宁铁矿是山东省储量最大的铁矿之一,也是埋深最深的铁矿之一。为了服务深部矿床的勘查找矿,对济宁铁矿的矿床特征与矿床成因研究迫在眉睫。本文从区域地质和济宁岩群特征入手,分析研究矿床形态特征、含铁建造的沉积相和变质作用等,进而总结济宁铁矿的矿床地质特征。利用矿床地质特征、矿床的地球化学特征析等资料,从成矿物质来源、铁的迁移与富集、成矿物理化学条件以及变质作用对矿床的影响等几方面阐述了矿床的成因。
通过以上研究得出,济宁铁矿矿体呈层状或似层状赋存于济宁岩群中,且被两条断层切割,矿石的主要成分为磁铁矿和石英,磁铁矿在矿石中聚合成暗色条带,宽窄不等, 且与石英呈条带-稠密侵染状构造。磁铁石英岩是引起济宁地区重磁异常的主要原因,重磁异常特征反映了矿体的位置与形态。通过济宁铁矿与其他 BIF 的对比,利用矿床地质特征、地球化学特征等对其成因进行了研究,最终得出济宁铁矿是不同于以往发现的 BIF 的新型矿床,其成矿物质主要来源于侵蚀状态下的太古宙克拉通绿岩带,铁的主要运移形式为胶体和真溶液。认为矿床的成因类型为沉积变质型铁矿床,其变质程度低于早前寒武纪的磁铁石英岩铁矿。
关键词:济宁铁矿,矿床,矿床特征,矿床成因,济宁岩群
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Abstract
Jining iron mine is one of the biggest iron mines which is also one of the deepest iron mines in Shandong. It was necessary to study the deposit characteristics and ore genesis of Jining iron mine for serving the exploration of deep ore body. This paper started from regional geology and characteristics of Jining rock group, and explained the deposit characteristics by analyzing deposit′ morphology , sedimentary facies and metamorphic facies. And it recounted the ore genesis by studying ore-forming material source, Migration and Enrichment of iron, metallogenic physical chemical condition and effects of metamorphism.
Through the above study,It could be obtained that the orebody lays in Jining
rock group by stratified or stratiform-like, and cut by two faults, the ponents of iron ore are ite and quartz, ite polymerization into
dark bands and the bands' width are unequal, bands-dense infection structure
which made from ite dark bands and quartz, sericite, chlorite light color bands can be seen. ite-quartzite is the most t important cause to cause the gravity and ic anomaly of Jining area, the characteristics of gravity and ic anomaly reflects the form and position of the orebody. The ore genesis were studied parison of Jining iro mine and the other BIF, and analysised the geological characteristics of deposit and geochemical characteristics. Finally obtained that Jining iro mine is a new type iro mine which is different from the othe BIF whic