Petrochemistry and tectonic setting of the Middle Triassic arc-like volcanic rocks in the Sayabouli area, NW Laos

Xin Qian; Qinglai Feng; Yuejun Wang; Wenqiang Yang; Chongpan Chonglakmani; Denchok Monjai

doi:10.1007/s12583-016-0669-5

Volume 27 Issue 3

Jun 2016

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Journal of Earth Science > 2016 > 27(3): 365-377.

Xin Qian, Qinglai Feng, Yuejun Wang, Wenqiang Yang, Chongpan Chonglakmani, Denchok Monjai. Petrochemistry and tectonic setting of the Middle Triassic arc-like volcanic rocks in the Sayabouli area, NW Laos. Journal of Earth Science, 2016, 27(3): 365-377. doi: 10.1007/s12583-016-0669-5

Citation:

Xin Qian, Qinglai Feng, Yuejun Wang, Wenqiang Yang, Chongpan Chonglakmani, Denchok Monjai. Petrochemistry and tectonic setting of the Middle Triassic arc-like volcanic rocks in the Sayabouli area, NW Laos. Journal of Earth Science, 2016, 27(3): 365-377. doi: 10.1007/s12583-016-0669-5

Citation:

Xin Qian, Qinglai Feng, Yuejun Wang, Wenqiang Yang, Chongpan Chonglakmani, Denchok Monjai. Petrochemistry and tectonic setting of the Middle Triassic arc-like volcanic rocks in the Sayabouli area, NW Laos. Journal of Earth Science, 2016, 27(3): 365-377. doi: 10.1007/s12583-016-0669-5

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Petrochemistry and tectonic setting of the Middle Triassic arc-like volcanic rocks in the Sayabouli area, NW Laos

doi: 10.1007/s12583-016-0669-5

Xin Qian^{1, 2},
Qinglai Feng^{1, 2
,
,},
Yuejun Wang^{3, 4},
Wenqiang Yang^{1, 5},
Chongpan Chonglakmani⁶,
Denchok Monjai⁶

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
3.
School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, 510275, China
4.
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China
5.
Wuhan Center of Geological Survey, Wuhan, 430205, China
6.
School of Geotechnology, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand

More Information

Corresponding author: Qinglai Feng, qinglaifeng@cug.edu.cn
Received Date: 03 Aug 2015
Accepted Date: 13 Dec 2015
Publish Date: 10 Jun 2016

Abstract

Abstract

The volcanic rocks from the Sayabouli area in northwestern Laos have been poorly studied. These volcanic rocks are traditionally mapped as the Permian–Early Triassic sequences on the geological map. One basaltic-andesite from the Sayabouli area yields a zircon U-Pb age of 237.7±1.7 Ma, suggesting a Middle Triassic origin. All basalt and basaltic-andesite samples from the Sayabouli area show depletions in HFSEs (e.g., Nb, Ta, Ti) and have high LILE/HFSE ratios, and exhibit the geochemical affinity to the continental arc volcanic rocks and are geochemically similar to the continental arc volcanic rocks from the Phetchabun belt in northeastern Thailand, suggesting a Late Permian–Middle Triassic continental margin in the Sayabouli area of northwestern Laos and Phetchabun area of northeastern Thailand. Our data indicate that the Phetchabun arc volcanic belt through the western Loei sub-belt can be linked to the Sayabouli area in northwestern Laos.
- volcanic rock,
- geochemical characteristics,
- zircon U-Pb age,
- Middle Triassic,
- Sayabouli,
- northwestern Laos

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References(47)

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