CO 2 release due to impact devolatilization of carbonate: Results of shock experiments
Abstract A study of pure, single crystal calcite shocked to pressures from 9.0 to 60.8 GPa was conducted to address contradictory data for carbonate shock behavior. The recovered materials were analyzed optically and by transmission electron microscopy (TEM), as well as by thermogravimetry (TGA), X‐...
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crwiley:10.1111/maps.12613 2024-06-23T07:54:04+00:00 CO 2 release due to impact devolatilization of carbonate: Results of shock experiments Bell, Mary Sue Jacobs and NASA's Planetary Geology and Geophysics Program 2016 http://dx.doi.org/10.1111/maps.12613 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12613 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12613 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 51, issue 4, page 619-646 ISSN 1086-9379 1945-5100 journal-article 2016 crwiley https://doi.org/10.1111/maps.12613 2024-06-04T06:48:48Z Abstract A study of pure, single crystal calcite shocked to pressures from 9.0 to 60.8 GPa was conducted to address contradictory data for carbonate shock behavior. The recovered materials were analyzed optically and by transmission electron microscopy (TEM), as well as by thermogravimetry (TGA), X‐ray diffraction (XRD), and Raman‐spectroscopy. In thin section, progressive comminution of calcite is observed although grains remain birefringent to at least 60.8 GPa. TGA analysis reveals a positive correlation between percent of mass loss due to shock and increasing shock pressure ( R = 0.77) and suggests that shock loading leads to the modest removal of structural volatiles in this pressure range. XRD patterns of shocked Iceland spar samples produce peaks that are qualitatively and quantitatively less intense, more diffuse, and shift to lower o 2θ. However, the regularity observed in these shocked powder patterns suggests that structures with very uniform unit cell separations persist to shock pressures as high as 60.8 GPa. Raman spectral analyses indicate no band asymmetry and no systematic peak shifting or broadening. TEM micrographs display progressively diminishing crystallite domain sizes. Selected area electron diffraction (SAED) patterns reveal no signatures of amorphous material. These data show that essentially intact calcite is recovered at shock pressures up to 60.8 GPa with only slight mass loss (~7%). This work suggests that the amount of CO 2 gas derived from shock devolatilization of carbonate by large meteorite impacts into carbonate targets has been (substantially) overestimated. Article in Journal/Newspaper Iceland Wiley Online Library Meteoritics & Planetary Science 51 4 619 646 |
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Wiley Online Library |
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English |
description |
Abstract A study of pure, single crystal calcite shocked to pressures from 9.0 to 60.8 GPa was conducted to address contradictory data for carbonate shock behavior. The recovered materials were analyzed optically and by transmission electron microscopy (TEM), as well as by thermogravimetry (TGA), X‐ray diffraction (XRD), and Raman‐spectroscopy. In thin section, progressive comminution of calcite is observed although grains remain birefringent to at least 60.8 GPa. TGA analysis reveals a positive correlation between percent of mass loss due to shock and increasing shock pressure ( R = 0.77) and suggests that shock loading leads to the modest removal of structural volatiles in this pressure range. XRD patterns of shocked Iceland spar samples produce peaks that are qualitatively and quantitatively less intense, more diffuse, and shift to lower o 2θ. However, the regularity observed in these shocked powder patterns suggests that structures with very uniform unit cell separations persist to shock pressures as high as 60.8 GPa. Raman spectral analyses indicate no band asymmetry and no systematic peak shifting or broadening. TEM micrographs display progressively diminishing crystallite domain sizes. Selected area electron diffraction (SAED) patterns reveal no signatures of amorphous material. These data show that essentially intact calcite is recovered at shock pressures up to 60.8 GPa with only slight mass loss (~7%). This work suggests that the amount of CO 2 gas derived from shock devolatilization of carbonate by large meteorite impacts into carbonate targets has been (substantially) overestimated. |
author2 |
Jacobs and NASA's Planetary Geology and Geophysics Program |
format |
Article in Journal/Newspaper |
author |
Bell, Mary Sue |
spellingShingle |
Bell, Mary Sue CO 2 release due to impact devolatilization of carbonate: Results of shock experiments |
author_facet |
Bell, Mary Sue |
author_sort |
Bell, Mary Sue |
title |
CO 2 release due to impact devolatilization of carbonate: Results of shock experiments |
title_short |
CO 2 release due to impact devolatilization of carbonate: Results of shock experiments |
title_full |
CO 2 release due to impact devolatilization of carbonate: Results of shock experiments |
title_fullStr |
CO 2 release due to impact devolatilization of carbonate: Results of shock experiments |
title_full_unstemmed |
CO 2 release due to impact devolatilization of carbonate: Results of shock experiments |
title_sort |
co 2 release due to impact devolatilization of carbonate: results of shock experiments |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/maps.12613 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12613 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12613 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Meteoritics & Planetary Science volume 51, issue 4, page 619-646 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.12613 |
container_title |
Meteoritics & Planetary Science |
container_volume |
51 |
container_issue |
4 |
container_start_page |
619 |
op_container_end_page |
646 |
_version_ |
1802646009816285184 |