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- W2364875880 abstract "Xiaohongshan intrusive in Qimantag Mountain, southeastern of Xinjiang, mainly consists of potash feldspar granites. The major component of Xiaohongshan intrusive is peraluminous (A/NKC=1.03～1.06, with an average of 1.05) and is characterized by high silica content (SiO2 76%), high alkaline (K2O+Na2O= 7.77%～IMG SRC=IMAGE/01170013.JPG HEIGHT=11 WIDTH=338.22%), rather high ratio of FeOT/MgO (9.4～21.7), low content of CaO, MgO, TiO2 and P2O5 (0.78%, ≤0.14%, ≤0.1%and ≤0.02%, respectively). The trace element and REE compositions show the feature of high quantity of REE, Rb, U, Th, Y, Zr, Nb,Hf, Yb, depletion of Eu, Ba, Sr, Cr, Ni, and the ×Ga/Al ratios, changing from2.72 to 3.24, are obviously higher than that of I and S type granites average (2.1 and 2.28, respectively). These characteristics are quite similar to those of typical A type granites such as Mumbulla granitoid and alumious A typegranites in the coastal area of Fujian Province. Evidences from petrology and geochemistry and discrimination diagrams, Nb Y Ce triangle diagram as well asR1 Ga/Al, all show that the Xiaohongshan granite falls into aluminous A2 type granites. According to the R1 R2 diagram Xiaohongshan intrusive was formed under the tectonic setting of post orogenic extension. Xiaohongshan intrusive,of which an Rb Sr isochron age of (212±7) Ma is obtained, was formed duringthe period of Later Triassic, and was consistent with A type granite outcropping widely in the East Kunlun orogenic belt and the rhyolite outcropping widely in the southern margin of the Qaidam massif. Therefore, the determination of Xiaohongshan A type granite in Qimantag shows that Qimantag tectonic belt, formedby the collision, was one part of the East Kunlun orogenic belt." @default.
- W2364875880 created "2016-06-24" @default.
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- W2364875880 date "2001-01-01" @default.
- W2364875880 modified "2023-09-25" @default.
- W2364875880 title "Determination and preliminary study of Indosinian aluminous A-type granitesin the Qimantag area, southeastern Xinjiang" @default.
- W2364875880 hasPublicationYear "2001" @default.
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