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Petrogenesis and magma residence time of lavas from Tengchong volcanic field(china):evidence from U-series disequilibria and 40Ar/39Ar dating

Petrogenesis and magma residence time of lavas from Tengchon...

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中国科学院地质与地球物理研究所2006学术年会

作者： Fei WANG state key laboratory of lithosphere tectonic evolution,institute of geology and geophysics,chinese academy of sciences,beijing 100029,china Zicheng PENG Department of Earth and Space sciences,china University of Science and Technology,hefei 230026, china rixiang zhu huaiyu he liekun yang state key laboratory of lithosphere tectonic evolution,institute of geology and geophysics,chinese academy of sciences,beijing 100029,china

We present U-Th disequilibria measurements as well as radiogenic and trace element data for volcanic rocks erupted over the past～200,000 years at Tengchong volcano field(TVF), near the collisional belt of India-Asia,Southwestern *** separates,matrix and whole rock were analyzed separately by mass spectrometry for Th-U *** rocks are characterized either by Th enrichment or depletion relative to *** mineral internal Th age isochrons and a CO-laser Ar/Ar age were determined.A difference of 0 ka between the Th age and the Ar/Ar age can be interpreted as the residence time of the associated magma. Large variations in Sr,Nd,and Pb isotopic compositions and trace element ratios suggest more than one source for the TVF *** Th contents,Th/U ratios and LILE element abundances, as well as their large variations can be attributed to partial melting of mantle previously metasomatized by subduction-derived *** of U in some lavas could be the feature of another end-member,an arc-type melt,in the *** extraction of the melts may result in the observed chemical disequilibrium.

关键词： Tengchong volcanoes 230Th-238U disequilibria Petrogenesis 40Ar/39Ar dating

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