Zircon U-Pb dating of quartz-diorite from Luang Prabang tectonic belt in Laos: Implication for eastward subduction of the Paleo-Tethys Ocean
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摘要: 老挝琅勃拉邦构造带位于印支板块西部，是东南亚特提斯域内的重要构造带之一。该地区多期次的岩浆活动记录了多阶段的构造岩浆演化，但与古特提斯洋闭合过程相关的岩浆活动报道相对较少，导致与该过程相关的构造-岩浆-成矿作用关系理解不清。本文在野外地质观察和岩相学研究的基础上，对老挝琅勃拉邦地区石英闪长岩开展了锆石U-Pb LA-ICP-MS定年，分析结果表明，石英闪长岩结晶年龄为260.5±1.8 Ma，表明琅勃拉邦构造带存在中晚二叠世岩浆活动。结合前人研究结果，本文认为该中酸性侵入体很可能是古特提斯洋板片东向俯冲，难河-沙缴弧后盆地关闭过程中岩浆活动的产物，且为琅勃拉邦构造带向南连接至难河-程逸结合带提供了新资料。Abstract: The Luang Prabang tectonic belt in Laos is located in the western of Indo-China Plate, and it is one of the important tectonic belts in Southeast Asia-Tethys domain. Multi-stage magmatic activities in this area recorded multi-stage tectonic-magmatic evolutions. However, there are few reports on magmatic activity related to the closure process of Paleo-Tethys Ocean, thus the relationship of tectonic evolution-magmatism-metallogenesis in the process remain controversial. Based on field geological observations and petrographic studies, this article carried out zircon U-Pb LA-ICP-MS dating of quartz diorite in Luang Prabang, Laos. The results show that the crystalline age of the quartz diorite is 260.5±1.8 Ma, indicating a Middle-Late Permian magmatic activity in the Luang Prabang tectonic belt. Combine with previous studies, we believe the medium-acid intrusive rock is likely to be the product of magmatic activity during the eastward subduction of the Paleo-Tethys Ocean-plate and closure of the Nan-Sra Kaeo backarc basin. It also provides new data indicating that the Luang Prabang tectonic zone may link to the Nan-Uttaradit to the south.
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Key words:
- Zircon U-Pb dating /
- Luang Prabang tectonic zone /
- Quartz diorite /
- Paleo-Tethys Ocean
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