scholarly journals The history of the Tissint meteorite, from its crystallization on Mars to its exposure in space: New geochemical, isotopic, and cosmogenic nuclide data

2020 ◽  
Vol 55 (2) ◽  
pp. 294-311 ◽  
Author(s):  
Toni Schulz ◽  
Pavel P. Povinec ◽  
Ludovic Ferrière ◽  
A. J. Timothy Jull ◽  
Andrej Kováčik ◽  
...  
Keyword(s):  
Cosmogenic Nuclide ◽  
History Of

scholarly journals Origin, structure and exposure history of a wave-cut platform more than 1 Ma in age at the coast of northern Spain: A multiple cosmogenic nuclide approach

Geomorphology ◽  
2008 ◽  
Vol 93 (3-4) ◽  
pp. 316-334 ◽  
Author(s):  
J. Alvarez-Marrón ◽  
R. Hetzel ◽  
S. Niedermann ◽  
R. Menéndez ◽  
J. Marquínez
Keyword(s):  
Northern Spain ◽  
Cosmogenic Nuclide ◽  
History Of ◽  
Exposure History

Constraints from cosmogenic nuclides on the glaciation and erosion history of Dove Bugt, northeast Greenland

2020 ◽  
Vol 132 (11-12) ◽  
pp. 2282-2294 ◽  
Author(s):  
Daniel Søndergaard Skov ◽  
J.L. Andersen ◽  
J. Olsen ◽  
B.H. Jacobsen ◽  
M.F. Knudsen ◽  
...  
Keyword(s):  
Ice Cover ◽  
High Elevation ◽  
Cosmogenic Nuclide ◽  
Erosion History ◽  
Minimum Age ◽  
History Of ◽  
Subglacial Topography ◽  
Ice Sheet Dynamics ◽  
Cosmogenic 10Be ◽  
Exposure Ages

Abstract The intricate interplay between subglacial topography and ice-sheet dynamics is key to the evolution of large ice sheets, but in Greenland as elsewhere the effects of long-term glacial history on landscape evolution remain poorly constrained. Here we measure abundances of cosmogenic 10Be and 26Al in bedrock and transported boulders to unveil the glaciation and erosion history of Dove Bugt, northeast Greenland. In agreement with studies of west Greenland, we find that apparent exposure ages increase with elevation from 9 ka to 13 ka in low-lying valleys to 21 ka to 204 ka on high-elevation, blockfield-covered plateaus. We employ a Markov chain Monte Carlo inversion framework to constrain the probability of various erosion histories, and we quantify the residence time of samples within the upper 2 m of the bedrock subsurface—a measure defined as the cosmogenic nuclide memory. This cosmogenic nuclide memory exceeds 600 ka on the highest plateaus but is limited to less than 500 ka in most other high-elevation samples and to less than 100 ka at low-elevations. Our results define maximum limits for the fraction of ice cover during the past 1 Ma to ∼70% on the Store Koldewey peaks and ∼90% farther inland at Pusterdal, respectively. Minimum limits to ice cover, however, cannot be reliably constrained by the data. Finally, we propose that limited erosion on the highest plateaus of Store Koldewey since 0.6–1.0 Ma indicates a minimum age for fjord-plateau formation within this area of northeast Greenland.

Cosmogenic nuclide exposure ages and glacial history of late Quaternary Ross Sea drift in McMurdo Sound, Antarctica

1995 ◽  
Vol 131 (1-2) ◽  
pp. 41-56 ◽  
Author(s):  
Edward J. Brook ◽  
Mark D. Kurz ◽  
Robert P. Ackert ◽  
Grant Raisbeck ◽  
Françoise Yiou
Keyword(s):  
Ross Sea ◽  
Late Quaternary ◽  
Glacial History ◽  
Mcmurdo Sound ◽  
Cosmogenic Nuclide ◽  
History Of ◽  
Exposure Ages

Cosmogenic Nuclides

2020 ◽  
Author(s):  
Rainer Wieler
Keyword(s):  
Noble Gas ◽  
Cosmic Ray ◽  
Parent Body ◽  
Cosmogenic Nuclides ◽  
Cosmogenic Nuclide ◽  
Production Models ◽  
History Of ◽  
Noble Gas Isotopes ◽  
Exposure Ages

