# name
Timing and nature of alluvial fan and strath terrace formation in the Eastern Precordillera of Argentina

# metadata.dc.description.abstract[].value
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 w225 ka. The Marquesado complex Q3m surface dates to w17  3 ka, whereas the Loma Negra Q1ln, Q2ln, Q3ln, Q4ln, and Q5ln surfaces date to w24  3 ka, w48  2 ka, w65  13 ka, w105  21 ka, and w181  29 ka, respectively. The Carpintería complex comprises eight surfaces that have been dated and include the Q1c (w23  3 ka), Q2c (w5  5 ka), Q3ac (w25  12 ka), Q3bc (w29  15 ka), Q4c (w61  12 ka), Q5c (w98  18 ka), Q6c (w93  18 ka), and Q7c (w212  37 ka). 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 (w10  104 10Be atoms/g of SiO2 and w5 m Ma 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.

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Quaternary Science Reviews, 2013, vol. 80, p. 143-168

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Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

# metadata.dc.title[].value
Timing and nature of alluvial fan and strath terrace formation in the Eastern Precordillera of Argentina