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Nd-Sr-Pb isotopes of Tengchong Cenozoic volcanic rocks from western Yunnan,China:evidence for an enriched-mantle source

M.Satir  
【摘要】:正Tengchong Cenozoic volcanic activity in the southeastern Himalayan belt of western Yunnan is considered to be rift-related after the Indo-Eurasia collision.In this study,Nd-Sr-Pb isotopic compositions were analyzed in order to understand the genesis of the Cenozoic volcanic rocks.Five basalts and andesitic basalts are characterized by high ~(87)Sr/~(86)Sr ratios(0.7057-0.7081), low e_(Nd)-values(-1.1 to -5.7),and particularly high ~(208)Pb/~(206)Pb ratios(1.08-1.12).Twenty samples of rocks,which include granite,granodiorite,and amphibolite from the same region,were analyzed to evaluate the role of contamination and assimilation in the volcanic rocks.Granites have high ~(87)Sr/~(86)Sr ratios and low eNd values,indicating a crustal origin.Granodiorites have~(87)Sr/~(86)Sr ratios of 0.7069-0.7100 and e_(Nd)-values of -2.9 to -7.6 that indicate contribution of a mantle component. Amphibolites that are characterized by high e_(Nd)-values of 9.4 to -1.7 may represent remnants of obducted oceanic crust of the Neo-Tethyan basin.The volcanic rocks are distinguished from the granitoids and amphibolites in terms of Pb isotopic compositions.This observation probably implies that crustal contamination played a minor role in the origin of the volcanic rocks.Isotopic evidence for the volcanic rocks indicates that they probably originated from melting of an enriched-mantle source,that is,ascribed to assimilation of subducted oceanic crust and sediments.
【作者单位】:Institut fur Mineralogie,Petrologie und Geochemie,Universitat Tu bingen
【分类号】:P588.14;P542.5

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