| 何峻岭,刘莉茗,张鹏伟,艾书涛,孟李奇.东昆仑阿克苏河地区上三叠统鄂拉山组火山岩地球化学及构造环境研究[J].矿产勘查,2023,14(6):829-838 |
| 东昆仑阿克苏河地区上三叠统鄂拉山组火山岩地球化学及构造环境研究 |
| Geochemistry and tectonic environment of volcanic rocks of Upper Triassic Elashan Formation in aksuhe area， East Kunlun |
| 投稿时间：2022-08-17 修订日期：2022-11-06 |
| DOI：10.20008/j.kckc.202306001 |
| 中文关键词: 鄂拉山组 火山岩 构造环境 东昆仑 |
| 英文关键词: Elashan Formation volcanics tectonic environment East Kunlun Orogen |
| 基金项目:本文受中国地质调查局项目“新疆且末县阿克苏河一带1∶5万区域地质矿产调查”（DD2016007907）资助。 |
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| 中文摘要: |
| 东昆仑阿克苏河地区发育上三叠统鄂拉山组（T3e）火山岩，出露岩石以英安质岩屑晶屑凝灰岩、流纹质岩屑晶屑凝灰岩及英安岩为主，岩石SiO2含量为65.65%~73.28%，Al2O3含量为11.31%~15.58%，K2O+Na2O含量为5.14%~6.05%，属高钾钙碱性系列。岩石LREE/HREE为8.64~11.75，属轻稀土富集型，微量元素Rb、Nb强富集，P、Sr明显亏损。在鄂拉山组英安岩中获得锆石U-Pb同位素年龄值为（227.7±3.1）Ma，形成时代为晚三叠世。综合分析认为鄂拉山组火山岩可能形成于南北向挤压为主的陆-陆后碰撞过程中地壳物质部分熔融的产物，属于后碰撞火山盆地的产物。 |
| 英文摘要: |
| The volcanic rocks of the Upper Triassic Elashan Formation （T3e） were developed in the Aksu River area of East Kunlun. The exposed rocks were mainly Inanitic clastic crystalline tuff， rhyolitic clastic crystalline tuff and Inanite， with SiO2 content of 65.65%-73.28%， Al2O3 content of 11.31%-15.58%， and K2O+Na2O content of 5.14%-6.05%， respectively， and which was belonged to the High potassium-calcium-alkaline series. The LREE/HREE of the rock was 8.64-11.75， which was light rare earth enriched， with strong enrichment of trace elements Rb and Nb， and obvious loss of P and Sr. The zircon U-Pb isotopic age value of （227.7±3.1） Ma was obtained in the Yingan rocks of the Elazan Formation， and the formation age was Late Triassic. It was concluded that the volcanic rocks of the Elazan Formation may have been formed as a product of partial melting of crustal materials in the process of post-continental and post-continental collision， which was dominated by north-south compression. |
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