Low Closure Temperature Thermochronometry Study on the Late Cenozoic Tectonic Active of
详细信息
- 责任者：Wan Jinglin (Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Zheng Wenjun
- 刊名：Geochimica
- 出版年：2010
- 卷期：39(5)
- 关键词：隆起 ; uplifts ; 热年代学 ; thermochronology ; 裂变径迹计时 ; fission-track dating ; 祁连山 ; Qilian Mountains
- 页码：p.439-446
- 图表：3 illus., 2 tables, 44 refs.
- 分类号：0300
- issnNo：ISSN0379-1726
- isbnNo：CN44-1398/P
摘要
The onset time of Qilianshan uplift in the Late Cenozoic is an important parameter to constrain the Tibetan Plateau continental dynamics and the climate feedback on the mountain uplift. The apatite fission track and (U-Th)/He dating for samples from northern Qilianshan suggest that the onset time of northern Qilianshan uplift is about 9.5 Ma, with a vertical thrust rate of (0.5 ± 0.1) mm /a and a shortening rate of about (1.4 ± 0.2) mm /a since the Late Cenozoic. The onset time of northern Qilianshan uplift presented in this paper is broadly consistent with the time predicted by “convective removal of lithospheric mantle” and “channel flow” models, and the time when the Chinese continent northwestern monsoon enhanced. Therefore, the onset time of Qilianshan uplift support the argument that the Tibetan Plateau outgrowth during about 5-12 Ma. It does not support that southern Qilianshan uplift at 11 Ma and the northern Qilianshan uplift later than 5 Ma prodicted by the “oblique intra-continental subduction” model.