Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Recrystallization and chemical changes in apatite in response to hypervelocity impact
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0001-8683-3860
Swedish Museum of Natural History, Department of Geology.
Swedish Museum of Natural History, Department of Geology.
Show others and affiliations
2020 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 48, no 1, p. 19-23Article in journal (Refereed) Published
Abstract [en]

Despite the wide utility of apatite, Ca5(PO4)3(F,Cl,OH), in the geosciences, including tracing volatile abundances on the Moon and Mars, little is known about how the mineral responds to the extreme temperatures and pressures associated with hypervelocity impacts. To address this deficiency, we here present the first microstructural analysis and chemical mapping of shocked apatite from a terrestrial impact crater. Apatite grains from the Paasselkä impact structure, Finland, display intragrain crystal-plastic deformation as well as pervasive recrystallization—the first such report in terrestrial apatite. A partially recrystallized grain offers the opportunity to investigate the effect of shock recrystallization on the chemical composition of apatite. The recrystallized portion of the fluorapatite grain is depleted in Mg and Fe relative to the remnant non-recrystallized domain. Strikingly, the recrystallized region alone hosts inclusions of (Mg,Fe)2(PO4)F, wagnerite or a polymorph thereof. These are interpreted to be a product of phase separation during recrystallization and to be related to the reduced abundances of certain elements in the recrystallized domain. The shock-induced recrystallization of apatite, which we show to be related to changes in the mineral’s chemical composition, is not always readily visible in traditional imaging techniques (such as backscattered electron imaging of polished interior surfaces), thus highlighting the need for correlated microstructural, chemical, and isotopic studies of phosphates. This is particularly relevant for extraterrestrial phosphates that may have been exposed to impacts, and we urge the consideration of microstructural data in the interpretation of the primary or secondary nature of elemental abundances and isotopic compositions.

Place, publisher, year, edition, pages
2020. Vol. 48, no 1, p. 19-23
National Category
Geology Geosciences, Multidisciplinary
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3694OAI: oai:DiVA.org:nrm-3694DiVA, id: diva2:1383593
Funder
Knut and Alice Wallenberg Foundation, 2012.0097Swedish Research Council, 621-2012-4370EU, Horizon 2020, 792030Available from: 2020-01-08 Created: 2020-01-08 Last updated: 2020-01-10Bibliographically approved

Open Access in DiVA

The full text will be freely available from 2021-01-01 12:00
Available from 2021-01-01 12:00

Search in DiVA

By author/editor
Kenny, GavinKarlsson, AndreasWhitehouse, MartinBellucci, Jeremy
By organisation
Department of Geology
In the same journal
Geology
GeologyGeosciences, Multidisciplinary

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 16 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf