| 刘云龙.大喀拉苏伟晶岩的成因:来自锆石 U-Pb和 Hf同位素的证据[J].矿产勘查,2025,16(12):2549-2558 |
| 大喀拉苏伟晶岩的成因:来自锆石 U-Pb和 Hf同位素的证据 |
| The genesis of the Dakalasu pegmatite: Evidence from zircon U-Pb and Hf isotopes |
| 投稿时间：2025-04-27 |
| DOI：10.20008/j.kckc.202512001 |
| 中文关键词: 大喀拉苏 伟晶岩成因 锆石 U-Pb Hf同位素 中亚造山带 |
| 英文关键词: Dakalasu pegmatite genesis zircon U-Pb Hf isotopes Central Asian Orogenic Belt |
| 基金项目:本文受贵州省省级科技计划项目(ZK[2022]-023)资助。 |
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| 中文摘要: |
| 作为中亚造山带的重要组成部分，阿尔泰造山带内广泛发育花岗岩类岩石，伟晶岩脉也多达十余万条。对花岗岩及伟晶岩的形成时代、源区性质及其大地构造背景的研究，在研究花岗岩及伟晶岩的成因关系、花岗岩及伟晶岩在大陆动力学研究中的作用等具有非常重要的意义。大喀拉苏伟晶岩脉位于阿尔泰造山带，其侵入年代与物质来源目前尚未确定，本文对大喀拉苏伟晶岩进行了岩石学、锆石 U-Pb年代学及锆石 Hf同位素研究，研究结果表明，大喀拉苏伟晶岩为 LCT型伟晶岩，其侵位于(268.2±3.0)Ma，与二叠纪岩浆活动有关，锆石 Hf同位素排除了大喀拉苏伟晶岩和邻区花岗岩之间的成因联系。结合已有研究成果，大喀拉苏伟晶岩可能是高温变质过程中，古老地层深熔作用的产物。 |
| 英文摘要: |
| The Altay Orogenic Belt is an important component of the Central Asian Orogenic Belt. Within theAltay Orogenic Belt, granites are widely distributed, and there are over a hundred thousand pegmatite veins. Re-search on the formation ages, source characteristics, and tectonic settings of these granites and pegmatites holds sig-nificant importance for understanding their genetic relationships and their roles in continental dynamics studies.The Dakalasu pegmatite pluton is situated in the Altai orogenic belt, but its emplacement age and material sourcesremain uncertain. This study conducted petrographic, zircon U-Pb geochronological, and zircon Hf isotopic investi-gations on the Dakalasu pegmatite. The results demonstrate that the Dakalasu pegmatite belongs to the LCT-typepegmatite category, intruding at (268.2±3.0) Ma during Permian magmatic activity. Zircon Hf isotopic data excludea genetic link between the Dakalasu pegmatite and granitic rocks. Integrated with existing research findings, it isproposed that the Dakalasu pegmatite likely originated from anatexis of ancient strata during high-temperaturemetamorphic processes. |
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