The weathering of micrometeorites from the Transantarctic Mountains
Micrometeorites are cosmic dust particles recovered from the Earth’s surface that dominate the influx of extraterrestrial material accreting to our planet. This paper provides the first in-depth study of the weathering of micrometeorites within the Antarctic environment that will allow primary and s...
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ftkentuniv:oai:kar.kent.ac.uk:88128 2023-05-15T13:38:02+02:00 The weathering of micrometeorites from the Transantarctic Mountains van Ginneken, Matthias Genge, Matthew J. Folco, Luigi Harvey, Ralph P. 2016-04-15 application/pdf https://kar.kent.ac.uk/88128/ https://kar.kent.ac.uk/88128/1/1-s2.0-S0016703716300011-main%282%29.pdf https://doi.org/10.1016/j.gca.2015.11.045 en eng Meteoritical Society https://kar.kent.ac.uk/88128/1/1-s2.0-S0016703716300011-main%282%29.pdf van Ginneken, Matthias, Genge, Matthew J., Folco, Luigi, Harvey, Ralph P. (2016) The weathering of micrometeorites from the Transantarctic Mountains. Geochimica et Cosmochimica Acta, 179 . pp. 1-31. ISSN 0016-7037. (doi:10.1016/j.gca.2015.11.045 <https://doi.org/10.1016/j.gca.2015.11.045>) (KAR id:88128 </88128>) cc_by QE515 Geochemistry Article PeerReviewed 2016 ftkentuniv https://doi.org/10.1016/j.gca.2015.11.045 2023-03-12T19:19:15Z Micrometeorites are cosmic dust particles recovered from the Earth’s surface that dominate the influx of extraterrestrial material accreting to our planet. This paper provides the first in-depth study of the weathering of micrometeorites within the Antarctic environment that will allow primary and secondary features to be distinguished. It is based on the analysis of 366 particles from Larkman Nunatak and 25 from the Transantarctic Mountain collection. Several important morphological categories of weathering effects were identified: (1) irregular and faceted cavities, (2) surface etch pits, (3) infilled cavities, (4) replaced silicate phases, and (5) hydrated and replaced metal. These features indicate that congruent dissolution of silicate phases, in particular olivine, is important in generating new pore space within particles. Comparison of the preservation of glass and olivine also indicates preferential dissolution of olivine by acidic solutions during low temperature aqueous alteration. Precipitation of new hydrous phases within cavities, in particular ferrihydrite and jarosite, results in pseudomorph textures within heavily altered particles. Glass, in contrast, is altered to palagonite gels and shows a sequential replacement indicative of varying water to rock ratios. Metal is variably replaced by Fe-oxyhydroxides and results in decreases in Ni/Fe ratio. In contrast, sulphides within metal are largely preserved. Magnetite, an essential component of micrometeorites formed during atmospheric entry, is least altered by interaction with the terrestrial environment. The extent of weathering in the studied micrometeorites is sensitive to differences in their primary mineralogy and varies significantly with particle type. Despite these differences, we propose a weathering scale for micrometeorites based on both their degree of terrestrial alteration and the level of encrustation by secondary phases. The compositions and textures of weathering products, however, suggest open system behaviour and variable water ... Article in Journal/Newspaper Antarc* Antarctic University of Kent: KAR - Kent Academic Repository Antarctic Larkman Nunatak ENVELOPE(179.383,179.383,-85.767,-85.767) The Antarctic Transantarctic Mountains Geochimica et Cosmochimica Acta 179 1 31 |
institution |
Open Polar |
collection |
University of Kent: KAR - Kent Academic Repository |
op_collection_id |
ftkentuniv |
language |
English |
topic |
QE515 Geochemistry |
spellingShingle |
QE515 Geochemistry van Ginneken, Matthias Genge, Matthew J. Folco, Luigi Harvey, Ralph P. The weathering of micrometeorites from the Transantarctic Mountains |
topic_facet |
QE515 Geochemistry |
description |
Micrometeorites are cosmic dust particles recovered from the Earth’s surface that dominate the influx of extraterrestrial material accreting to our planet. This paper provides the first in-depth study of the weathering of micrometeorites within the Antarctic environment that will allow primary and secondary features to be distinguished. It is based on the analysis of 366 particles from Larkman Nunatak and 25 from the Transantarctic Mountain collection. Several important morphological categories of weathering effects were identified: (1) irregular and faceted cavities, (2) surface etch pits, (3) infilled cavities, (4) replaced silicate phases, and (5) hydrated and replaced metal. These features indicate that congruent dissolution of silicate phases, in particular olivine, is important in generating new pore space within particles. Comparison of the preservation of glass and olivine also indicates preferential dissolution of olivine by acidic solutions during low temperature aqueous alteration. Precipitation of new hydrous phases within cavities, in particular ferrihydrite and jarosite, results in pseudomorph textures within heavily altered particles. Glass, in contrast, is altered to palagonite gels and shows a sequential replacement indicative of varying water to rock ratios. Metal is variably replaced by Fe-oxyhydroxides and results in decreases in Ni/Fe ratio. In contrast, sulphides within metal are largely preserved. Magnetite, an essential component of micrometeorites formed during atmospheric entry, is least altered by interaction with the terrestrial environment. The extent of weathering in the studied micrometeorites is sensitive to differences in their primary mineralogy and varies significantly with particle type. Despite these differences, we propose a weathering scale for micrometeorites based on both their degree of terrestrial alteration and the level of encrustation by secondary phases. The compositions and textures of weathering products, however, suggest open system behaviour and variable water ... |
format |
Article in Journal/Newspaper |
author |
van Ginneken, Matthias Genge, Matthew J. Folco, Luigi Harvey, Ralph P. |
author_facet |
van Ginneken, Matthias Genge, Matthew J. Folco, Luigi Harvey, Ralph P. |
author_sort |
van Ginneken, Matthias |
title |
The weathering of micrometeorites from the Transantarctic Mountains |
title_short |
The weathering of micrometeorites from the Transantarctic Mountains |
title_full |
The weathering of micrometeorites from the Transantarctic Mountains |
title_fullStr |
The weathering of micrometeorites from the Transantarctic Mountains |
title_full_unstemmed |
The weathering of micrometeorites from the Transantarctic Mountains |
title_sort |
weathering of micrometeorites from the transantarctic mountains |
publisher |
Meteoritical Society |
publishDate |
2016 |
url |
https://kar.kent.ac.uk/88128/ https://kar.kent.ac.uk/88128/1/1-s2.0-S0016703716300011-main%282%29.pdf https://doi.org/10.1016/j.gca.2015.11.045 |
long_lat |
ENVELOPE(179.383,179.383,-85.767,-85.767) |
geographic |
Antarctic Larkman Nunatak The Antarctic Transantarctic Mountains |
geographic_facet |
Antarctic Larkman Nunatak The Antarctic Transantarctic Mountains |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://kar.kent.ac.uk/88128/1/1-s2.0-S0016703716300011-main%282%29.pdf van Ginneken, Matthias, Genge, Matthew J., Folco, Luigi, Harvey, Ralph P. (2016) The weathering of micrometeorites from the Transantarctic Mountains. Geochimica et Cosmochimica Acta, 179 . pp. 1-31. ISSN 0016-7037. (doi:10.1016/j.gca.2015.11.045 <https://doi.org/10.1016/j.gca.2015.11.045>) (KAR id:88128 </88128>) |
op_rights |
cc_by |
op_doi |
https://doi.org/10.1016/j.gca.2015.11.045 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
179 |
container_start_page |
1 |
op_container_end_page |
31 |
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1766100685950025728 |