Geochemical characteristics of the oceanic island-type volcanic rocks in the Chiang Mai zone,northern Thailand |
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| Authors: | Shangyue Shen Qinglai Feng Zhibin Zhang Chonglakmani Chongpan |
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| Institution: | (1) China University of Geosciences, Wuhan, 430074, China;(2) Institute of Regional Geology, Yunnan Bureau of Geology and Mineral Resources, Yuxi, 653100, China;(3) Suranaree University of Technology, Suranaree, Thailand |
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| Abstract: | The oceanic island volcanic rocks in the Chiang Mai zone, northern Thailand, are usually covered by Lower Carboniferous and
Upper Permian shallow-water carbonate rocks, with the Hawaii rocks and potash trachybasalt being the main rock types. The
alkaline series is dominant with sub-alkaline series occurring in few cases. The geochemical characteristics are described
as follows: the major chemical compositions are characterized by high TiO2, high P2O5 and medium K2O; the rare-earth elements are characterized by right-inclined strong LREE-enrichment patterns; the trace element patterns
are of the upward-bulging K-Ti enrichment type; multi-component plots falling within the fields of oceanic island basalts
and alkali basalts, belonging to the oceanic island-type volcanic rocks, which are similar to the equivalents in Deqin and
Gengma (the Changning-Menglian zone) of Yunnan Province, China. |
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| Keywords: | Chiang Mai zone of Thailand Changning-Menglian zone of China oceanic island basalt geochemical characteristic |
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