DOI: 10.1016/j.quascirev.2013.05.004
Scopus记录号: 2-s2.0-84884914974
论文题名: Timing and nature of alluvial fan and strath terrace formation in the Eastern Precordillera of Argentina
作者: Hedrick K. ; Owen L.A. ; Rockwell T.K. ; Meigs A. ; Costa C. ; Caffee M.W. ; Masana E. ; Ahumada E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 80 起始页码: 143
结束页码: 168
语种: 英语
英文关键词: Climate change
; Erosion rates
; Optically stimulated luminescence dating
; Tectonics
; Terrestrial cosmogenic nuclide dating
Scopus关键词: Erosion rates
; Forcing agents
; Global climates
; Optically stimulated luminescence
; Refining surfaces
; Surface exposure age
; Terrace formations
; Terrestrial cosmogenic nuclides
; Climate change
; Erosion
; Isotopes
; Tectonics
; Landforms
; alluvial fan
; climate effect
; climate forcing
; dominance
; formation mechanism
; global climate
; land type
; Quaternary
; tectonic evolution
; terrace
; Argentina
; Precordillera
英文摘要: Sixty-eight 10Be terrestrial cosmogenic nuclide (TCN) surface exposure ages are presented to define the timing of alluvial fan and strath terrace formation in the hyper-arid San Juan region of the Argentine Precordillera. This region is tectonically active, and numerous fault scarps traverse Quaternary landforms. The three study sites, Marquesado strath complex, Loma Negra alluvial fan and Carpintería strath complex reveal a history of alluvial fan and strath terrace development over the past ~225ka. The Marquesado complex Q3m surface dates to ~17±3ka, whereas the Loma Negra Q1ln, Q2ln, Q3ln, Q4ln, and Q5ln surfaces date to ~24±3ka, ~48±2ka, ~65±13ka, ~105±21ka, and ~181±29ka, respectively. The Carpintería complex comprises eight surfaces that have been dated and include the Q1c (~23±3ka), Q2c (~5±5ka), Q3ac (~25±12ka), Q3bc (~29±15ka), Q4c (~61±12ka), Q5c (~98±18ka), Q6c (~93±18ka), and Q7c (~212±37ka). 10Be TCN depth profile data for the Loma Negra alluvial fan complex and Carpintería strath terrace complex, as well as OSL ages on some Carpintería deposits, aid in refining surface ages for comparison with local and global climate proxies, and additionally offer insights into inheritance and erosion rate values for TCNs (~10×10410Be atoms/g of SiO2 and ~5mMa-1, respectively). Comparison with other alluvial fan studies in the region show that less dynamic and older preserved surfaces occur in the Carpintería and Loma Negra areas with only younger alluvial fan surfaces preserved both to the north and south. These data in combination with that of other studies illustrate broad regional agreement between alluvial fan and strath terrace ages, which suggests that climate is the dominant forcing agent in the timing of terrace formation in this region. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60678
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States; Department of Geological Sciences, San Diego State University, San Diego, CA 92182, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, United States; Department of Geology, Universidad Nacional de San Luis, 5700 San Luis, Argentina; Department of Physics, Purdue University, West Lafayette, IN 47907, United States; Department Geodinamica ia Geofisica, Universitat de Barcelona, Spain
Recommended Citation:
Hedrick K.,Owen L.A.,Rockwell T.K.,et al. Timing and nature of alluvial fan and strath terrace formation in the Eastern Precordillera of Argentina[J]. Quaternary Science Reviews,2013-01-01,80