Beryllium-10 terrestrial cosmogenic nuclide surface exposure dating of Quaternary landforms in Death Valley

Geomorphology ◽  
2011 ◽  
Vol 125 (4) ◽  
pp. 541-557 ◽  
Author(s):  
Lewis A. Owen ◽  
Kurt L. Frankel ◽  
Jeffrey R. Knott ◽  
Scott Reynhout ◽  
Robert C. Finkel ◽  
...  
Keyword(s):  
Death Valley ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic Nuclide

scholarly journals Surface exposure dating with cosmogenic nuclides

2008 ◽  
Vol 57 (1/2) ◽  
pp. 179-209 ◽  
Author(s):  
Susan Ivy-Ochs ◽  
Florian Kober
Keyword(s):  
Cosmic Rays ◽  
Field Studies ◽  
Cosmogenic Nuclides ◽  
Sampling Strategies ◽  
Surface Exposure Dating ◽  
Weathering Rates ◽  
Exposure Dating ◽  
Cosmogenic Nuclide ◽  
Exposure Ages ◽  
Age Constraints

Abstract. In the last decades surface exposure dating using cosmogenic nuclides has emerged as a powerful tool in Quaternary geochronology and landscape evolution studies. Cosmogenic nuclides are produced in rocks and sediment due to reactions induced by cosmic rays. Landforms ranging in age from a few hundred years to tens of millions of years can be dated (depending on rock or landform weathering rates) by measuring nuclide concentrations. In this paper the history and theory of surface exposure dating are reviewed followed by an extensive outline of the fields of application of the method. Sampling strategies as well as information on individual nuclides are discussed in detail. The power of cosmogenic nuclide methods lies in the number of nuclides available (the radionuclides 10Be, 14C, 26Al, and 36Cl and the stable noble gases 3He and 21Ne), which allows almost every mineral and hence almost every lithology to be analyzed. As a result focus can shift to the geomorphic questions. It is important that obtained exposure ages are carefully scrutinized in the framework of detailed field studies, including local terrace or moraine stratigraphy and regional morphostratigraphic relationships; as well as in light of independent age constraints.

First attempt to combine terrestrial cosmogenic nuclide (10Be) and Schmidt hammer relative-age dating: Strauchon Glacier, Southern Alps, New Zealand

2009 ◽  
Vol 1 (3) ◽  
Author(s):  
Stefan Winkler
Keyword(s):  
New Zealand ◽  
Southern Alps ◽  
Age Dating ◽  
Schmidt Hammer ◽  
Relative Age ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic Nuclide ◽  
Calibration Curves ◽  
Cosmogenic 10Be

AbstractThis study provides the first attempt to combine terrestrial (in situ) cosmogenic nuclide (10Be) surface exposure dating with Schmidt hammer relative-age dating for the age estimation of Holocene moraines at Strauchon Glacier, Southern Alps, New Zealand. Numerous Schmidt hammer tests enable a multi-ridged lateral moraine system to be related to three late-Holocene ‘Little Ice Age’-type events. On the basis of cosmogenic 10Be ages, those events are dated to c. 2400, 1700, and 1100 years ago. Linear age-calibration curves are constructed in order to relate Schmidt hammer R-values to cosmogenic 10Be ages. The high explanation yielded reveals the causal link between both data sets. The potential of combining both methods in a ‘’multiproxy approach’ is discussed alongside possible future improvements. Terrestrial cosmogenic nuclide dating delivers absolute ages needed as fixed points for Schmidt hammer age-calibration curves. The Schmidt hammer technique can be used to crosscheck the boulder surfaces chosen for surface exposure dating by terrestrial cosmogenic nuclides. It should, therefore, reduce the number of samples necessary and costs.

scholarly journals Application of in-situ produced terrestrial cosmogenic nuclides to archaeology: A schematic review

2008 ◽  
Vol 57 (1/2) ◽  
pp. 226-238
Author(s):  
Naki Akcar ◽  
Susan Ivy-Ochs ◽  
Christian Schlüchter
Keyword(s):  
Cosmogenic Nuclides ◽  
Close Collaboration ◽  
Total Exposure ◽  
Surface Exposure Dating ◽  
Wide Applicability ◽  
Exposure Dating ◽  
The Past ◽  
Cosmogenic Nuclide ◽  
Time Period

Abstract. The wide applicability of in-situ produced Terrestrial Cosmogenic Nuclides (TCNs) to geological problems and experiences in development and testing gained over the past decade is encouraging for its application to archaeological questions, where there is a distinct need for an additional independent dating tool beyond the limits of radiocarbon (~ 40 ka). Just as TCNs are applicable to a broader time period with considerable precision in archaeology, so also are they applicable to all lithologies. Application of TCNs to archaeological problems is relatively simple: either surface exposure dating (using cosmogenic nuclide production) or burial dating (using decay of radioactive cosmogenic nuclides) can be applied. For a successful application, close collaboration between archaeologists and TCN experts is required. The total exposure from 100 a to 5 Ma of a given surface of archaeological origin can be determined by surface exposure dating. The range of burial dating is from ~0.1 to 5 Ma. TCNs have been successfully applied to many archaeological problems during the last decade and both surface exposure dating and burial dating show high potential in the solving of archaeological problems.

The CoNTESTA Project: Impacts of geomagnetic field changes on cosmogenic nuclide production-rate variability and implications for surface-exposure dating

2020 ◽  
Author(s):  
Margaret Jackson ◽  
Gordon Bromley ◽  
Pierre-Henri Blard ◽  
Sidney Hemming
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Production Rate ◽  
Magnetic Field Strength ◽  
Cosmic Ray ◽  
Glacial Deposits ◽  
Past Climate ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic Nuclide

<p>Determining the geographic footprint of past climate events is a fundamental step in identifying the mechanisms that drive and propagate these changes around the globe. Glacial deposits are a particularly robust source of such data; glaciers are sensitive indicators of climate that leave records of their past fluctuations on the landscape. Given precise chronologic control, glacial deposits can be used to reconstruct past climate variability. Recent advances in cosmogenic nuclide surface-exposure dating have established past glacial fluctuations as a key climate proxy. However, uncertainties in the application of cosmogenic nuclide production-rate-scaling frameworks hinder efforts to compare past glacial fluctuations with other records of past climate conditions. Production-rate scaling is particularly uncertain in the tropics, where the theorized impacts of changing magnetic field strength on the incoming cosmic ray flux are greatest. Here we present results in-progress from the CoNTESTA [Cosmogenic Nuclide Temporal and Elevation Scaling: Testing and Application] Project, which seeks to establish multiple nuclide production-rate calibration sites of varying age from the low latitudes in order to assess directly the impacts of changing magnetic field strength on nuclide production over time. We also report new data that address empirically the impacts of elevation on nuclide production. The results of this project will strengthen our understanding of cosmogenic nuclide production globally and will improve surface-exposure age calculations from all regions. This in turn will enable more robust assessment of the global phasing of glacial fluctuations and will forward our understanding of landscape dynamics and Earth surface history. </p>

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