Characteristics of the Oceanic Island-Type Volcanic Rocks in the Chiang Mai Zone, Northern Thailand

• 责任者：Shen Shangyue (China University of Geosciences ; Wuhan 430074 ; China) ; Feng Qinglai
• 刊名：Journal of Mineralogy and Petrology
• 出版年：2010
• 卷期：30(1)
• 关键词：洋岛玄武岩 ; ocean-island basalts ; 泰国 ; Thailand
• 页码：p.26-30
• 图表：7 illus., 3 tables, 14 refs.
• 分类号：0801
• issnNo：ISSN1001-6872
• isbnNo：CN51-1143/TD

The oceanic island volcanic rocks in the Chiang Mai zone, northern Thailand, were usually covered by Lower Carboniferous and Upper Permian shallow-water carbonate rocks, with the Hawaii rocks and potash trachybasalt being the main rock types. Alkaline series was dominant with sub-alkaline series occurring in few cases. Geochemical characteristics of the rocks were described as follows: the major chemical compositions were characterized by high TiO₂, P₂O₅, and medium K₂O. Rare-earth elements were characterized by right-inclined strong LREE-enrichment patterns and the trace element patterns were of the upward-bulging K-Ti enrichment type.