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Journal of Earth Science

, Volume 27, Issue 3, pp 365–377 | Cite as

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

  • Xin Qian
  • Qinglai FengEmail author
  • Yuejun Wang
  • Wenqiang Yang
  • Chongpan Chonglakmani
  • Denchok Monjai
Article

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.

Key words

volcanic rock geochemical characteristics zircon U-Pb age Middle Triassic Sayabouli northwestern Laos 

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Copyright information

© China University of Geosciences and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Xin Qian
    • 1
    • 2
  • Qinglai Feng
    • 1
    • 2
    Email author
  • Yuejun Wang
    • 3
    • 4
  • Wenqiang Yang
    • 1
    • 5
  • Chongpan Chonglakmani
    • 6
  • Denchok Monjai
    • 6
  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhanChina
  2. 2.School of Earth SciencesChina University of GeosciencesWuhanChina
  3. 3.School of Earth Science and Geological EngineeringSun Yat-sen UniversityGuangzhouChina
  4. 4.CAS Center for Excellence in Tibetan Plateau Earth SciencesBeijingChina
  5. 5.Wuhan Center of Geological SurveyWuhanChina
  6. 6.School of GeotechnologySuranaree University of TechnologyNakhon RatchasimaThailand

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