Cosmogonie potassium-40 in iron meteorites

1959 ◽  
Vol 17 (1-2) ◽  
pp. 148-150 ◽  
Author(s):  
Masatake Honda
Keyword(s):  
Iron Meteorites ◽  
Potassium 40

Electron Microscope Observations of Mechanical Metamorphism in Iron Meteorites

1970 ◽  
Vol 28 ◽  
pp. 488-489
Author(s):  
D. Faulkner ◽  
G.W. Lorimer ◽  
H.J. Axon
Keyword(s):  
Electron Microscope ◽  
Defect Structure ◽  
Shock Loading ◽  
List Type ◽  
Iron Meteorites

It is now generally accepted that meteorites are fragments produced by the collision of parent bodies of asteroidal dimensions. Optical metallographic evidence suggests that there exists a group of iron meteorites which exhibit structures similar to those observed in explosively shock loaded iron. It seems likely that shock loading of meteorites could be produced by preterrestrial impact of their parent bodies as mentioned above.We have therefore looked at the defect structure of one of these meteorites (Trenton) and compared the results with those made on a) an unshocked ‘standard’ meteorite (Canyon Diablo)b) an artificially shocked ‘standard’ meteorite (Canyon Diablo) andc) an artificially shocked specimen of pure α-iron.

Evidence for ordered Fe3Ni

1987 ◽  
Vol 45 ◽  
pp. 216-217
Author(s):  
K.B. Reuter ◽  
D.B. Williams ◽  
J.I. Goldstein
Keyword(s):  
Experimental Data ◽  
Martensitic Transformation ◽  
Electron Diffraction ◽  
Room Temperature ◽  
Direct Evidence ◽  
Transformation Product ◽  
Iron Meteorites ◽  
X Ray ◽  
Ni Content ◽  
Temperature Transformation

In the Fe-Ni system, although ordered FeNi and ordered Ni3Fe are experimentally well established, direct evidence for ordered Fe3Ni is unconvincing. Little experimental data for Fe3Ni exists because diffusion is sluggish at temperatures below 400°C and because alloys containing less than 29 wt% Ni undergo a martensitic transformation at room temperature. Fe-Ni phases in iron meteorites were examined in this study because iron meteorites have cooled at slow rates of about 10°C/106 years, allowing phase transformations below 400°C to occur. One low temperature transformation product, called clear taenite 2 (CT2), was of particular interest because it contains less than 30 wtZ Ni and is not martensitic. Because CT2 is only a few microns in size, the structure and Ni content were determined through electron diffraction and x-ray microanalysis. A Philips EM400T operated at 120 kV, equipped with a Tracor Northern 2000 multichannel analyzer, was used.

scholarly journals Age and origin of IIE iron meteorites inferred from Hf-W chronology

2019 ◽  
Vol 262 ◽  
pp. 92-103 ◽  
Author(s):  
Thomas S. Kruijer ◽  
Thorsten Kleine
Keyword(s):  
Iron Meteorites

scholarly journals Determinations of osmium isotope ratios in iron meteorites and iridosmines by ICP-MS.

1986 ◽  
Vol 20 (5) ◽  
pp. 233-239 ◽  
Author(s):  
Akimasa Masuda ◽  
Takafumi Hirata ◽  
Hiroshi Shimizu
Keyword(s):  
Isotope Ratios ◽  
Iron Meteorites ◽  
Icp Ms ◽  
Osmium Isotope

Biological Role of Potassium-40

Nature ◽  
1957 ◽  
Vol 180 (4584) ◽  
pp. 507-508 ◽  
Author(s):  
A. P. VINOGRADOV
Keyword(s):  
Biological Role ◽  
Potassium 40

scholarly journals Cosmogenic effects on Cu isotopes in IVB iron meteorites

2016 ◽  
Vol 182 ◽  
pp. 145-154 ◽  
Author(s):  
Heng Chen ◽  
Frédéric Moynier ◽  
Munir Humayun ◽  
M. Cole Bishop ◽  
Jeffrey T. Williams
Keyword(s):  
Iron Meteorites ◽  
Cu Isotopes

Chemical Classification of Iron Meteorites: XII. New Members of the Magmatic Groups

1998 ◽  
Vol 62 (4) ◽  
pp. 715-724 ◽  
Author(s):  
John T. Wasson ◽  
Byeon-Gak Choi ◽  
Eric A. Jerde ◽  
Finn Ulff-Møller
Keyword(s):  
Iron Meteorites ◽  
New Members ◽  
Chemical Classification
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