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- W2379663086 abstract "Distributed widely in the Lhozag area,southern Tibet,the nearly E-W-trending mafic dike swarms are mainly intruded into Late Jurassic-Early Cretaceous and earlier strata.The U-Pb dating of zircons from dike swarms yielded an age of 138.0±3.5 Ma.The dike swarms are mainly classified into two types.One type is low in K(K2O=0.06-0.54%)and total REE content(∑REE=58.95-115.5×10-6)with weak fractionation of LREE and HREE [(La/Yb)N=0.23-2.94] and depletion of LREE.By contrast,the other type is rich in K(K2O=1.22-1.67%)and total REE content(∑REE=199.97-381.47×10-6)and has strong fractionation of LREE and HREE [(La/Yb)N=6.57-11.5],exhibiting LILE enrichment and HFSE depletion.Geochemical study shows that these dike swarms were intrusions of continental within-plate magmas with the characteristics of continental tholeiitic basalt and may have been derived from the depleted asthenospheric mantle and enriched lithospheric mantle.They are the product of large-scale spreading of the Neo-Tethys ocean in its late stage.The dike swarms indicate that the passive margin of the Himalaya was in a tectonic environment of strong extension and splitting and a dynamic setting of lithospheric extension and thinning and asthenospheric upwelling during the Late Jurassic-Early Cretaceous." @default.
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- W2379663086 date "2007-01-01" @default.
- W2379663086 modified "2023-09-26" @default.
- W2379663086 title "Zircon U-Pb dating and geochemistry of mafic dike swarms in the Lhozag area,southern Tibet,China,and their tectonic implications." @default.
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