- 责任者：Li Guangwei (State Key Laboratory of Continental Tectonics and Dynamics ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Xiaohan
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(11)
- 关键词：混杂堆积 ; melange ; 碎屑 ; clasts ; 白垩纪 ; Cretaceous ; 西藏 ; Tibet
- 页码：p.3328-3334
- 图表：3 illus., 1 table, 36 refs.
- 分类号：0803
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
lang=EN-US>In this paper, the authors report the in-situ detrital zircon U-Pb and Hf isotopic analysis of sedimentary rock from a sedimentary relict, paraconformably covering the Triassic ophiolite relicts in the Renbu mélange belt, Dejilin Town, Renbu County. Nine detrital zircon grains out of 54 grains have ages from 83 to 121 Ma and three grains have ages of (197±3) Ma, (203±5) Ma and (208±5) Ma. The majority of these young zircons are characterized by high 176Hf/177Hf isotopic ratios and positive εHf values that are similar to magmatic zircons from the Gangdese batholith, indicating the latter has been a predominant source provenance of the sedimentary relict. It may be a part of the foreland basin systems in the Gandese-Himalayan collisional orogen belt, which plays a significant indicator of the initial collision between India and Eurasian plates.