Nonmagmatic meteorite
Nonmagmatic meteorite | |
---|---|
— Goose Lake Meteorite is an IAB meteorite in the sLL subgroup (low-Au, low-Ni) | |
Compositional type | Iron |
Type | Iron |
Subgroups |
|
Alternative names | Nonmagmatic iron meteorites |
Nonmagmatic meteorite (also nonmagmatic iron meteorite) is a deprecated term formerly used in
Description
In the 1970s, it was realized that some of the iron meteorite groups had properties that were incompatible with this formation mechanism, leading some scientists to posit that they were not formed through this mechanism.[2]
Today, the processes that lead to these unusual properties are described as partial melting and subsequent fast cooling, which prevented melt migration.[3] The most likely cause for this to happen are impact events.[3][4]
The term "nonmagmatic" is still sometimes used to refer to this grouping of meteorites, although its use is now deprecated.[5]
Subdivision
Three
The following table shows the groups are described as nonmagmatic and their classification:
Group | Currently classified as | Compositional type |
---|---|---|
IAB |
Primitive achondrite[2] | Iron meteorite |
IIICD |
Primitive achondrite[2] | Iron meteorite |
IIE | Achondrite[2] | Iron meteorite |
See also
References
- ^ .
- ^ ISBN 978-0816525621. Retrieved 15 December 2012.
- ^ .
- hdl:2060/20020080608.
- .
- ISBN 978-0816522811. Retrieved 31 December 2012.