dc.contributor.author |
Shaheen, Robina |
en |
dc.contributor.author |
Niles, Paul B. |
en |
dc.contributor.author |
Chong, Kenneth |
en |
dc.contributor.author |
Corrigan, Catherine M. |
en |
dc.contributor.author |
Thiemens, Mark H. |
en |
dc.date.accessioned |
2015-04-20T15:15:44Z |
|
dc.date.available |
2015-04-20T15:15:44Z |
|
dc.date.issued |
2014 |
|
dc.identifier.citation |
Shaheen, Robina, Niles, Paul B., Chong, Kenneth, Corrigan, Catherine M., and Thiemens, Mark H. 2014. "Carbonate formation events in ALH 84001 trace the evolution of the Martian atmosphere." <em>Proceedings of the National Academy of Sciences of the United States of America</em>. 112 (2):336–341. <a href="https://doi.org/10.1073/pnas.1315615112">https://doi.org/10.1073/pnas.1315615112</a> |
en |
dc.identifier.issn |
0027-8424 |
|
dc.identifier.uri |
http://hdl.handle.net/10088/25501 |
|
dc.description.abstract |
Carbonate minerals provide critical information for defining atmosphere-hydrosphere interactions. Carbonate minerals in the Martian meteorite ALH 84001 have been dated to ~3.9 Ga, and both C and O-triple isotopes can be used to decipher the planet's climate history. Here we report ?(17)O, d(18)O, and d(13)C data of ALH 84001 of at least two varieties of carbonates, using a stepped acid dissolution technique paired with ion microprobe analyses to specifically target carbonates from distinct formation events and constrain the Martian atmosphere-hydrosphere-geosphere interactions and surficial aqueous alterations. These results indicate the presence of a Ca-rich carbonate phase enriched in (18)O that formed sometime after the primary aqueous event at 3.9 Ga. The phases showed excess (17)O (0.7 ) that captured the atmosphere-regolith chemical reservoir transfer, as well as CO2, O3, and H2O isotopic interactions at the time of formation of each specific carbonate. The carbon isotopes preserved in the Ca-rich carbonate phase indicate that the Noachian atmosphere of Mars was substantially depleted in (13)C compared with the modern atmosphere. |
en |
dc.relation.ispartof |
Proceedings of the National Academy of Sciences of the United States of America |
en |
dc.title |
Carbonate formation events in ALH 84001 trace the evolution of the Martian atmosphere |
en |
dc.type |
Journal Article |
en |
dc.identifier.srbnumber |
133396 |
|
dc.identifier.doi |
10.1073/pnas.1315615112 |
|
rft.jtitle |
Proceedings of the National Academy of Sciences of the United States of America |
|
rft.volume |
112 |
|
rft.issue |
2 |
|
rft.spage |
336 |
|
rft.epage |
341 |
|
dc.description.SIUnit |
NH-Mineral Sciences |
en |
dc.description.SIUnit |
NMNH |
en |
dc.description.SIUnit |
Peer-reviewed |
en |
dc.citation.spage |
336 |
|
dc.citation.epage |
341 |
|