Noble gas exposure ages of samples from Cone and North Ray craters: Implications for the recent lunar cratering chronology

2021 ◽  
Author(s):  
Evelyn Füri ◽  
Laurent Zimmermann ◽  
Harald Hiesinger ◽  
Katherine Joy
Keyword(s):  
Noble Gas ◽  
Exposure Ages ◽  
Gas Exposure

scholarly journals Noble Gas Record of Japanese Chondrites

1989 ◽  
Vol 44 (10) ◽  
pp. 935-944
Author(s):  
Nobuo Takaoka ◽  
Masako Shima ◽  
Fumitaka Wakabayashi
Keyword(s):  
Noble Gas ◽  
Cosmic Ray ◽  
Ordinary Chondrites ◽  
Isotopic Signatures ◽  
Shock Heating ◽  
H Chondrites ◽  
Gas Loss ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Ages ◽  
Gas Component

Abstract Concentrations and isotopic ratios of noble gases are reported for nineteen Japanese chondrites. Among those, Nio (H3-4) is a solar-gas-rich meteorite.U/Th - He ages are younger than K - Ar ages for all meteorites studied. Six of the nine L-chondrites give significantly young K-Ar ages, suggesting gas loss by impact shock heating. The remaining three L-chondrites and seven of the ten H-chondrites have K-Ar ages older than 4 Ga. The L-chondrite Nogata and the H-chondrites Numakai, Ogi and Higashi-Koen have concordant ages.Cosmic-ray exposure ages for six of the H-chondrites show clustering around the 6-Myr peak in the distribution of exposure ages, while those for the L-chondrites, ranging from 8.2 to 64 Myr, do not show clustering.Fukutomi (L4) contains trapped 36Ar in excess, 3.5 times enriched compared to the highest value so far reported for type-4 ordinary chondrites except solar-gas-rich chondrites. The 36Ar/132Xe and 84Kr/132Xe ratios fit along a mixing line between a planetary and a sub-solar (or argon-rich) component found in separates of E-chondrites [43], The Xe isotopic composition is identical with that in Abee and Kenna. The isotopic signatures suggest that this meteorite may contain mineral fragments bearing the noble gas component found in E-chondrites or ureilites. Fukutomi also contains 80Kr, 82Kr and 128Xe produced by epithermal neutron captures on 79Kr, 81Kr and 127I, respectively. From the neutron-produced Kr, the preatmospheric minimum radius is estimated to be 20 cm with an assumption of a spherical meteoroid.

Relationships among lodranites and acapulcoites: noble gas isotopic abundances, chemical composition, cosmic-ray exposure ages, and solar cosmic ray effects

1999 ◽  
Vol 63 (2) ◽  
pp. 175-192 ◽  
Author(s):  
Andreas Weigel ◽  
Otto Eugster ◽  
Christian Koeberl ◽  
Rolf Michel ◽  
Urs Kr̈ahenb̈uhl ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Noble Gas ◽  
Cosmic Ray ◽  
Isotopic Abundances ◽  
Ray Effects ◽  
Exposure Ages ◽  
Cosmic Ray Effects ◽  
Cosmic Ray Exposure Ages

Noble gas concentrations and cosmic ray exposure ages of eight recently fallen chondrites

1973 ◽  
Vol 37 (11) ◽  
pp. 2417-2433 ◽  
Author(s):  
D.D Bogard ◽  
M.A Reynolds ◽  
L.A Simms
Keyword(s):  
Noble Gas ◽  
Cosmic Ray ◽  
Exposure Ages ◽  
Cosmic Ray 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.

The Noble Gas Record in Antarctic and Other Meteorites

1983 ◽  
Vol 38 (2) ◽  
pp. 267-272 ◽  
Author(s):  
H. W. Weber ◽  
O. Braun ◽  
L. Schultz ◽  
F. Begemann
Keyword(s):  
Isotopic Composition ◽  
Noble Gas ◽  
Cosmic Ray ◽  
Retention Model ◽  
Meteorite Fall ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Ages ◽  
Independent Individual

Abstract Data are reported for the concentration and isotopic composition of He, Ne, and Ar in 11 Antarctic and 8 other stone meteorites. Cosmic ray exposure ages and whole rock gas retention model ages are given. The noble gas record suggests that all three ALLAN HILLS eucrites analysed so far belong to the same meteorite fall while the three eucrites from the ELEPHANT MORAINE area appear to be three independent individual falls.

scholarly journals Cosmogenic 45Sc in Gibeon iron meteorite by radioanalytical neutron activation analysis

2011 ◽  
Vol 1 (1) ◽  
pp. 383-386
Author(s):  
Y. Oura ◽  
M. Honda ◽  
M. Ebihara ◽  
K. Bajo ◽  
K. Nagao
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Noble Gases ◽  
Noble Gas ◽  
Radiochemical Neutron Activation Analysis ◽  
Iron Meteorite ◽  
Noble Gas Isotopes ◽  
The Difference ◽  
Exposure Ages

