• 责任者：Zhang Hongrui (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Yang Tiannan
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(11)
• 关键词：糜棱岩化 ; mylonitization ; 石英闪长岩 ; quartz diorite ; 铀—铅计时 ; U-Pb dating ; 氩—氩计时 ; Ar-Ar dating ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.3871-3882
• 图表：9 illus., 4 tables, 49 refs.
• 分类号：0802
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     The tectonic evolution model of the west segment of the Jinshajiang Paleo-tethyan are hotly debated. Located in the northern margin of the eastern Qiangtang block （ EQ ）, the Yushu m61ange is very important for understanding the Paleo-tethyan evolution. Zircon U-Pb and biotite 40Ar/39Ar dating document a Late Triassic generation and deformation time for the Yushu quartz diorite from the northern margin of EQ. The pluton has elongated shape, deformed fabric, with some granodiorite vein intrusive. The quartz diorites exhibit strong enrichment of large ion lithophile element and light rare earth element, depletion in high field strength element, and have enriched isotopic compositions with （87 Sr/S6 Sr）i ranging from 0. 70783 to 0. 71064 and ZNd （t） from -3. 6 to -5.9. These features suggest that they were derived from marie lower ernst; the Yushu_mylonitie pluton likely represents magmatic expression of subducting Paleo-Tethyan slab and deformed during the collision of EQ with Eurasia continent in Triassic.