长江中下游成矿带九瑞矿集区(北部)含矿岩体的锆石U-Pb定年及其地质意义

被引：55

作者：

陈志洪 ^{[1
]}

邢光福 ^{[1
]}

郭坤一 ^{[1
]}

曾勇 ^{[1
]}

匡福祥 ^{[1
]}

贺振宇 ^{[2
]}

柯学 ^{[1
]}

余明刚 ^{[1
]}

赵希林 ^{[1
]}

张勇 ^{[1
]}

机构：

[1] 中国地质调查局南京地质调查中心

[2] 中国地质科学院地质研究所国土资源部大陆动力学重点实验室

来源：

地质学报 | 2011年 / 85卷 / 07期

关键词：

含矿(Cu-Au)岩体; 锆石U-Pb定年; 九瑞矿集区; 长江中下游成矿带;

D O I：

暂无

中图分类号：

P597.3 [];

学科分类号：

摘要：

江西九(江)-瑞(昌)地区是长江中下游铜-铁-金(硫)成矿带的一个重要的矿集区,位于成矿带的西段。本文选取了区内研究程度相对薄弱的丁家山、洋鸡山、宝山、铜岭和大浪等5个与Cu-Au成矿作用密切相关的花岗质岩体,首次进行了锆石LA-ICP-MS U-Pb年龄测定,并讨论其地质意义。测年结果显示,上述岩体分别形成于145.4±1.2 Ma、144.8±1.3 Ma、143.6±1.2 Ma、141.2±1.3 Ma和146.4±1.2 Ma,为晚侏罗世-早白垩世岩浆活动的产物。结合区域地质资料,认为九瑞矿集区内这一成岩-成矿地质事件可能与古太平洋板块俯冲挤压造山作用后期整体向弧后伸展环境过渡的地球动力学机制有关。是否为区域性加厚下地壳、拆沉下地壳部分熔融或洋脊俯冲作用的产物,还有待进一步研究。

引用

页码：1146 / 1158

页数：13

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