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Evidence for Calcium Carbonate at the Mars Phoenix Landing Site

by Kounaves, S.P , Smith, P.H , Catling, D.C , Niles, P.B , Hecht, M.H , Arvidson, R.E , Hoffman, J , Hamara, D.K , Morris, R.V , Quinn, R.C , Young, S.M.M , Ming, D.W , Boynton, W.V , Sutter, B

in Acid soils / buffers / Calcareous soils / Calcium Carbonate / Calcium carbonates / Calorimetry / Carbon Dioxide / carbon dioxide production / Carbonates / Chemical compounds / Chemical Precipitation / endothermy / Extraterrestrial Environment / Geochemistry / Hot Temperature / Hydrogen-Ion Concentration / Landing sites / Mars / Ovens / Planetary science / Sedimentary soils / soil / Soils / Space exploration / Spacecraft / Water

2009

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Evidence for Calcium Carbonate at the Mars Phoenix Landing Site

by Kounaves, S.P , Smith, P.H , Catling, D.C , Niles, P.B , Hecht, M.H , Arvidson, R.E , Hoffman, J , Hamara, D.K , Morris, R.V , Quinn, R.C , Young, S.M.M , Ming, D.W , Boynton, W.V , Sutter, B

2009

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Evidence for Calcium Carbonate at the Mars Phoenix Landing Site

by Kounaves, S.P , Smith, P.H , Catling, D.C , Niles, P.B , Hecht, M.H , Arvidson, R.E , Hoffman, J , Hamara, D.K , Morris, R.V , Quinn, R.C , Young, S.M.M , Ming, D.W , Boynton, W.V , Sutter, B

2009

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Journal Article

Evidence for Calcium Carbonate at the Mars Phoenix Landing Site

Kounaves, S.P,

Smith, P.H,

Catling, D.C,

Niles, P.B,

Hecht, M.H,

Arvidson, R.E,

Hoffman, J,

Hamara, D.K,

Morris, R.V,

Quinn, R.C,

Young, S.M.M,

Ming, D.W,

Boynton, W.V,

Sutter, B

2009

Overview

Carbonates are generally products of aqueous processes and may hold important clues 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.

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Publisher

American Association for the Advancement of Science,The American Association for the Advancement of Science

Subject

/ buffers