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- W2389394704 abstract "The Songpan-Ganze block is located in southwest of China.It is joined with the North China block,Tibet Plateau and Yangtze block in north,west and southeast.For the outcrop in the area,the content of SiO_2 varies largely from 48.64% to 71.77%,the content of steady elements(Al_2O_3,Fe_2O_3,MnO)is equal to that of unsteady elements(MgO,K_2O,Na_2O),the value of CIW is very low;the value of La/Co concentrates in 3.0～4.5,Th/Co 1.0～1.5,La/Th 2.7～3.1,Th/U＞4.0,∑LREE＞∑HREE,Eu has negative abnormity,REE pattern is similar to upper crust.The U-Pb ages of zircon concentrate in 1500～1900Ma,700～900Ma、200～400Ma,consistent with magmatism activities in Yangtze block and southern Qinling.Our study demonstrates the Songpan-Ganze block had a steady origin mainly Yangtze block.Its composition of detrital mineral was felsic mainly from upper crust.The block had stayed in continent island arc setting in Triassic.Its adjacent blocks were steady no tectonic movements,no magma events.The subduction of Yangtze block towards Northeastern China block became weak or stopped possibly,the movement of Qinling orogen had completed." @default.
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- W2389394704 date "2006-01-01" @default.
- W2389394704 modified "2023-09-24" @default.
- W2389394704 title "Geochemical characteristics and significance of Triassic sandstones of Songpan-Ganze block." @default.
- W2389394704 hasPublicationYear "2006" @default.
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