Abstract Cosmogenic nuclides in many fragments of Gibeon iron meteorite have been studied by Honda and co-workers. They observed that their concentrations varied by 5 orders and found that Gibeon gives two different exposure ages using pair of stable noble gas isotopes and radinuclide. To assess one possible cause for the difference, namely loss of partial noble gases due to atmospheric heating of the incoming meteoroid, concentrations of non-volatile and stable cosmogenic 45Sc of Gibeon were determined by radiochemical neutron activation analysis (RNAA). For RNAA, a radiochemical procedure using extraction chromatography was developed to separate Sc from an iron meteorite. Concentrations of 45Sc in 7 fragments ranged from 0.0064 to 0.11 ppb and correlated with cosmogenic 4He concentrations. This correlation suggests that noble gases in Gibeon were not lost during the fall to the earth.

scholarly journals Noble gas space exposure ages of individual interplanetary dust particles

2006 ◽  
Vol 41 (8) ◽  
pp. 1199-1217 ◽  
Author(s):  
Karl Kehm ◽  
George J. Flynn ◽  
Charles M. Hohenberg
Keyword(s):  
Noble Gas ◽  
Interplanetary Dust ◽  
Dust Particles ◽  
Interplanetary Dust Particles ◽  
Gas Space ◽  
Exposure Ages

Constraining post-glacial temperatures of rock avalanche deposits in the Yosemite Valley with cosmogenic noble gas and luminescence paleothermometry

2020 ◽  
Author(s):  
Nathan Brown ◽  
Marissa Tremblay ◽  
Maura Uebner ◽  
Greg Stock ◽  
Greg Balco ◽  
...  
Keyword(s):  
Background Radiation ◽  
Noble Gas ◽  
Rock Avalanche ◽  
Cosmic Ray ◽  
Electronic Charge ◽  
Thermally Activated ◽  
Yosemite Valley ◽  
Defect Sites ◽  
Two Systems ◽  
Exposure Ages

<p>Yosemite Valley is renowned for its striking topography, with many sheer granite cliffs carved during past glaciations. At the base of these cliffs many large rock avalanche deposits can be found that were deposited since ice retreated from Yosemite Valley. Cosmogenic <sup>10</sup>Be measurements indicate that there are at least 10 different rock avalanche deposits that range in age from 13 to ~1 ka.</p><p>In this study, we estimate the time-averaged temperatures experienced by rocks from five of these rock avalanche deposits using cosmogenic noble gas and luminescence paleothermometers. These two systems yield independent estimates of valley floor temperatures during the Holocene, information that is useful for reconstructing the local environmental conditions since deglaciation.</p><p>Cosmogenic noble gas paleothermometry utilizes the fact that cosmogenic noble gases like <sup>3</sup>He experience thermally-activated diffusive loss at Earth surface temperatures in minerals like quartz. The concentration of cosmogenic <sup>3</sup>He in quartz relative to a cosmogenic nuclide that does not experience diffusive loss should therefore be a function of a rock’s thermal history over the duration of its exposure to cosmic ray particles. Apparent <sup>3</sup>He boulder exposure ages from these five rock avalanche deposits are 58 to > 98% younger than the corresponding <sup>10</sup>Be exposure ages. Preliminary models that combine these <sup>3</sup>He observations and sample-specific diffusion parameters indicate that effective diffusion temperatures (EDTs) recorded by <sup>3</sup>He in quartz are similar to or higher than the modern EDT from the instrumental record.</p><p>Like with the cosmogenic <sup>3</sup>He system, thermoluminescence (TL) paleothermometry of K-feldspars also relies upon the balance between steady signal build-up and thermally-activated loss. The difference is that TL derives from trapped electronic charge at defect sites within the feldspar crystal lattice that accumulates in response to natural background radiation. K-feldspar TL signals comprise a range of stabilities. The least stable sites will experience diffusive loss even at temperatures below 0 °C and the most stable sites will accumulate at upper crustal temperatures. By monitoring which sites are occupied and how long those sites have been accumulating charge, we estimate both the ambient temperature and the time spent at that temperature.</p><p>We compare and discuss the history of rock temperatures estimated from these two systems with implications for the post-glacial climate of Yosemite Valley.</p>

scholarly journals Interior textures, chemical compositions, and noble gas signatures of Antarctic cosmic spherules: Possible sources of spherules with long exposure ages

2010 ◽  
Vol 45 (8) ◽  
pp. 1320-1339 ◽  
Author(s):  
Takahito OSAWA ◽  
Yukio YAMAMOTO ◽  
Takaaki NOGUCHI ◽  
Akari IOSE ◽  
Keisuke NAGAO
Keyword(s):  
Noble Gas ◽  
Chemical Compositions ◽  
Cosmic Spherules ◽  
Exposure Ages

Cosmogenic noble gas studies in the oldest landscape on earth: surface exposure ages of the Dry Valleys, Antarctica

1999 ◽  
Vol 167 (3-4) ◽  
pp. 215-226 ◽  
Author(s):  
Jörg M. Schäfer ◽  
Susan Ivy-Ochs ◽  
Rainer Wieler ◽  
Ingo Leya ◽  
Heinrich Baur ◽  
...  
Keyword(s):  
Noble Gas ◽  
Earth Surface ◽  
Dry Valleys ◽  
Exposure Ages
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