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- W2349231071 abstract "Major,Trace element and Sr-Nd-Pb isotope data of Late Mesozoic volcanic rocks from the northern Da Hinggan Mountain,NE China are reported in this paper.The basaltic-andesites occurring in the Manketou'ebo Formation(Fm) belonging to low-K calc-alkaline series,Which show LILE,LREE enrichment and HFSE depletion.They have slightly high radiogenic Sr-Pb(87Sr/86Sr=0.704 88～0.704 99;206Pb/204Pb=18.18～18.23) and are slightly depleted to enriched in Nd isotope(eNd(t)=-0.12～+0.68) attributed to the participation of sediments in the mantle source.The dacites and rhyolites of the Manketou'ebo Formation have higher radiogenic Sr,Pb(87Sr/86Sr=0.705 22～0.707 09;206Pb/204Pb=18.16～18.33)and lower radiogenic Nd isotopic compositions(eNd(t)=-1.5～-0.4) than the contemporaneous basaltic lavas.This resulted from the differentiation of primary basaltic magmas and assimilation and fractional crystallization(AFC).The dacites of the Manitu Formation have the signatures of modern adakites from the subduction zones.Compared with the basaltic lavas,they have lower radiogenic Sr,Pb(87Sr/86Sr=0.704 09～0.704 25;206Pb/204Pb=18.15～18.17) but higher radiogenic Nd isotopic compositions(eNd(t)=+0.9～+2.1),arguing against an origin of differentiation of the contemporaneous basalts.These rocks are considered as melts of mafic protoliths from the lower crust beneath the orogen under the heating of the underplating basaltic magmas." @default.
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- W2349231071 date "2009-11-25" @default.
- W2349231071 modified "2023-09-24" @default.
- W2349231071 title "Origin of Late Mesozoic Volcanic Rocks from the Southern Da Hinggan Mountain, NE China (II): Constraints of Pb Isotope" @default.
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