Zircon U-Pb dating of quartz-diorite from Luang Prabang tectonic belt in Laos: Implication for eastward subduction of the Paleo-Tethys Ocean

GUO Linnan; HOU Lin; NIE Fei; LIU Shusheng; Xu Siwei; ZHANG Qiming

doi:10.19826/j.cnki.1009-3850(2020)01-0068-08

Sedimentary Geology and Tethyan Geology > 2020 > 40(1): 68-75. > DOI: 10.19826/j.cnki.1009-3850(2020)01-0068-08

GUO Linnan, HOU Lin, NIE Fei, LIU Shusheng, Xu Siwei, ZHANG Qiming. Zircon U-Pb dating of quartz-diorite from Luang Prabang tectonic belt in Laos: Implication for eastward subduction of the Paleo-Tethys Ocean[J]. Sedimentary Geology and Tethyan Geology, 2020, 40(1): 68-75. DOI: 10.19826/j.cnki.1009-3850(2020)01-0068-08

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Zircon U-Pb dating of quartz-diorite from Luang Prabang tectonic belt in Laos: Implication for eastward subduction of the Paleo-Tethys Ocean

Chengdu Center, China Geological Survey, Chengdu 610081, China

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Received Date: October 20, 2019
Revised Date: January 01, 2020
Published Date: March 29, 2020

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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.
- Zircon U-Pb dating,
- Luang Prabang tectonic zone,
- Quartz diorite,
- Paleo-Tethys Ocean

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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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