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 作者单位： 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： 中国地球化学学报（英文版） 英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY 年，卷(期)： 2009 28(3) 分类号： P5 关键词： Chiang Mai zone of Thailand Changning-Menglian zone of China oceanic island basalt geochemical characteristic