庐枞盆地大倪庄铜矿床地质特征、成岩时代及成因探讨

发布时间：2018-02-14 07:34

本文关键词： 斑岩型铜矿围岩蚀变成矿期次 LA-ICP-MS锆石U-Pb定年　出处：《中国地质》2017年01期 　论文类型：期刊论文

【摘要】：大倪庄铜矿是庐枞盆地内部近年来发现的一处小型斑岩型矿床。本次工作以大倪庄铜矿为研究对象,基于详细的野外观察和系统的岩相学、矿相学工作,总结了矿床的蚀变特征,即主要发育:钾硅酸盐化、黄铁绢英岩化、青磐岩化、碳酸盐化蚀变;确定了矿化特征、矿物生成顺序并划分了成矿阶段,即:钾硅酸盐化阶段、硫化物阶段、碳酸盐化阶段,其中硫化物阶段可进一步划分为石英硫化物亚阶段、绿帘石-绿泥石亚阶段。通过对与成矿有关的侵入岩体(正长斑岩)采用LA-ICP-MS锆石U-Pb定年,获得正长斑岩LA-ICP-MS锆石U-Pb年龄为(126.6±1.8)Ma,形成时代为早白垩世,对应于盆地内双庙旋回岩浆侵入活动。通过与其他区域相似矿床对比分析,探究了此类矿床控矿因素,为该地区斑岩型铜矿找矿勘查提供参考。
[Abstract]:The Shannizhuang copper deposit is a small porphyry deposit discovered in recent years in the Luzong basin. This work takes Danizhuang copper deposit as the research object, based on detailed field observation and systematic petrographic and mineralogical work. The alteration characteristics of the deposit are summarized, that is, the main development of the deposit is potassium silicate, yellow sericite, Qingiranite, carbonization and alteration, and the mineralization characteristics, the sequence of mineral formation and the metallogenic stage are determined, that is, the potassium silicate stage. The sulphide stage, carbonization stage and sulfide stage can be further divided into quartz sulphide substage and verdite chlorite substage. LA-ICP-MS zircon U-Pb dating is used for the intrusive rock bodies (syenite porphyry) related to mineralization. The LA-ICP-MS zircon U-Pb age of syenite porphyry is 126.6 卤1.8Ma.The age of formation is early Cretaceous, which corresponds to the magmatic intrusion activity of Shuangmiao cycle in the basin. It provides a reference for the prospecting of porphyry copper deposits in this area.
【作者单位】：合肥工业大学资源与环境工程学院;安徽省地矿局327地质队;
【基金】：安徽省公益性地质工作项目(2011-g-2) 新世纪优秀人才支持计划项目(NCET-10-0324)联合资助~~
【分类号】：P618.41

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