• 责任者：Luo Jinhai (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Zhang Jingyi
• 刊名：Chinese Journal of Geology
• 出版年：2010
• 卷期：45(1)
• 关键词：花岗岩 ; granite ; 板块碰撞 ; plate collision ; 塔里木盆地 ; Tarim Basin
• 页码：p.66-79
• 图表：8 illus., 2 tables, 44 refs.
• 分类号：0801
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

The Kuoshibulak granites located in the northwestern margin of the Tarim Basin are high-K calc-alkaline series，and rich in alkali (Na₂O+K₂O averages 8.36％>8％）and (K₂O/Na₂O=1.27～1.47)，with the A/CNK values between 0.82 and 0.88，which fall into the range of metaluminous rocks. The geochemical features of the rocks are similar to that of A-type granites. Rb-Th richment，Ti-depletion and the elemental ratios of the Kuoshibulak granites，such as the Th/U (averages 3.86)，Nb/Ta (averages 12.75) indicate that it probably derived from crustal source.  The Kuoshibulak A-type granites also suggested that the collisional orogeny in the southwestern Tianshan probably finished before (275.4±2.8) Ma，and the paleo-Asia ocean represented by the southern Tianshan ocean is closed at that time.