DOI: 10.1002/2015GL065959
论文题名: Slow Cenozoic uplift of the western Andean Cordillera indicated by cosmogenic 3He in alluvial boulders from the Pacific Planation Surface
作者: Evenstar L.A. ; Stuart F.M. ; Hartley A.J. ; Tattitch B.
刊名: Geophysical Research Letters
ISSN: 0094-9443
EISSN: 1944-9174
出版年: 2015
卷: 42, 期: 20 起始页码: 8448
结束页码: 8455
语种: 英语
英文关键词: Andean uplift
; Chile
; cosmogenic Isotopes
; Longitudinal Valley
; paleoelevation
Scopus关键词: Altitude control
; Andean uplift
; Chile
; Cosmogenic isotopes
; Longitudinal Valley
; Paleoelevation
; Isotopes
; altitude
; boulder
; concentration (composition)
; cordillera
; cosmogenic radionuclide
; delamination
; deposition
; elevation
; helium isotope
; longitudinal gradient
; Miocene
; planation
; uplift
; Andes
; Chile
; Pacific Ocean
英文摘要: To determine the mechanisms responsible for mountain belt growth, it is important to accurately establish the timing of surface uplift. Here we exploit the altitude control on the production rate of in situ cosmogenic nuclides to test the hypothesis that the Andes was uplifted in the late Miocene. High concentrations of in situ cosmogenic 3He (3Hecos) have previously been measured in alluvial boulders on the western flank of the Central Andes, northern Chile (Evenstar et al. 2009). These are consistent with deposition soon after formation of the surface (13-14 Ma). We have modeled the accumulation of cosmogenic 3He in several different surface uplift scenarios and compared them to the measured concentrations. The measured 3Hecos concentrations are too high to be produced by late Miocene uplift and imply that the western flank of the Andean Cordillera attained a substantial part of its current elevation prior to 14 Myr ago. Key Points Production rates of in situ cosmogenic isotopes are used for paleoelevation Uplift of the Andes by mantle delamination in the late Miocene is ruled out The Precordillera attained a substantial part of its elevation by 14 Ma © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946594091&doi=10.1002%2f2015GL065959&partnerID=40&md5=fd1f8201236e390d91839b612e912c5e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9058
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Earth Science, University of Bristol, Bristol, United Kingdom
Recommended Citation:
Evenstar L.A.,Stuart F.M.,Hartley A.J.,et al. Slow Cenozoic uplift of the western Andean Cordillera indicated by cosmogenic 3He in alluvial boulders from the Pacific Planation Surface[J]. Geophysical Research Letters,2015-01-01,42(20).