globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.07.019
Scopus记录号: 2-s2.0-85050532529
论文题名:
Downstream evolution of the thermochronologic age signal in the Brahmaputra catchment (eastern Himalaya): Implications for the detrital record of erosion
作者: Gemignani L.; van der Beek P.A.; Braun J.; Najman Y.; Bernet M.; Garzanti E.; Wijbrans J.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 499
起始页码: 48
结束页码: 61
语种: 英语
英文关键词: detrital thermochronology ; Eastern Himalaya ; mixing model ; Namche Barwa syntaxis ; present day erosion rate values
Scopus关键词: Erosion ; Fission reactions ; Mica ; Mixing ; Rivers ; Runoff ; Sediments ; Silicate minerals ; Zircon ; Detrital thermochronology ; Erosion rates ; Himalayas ; Mixing models ; Namche Barwa syntaxis ; Catchments ; age structure ; argon-argon dating ; cooling ; detrital deposit ; erosion rate ; exhumation ; fission track dating ; Tertiary ; thermochronology ; zircon ; Brahmaputra River ; China ; Himalayas ; Namjagbarwa Feng ; Xizang
英文摘要: The Namche Barwa massif in the eastern Himalayan syntaxis is characterized by very rapid exhumation and provides a significant proportion of the sediment flux carried by the Brahmaputra River. We present new detrital zircon fission-track (ZFT) and muscovite 40Ar/39Ar (MAr) data from modern sediments of rivers draining the eastern Himalaya. The cooling-age populations for both thermochronometers contain a characteristic <2 Ma signature related to the rapid exhumation of Namche Barwa, which can be traced hundreds of kilometers downstream from their source into the Brahmaputra foreland, despite dilution from downstream tributary catchments. To estimate present-day erosion in the catchments, we apply a mixing model based on linear inversion of the binned age distributions. The inversion predicts relative erosion rates in the syntaxial region that are an order of magnitude higher than those in upstream catchments, and about twice as high as those in the southern Himalayan catchments, consistent to first order with previous estimates of erosion-rate patterns in the eastern Himalaya. A comparison of the observed downstream evolution of age distributions with a sediment-flux model suggests that the ZFT signal can be explained by dilution from Himalayan tributaries only, whereas the MAr signal is also affected by selective sequestering (possibly through winnowing) of micas as they are transported downstream. Nevertheless, thermochronological ages <2 Ma provide a diagnostic signal of syntaxial exhumation in the sedimentary record of the eastern Himalaya; this study suggests the most robust signal to be recorded in the most proximal deposits with respect to the syntaxis. © 2018 The Authors
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109711
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

Files in This Item:

There are no files associated with this item.


作者单位: Faculty of Earth and Life Science, Vrije Universiteit, Amsterdam, Netherlands; Dipartimento di Scienze della Terra, Universitá degli Studi di Torino, Torino, Italy; Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes, CNRS, Grenoble, France; Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom; Dipartimento di Scienze dell’ Ambiente e della Terra, Universitá degli Studi di Milano-Bicocca, Milano, Italy; Helmholtz Center Potsdam, German Research Center for Geoscience (GFZ), Potsdam, Germany

Recommended Citation:
Gemignani L.,van der Beek P.A.,Braun J.,et al. Downstream evolution of the thermochronologic age signal in the Brahmaputra catchment (eastern Himalaya): Implications for the detrital record of erosion[J]. Earth and Planetary Science Letters,2018-01-01,499
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Gemignani L.]'s Articles
[van der Beek P.A.]'s Articles
[Braun J.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Gemignani L.]'s Articles
[van der Beek P.A.]'s Articles
[Braun J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Gemignani L.]‘s Articles
[van der Beek P.A.]‘s Articles
[Braun J.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.