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Geochemistry of Middle Triassic radiolarian cherts from Northern Thailand:Implication for Depositional Environment

Journal of Earth Science 2011年第6期22卷 688-703页

作者： Hathaithip Thassanapak Mongkol Udchachon Chongpan Chonglakmani 冯庆来 Department of Biology Faculty of ScienceMahasarakham University Palaeontological Research and Education Centre Mahasarakham University School of Geotechnology Institute of EngineeringSuranaree University of Technology State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

Geochemical analysis reveals that Middle Triassic radiolarian cherts from northern Thailand,including Chiang Dao,Lamphun and Den Chai,are of biogenic *** 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 *** 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 *** Ce anomaly（Ce/Ce＊） with geometric means ranging from 0.85 to 0.93 is compatible with that of continental margin composi-tion（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 *** result from Lan/Cen ***2O3/（Al2O3＋Fe2O3） discrimination diagrams also supports the continental margin（residual basin,***.） *** geochemical results are compatible with geological evidence,which suggest that during the Middle Triassic,radio-larian cherts were deposited within a deeper part of a residual basin in which an accommoda-tion space was possibly controlled by faults un-der extensional regime subsequent to Late Variscan（Permian） ***-cally,the main Paleotethys which closed during Late Triassic should be located further to the west of these study *** scenario is in agreement with the current view of the Tethys in this part of the world.

关键词： Triassic geochemistry radiolarian chert depositional environment northern Thailand.

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