Evidence for Calcium Carbonate at the Mars Phoenix Landing Site

被引：270

作者：

Boynton, W. V. ^{[1
]}

Ming, D. W. ^{[2
]}

Kounaves, S. P. ^{[3
]}

Young, S. M. M. ^{[3
]}

Arvidson, R. E. ^{[4
]}

Hecht, M. H. ^{[5
]}

Hoffman, J. ^{[6
]}

Niles, P. B. ^{[2
]}

Hamara, D. K. ^{[1
]}

Quinn, R. C. ^{[7
]}

Smith, P. H. ^{[1
]}

Sutter, B. ^{[10
]}

Catling, D. C. ^{[8
,9
]}

Morris, R. V. ^{[2
]}

机构：

[1] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[2] NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA

[3] Tufts Univ, Dept Chem, Medford, MA 02155 USA

[4] Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA

[5] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[6] Univ Texas Dallas, Dept Phys, Richardson, TX 75083 USA

[7] NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA

[8] Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England

[9] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA

[10] NASA, Lyndon B Johnson Space Ctr, Jacobs Engn & Sci Contract Grp, Houston, TX 77058 USA

来源：

SCIENCE | 2009年 / 325卷 / 5936期

关键词：

EVOLVED GAS ANALYZER; MARTIAN METEORITES; CLIMATE; IDENTIFICATION; ASSEMBLAGES; EVAPORITES; MINERALS; ROCKS; ICE;

D O I：

10.1126/science.1172768

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 degrees 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.

引用

页码：61 / 64

页数：4

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