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Evidence for Calcium Carbonate at the Mars Phoenix Landing Site.

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Title: Evidence for Calcium Carbonate at the Mars Phoenix Landing Site.
Authors: Boynton, W. V., Ming, D. W., Kounaves, S. P., Young, S. M. M., Arvidson, R. E., Hecht, M. H., Hoffman, J., Niles, P. B., Hamara, D. K., Quinn, R. C., Smith, P. H., Sutter, B., Catling, D. C., Morris, R. V.
Source: Science (pre-March 2025). 7/3/2009, Vol. 325 Issue 5936, p61-64. 4p.
Subjects: Calcium carbonate, Martian exploration, Martian geology, Water on Mars, Soil testing, Calorimetry, Carbon dioxide, Empirical research, Mars (Planet)
Abstract: Carbonates are generally products of aqueous processes and may hold important dues about the history of liquid water on the surface of Mars. Calcium carbonate (approximately 3 to 5 weight percent) has been identified in the soils around the Phoenix landing site by scanning calorimetry showing an endothermic transition beginning around 725°C accompanied by evolution of carbon dioxide and by the ability of the soil to buffer pH against acid addition. Based on empirical kinetics, the amount of calcium carbonate is most consistent with formation in the past by the interaction of atmospheric carbon dioxide with liquid water films on particle surfaces. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Evidence for Calcium Carbonate at the Mars Phoenix Landing Site.
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  Data: <searchLink fieldCode="AR" term="%22Boynton%2C+W%2E+V%2E%22">Boynton, W. V.</searchLink><br /><searchLink fieldCode="AR" term="%22Ming%2C+D%2E+W%2E%22">Ming, D. W.</searchLink><br /><searchLink fieldCode="AR" term="%22Kounaves%2C+S%2E+P%2E%22">Kounaves, S. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Young%2C+S%2E+M%2E+M%2E%22">Young, S. M. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Arvidson%2C+R%2E+E%2E%22">Arvidson, R. E.</searchLink><br /><searchLink fieldCode="AR" term="%22Hecht%2C+M%2E+H%2E%22">Hecht, M. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Hoffman%2C+J%2E%22">Hoffman, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Niles%2C+P%2E+B%2E%22">Niles, P. B.</searchLink><br /><searchLink fieldCode="AR" term="%22Hamara%2C+D%2E+K%2E%22">Hamara, D. K.</searchLink><br /><searchLink fieldCode="AR" term="%22Quinn%2C+R%2E+C%2E%22">Quinn, R. C.</searchLink><br /><searchLink fieldCode="AR" term="%22Smith%2C+P%2E+H%2E%22">Smith, P. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Sutter%2C+B%2E%22">Sutter, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Catling%2C+D%2E+C%2E%22">Catling, D. C.</searchLink><br /><searchLink fieldCode="AR" term="%22Morris%2C+R%2E+V%2E%22">Morris, R. V.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 7/3/2009, Vol. 325 Issue 5936, p61-64. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Calcium+carbonate%22">Calcium carbonate</searchLink><br /><searchLink fieldCode="DE" term="%22Martian+exploration%22">Martian exploration</searchLink><br /><searchLink fieldCode="DE" term="%22Martian+geology%22">Martian geology</searchLink><br /><searchLink fieldCode="DE" term="%22Water+on+Mars%22">Water on Mars</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+testing%22">Soil testing</searchLink><br /><searchLink fieldCode="DE" term="%22Calorimetry%22">Calorimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide%22">Carbon dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Empirical+research%22">Empirical research</searchLink><br /><searchLink fieldCode="DE" term="%22Mars+%28Planet%29%22">Mars (Planet)</searchLink>
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  Data: Carbonates are generally products of aqueous processes and may hold important dues about the history of liquid water on the surface of Mars. Calcium carbonate (approximately 3 to 5 weight percent) has been identified in the soils around the Phoenix landing site by scanning calorimetry showing an endothermic transition beginning around 725°C accompanied by evolution of carbon dioxide and by the ability of the soil to buffer pH against acid addition. Based on empirical kinetics, the amount of calcium carbonate is most consistent with formation in the past by the interaction of atmospheric carbon dioxide with liquid water films on particle surfaces. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=43518114
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        Value: 10.1126/science.1172768
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        Text: English
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        PageCount: 4
        StartPage: 61
    Subjects:
      – SubjectFull: Calcium carbonate
        Type: general
      – SubjectFull: Martian exploration
        Type: general
      – SubjectFull: Martian geology
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      – SubjectFull: Water on Mars
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      – SubjectFull: Soil testing
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      – SubjectFull: Calorimetry
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      – SubjectFull: Carbon dioxide
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      – SubjectFull: Empirical research
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      – SubjectFull: Mars (Planet)
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      – TitleFull: Evidence for Calcium Carbonate at the Mars Phoenix Landing Site.
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              Text: 7/3/2009
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