Chemistry and texture of the rocks at Rocknest, Gale Crater: Evidence for sedimentary origin and diagenetic alteration

被引：45

作者：

Blaney, D. L. ^{[1
]}

Wiens, R. C. ^{[2
]}

Maurice, S. ^{[3
]}

Clegg, S. M. ^{[2
]}

Anderson, R. B. ^{[4
]}

Kah, L. C. ^{[5
]}

Le Mouelic, S. ^{[6
]}

Ollila, A. ^{[7
]}

Bridges, N. ^{[8
]}

Tokar, R. ^{[9
]}

Berger, G. ^{[3
]}

Bridges, J. C. ^{[10
]}

Cousin, A. ^{[2
]}

Clark, B. ^{[11
]}

Dyar, M. D. ^{[12
]}

King, P. L. ^{[13
]}

Lanza, N. ^{[2
]}

Mangold, N. ^{[6
]}

Meslin, P. -Y. ^{[3
]}

Newsom, H. ^{[7
]}

Schroeder, S. ^{[3
]}

Rowland, S. ^{[14
]}

Johnson, J. ^{[8
]}

Edgar, L. ^{[15
]}

Gasnault, O. ^{[3
]}

Forni, O. ^{[3
]}

Schmidt, M. ^{[16
]}

Goetz, W. ^{[17
]}

Stack, K. ^{[18
]}

Sumner, D. ^{[19
]}

Fisk, M. ^{[20
]}

Madsen, M. B. ^{[21
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA

[2] Alamos Natl Lab, Los Alamos, NM USA

[3] Univ Paul Sabatier, Inst Rech Astrophys & Planetol, UPS OMP, Toulouse, France

[4] S Geol Survey Astrogeol Sci Ctr, Flagstaff, AZ USA

[5] Univ Tennessee, Earth & Planetary Sci, Knoxville, TN USA

[6] Univ Nantes, CNRS, LPG Nantes, UMR6112, Nantes, France

[7] Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA

[8] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[9] Planetary Sci Inst, Tucson, AZ USA

[10] Univ Leicester, Dept Phys & Astron, Space Res Ctr, Leicester, Leics, England

[11] Space Sci Inst, Boulder, CO USA

[12] Mt Holyoke Coll, Dept Astron, S Hadley, MA 01075 USA

[13] Australia Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia

[14] Univ Hawaii Manoa, Sch Ocean & Earth Sci & Technol, Honolulu, HI USA

[15] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA

[16] Brock Univ, Dept Earth Sci, St Catharines, ON, Canada

[17] Max Planck Inst Sonnensystemforschung, Katlenburg Lindau, Germany

[18] CALTECH, Pasadena, CA USA

[19] Univ Calif, Dept Geol, Davis, CA USA

[20] Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA

[21] Univ Copenhagen, Niels Bohr Inst, Copenhagen, Denmark

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS | 2014年 / 119卷 / 09期

关键词：

Rocknest; ChemCam; LIBS; Curiosity; Gale; INDUCED BREAKDOWN SPECTROSCOPY; CHEMCAM INSTRUMENT SUITE; CURIOSITY ROVER; MARS; SCIENCE; CALIBRATION; TRAVERSE; TARGETS; MAHLI; UNIT;

D O I：

10.1002/2013JE004590

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A suite of eight rocks analyzed by the Curiosity Rover while it was stopped at the Rocknest sand ripple shows the greatest chemical divergence of any potentially sedimentary rocks analyzed in the early part of the mission. Relative to average Martian soil and to the stratigraphically lower units encountered as part of the Yellowknife Bay formation, these rocks are significantly depleted in MgO, with a mean of 1.3 wt %, and high in Fe, averaging over 20 wt % FeOT, with values between 15 and 26wt % FeOT. The variable iron and low magnesium and rock texture make it unlikely that these are igneous rocks. Rock surface textures range from rough to smooth, can be pitted or grooved, and show various degrees of wind erosion. Some rocks display poorly defined layering while others seem to show possible fractures. Narrow vertical voids are present in Rocknest 3, one of the rocks showing the strongest layering. Rocks in the vicinity of Rocknest may have undergone some diagenesis similar to other rocks in the Yellowknife Bay Formation as indicated by the presence of soluble calcium phases. The most reasonable scenario is that fine-grained sediments, potentially a mixture of feldspar-rich rocks from Bradbury Rise and normal Martian soil, were lithified together by an iron-rich cement.

引用

页码：2109 / 2131

页数：23

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