Glacial erosion and sediment dispersion from detrital cosmogenic nuclide analyses of till

Staiger, J. W.; Gosse, John C.; Little, E C; Utting, D J; Finkel, Robert C.; Johnson, Jesse V.; Fastook, J. L.

doi:10.1016/j.quageo.2006.06.009

Cited by 36 publications

(40 citation statements)

References 47 publications

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“…These cases of glacial erosion of older sediments imply that any inventory measured is related not only to the age of a profi le, but also to the long residence time of 10 Be within it. In some ways, this application is similar to the case of in situ-produced 10 Be being retained in glacial sediments (Staiger et al, 2006) and to the case of extreme sediment storage in desert environments (Vermeesch et al, 2011).…”

Section: Glacial Depositsmentioning

confidence: 98%

A cosmic trip: 25 years of cosmogenic nuclides in geology

Granger

Lifton

Willenbring

2013

Geological Society of America Bulletin

155

103

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Terrestrial cosmogenic nuclides, produced by secondary cosmic-ray interactions in the atmosphere and in situ within minerals in the shallow lithosphere, are widely used to date surface exposure of rocks and sediments, to estimate erosion and weathering rates, and to date sediment deposition or burial. Their use has transformed geomorphology and Quaternary geology, for the fi rst time allowing landforms to be dated and denudation rates to be measured over soil-forming time scales. The application of cosmogenic nuclides to geology began soon after the invention of accelerator mass spectrometry (AMS) in 1977 and increased dramatically with the measurement of in situ-produced nuclides in mineral grains near Earth's surface in the 1980s. The past 25 yr have witnessed the development of cosmogenic nuclides from their initial detection to their prevalence today as a standard geochronological and geochemical tool. This review covers the major developments of the past 25 yr by comparing the state of the fi eld in 1988 with that of today, and by identifying key advances in that period that moved the fi eld forward. We emphasize the most commonly used in situ-produced nuclides measured by AMS for geological applications, but we also discuss other nuclides where their applications overlap. Our review covers AMS instrumentation, cosmogenic nuclide production rates, the methods of surface exposure dating, measurement of erosion and weathering, and burial dating, and meteoric 10 Be.-In memoriam: Devendra Lal (1929Lal ( -2012, whose vision inspired the fi eld. 10 Be-Beryllium-10 produced in the atmosphere is ubiquitous on Earth's surface and is typically present at concentrations far greater than the in situ-produced variety. Its concentration in soils, sediment, and ice depends on many factors, including production rates, atmospheric circulation, and precipitation, as well as weathering and erosion. Gas Ionization Detector R30 Detector R45Gas filled Magnet ExB velocity selectors Figure 1. A schematic of the PRIME Laboratory accelerator mass spectrometer (AMS). Every AMS consists of at least fi ve basic parts: (1) a negative ion source, followed by (2) a mass-selective element such as a magnetic sector, (3) an accelerator with an electron stripper, (4) a second mass-selective element, and fi nally (5) a particle detector. Additional elements such as velocity selectors, electrostatic elements, and gas-fi lled magnets may be employed at individual laboratories to enhance the selectivity of the AMS, but the overall architecture remains similar. PRIME Laboratory employs two discrete detector beam lines. For scale, the accelerator tank is ~13 m long.on August 24, 2013 gsabulletin.gsapubs.org Downloaded from

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Section: Glacial Depositsmentioning

confidence: 98%

A cosmic trip: 25 years of cosmogenic nuclides in geology

Granger

Lifton

Willenbring

2013

Geological Society of America Bulletin

155

103

View full text Add to dashboard Cite

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“…These studies provide local erosion estimates, indicating that cosmogenic nuclides CNs can be preserved in subglacial bedrock over a full glacial cycle. However, larger‐scale average glacier and ice sheet erosion rates remain less constrained (Hallet et al , 1996; Davis et al , 1999; Staiger et al , 2006).…”

Section: Introductionmentioning

confidence: 99%

Dating of raised marine and lacustrine deposits in east Greenland using beryllium‐10 depth profiles and implications for estimates of subglacial erosion

Goehring

Kelly

Schaefer

et al. 2010

J Quaternary Science

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T. V. 2010. Dating of raised marine and lacustrine deposits in east Greenland using beryllium-10 depth profiles and implications for estimates of subglacial erosion.ABSTRACT: Here we combine 10 Be depth profile techniques applied to late glacial ice-contact marine and lacustrine deltas, as well as boulder exposure dating of associated features in the Scoresby Sound region, east Greenland, to determine both the surface age and the magnitude of cosmogenic nuclide inheritance. Boulder ages from an ice-contact delta in northern Scoresby Sund show scatter typical of polar regions and yield an average age of 12.8 AE 0.5 ka -about 2 ka older than both our average profile surface age of 10.9 AE 0.7 ka from three depth profiles and a radiocarbon-based estimate. On the other hand, boulder exposure ages from a set of moraines in southern Scoresby Sund show excellent internal consistency for polar regions and yield an average age of 11.6 AE 0.2 ka. The profile surface age from a corresponding ice-contact delta is 8.1 AE 0.9 ka, while a second delta yields an age of 10.0 AE 0.4 ka. Measured 10 Be inheritance concentrations from all depth profiles are internally consistent and are between 10% and 20% of the surface concentrations, suggesting a regional cosmogenic inheritance signal for the Scoresby Sound landscape. Based on the profile inheritance concentrations, we explore the first-order catchment-averaged bedrock erosion under the Greenland ice sheet, yielding estimates of total erosion during the last glacial cycle of the order of 2-30 m.

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“…Avariety of applications of cosmogenic radionuclides have constrained ice sheet erosion along ice sheet interiors Stroeven et al, 2002;Li et al, 2005;Harbor et al, 2006;Staiger et al, 2006) and fjords (Briner et al, 2003;Marquette et al, 2004;Staiger et al, 2005). On Baffin Island, regions between the ice sheet interior and periphery have yet to be explored with cosmogenic radionuclides, but are important for understanding how inland ice flow becomes organized to exploit the efficient conduits at fjorded margins.…”

Section: Introductionmentioning

confidence: 99%