DOI: 10.1016/j.epsl.2020.116112
论文题名: Late Cenozoic topographic evolution of the Eastern Cordillera and Puna Plateau margin in the southern Central Andes (NW Argentina)
作者: Pingel H. ; Strecker M.R. ; Mulch A. ; Alonso R.N. ; Cottle J. ; Rohrmann A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 535 语种: 英语
中文关键词: Eastern Cordillera
; NW Argentina
; orographic barrier formation
; Puna Plateau
; surface uplift
; tectonics
英文关键词: Binary alloys
; Geochronology
; Hydrogen
; Isotopes
; Lead alloys
; Silicate minerals
; Tectonics
; Uranium alloys
; Zircon
; Argentina
; Eastern Cordillera
; Hydrogen isotopic composition
; Orographic barriers
; Puna Plateau
; Spatio-temporal variation
; Spatiotemporal information
; Zircon U-Pb geochronologies
; Rain
; Cenozoic
; continental margin
; isotopic analysis
; orographic effect
; spatiotemporal analysis
; surface
; tectonic evolution
; topographic effect
; uplift
; uranium-lead dating
; zircon
; Andes
; Cordillera Oriental [Andes]
; Puna
英文摘要: The Andes constitute an important orographic barrier in the southern hemisphere, impacting atmospheric circulation, the amount and distribution of rainfall, and Earth-surface processes in a highly asymmetric manner. In the Central Andes of NW Argentina, the Andean Plateau (Puna) and the intermontane basins of the adjacent Eastern Cordillera constitute geological archives that furnish spatiotemporal information on surface uplift and associated paleo-environmental change. Today, rainfall in NW Argentina is focused along the windward flanks of the Eastern Cordillera, while its intermontane basins and the Puna constitute high-elevation regions with strongly reduced rainfall. The present-day influence of these topographic characteristics on precipitation patterns is reflected by systematic changes in the hydrogen stable isotope ratios of meteoric water. Proxy archives from basin strata record past environmental conditions and provide insight into the nature of topographic growth through time. We present 34 new hydrogen isotopic compositions of volcanic glass (δDg), extracted from tuffs interbedded with the sedimentary deposits of three different regions across the eastern Andean margin between ca. 24°S and 25°S latitude. Combined with new zircon U-Pb geochronology, our data show clear spatiotemporal variations in δDg correlating with topographic growth and ensuing orographic effects during the Miocene and Pleistocene. In particular, variations in δDg indicate that the Pastos Grandes (Puna) and the Toro (Eastern Cordillera) basins had attained modern elevations by ca. 8 and 6 Ma, respectively. A strong positive shift in the δDg record of the Toro Basin after 840 ka coincides with deposition of thick fluvial/alluvial conglomerates suggesting orographically induced aridification due to progressive range uplift to the east. Other δDg records from the Eastern Cordillera show similar, but diachronous events emphasizing the importance of regional tectonics for environmental change with implications for the formation of orogenic plateaus. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165213
Appears in Collections: 气候变化与战略
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作者单位: Institut für Geowissenschaften, Universität Potsdam, Potsdam, 14476, Germany; Senckenberg Biodiversität und Klima Forschungszentrum (SBiK-F), Frankfurt/Main, 60325, Germany; Institut für Geowissenschaften, Goethe Universität Frankfurt, Frankfurt/Main, 60438, Germany; Departamento de Geología, Universidad Nacional de Salta, Salta, 4400, Argentina; Department of Earth Science, Earth Research Institute, University of California, Santa Barbara, CA 93106, United States
Recommended Citation:
Pingel H.,Strecker M.R.,Mulch A.,et al. Late Cenozoic topographic evolution of the Eastern Cordillera and Puna Plateau margin in the southern Central Andes (NW Argentina)[J]. Earth and Planetary Science Letters,2020-01-01,535