scholarly journals Noble gases in 18 Martian meteorites and angrite Northwest Africa 7812—Exposure ages, trapped gases, and a re‐evaluation of the evidence for solar cosmic ray‐produced neon in shergottites and other achondrites

2016 ◽  
Vol 51 (2) ◽  
pp. 407-428 ◽  
Author(s):  
R. Wieler ◽  
L. Huber ◽  
H. Busemann ◽  
S. Seiler ◽  
I. Leya ◽  
...  
Keyword(s):  
Noble Gases ◽  
Cosmic Ray ◽  
Northwest Africa ◽  
Trapped Gases ◽  
Martian Meteorites ◽  
Exposure Ages

Investigations of Cosmic-Ray-Produced Nuclides in Iron Meteorites: 5. More Data on the Nuclides of Potassium and Noble Gases, on Exposure Ages and Meteoroid Sizes

1983 ◽  
Vol 38 (2) ◽  
pp. 273-280 ◽  
Author(s):  
H. Voshage ◽  
H. Feldmann ◽  
O. Braun
Keyword(s):  
Noble Gases ◽  
Cosmic Ray ◽  
Parent Body ◽  
Critical Examination ◽  
Iron Meteorites ◽  
Abundance Patterns ◽  
New Information ◽  
Abundance Anomalies ◽  
Chemical Groups ◽  
Exposure Ages

Abstract The concentrations of the cosmic-ray-produced He-, Ne-, and Ar-nuclides in samples of 31 iron meteorites have been determined by mass spectrometry. Thereby, the number of samples analyzed in this laboratory has grown to 83. A critical examination of all these results was performed. The data of at least 52 samples prove to be useful to describe the "normal" abundance patterns of cosmogenic noble gases in iron meteorites; the description is accomplished by a new system of equations that correlate some properly selected abundance ratios with one another. The correlations serve as an instrument to recognize and diagnose certain abundance anomalies (3He-or 38Ar-deficiencies) which occur in about 25% of all samples analyzed. They allow to select those data which may unhesitatingly be applied in calculations concerning the irradiation histories of the respective meteorites. Another matter of concern for establishing these histories are the cosmic-ray-exposure ages. Mass spectrometric abundance analyses on meteoritic potassium have provided new data on the 41K/40K exposure ages of about 10 iron meteorites as well as on meteoroid sizes and sample depths. For two meteorites of the chemical group IIIAB, Joe Wright Mountains and Picacho, the age values obtained are 685 and 635 Ma, respectively. The results confirm our previous conclusion that the IIIAB-irons resided originally within a more or less contiguous partial volume (metallic core?) of their parent body and were ejected in consequence of a single impact event that happened about 670 Ma ago. Another motive for the present investigation was to measure the exposure ages for meteorites of the chemical groups IIICD and HIE. However, the new information obtained on their age distributions is still inadequate to answer some old questions concerning a possible relationship to the event that produced the IIIAB-meteoroids 670 Ma ago.

scholarly journals Ejecta transfer between terrestrial planets

1996 ◽  
Vol 172 ◽  
pp. 229-232
Author(s):  
B.J. Gladman ◽  
J.A. Burns ◽  
H. Levison ◽  
M.J. Duncan
Keyword(s):  
Cosmic Ray ◽  
Terrestrial Planets ◽  
The Moon ◽  
Gravitational Perturbations ◽  
Martian Meteorites ◽  
Exposure Ages ◽  
Escape Speed ◽  
Lunar Meteorites ◽  
Cosmic Ray Exposure Ages

As meteorites from the Moon and Mars continue to be discovered, it is increasingly clear that impact fragments can escape from large bodies more easily than previously believed. These escaping fragments are then subject to the gravitational perturbations of the planets, allowing them to be transferred to a body other than their parent. The lunar meteorites and SNC meteorites prove the plausibility of this process. Warren (1994) summarizes cosmic ray exposure ages and other properties of the lunar and martian meteorites. Their existence confirms that lightly shocked material can be launched at greater than the escape speed of the Moon and Mars.

Cosmic-ray induced production of radioactive noble gases in the atmosphere, ground, and seawater

2015 ◽  
Vol 305 (1) ◽  
pp. 183-192 ◽  
Author(s):  
William H. Wilson ◽  
Christine M. Johnson ◽  
Justin D. Lowrey ◽  
Steven R. Biegalski ◽  
Derek A. Haas
Keyword(s):  
Noble Gases ◽  
Cosmic Ray

scholarly journals Noble gases in twenty-one Saharan LL-chondrites: Exposure ages and possible pairings

1998 ◽  
Vol 33 (2) ◽  
pp. 259-265 ◽  
Author(s):  
P. SCHERER ◽  
S. HERRMANN ◽  
L. SCHULTZ
Keyword(s):  
Noble Gases ◽  
Exposure Ages

Cosmic ray exposure ages of tektites by the fission-track technique

1965 ◽  
Vol 70 (6) ◽  
pp. 1491-1496 ◽  
Author(s):  
R. L. Fleischer ◽  
C. W. Naeser ◽  
P. B. Price ◽  
R. M. Walker ◽  
M. Maurette
Keyword(s):  
Fission Track ◽  
Cosmic Ray ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Ages

40Ar-39Ar and cosmic-ray exposure ages of nakhlites-Nakhla, Lafayette, Governador Valadares-and Chassigny

2011 ◽  
Vol 46 (9) ◽  
pp. 1397-1417 ◽  
Author(s):  
Ekaterina V. KOROCHANTSEVA ◽  
Susanne P. SCHWENZER ◽  
Alexei I. BUIKIN ◽  
Jens HOPP ◽  
Ulrich OTT ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Ages

Meteorites with short cosmic-ray exposure ages, as determined from their Al26 content

1967 ◽  
Vol 31 (10) ◽  
pp. 1793-1809 ◽  
Author(s):  
Dieter Heymann ◽  
Edward Anders ◽  
M.W Rowe
Keyword(s):  
Cosmic Ray ◽  
Exposure Ages ◽  
Cosmic Ray Exposure Ages
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