李江涛;何学锋;杨鹏涛;刘亮;梁斌;苏画;杨宇东;陈围;江辉;侯可军;

• 1:四川省地质矿产勘查开发局川西北地质队
• 2:乐山市国土资源局
• 3:西南科技大学环境与资源学院
• 4:中国地质科学院矿产资源研究所

摘要(Abstract)：

博格达造山带广泛分布着基性侵入岩体,其成因对正确认识该区地球动力学背景具有重要意义。对位于博格达造山带西段的基性侵入岩体分别进行了岩石学、岩石地球化学以及LA-ICP-MS锆石U-Pb年代学的研究,从而探讨其岩石成因及构造意义,以期为解决博格达造山带的地质构造演化提供依据。岩石地球化学分析结果显示,基性侵入岩w(SiO2)介于48.08%~50.88%之间,全碱(ALK)质量分数为3.09%~4.39%(小于5%),富CaO(6.87%~11.41%)、贫Al2O3(12.59%~18.49%),w(MgO)介于3.78%~7.66%之间,Mg#值为31.75~65.73(均值为51.29),铝饱和指数值A/CNK为0.60~0.80,属准铝质中钾钙碱性岩石系列。岩石总稀土元素质量分数较低,且轻重稀土元素之间以及轻重稀土元素内部不存在明显的分馏过程;微量元素中Th、Ta、Nb元素明显亏损,Ti元素亏损不明显以及U元素轻微富集,反映岩石具大陆裂谷岩浆活动特点。有关微量元素、稀土元素的相关图解及其比值,指示该区基性侵入岩岩浆源于亏损的岩石圈地幔,侵位过程中受到了地壳物质的混染,分异演化程度较低,为原始尖晶石相橄榄岩经较高程度的部分熔融的产物,形成于板内裂谷的构造环境。此外,辉长岩LA-ICP-MS锆石U-Pb定年结果表明,其形成年龄为(305.0±1.6)Ma(晚石炭世末期),处于博格达裂谷火山活动期晚期,为博格达西段裂谷作用由全面伸展向局限伸展转换的标志。综合对比区域研究成果,认为晚古生代期间(早石炭世-早二叠世),博格达造山带存在大面积与真正裂谷演化有关的岩浆活动,造山带是在裂谷基础上发展起来的,其形成可能与古亚洲洋沿克拉麦里碰撞带向准-吐-哈地块斜向俯冲作用有关。

关键词(KeyWords)： 博格达造山带;基性侵入岩;地球化学;LA-ICP-MS锆石U-Pb定年;大陆裂谷;古亚洲洋

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41472310);; 新疆维吾尔自治区地质勘查基金项目“新疆东天山甘河子一带1∶5万区域地质矿产调查”(A14-1-LQ03)

作者(Author): 李江涛;何学锋;杨鹏涛;刘亮;梁斌;苏画;杨宇东;陈围;江辉;侯可军;

Email:

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