A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism
We present a method that combines Mssbauer spectroscopy and X-ray diffraction to quantify the modal mineralogy of unequilibrated ordinary chondrites (UOCs). Despite being a fundamental tool in the interpretation of geological systems, there are no modal mineralogical data available for these meteori...
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/15148 2023-05-15T13:42:28+02:00 A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism Menzies, O. N. Bland, P. A. Berry, F. J. Cressey, G. 2005-01-01 application/pdf https://journals.uair.arizona.edu/index.php/maps/article/view/15148 eng eng Meteoritics & Planetary Science Archives https://journals.uair.arizona.edu/index.php/maps/article/view/15148/15135 https://journals.uair.arizona.edu/index.php/maps/article/view/15148 Meteoritics & Planetary Science Archives; Vol 40, No 7 (2005); 1023-1042 1945-5100 1086-9379 Mˆssbauer spectroscopy;x-ray diffraction info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2005 ftunivarizonaojs 2020-11-14T17:53:02Z We present a method that combines Mssbauer spectroscopy and X-ray diffraction to quantify the modal mineralogy of unequilibrated ordinary chondrites (UOCs). Despite being a fundamental tool in the interpretation of geological systems, there are no modal mineralogical data available for these meteorites. This is due to their fine-grained nature, highly heterogeneous silicate mineralogy, and the presence of poorly characterized phases. Consequently, it has not been possible to obtain accurate modal mineralogy by conventional techniques such as point counting. Here we use Mssbauer spectroscopy as a preliminary identification technique and X-ray diffraction provides the quantification for a suite of recent UOC falls. We find the most primitive UOCs to contain a significant amount of phyllosilicate material that was converted during metamorphism to form ferromagnesian silicates. A complete suite of Antarctic samples is analyzed by each method to observe mineralogical trends and these are compared with trends shown by recent falls. The fact that mineralogical relationships shown by finds and falls are in agreement allows us to be confident that we are observing the products of pre-terrestrial alteration. Mssbauer spectroscopy reveals evidence of steadily increasing reduction with metamorphism in the UOCs. Because this technique allows comparisons to be made between UOCs and EOCs, our reduction sequence can be combined with other evidence showing progressive oxidation in the EOCs. This yields an integrated model of changing redox conditions on equilibrating ordinary chondrite parent bodies. Article in Journal/Newspaper Antarc* Antarctic Journals at the University of Arizona Antarctic |
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Open Polar |
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Journals at the University of Arizona |
op_collection_id |
ftunivarizonaojs |
language |
English |
topic |
Mˆssbauer spectroscopy;x-ray diffraction |
spellingShingle |
Mˆssbauer spectroscopy;x-ray diffraction Menzies, O. N. Bland, P. A. Berry, F. J. Cressey, G. A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism |
topic_facet |
Mˆssbauer spectroscopy;x-ray diffraction |
description |
We present a method that combines Mssbauer spectroscopy and X-ray diffraction to quantify the modal mineralogy of unequilibrated ordinary chondrites (UOCs). Despite being a fundamental tool in the interpretation of geological systems, there are no modal mineralogical data available for these meteorites. This is due to their fine-grained nature, highly heterogeneous silicate mineralogy, and the presence of poorly characterized phases. Consequently, it has not been possible to obtain accurate modal mineralogy by conventional techniques such as point counting. Here we use Mssbauer spectroscopy as a preliminary identification technique and X-ray diffraction provides the quantification for a suite of recent UOC falls. We find the most primitive UOCs to contain a significant amount of phyllosilicate material that was converted during metamorphism to form ferromagnesian silicates. A complete suite of Antarctic samples is analyzed by each method to observe mineralogical trends and these are compared with trends shown by recent falls. The fact that mineralogical relationships shown by finds and falls are in agreement allows us to be confident that we are observing the products of pre-terrestrial alteration. Mssbauer spectroscopy reveals evidence of steadily increasing reduction with metamorphism in the UOCs. Because this technique allows comparisons to be made between UOCs and EOCs, our reduction sequence can be combined with other evidence showing progressive oxidation in the EOCs. This yields an integrated model of changing redox conditions on equilibrating ordinary chondrite parent bodies. |
format |
Article in Journal/Newspaper |
author |
Menzies, O. N. Bland, P. A. Berry, F. J. Cressey, G. |
author_facet |
Menzies, O. N. Bland, P. A. Berry, F. J. Cressey, G. |
author_sort |
Menzies, O. N. |
title |
A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism |
title_short |
A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism |
title_full |
A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism |
title_fullStr |
A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism |
title_full_unstemmed |
A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism |
title_sort |
mössbauer spectroscopy and x-ray diffraction study of ordinary chondrites: quantification of modal mineralogy and implications for redox conditions during metamorphism |
publisher |
Meteoritics & Planetary Science Archives |
publishDate |
2005 |
url |
https://journals.uair.arizona.edu/index.php/maps/article/view/15148 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Meteoritics & Planetary Science Archives; Vol 40, No 7 (2005); 1023-1042 1945-5100 1086-9379 |
op_relation |
https://journals.uair.arizona.edu/index.php/maps/article/view/15148/15135 https://journals.uair.arizona.edu/index.php/maps/article/view/15148 |
_version_ |
1766168223142641664 |