老挝西北部二叠纪砂岩碎屑锆石U-b年代学、地球化学特征及其构造意义

邱曦; 王岳军; 钱鑫; 张玉芝; VongpaseuthSenebouttalath

doi:10.3799/dqkx.2020.379

Volume 46 Issue 11

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(11): 3910-3925

Qiu Xi, Wang Yuejun, Qian Xin, Zhang Yuzhi, Vongpaseuth Senebouttalath, 2021. Detrital Zircon U-Pb Geochronology and Geochemical Characteristics of Permian Sandstones in NW Laos and Its Tectonic Implications. Earth Science, 46(11): 3910-3925. doi: 10.3799/dqkx.2020.379

Citation:

Qiu Xi, Wang Yuejun, Qian Xin, Zhang Yuzhi, Vongpaseuth Senebouttalath, 2021. Detrital Zircon U-Pb Geochronology and Geochemical Characteristics of Permian Sandstones in NW Laos and Its Tectonic Implications. Earth Science, 46(11): 3910-3925. doi: 10.3799/dqkx.2020.379

Citation:

Qiu Xi, Wang Yuejun, Qian Xin, Zhang Yuzhi, Vongpaseuth Senebouttalath, 2021. Detrital Zircon U-Pb Geochronology and Geochemical Characteristics of Permian Sandstones in NW Laos and Its Tectonic Implications. Earth Science, 46(11): 3910-3925. doi: 10.3799/dqkx.2020.379

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Detrital Zircon U-Pb Geochronology and Geochemical Characteristics of Permian Sandstones in NW Laos and Its Tectonic Implications

doi: 10.3799/dqkx.2020.379

Qiu Xi^{1, 2
,
,},
Wang Yuejun^{1, 2},
Qian Xin^{1, 2
,
,},
Zhang Yuzhi^{1, 2},
Vongpaseuth Senebouttalath³

1.
Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
2.
Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519082, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-12-19
Available Online: 2021-12-04
Publish Date: 2021-11-30

Abstract

Abstract

The sedimentary evolution history of Northwest Laos has not been well defined. Therefore, it studied the petrology, geochemistry and detrital zircon U-Pb geochronology systematically by using four sandstone samples collected from the well-exposed strata of Permian in NW Laos. Petrography shows that this set of samples mainly includes feldspathic quartz sandstone, lithic sandstone and greywacke. Whole-rock geochemical analyses suggest that these samples are characterized by high SiO₂ (64.9%-91.2%), high Al₂O₃ content (5.0%-17.4%) and high CIA index (59.6-89.9), indicating that they have undergone moderate to strong weathering. Moreover, the trace elements of these samples reveal that the sediment provenance includes felsic rocks from an active continental margin or continental arc with minor amounts of recycled materials. Detrital zircon U-Pb ages suggest 5 significant peaks: 1 880-1 870 Ma, 1 470-1 450 Ma, 890-860 Ma, 450-415 Ma and 275-252 Ma. The youngest age spectrum of all the detrital zircons is 275-252 Ma, which constrains the deposited age to the Late Permian. Based on our studies and comparisons through the detrital zircons from adjacent basins, it proposes that the Pre-Silurian zircons were mainly originated from the recycled sediments of the Yangtze block, the Silurian to Permian detrital zircons were originated from the Truong Son, Changning-Menglian, Lincang-Sukhothai zones and Golden Triangle region. It is proved that the northern margin of the Indochina block and Simao block was a whole during the Paleotethys evolution period. Northern Indochina block showed affinity to Yangtze block in the Permian period.
- Northern Laos,
- Permian,
- detrital zircon,
- provenance analysis,
- geochemistry

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References(89)

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Detrital Zircon U-Pb Geochronology and Geochemical Characteristics of Permian Sandstones in NW Laos and Its Tectonic Implications

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