Geochemical Characteristics of Triassic Granites in Hongyuan Area, Sichuan Province, and Their Geological Significance

• 责任者：Bai Xianzhou (Chengdu University of Technology ; Chengdu 610059 ; China) ; He Mingyou
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2010
• 卷期：29(5)
• 关键词：花岗岩 ; granite ; 四川 ; Sichuan Province
• 页码：p.479-487
• 图表：6 illus., 2 tables, 21 refs.
• 分类号：0801
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

Located in northern Songpan-Garzê orogenic belt and intruding into Triassic Xikang Group mainly comprising sandstone and slate, the Hongyuan granites are composed of medium-fine grained granodiorite and monzogranite. Geochemical analyses show that they have high SiO₂ (62.36%～73.7%) and Al₂O₃ (13.84%～16.69%) content, low TiO₂ (0.18%～0.72%), Na₂O (2.64%～4.43%) and K₂O (2.24%～5.07%) content, and similar Na and K content. Based on Hf-Rb/10-Ta×3 triangular diagram and Rb-(Y+Nb) discrimination diagram, the authors reached the conclusion that the granites might formed in an collision environment after the main intracontinental collision and required an underplating or intraplating scheme of mantle-derived magma.