枞阳县石矶测区东马鞍山组磁铁矿层的发现及找矿意义
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摘要
在庐枞火山岩盆地南缘外侧晚燕山期正长-花岗岩类侵入岩与盆缘基底地层接触带部位地质勘查工作中,枞阳县石矶测区ZK402孔发现了中三叠统东马鞍山组碳酸盐岩富铁层位和顺层磁铁矿体,见矿厚9.65米。矿石类型以块状磁铁矿为主,见有充填和交代残余结构,富矿层位和围岩伴有褐铁矿化(赤铁矿化)、硅化、碳酸盐化和绿泥石化等,表明铁矿体系受层控和热液叠加改造共同作用成矿。进一步印证了东马鞍山组富铁层位在沿江地区以及庐枞火山岩盆缘铁矿成矿的普遍性。
During a geological survey in the contact between the late Yanshanian syenite-granitoid intrusion and the basement outside the southern fringe of the Lu-Zong volcanic basin,an iron-rich horizon and bedded magnetite ore body was found in the ZK402 core intersection of 9.65m in thickness in the mid-Triassic Dongmaanshan Formation of carbonatite.Ore is dominantly massive magnetite with filling and replacement relic texture,and the ore-rich horizon and wall rock are associated with limonitization(hematization),silication,carbonatation and chloritization,indicating that mineralization is a combined result of strata bounding and hydrothermal superimposition,and then attesting to the universality of the Dongmaasnhan Formation of iron-rich horizon in forming iron ore deposits in the area along the Yangtze River and in the fringe of the Lu-Zong volcanic basin.
During a geological survey in the contact between the late Yanshanian syenite-granitoid intrusion and the basement outside the southern fringe of the Lu-Zong volcanic basin,an iron-rich horizon and bedded magnetite ore body was found in the ZK402 core intersection of 9.65m in thickness in the mid-Triassic Dongmaanshan Formation of carbonatite.Ore is dominantly massive magnetite with filling and replacement relic texture,and the ore-rich horizon and wall rock are associated with limonitization(hematization),silication,carbonatation and chloritization,indicating that mineralization is a combined result of strata bounding and hydrothermal superimposition,and then attesting to the universality of the Dongmaasnhan Formation of iron-rich horizon in forming iron ore deposits in the area along the Yangtze River and in the fringe of the Lu-Zong volcanic basin.
引文
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[3]安徽省地质矿产局,中华人民共和国区域地质调查报告(1∶5万义津桥幅、枞阳县幅、汤沟镇幅)[R].1985.
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