| 伏多旺,王元元,吕俊维.西准谢米斯台南麓白杨河西早二叠世A型流纹岩地球化学、年代学特征及意义[J].地质找矿论丛,2025,40(2):235-242 |
| 西准谢米斯台南麓白杨河西早二叠世A型流纹岩地球化学、年代学特征及意义 |
| Geochemical and chronological characteristics and the significance of early Permian A-type rhyolite in the west of Baiyang River on the southern Xiemisitai piedmont, western Junggar area |
| 投稿时间：2025-01-01 修订日期：2025-04-16 |
| DOI：10.6053/j.issn.1001-1412.2025.02.011 |
| 中文关键词: 谢米斯台南麓 早二叠世 流纹岩 地球化学 西准噶尔 |
| 英文关键词:the southern Xiemisitai piedmont early Permian rhyolite geochemistry western Junggar area |
| 基金项目:新疆维吾尔自治区地质勘查基金项目"新疆和丰县白杨镇一带1∶5万L45E010004、L45E010005、L45E010006、L45E010007、L45E010008五幅区域地质调查(编号:A16-1-LQ03)"资助。 |
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| 中文摘要: |
| 西准噶尔地区是中亚造山带的重要组成部分,岩浆岩出露广泛。本文以西准噶尔地区白杨河上游莎勒克腾北侧下二叠统哈尔加乌组流纹岩为研究对象,进行岩石学、锆石U-Pb年代学研究,探讨其形成背景,以期为区域构造演化提供新的依据。研究表明,下二叠统哈尔加乌组岩性组合主要为流纹岩、凝灰岩等,其流纹岩锆石LA-ICP-MS U-Pb年龄为289.9 Ma±4.9 Ma,形成时代为早二叠世,具有钙碱性、高硅、低钙、准铝,亏损Ti、Nb、Ta,富集Zr等特征,属准铝质钙碱性系列,显示出陆源特点,具A2型花岗岩特征。综合区域资料分析认为,其形成于碰撞后伸展构造。 |
| 英文摘要: |
| The West Junggar area is an important part of the Central Asian orogenic belt with extensive exposure of magmatic rocks. This paper deals with petrology and zircon U-pb chronology of the rhyolite of the lower Permian Haerjiawu Formation on the north side of the Shaleketeng in the upper reaches of the Baiyang river and discusses the formation background of the rhyolite and provides evidence of regional tectonic evolution. The lithological assemblage of the Lower Permian Haerjiawu Formation is mainly rhyolite, tuff, etc.The age of the rhyolite zircon LA-ICP-MS U-Pb is 289.9 Ma ± 4.9 Ma,corresponding to early Permian Epoch, The rhyolite belongs to Ca-alkaline series,characterized by high silicon, low calcium, quasi-aluminum, Ti, Nb, Ta depletion,Zr enrichment, A2 type of granite,and terrigenous source materials. According to the comprehensive regional data analysis, it was formed by the post-collision extension structure. |
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