Journal of Earth Science

, Volume 22, Issue 6, pp 688–703 | Cite as

Geochemistry of Middle Triassic radiolarian cherts from northern Thailand: Implication for depositional environment

  • Hathaithip Thassanapak
  • Mongkol Udchachon
  • Chongpan Chonglakmani
  • Qinglai Feng (冯庆来)
Article

Abstract

Geochemical analysis reveals that Middle Triassic radiolarian cherts from northern Thailand, including Chiang Dao, Lamphun and Den Chai, are of biogenic origin. These cherts present slightly high SiO2 content which was possibly modified by diagenetic alteration and migration processes as indicated by negative correlation between SiO2 and most of the other major elements. The relatively high content of Cr, Zr, Hf, Rb and Th and high positive correlation of these elements with Al and Ti from the majority of cherts suggest a close relation to terrigenous component. The Ce anomaly (Ce/Ce*) with geometric means ranging from 0.85 to 0.93 is compatible with that of continental margin composition (0.67–1.52) from Murray et al. (1990) which is also consistent with low Eu anomalies (Eu/Eu*, 0.91–0.94). Moreover, the slightly low ratios of La and Ce NASC normalized (Lan/Cen, 0.91–0.94) and the low LREE and HREE ratios in most of our samples (Lan/Ybn, 0.62–0.85) are in agreement with the continental margin. The result from Lan/Cen vs. Al2O3/(Al2O3+Fe2O3) discrimination diagrams also supports the continental margin (residual basin, s. str.) interpretation. These geochemical results are compatible with geological evidence, which suggest that during the Middle Triassic, radiolarian cherts were deposited within a deeper part of a residual basin in which an accommodation space was possibly controlled by faults under extensional regime subsequent to Late Variscan (Permian) orogeny. Paleogeographically, the main Paleotethys which closed during Late Triassic should be located further to the west of these study localities. This scenario is in agreement with the current view of the Tethys in this part of the world.

Key words

Triassic geochemistry radiolarian chert depositional environment northern Thailand 

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Copyright information

© China University of Geosciences and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Hathaithip Thassanapak
    • 1
  • Mongkol Udchachon
    • 2
  • Chongpan Chonglakmani
    • 3
  • Qinglai Feng (冯庆来)
    • 4
  1. 1.Department of Biology, Faculty of ScienceMahasarakham UniversityMahasarakhamThailand
  2. 2.Palaeontological Research and Education CentreMahasarakham UniversityMahasarakhamThailand
  3. 3.School of Geotechnology, Institute of EngineeringSuranaree University of TechnologyNakhon RatchasimaThailand
  4. 4.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhanChina

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