منابع مشابه
Deciphering boulder mobility and erosion from cosmogenic nuclide exposure dating
[1] Large boulders are prominent features in many geomorphic systems and are frequently targeted for cosmogenic exposure dating. Presently, there are little data or theory predicting exposure age, erosion rate, and mobilization frequency of boulders in environments such as channels, talus slopes, or moraines. Here we explore the potential for cosmogenic isotope analysis to constrain the transpo...
متن کاملQuantifying glacial moraine age, denudation, and soil mixing with cosmogenic nuclide depth profiles
[1] Glacial boulders and soils on moraines are often dated to quantify the timing of glaciations and/or rates of chemical weathering in moraine chronosequences. A common assumption is that moraine crest erosion and soil mixing are unimportant. However, several studies suggest moraine denudation may be substantial. We evaluate the magnitude of moraine denudation and soil mixing in the Pinedale (...
متن کاملMeasurement of long-term denudation rates in carbonate landscapes using in situ-produced 36Cl cosmogenic nuclide
ecent progresses have been made in the quantification of denudation of eroding landscapes and its links with topography. Despite these advances, data is still sparse in carbonate terrain, which covers a significant part of the Earth’s surface. We can now measure in situ-produced cosmogenic nuclides concentrations in various near-surface materials, allowing accurate quantification of the rates o...
متن کاملDeglacial history of the Pensacola Mountains, Antarctica from glacial geomorphology and cosmogenic nuclide surface exposure dating
The retreat history of the Antarctic Ice Sheet is important for understanding rapid deglaciation, as well as to constrain numerical ice sheet models and ice loading models required for glacial isostatic adjustment modelling. There is particular debate about the extent of grounded ice in the Weddell Sea embayment at the Last Glacial Maximum, and its subsequent deglacial history. Here we provide ...
متن کاملAn Isochron Method for Cosmogenic-nuclide Dating of Buried Soils and Sediments
We describe an improved method for dating buried paleosols using measurements of the cosmic-ray-produced radionuclides Be and Al in quartz grains, and apply it to a sequence of intercalated tills and paleosols in central Missouri, USA, that record Plio-Pleistocene advances of the Laurentide Ice Sheet. A buried paleosol implies a period of surface exposure and nuclide accumulation, followed by b...
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2019
ISSN: 0012-821X
DOI: 10.1016/j.epsl.2019.03.005