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- W2374331206 abstract "Volcaniclastic rock on seamount is the product of subaqueous explosive volcanism.This paper explores the geochemical characteristics of basalts in volcaniclastic rock from Daimao seamount,highlighting its geological significance.Samples obtained from Daimao seamount exhibit transitional tholeiites,which represent typical Cenozoic basalt in SCS(South China Sea),with high content of K2O+Na2O(3.10%-4.98%),enriched large ion lithophile elements,moderate enrichment of LREE relative to HREE(with(La/Yb)N ratio between 2.6to 6.7),E-MORB to OIB REE patterns.These basalts from Daimao seamount are in some way similar to wider extended alkali basalts in SCS,and they two formed in inner-plate environment after the cessation of SCS spreading.Seamounts from SCS predominantly consisted of tholeiites basalts since middle Miocene,turning into alkali Basalts after late Miocene.The authors suggest the change from tholeiites to alkali basalts with time may be attributed to the lithosphere Lid Effect because of increasing thickness of the lithosphere.Previous studies indicate the lithospheric mantle beneath the north part of SCS is similar to the Proterozoic/Archean mantle in composition.The lithosphere mantle in and around SCS metasomatized by melts or aqueous fluids,delaminated or thinned by asthenosphere upwelling.These age-old lithosphere mantle materials add into the asthenosphere with fertile incompatible elements,which may be the reason why the basalts from Daimao seamount display enrichment characteristics." @default.
- W2374331206 created "2016-06-24" @default.
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- W2374331206 date "2013-01-01" @default.
- W2374331206 modified "2023-09-23" @default.
- W2374331206 title "Geochemical Characteristics and Its Geological Implications for Basalts in Volcaniclastic Rock from Daimao Seamount" @default.
- W2374331206 hasPublicationYear "2013" @default.
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