Arid
DOI10.1029/2010GC003084
A geologically constrained Monte Carlo approach to modeling exposure ages from profiles of cosmogenic nuclides: An example from Lees Ferry, Arizona
Hidy, Alan J.1; Gosse, John C.1; Pederson, Joel L.2; Mattern, Jann Paul3; Finkel, Robert C.4,5
通讯作者Hidy, Alan J.
来源期刊GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
ISSN1525-2027
出版年2010
卷号11
英文摘要

We present a user-friendly and versatile Monte Carlo simulator for modeling profiles of in situ terrestrial cosmogenic nuclides (TCNs). Our program (available online at http://geochronology.earthsciences.dal.ca/downloads-models.html) permits the incorporation of site-specific geologic knowledge to calculate most probable values for exposure age, erosion rate, and inherited nuclide concentration while providing a rigorous treatment of their uncertainties. The simulator is demonstrated with Be-10 data from a fluvial terrace at Lees Ferry, Arizona. Interpreted constraints on erosion, based on local soil properties and terrace morphology, yield a most probable exposure age and inheritance of 83.9(-14.1)(+19.1) ka, and 9.49(-2.52)(+1.21) x 10(4) atoms g(-1), respectively (2 sigma). Without the ability to apply some constraint to either erosion rate or age, shallow depth profiles of any cosmogenic nuclide (except for nuclides produced via thermal and epithermal neutron capture, e. g., Cl-36) cannot be optimized to resolve either parameter. Contrasting simulations of Be-10 data from both sand-and pebble-sized clasts within the same deposit indicate grain size can significantly affect the ability to model ages with TCN depth profiles and, when possible, sand-not pebbles-should be used for depth profile exposure dating.


英文关键词Be-10 desert pavement TCN Grand Canyon alluvial fan active tectonics
类型Article
语种英语
国家Canada ; USA ; France
收录类别SCI-E
WOS记录号WOS:000281572200001
WOS关键词PRODUCTION-RATES ; EROSION RATES ; BE-10 ; TERRACES ; AL-26 ; RIVER ; TIME ; RADIONUCLIDES ; INHERITANCE ; INCISION
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构University of California, Berkeley
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/164262
作者单位1.Dalhousie Univ, Dept Earth Sci, Halifax, NS B3H 4R2, Canada;
2.Utah State Univ, Dept Geol, Logan, UT 84322 USA;
3.Dalhousie Univ, Dept Math & Stat, Halifax, NS B3H 3J5, Canada;
4.Univ Calif Berkeley, Earth & Planetary Sci Dept, Berkeley, CA 94720 USA;
5.CEREGE, Europole Mediterran Arbois, F-13545 Aix En Provence 4, France
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GB/T 7714
Hidy, Alan J.,Gosse, John C.,Pederson, Joel L.,et al. A geologically constrained Monte Carlo approach to modeling exposure ages from profiles of cosmogenic nuclides: An example from Lees Ferry, Arizona[J]. University of California, Berkeley,2010,11.
APA Hidy, Alan J.,Gosse, John C.,Pederson, Joel L.,Mattern, Jann Paul,&Finkel, Robert C..(2010).A geologically constrained Monte Carlo approach to modeling exposure ages from profiles of cosmogenic nuclides: An example from Lees Ferry, Arizona.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,11.
MLA Hidy, Alan J.,et al."A geologically constrained Monte Carlo approach to modeling exposure ages from profiles of cosmogenic nuclides: An example from Lees Ferry, Arizona".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 11(2010).
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