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Clasts in the CM2 carbonaceous chondrite Lonewolf Nunataks 94101 : Evidence for aqueous alteration prior to complex mixing

Lindgren, Paula LU ; Lee, Martin R.; Sofe, Mahmood R. and Zolensky, Michael E. (2013) In Meteoritics and Planetary Science 48(6). p.1074-1090
Abstract

Clasts in the CM2 carbonaceous chondrite Lonewolf Nunataks (LON) 94101 have been characterized using scanning and transmission electron microscopy and electron microprobe analysis to determine their degrees of aqueous alteration, and the timing of alteration relative to incorporation of clasts into the host. The provenance of the clasts, and the mechanism by which they were incorporated and mixed with their host material are also considered. Results show that at least five distinct types of clasts occur in LON 94101, of which four have been aqueously altered to various degrees and one is largely anhydrous. The fact that they have had different alteration histories implies that the main part of aqueous activity occurred prior to the... (More)

Clasts in the CM2 carbonaceous chondrite Lonewolf Nunataks (LON) 94101 have been characterized using scanning and transmission electron microscopy and electron microprobe analysis to determine their degrees of aqueous alteration, and the timing of alteration relative to incorporation of clasts into the host. The provenance of the clasts, and the mechanism by which they were incorporated and mixed with their host material are also considered. Results show that at least five distinct types of clasts occur in LON 94101, of which four have been aqueously altered to various degrees and one is largely anhydrous. The fact that they have had different alteration histories implies that the main part of aqueous activity occurred prior to the mixing and assimilation of the clasts with their host. Further, the presence of such a variety of clasts suggests complex mixing in a dynamic environment involving material from various sources. Two of the clasts, one containing approximately 46 vol% carbonate and the other featuring crystals of pyrrhotite up to approximately 1 mm in size, are examples of unusual lithologies and indicate concentration of chemical elements in discrete areas of the parent body(ies), possibly by flow of aqueous solutions.

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author
publishing date
type
Contribution to journal
publication status
published
in
Meteoritics and Planetary Science
volume
48
issue
6
pages
17 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:84879155622
ISSN
1086-9379
DOI
10.1111/maps.12133
language
English
LU publication?
no
id
9de033c0-17fe-4bf7-bba4-f11704c54048
date added to LUP
2017-06-16 15:57:03
date last changed
2018-05-29 11:17:06
@article{9de033c0-17fe-4bf7-bba4-f11704c54048,
  abstract     = {<p>Clasts in the CM2 carbonaceous chondrite Lonewolf Nunataks (LON) 94101 have been characterized using scanning and transmission electron microscopy and electron microprobe analysis to determine their degrees of aqueous alteration, and the timing of alteration relative to incorporation of clasts into the host. The provenance of the clasts, and the mechanism by which they were incorporated and mixed with their host material are also considered. Results show that at least five distinct types of clasts occur in LON 94101, of which four have been aqueously altered to various degrees and one is largely anhydrous. The fact that they have had different alteration histories implies that the main part of aqueous activity occurred prior to the mixing and assimilation of the clasts with their host. Further, the presence of such a variety of clasts suggests complex mixing in a dynamic environment involving material from various sources. Two of the clasts, one containing approximately 46 vol% carbonate and the other featuring crystals of pyrrhotite up to approximately 1 mm in size, are examples of unusual lithologies and indicate concentration of chemical elements in discrete areas of the parent body(ies), possibly by flow of aqueous solutions.</p>},
  author       = {Lindgren, Paula and Lee, Martin R. and Sofe, Mahmood R. and Zolensky, Michael E.},
  issn         = {1086-9379},
  language     = {eng},
  number       = {6},
  pages        = {1074--1090},
  publisher    = {Wiley-Blackwell},
  series       = {Meteoritics and Planetary Science},
  title        = {Clasts in the CM2 carbonaceous chondrite Lonewolf Nunataks 94101 : Evidence for aqueous alteration prior to complex mixing},
  url          = {http://dx.doi.org/10.1111/maps.12133},
  volume       = {48},
  year         = {2013},
}