内蒙古赤峰地区二叠纪火山岩的发现及其地质意义

被引：18

作者：

彭斌 ^{[1
]}

王国祺 ^{[1
]}

刘乐 ^{[1
]}

杨勇 ^{[1
]}

刘峰 ^{[2
]}

机构：

[1] 核工业二〇八大队

[2] 成都理工大学

来源：

矿物岩石地球化学通报 | 2016年 / 35卷 / 06期

关键词：

二叠世火山岩; 锆石U-Pb年龄; 岩石地球化学; 赤峰;

D O I：

暂无

中图分类号：

P588.14 [喷出岩（火山岩）];

学科分类号：

070901 [矿物学、岩石学、矿床学];

摘要：

为探讨赤峰西部铭山隆起带上的大面积火山岩的地质意义,对该区开展1︰5万区域矿产地质调查时,通过野外地质调查、岩石学、LA-ICP-MS锆石U-Pb同位素测年及区域地层对比,发现该区火山岩不同于晚侏罗世—早白垩世火山岩,且发育明显的绿色蚀变现象;下部角闪安山岩的测年结果为273.6±2.2Ma,为二叠系额里图组。该区火山岩属钙碱性-高钾钙碱性系列,岩浆经历了矿物的分离结晶过程,是同源岩浆连续演化的产物,具有由底至顶由中基性向中酸性岩浆演化、稀土元素总量逐渐增高的特点。研究认为,该期火山岩的形成与晚古生代古亚洲洋向华北地块的俯冲作用有关,应是太古界至元古代的结晶基底和晚泥盆世岩浆产物的重熔岩浆喷发形成,其形成的构造环境为安山弧。

引用

页码：1329 / 1340

页数：12

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