气候变化领域集成服务门户(CCPortal): Distinguishing Tectonic Versus Climatic Forcing on Landscape Evolution: An Example from SE Tibetan Plateau

CCPortal

DOI	10.1130/B35649.1
	Distinguishing Tectonic Versus Climatic Forcing on Landscape Evolution: An Example from SE Tibetan Plateau
	Fangbin L.; Danišík M.; Zheng D.; Gallagher K.; Junsheng N.
发表日期	2020
ISSN	167606
起始页码	233
结束页码	242
卷号	133 期号:1
英文摘要	Distinguishing climate from tectonic forcing in shaping the Earth's surface has been a long-standing issue in the Earth sciences. Great debate exists regarding when and how the SE Tibetan Plateau achieved its current low-relief topography, and both lateral extrusion and lower crust flow have been proposed as the dominant mechanism. Reconstruction of the exhumation history of the SE Tibetan Plateau is key to understanding these formation processes and resolving the significance of different forcing mechanisms. Here we report zircon and apatite (U-Th)/He ages from steep transects across the Lincang granite belt of the SE Tibetan Plateau. Our results reveal a two-stage exhumation history during the Cenozoic with rapid cooling phases in the late Eocene and the middle Miocene. In the late Eocene, the climate was generally dry and there is plenty of evidence for increased extrusion and upper crustal shortening. We suggest tectonic processes are responsible for the first inferred cooling. In contrast, the Asian summer monsoon precipitation increased during the middle Miocene, and we posit the middle Miocene cooling phase records a phase of rapid river incision trig-gered by the intensified precipitation and associated fault movements. The results are consistent with recent paleo-altimetry work in this region suggesting that the present-day topography of the SE Tibetan Plateau had been largely constructed by the late Eocene. Together, these data suggest that extrusion and/or upper crustal shortening setup the first order topography of the SE Tibetan Plateau, which was then modified by climate- triggered fluvial incision and feedbacks initiated in the middle Miocene. © 2020 Geological Society of America
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184770
作者单位	Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China; John de Laeter Centre, The Institute for Geoscience Research, Curtin University, Perth, estern Australia 6102, Australia; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Géosciences Rennes, Université de Rennes 1, Rennes, 35700, France
推荐引用方式 GB/T 7714	Fangbin L.,Danišík M.,Zheng D.,et al. Distinguishing Tectonic Versus Climatic Forcing on Landscape Evolution: An Example from SE Tibetan Plateau[J],2020,133(1).
APA	Fangbin L.,Danišík M.,Zheng D.,Gallagher K.,&Junsheng N..(2020).Distinguishing Tectonic Versus Climatic Forcing on Landscape Evolution: An Example from SE Tibetan Plateau.Bulletin of the Geological Society of America,133(1).
MLA	Fangbin L.,et al."Distinguishing Tectonic Versus Climatic Forcing on Landscape Evolution: An Example from SE Tibetan Plateau".Bulletin of the Geological Society of America 133.1(2020).