Cosmogenic nuclides are produced by the interaction of energetic elementary particles of galactic (or solar) cosmic radiation and their secondaries with atomic nuclei in extraterrestrial or terrestrial material. Cosmogenic nuclides usually are observable only for some noble gas isotopes, whose natural abundances in the targets of interest are exceedingly low; some radioactive isotopes with half-lives mostly in the million-year range; and a few stable nuclides of elements, such as Gd and Sm, whose abundance is sizably modified by reactions with low energy secondary cosmic ray neutrons. In solid matter, the mean attenuation length of galactic cosmic ray protons is on the order of 50 cm. Therefore, cosmogenic nuclides are a major tool in studying the history of small objects in space and of matter near the surfaces of larger parent bodies. A classical application is to measure “exposure ages” of meteorites, namely the time they spent as a small body in interplanetary space. In some cases, also the previous history of the future meteorite in its parent-body regolith can be constrained. Such information helps to understand delivery mechanisms of meteorites from their parent asteroids or parent planets and to constrain the number of ejection events responsible for the collected meteorites. Cosmogenic nuclides in lunar samples from known depths of up to ~2 m serve to study the deposition and mixing history of the lunar regolith over hundreds of millions of years, as well as to calibrate nuclide production models. Present and future sample return missions rely on cosmogenic nuclide measurements as important tools to constrain the sample’s exposure history or loss rates of their parent body surfaces to space. The first data from cosmogenic noble gas isotopes measured on the surface of Mars demonstrate that the exposure and erosional history of planetary bodies can be obtained by in-situ analyses. For the foreseeable future, exposure ages of presolar grains in meteorites are presumably the only means to quantitatively constrain their presolar history. In some cases, irradiation effects of energetic particles from the early sun can be detected in early solar system condensates, confirming that the early sun was likely much more active than today, as expected from observations of young stars. The ever-increasing precision of isotope analyses also reveals tiny isotopic anomalies induced by cosmic-ray effects in several elements of interest in cosmochemistry, which need to be recognized and corrected for. Cosmogenic nuclide studies rely on the knowledge of their production rates, which depend on the elemental composition of a sample and its “shielding” during irradiation, that is, its position within an irradiated object and for meteorites their preatmospheric size. The physics of cosmogenic nuclide production is basically well understood and has led to sophisticated production models. They are most successful if a sample’s shielding can be constrained by the analyses of several cosmogenic nuclides with different depth dependencies of their production rates. Cosmogenic nuclides are also an important tool in Earth Sciences. The foremost example is 14C produced in the atmosphere and incorporated into organic material, which is used for dating. Cosmogenic radionuclides and noble gases produced in-situ in near surface samples, mostly by secondary cosmic-ray neutrons, are an important tool in quantitative geomorphology and related fields.

Miocene to Pleistocene glacial history of West Antarctica inferred from Nunatak geomorphology and cosmogenic-nuclide measurements on bedrock surfaces

2020 ◽  
Vol 320 (8) ◽  
pp. 637-676
Author(s):  
Perry Spector ◽  
John Stone ◽  
Greg Balco ◽  
Trevor Hillebrand ◽  
Mika Thompson ◽  
...  
Keyword(s):  
Glacial History ◽  
West Antarctica ◽  
Cosmogenic Nuclide ◽  
History Of

Reconstructing the erosion history of glaciated passive margins: applications of in situ produced cosmogenic nuclide techniques

2002 ◽  
Vol 196 (1) ◽  
pp. 153-168 ◽  
Author(s):  
Arjen P. Stroeven ◽  
Derek Fabel ◽  
Jon Harbor ◽  
Clas Hättestrand ◽  
Johan Kleman
Keyword(s):  
Passive Margins ◽  
Cosmogenic Nuclide ◽  
Erosion History ◽  
History Of

Reconstruction of the history of the Palliser Rockslide based on 36Cl terrestrial cosmogenic nuclide dating and debris volume estimations

Landslides ◽  
2014 ◽  
Vol 12 (6) ◽  
pp. 1097-1106 ◽  
Author(s):  
Matthieu Sturzenegger ◽  
Doug Stead ◽  
John Gosse ◽  
Brent Ward ◽  
Corey Froese
Keyword(s):  
Cosmogenic Nuclide ◽  
History Of ◽  
Cosmogenic Nuclide Dating
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