| 1. |
|
|
| 2. |
- Arvidson, R. E., et al.
(author)
-
Opportunity Mars Rover mission : Overview and selected results from Purgatory ripple to traverses to Endeavour crater
- 2011
-
In: Journal of Geophysical Research. - Hoboken : Wiley-Blackwell. - 0148-0227 .- 2156-2202. ; 116, s. E00F15-
-
Journal article (peer-reviewed)abstract
- Opportunity has been traversing the Meridiani plains since 25 January 2004 (sol 1), acquiring numerous observations of the atmosphere, soils, and rocks. This paper provides an overview of key discoveries between sols 511 and 2300, complementing earlier papers covering results from the initial phases of the mission. Key new results include (1) atmospheric argon measurements that demonstrate the importance of atmospheric transport to and from the winter carbon dioxide polar ice caps; (2) observations showing that aeolian ripples covering the plains were generated by easterly winds during an epoch with enhanced Hadley cell circulation; (3) the discovery and characterization of cobbles and boulders that include iron and stony-iron meteorites and Martian impact ejecta; (4) measurements of wall rock strata within Erebus and Victoria craters that provide compelling evidence of formation by aeolian sand deposition, with local reworking within ephemeral lakes; (5) determination that the stratigraphy exposed in the walls of Victoria and Endurance craters show an enrichment of chlorine and depletion of magnesium and sulfur with increasing depth. This result implies that regional-scale aqueous alteration took place before formation of these craters. Most recently, Opportunity has been traversing toward the ancient Endeavour crater. Orbital data show that clay minerals are exposed on its rim. Hydrated sulfate minerals are exposed in plains rocks adjacent to the rim, unlike the surfaces of plains outcrops observed thus far by Opportunity. With continued mechanical health, Opportunity will reach terrains on and around Endeavour's rim that will be markedly different from anything examined to date. Copyright 2011 by the American Geophysical Union.
|
|
| 3. |
- Farley, K.A., et al.
(author)
-
In situ radiometric and exposure age dating of the martian surface
- 2014
-
In: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 343:6169
-
Journal article (peer-reviewed)abstract
- We determined radiogenic and cosmogenic noble gases in a mudstone on the floor of Gale Crater. A K-Ar age of 4.21 ± 0.35 billion years represents a mixture of detrital and authigenic components and confirms the expected antiquity of rocks comprising the crater rim. Cosmic-ray-produced 3He, 21Ne, and 36Ar yield concordant surface exposure ages of 78 ± 30 million years. Surface exposure occurred mainly in the present geomorphic setting rather than during primary erosion and transport. Our observations are consistent with mudstone deposition shortly after the Gale impact or possibly in a later event of rapid erosion and deposition. The mudstone remained buried until recent exposure by wind-driven scarp retreat. Sedimentary rocks exposed by this mechanism may thus offer the best potential for organic biomarker preservation against destruction by cosmic radiation.
|
|
| 4. |
|
|
| 5. |
- Arneodo, M, et al.
(author)
-
Accurate measurement of F-2(d)/F-2(p) and R(d)-R(p)
- 1997
-
In: NUCLEAR PHYSICS B. - : ELSEVIER SCIENCE BV. - 0550-3213. ; 487:1-2, s. 3-26
-
Journal article (peer-reviewed)abstract
- Results are presented for F-2(d)/F-2(p) and R(d) - R(p) from simultaneous measurements of deep inelastic muon scattering on hydrogen and deuterium targets, at 90, 120, 200 and 280 GeV. The difference R(d) - R(p), determined in the range 0.002 < x < 0.4 at
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
- Arneodo, M, et al.
(author)
-
The A dependence of the nuclear structure function ratios
- 1996
-
In: NUCLEAR PHYSICS B. - : ELSEVIER SCIENCE BV. - 0550-3213. ; 481:1-2, s. 3-22
-
Journal article (peer-reviewed)abstract
- Results are presented for six nuclei from Be to Pb on the structure function ratios F-2(A)/F-2(C)(X) and their A dependence in deep inelastic muon scattering at 200 GeV incident: muon energy. The data cover the kinematic range 0.01 < x < 0.8 with Q(2) ran
|
|
| 9. |
- ARNEODO, M, et al.
(author)
-
THE STRUCTURE-FUNCTION RATIOS F-2(LI)/F-2(D) AND F-2(C)/F-2(D) AT SMALL-X
- 1995
-
In: NUCLEAR PHYSICS B. - : ELSEVIER SCIENCE BV. - 0550-3213. ; 441:1-2, s. 12-30
-
Journal article (peer-reviewed)abstract
- We present the structure function ratios F-2(Li)/F-2(D) and F-2(C)/F-2(D) measured in deep inelastic muon-nucleus scattering at a nominal incident muon energy of 200 GeV. The kinematic range 10(-4) < x < 0.7 and 0.01 < Q(2) < 70 GeV2 is covered. For value
|
|
| 10. |
- Lanza, Nina L., et al.
(author)
-
Oxidation of manganese in an ancient aquifer, Kimberley formation, Gale crater, Mars
- 2016
-
In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 43:14, s. 7398-7407
-
Journal article (peer-reviewed)abstract
- The Curiosity rover observed high Mn abundances (>25wt % MnO) in fracture-filling materials that crosscut sandstones in the Kimberley region of Gale crater, Mars. The correlation between Mn and trace metal abundances plus the lack of correlation between Mn and elements such as S, Cl, and C, reveals that these deposits are Mn oxides rather than evaporites or other salts. On Earth, environments that concentrate Mn and deposit Mn minerals require water and highly oxidizing conditions; hence, these findings suggest that similar processes occurred on Mars. Based on the strong association between Mn-oxide deposition and evolving atmospheric dioxygen levels on Earth, the presence of these Mn phases on Mars suggests that there was more abundant molecular oxygen within the atmosphere and some groundwaters of ancient Mars than in the present day
|
|
