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《Journal of Northwest University(Natural Science Edition)》 2009-05
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Geochemistry and signification of the Minle volcanic rocks in Jinggu County,Yunnan Province

LI Xue-jun(State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi′an 710069,China)  
Aim To explore the formation mechanism of Late-Triassic volcanic rocks in the Minle area,Yunnan Province.Methods Field observation,petrographical description and geochemical analysis on the whole rocks was used.Results The basalts and sites exhibit the typical geochemical features of island arc rocks: i.e.,enriched in K,Th,U,La and other lithophile elements,remarkable depletion of Nb and Ta.Also,the La/Nb,Nb/Th,Ta/Yb,Th/Yb,La/Yb,Ti/Zr and Ti/Y ratios of the Minle volcanic rocks indicate that they may formed in a active continental marginal arc setting.Conclusion It can be concluded that these intermediate and basic volcanic rocks was a delayed type formed in a intra-continent setting after the collisional orogeny between the Baoshan block and the Changdu-Simao block.
【Fund】: 国家自然科学基金资助项目(40872060)
【CateGory Index】: P588.14
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