长江中下游成矿带安庆-贵池矿集区五横岩体的成岩年代和区域岩浆活动演化研究

被引：19

作者：

刘一男 ^{[1
]}

范裕 ^{[1
]}

严四华 ^{[2
]}

司志远 ^{[2
]}

周涛发 ^{[1
]}

袁峰 ^{[1
]}

机构：

[1] 合肥工业大学资源与环境工程学院

[2] 安徽省地质矿产勘查局地质队

来源：

岩石学报 | 2014年 / 30卷 / 04期

关键词：

五横岩体; 锆石IA-ICP-MS U-Pb定年; 安庆月山矿田; 长江中下游成矿带;

D O I：

暂无

中图分类号：

P588.1 [岩浆岩（火成岩）]; P618.2 [金属矿床（总论）];

学科分类号：

070901 ; 0709 ; 081803 ;

摘要：

五横岩体是长江中下游成矿带中安庆-贵池矿集区月山矿田内重要的中酸性侵入岩体之一。本文对五横岩体中1个辉长闪长岩、3个闪长岩和1个二长闪长岩样品进行了锆石LA-ICP-MS U-Pb定年,得到年龄值为分别为139.6±1.6Ma、139.3±1.3Ma、140.1±1.4Ma、140.0±1.6Ma以及132.9±1.5Ma,表明闪长岩和二长闪长岩为不同期岩浆作用的产物。结合地质特征,将五横岩体划分成两个不同的岩体。基于区内已有的岩石学、地球化学和成矿年代学研究,将月山矿田内侵入岩划分为两期,早期侵入岩主要为闪长岩类,成岩时代为138～140Ma;晚期侵入岩主要为花岗岩和正长岩,具有A型花岗岩的地球化学特征,成岩时代123～126Ma。通过对比分析,认为五横岩体具有较好的矽卡岩型铜金铁矿床成矿潜力,其成岩成矿作用过程发生于区域挤压-拉张过渡的构造背景。

引用

页码：1117 / 1129

页数：13

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