Geochemical characteristics of the oceanic island- type volcanic rocks in the Chiang Mai zone, northern Thailand

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.

作 者： SHEN Shangyue FENG Qinglai ZHANG Zhibin CHONGPAN Chonglakmani   作者單位： SHEN Shangyue,FENG Qinglai(China University of Geosciences, Wuhan 430074, China)

ZHANG Zhibin(Institute of Regional Geology, Yunnan Bureau of Geology and Mineral Resources, Yuxi 653100, China)

CHONGPAN Chonglakmani(Suranaree University of Technology, Thailand) 

刊 名： 中國地球化學學報（英文版）  英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY  年，卷(期)： 2009 28(3)  分類號： P5  關鍵詞： Chiang Mai zone of Thailand   Changning-Menglian zone of China   oceanic island basalt   geochemical characteristic  

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