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- W2364201469 abstract "Small scale OIB-type picritic porphyrite,comprising olivine,clinopyroxene and plagioclase,outcrops in Jianchuan area,western Yunnan,and the olivine is predominantly chrysolite with the Mg# up to 88.8.The bulk-rock composition is characterized by relatively low SiO2(43%~48%) but high MgO(12%~24%) content.On the basis of the principle of the olivine-melt equilibrium,we conclude that their parental magma is picritic(MgO=13%,FeO=10%).The normalized rare-earth element(REE) patterns of picritic porphyrite is similar to that of ocean island basalts(OIB),rich in light rare-earth element(LREE) and large ion lithophile element(LILE) as well.In addition,melt and spinel inclusions have been recognized in the phenocryst olivine.The spinel inclusions are relatively enriched in Cr with the maximum Cr# of 69.0,and have low Al2O3(12.5%~18.6%) and high TiO2(0.2%~1.7%) contents.The result of modelling of the trace elements implied that the picritic magma was derived from the asthenospheric garnet-bearing peridotite which had experienced relatively low degree of partial melting(4%~7%) under the condition of high temperature and pressure(T≈1470℃,P≈2.7GPa).Taking the regional geological setting into consideration,we infer that the deep dynamic mechanism refers to the partial melting of upwelling asthenosphere due to the open of slab window,which probably had been triggered by the break-off of the India slab subducted at a high-angle bebeath the Eurasia plate." @default.
- W2364201469 created "2016-06-24" @default.
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- W2364201469 date "2011-01-01" @default.
- W2364201469 modified "2023-10-03" @default.
- W2364201469 title "OIB-type picritic porphyrite from Jianchuan in the western Yunnan Province:Results of break-off of the subducting plate?" @default.
- W2364201469 hasPublicationYear "2011" @default.
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