Water and chlorine content in the Martian soil along the first 1900 m of the Curiosity rover traverse as estimated by the DAN instrument

I. G. Mitrofanov, M. L. Litvak, A. B. Sanin, R. D. Starr, D. I. Lisov, R. O. Kuzmin, A. Behar, W. V. Boynton, Craig Hardgrove, K. Harshman, I. Jun, R. E. Milliken, M. A. Mischna, J. E. Moersch, C. G. Tate

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The presence of hydrated phases in the soil and near-surface bedrock of Gale Crater is thought to be direct evidence for water-rock interaction in the crater in the ancient past. Layered sediments over the Gale Crater floor are thought to have formed in past epochs due to sediment transport, accumulation, and cementation through interaction with fluids, and the observed strata of water-bearing minerals record the history of these episodes. The first data analysis of the Dynamic Albedo of Neutrons (DAN) investigation on board the Curiosity rover is presented for 154 individual points of active mode measurements along 1900 m of the traverse over the first 361 Martian solar days in Gale crater. It is found that a model of constant water content within subsurface should be rejected for practically all tested points, whereas a two-layer model with different water contents in each layer is supported by the data. A so-called direct two-layer model (water content increasing with depth) yields acceptable fits for odometry ranges between 0 and 455 m and beyond 638 m. The mean water (H<inf>2</inf>O) abundances of the top and bottom layers vary from 1.5 to 1.7 wt % and from 2.2 to 3.3 wt %, respectively, while at some tested spots the water content is estimated to be as high as ∼ 5 wt %. The data for odometry range 455-638 m support an inverse two-layer model (water content decreasing with depth), with an estimated mean water abundance of 2.1 ± 0.1 wt % and 1.4 ± 0.04 wt % in the top and bottom layers, respectively. Key Points First analysis of active neutron data from DAN instrument on board MSL rover Estimations of water distribution along MSL rover traverse by DAN instrument Estimations of chlorine abundance along MSL rover traverse by DAN instrument

Original languageEnglish (US)
Pages (from-to)1579-1596
Number of pages18
JournalJournal of Geophysical Research: Solid Earth
Volume119
Issue number7
DOIs
StatePublished - 2014
Externally publishedYes

Fingerprint

Chlorine
albedo
Water content
moisture content
chlorine
soils
Neutrons
Soils
craters
neutrons
water content
crater
Water
soil
water
Bearings (structural)
Sediment transport
cementation
sediment transport
water-rock interaction

Keywords

  • Curiosity
  • DAN
  • Mars
  • MSL
  • neutrons
  • water

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Water and chlorine content in the Martian soil along the first 1900 m of the Curiosity rover traverse as estimated by the DAN instrument. / Mitrofanov, I. G.; Litvak, M. L.; Sanin, A. B.; Starr, R. D.; Lisov, D. I.; Kuzmin, R. O.; Behar, A.; Boynton, W. V.; Hardgrove, Craig; Harshman, K.; Jun, I.; Milliken, R. E.; Mischna, M. A.; Moersch, J. E.; Tate, C. G.

In: Journal of Geophysical Research: Solid Earth, Vol. 119, No. 7, 2014, p. 1579-1596.

Research output: Contribution to journalArticle

Mitrofanov, IG, Litvak, ML, Sanin, AB, Starr, RD, Lisov, DI, Kuzmin, RO, Behar, A, Boynton, WV, Hardgrove, C, Harshman, K, Jun, I, Milliken, RE, Mischna, MA, Moersch, JE & Tate, CG 2014, 'Water and chlorine content in the Martian soil along the first 1900 m of the Curiosity rover traverse as estimated by the DAN instrument', Journal of Geophysical Research: Solid Earth, vol. 119, no. 7, pp. 1579-1596. https://doi.org/10.1002/2013JE004553
Mitrofanov, I. G. ; Litvak, M. L. ; Sanin, A. B. ; Starr, R. D. ; Lisov, D. I. ; Kuzmin, R. O. ; Behar, A. ; Boynton, W. V. ; Hardgrove, Craig ; Harshman, K. ; Jun, I. ; Milliken, R. E. ; Mischna, M. A. ; Moersch, J. E. ; Tate, C. G. / Water and chlorine content in the Martian soil along the first 1900 m of the Curiosity rover traverse as estimated by the DAN instrument. In: Journal of Geophysical Research: Solid Earth. 2014 ; Vol. 119, No. 7. pp. 1579-1596.
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AU - Lisov, D. I.

AU - Kuzmin, R. O.

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