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Date |
2017-08-07 |
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Is Part Of |
repository |
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Is Part Of |
p17520908 |
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abstract |
Variability in the sulfur isotopic composition in sediments can reflect atmospheric,
geologic and biological processes. Evidence for ancient fluvio-lacustrine environments
at Gale crater on Mars and a lack of efficient crustal recycling mechanisms on the
planet suggests a surface environment that was once warm enough to allow the presence
of liquid water, at least for discrete periods of time, and implies a greenhouse effect
that may have been influenced by sulfur-bearing volcanic gases. Here we report <i>in
situ</i> analyses of the sulfur isotopic compositions of SO<sub>2</sub> volatilized
from ten sediment samples acquired by NASA’s Curiosity rover along a 13 km traverse
of Gale crater. We find large variations in sulfur isotopic composition that exceed
those measured for Martian meteorites and show both depletion and enrichment in <sup>34</sup>S.
Measured values of δ<sup>34</sup>S range from −47 ± 14‰ to 28 ± 7‰, similar to the
range typical of terrestrial environments. Although limited geochronological constraints
on the stratigraphy traversed by Curiosity are available, we propose that the observed
sulfur isotopic signatures at Gale crater can be explained by equilibrium fractionation
between sulfate and sulfide in an impact-driven hydrothermal system and atmospheric
processing of sulfur-bearing gases during transient warm periods. |
| 50421 |
authorList |
authors |
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status |
peerReviewed |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/636600 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/652182 |
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uri |
http://data.open.ac.uk/oro/document/652642 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/652649 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/652650 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/652651 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/652652 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/652653 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/660910 |
| 50421 |
uri |
http://data.open.ac.uk/oro/document/660962 |
| 50421 |
volume |
10 |
| 50421 |
type |
AcademicArticle |
| 50421 |
type |
Article |
| 50421 |
label |
Franz, H. B.; McAdam, A. C.; Ming, D. W.; Freissinet, C.; Mahaffy, P. R.; Eldridge,
D. L.; Fischer, W. W.; Grotzinger, J. P.; House, C. H.; Hurowitz, J. A.; McLennan,
S. M.; Schwenzer, S. P. ; Vaniman, D. T.; Archer, P. D.; Atreya, S. K.; Conrad, P.
G.; Dottin III, J. W.; Eigenbrode, J. L.; Farley, K. A.; Glavin, D. P.; Johnson, S.
S.; Knudson, C. A.; Morris, R. V.; Navarro-Gonzales, R.; Pavlov, A. A.; Plummer, R.;
Rampe, E. B.; Stern, J. C.; Steele, A.; Summons, R. E. and Sutter, B. (2017). Large
sulfur isotope fractionations in Martian sediments at Gale crater. Nature Geoscience,
10 pp. 658–662. |
| 50421 |
label |
Franz, H. B.; McAdam, A. C.; Ming, D. W.; Freissinet, C.; Mahaffy, P. R.; Eldridge,
D. L.; Fischer, W. W.; Grotzinger, J. P.; House, C. H.; Hurowitz, J. A.; McLennan,
S. M.; Schwenzer, S. P. ; Vaniman, D. T.; Archer, P. D.; Atreya, S. K.; Conrad, P.
G.; Dottin III, J. W.; Eigenbrode, J. L.; Farley, K. A.; Glavin, D. P.; Johnson, S.
S.; Knudson, C. A.; Morris, R. V.; Navarro-Gonzales, R.; Pavlov, A. A.; Plummer, R.;
Rampe, E. B.; Stern, J. C.; Steele, A.; Summons, R. E. and Sutter, B. (2017). Large
sulfur isotope fractionations in Martian sediments at Gale crater. Nature Geoscience,
10 pp. 658–662. |
| 50421 |
Title |
Large sulfur isotope fractionations in Martian sediments at Gale crater |
| 50421 |
in dataset |
oro |