山东淄博金岭杂岩体分布区深部富铁矿资源潜力及找矿方向

深部找矿是目前研究和勘查的热点领域.金岭杂岩体侵入于古生代灰岩中,是燕山运动晚期的产物,与其有关的铁成矿作用是内生铁成矿典型事件之一,形成了金岭富铁矿集区.矿集区目前已发现铁矿体主要分布在-500 m以浅,矿山开采面临资源枯竭的严峻形势,深部找矿亟待突破.区内矿体按赋存介质及空间分布可划分为岩体/地层接触带式、假整合/层间裂隙式、岩体内捕虏体式三种型式.重、磁、电、地综合指示,其深部和外围依然具有优越的矽卡岩型富铁成矿条件,有利找矿深度可延伸至1.3 km,资源潜力大.通过可控源音频大地电磁测深、重磁反演技术对深部和外围成矿地质体的反映,优选出了研究区深部和外围的主要有利找矿区,分别建立了金岭杂岩体两侧矽卡岩型富铁矿地质地球物理综合找矿模型,以期为实现研究区深部和外围找矿发现及相似区域的找矿工作提供理论指导.

Iron- rich ore exploration potential and favorable sites for deep horizon of Jinling magmatic complex distribution in Zibo, Shandong Province

At present, deep prospecting has become a research and exploration hotspot. The Jinling magmatic complex that invades the Paleozoic limestone is one of the typical events of endogenous iron mineralization in the late Yanshan Movement, forming the Jinling iron- rich ore concentration area. The iron ore bodies found in the research area are distributed mainly above altitude -500 m up to now, and the mining industry faces resource depletion necessitating abreakthrough indeep prospecting. Based on the occurrence and spatial distribution, the ore bodies in the research area can be divided into three types: rock mass/stratum contact zone type, disconformity/ interstratified fissure type and xenolithic type. Based on gravity, magnetism, electrical properties and geological evidence, the skarn- type iron- rich metallogenic conditions for the deep and peripheral areas are still favorable, and the favorable burial prospecting space with great resource potential can be extended to 1. 3 km. Based on the characteristics of the deep and peripheral mineralizing geologic bodies reflected by the CSAMT and gravity and magnetic inversion, the deep and peripheral favorable prospecting areas were outlined and the geological and geophysical comprehensive prospecting models were built for both sides of the Jinling magmatic complex. These results will provide data based guidance for the deep and peripheral prospecting breakthrough and prospecting work in other similar areas.