Constraints on iron sulfate and iron oxide mineralogy from ChemCam visible/near-infrared reflectance spectroscopy of Mt. Sharp basal units, Gale Crater, Mars
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Jeffrey R. Johnson
, James F. Bell
Abstract
Relative reflectance point spectra (400–840 nm) were acquired by the Chemistry and Camera (ChemCam) instrument on the Mars Science Laboratory (MSL) rover Curiosity in passive mode (no laser) of drill tailings and broken rock fragments near the rover as it entered the lower reaches of Mt. Sharp and of landforms at distances of 2–8 km. Freshly disturbed surfaces are less subject to the spectral masking effects of dust, and revealed spectral features consistent with the presence of iron oxides and ferric sulfates. We present the first detection on Mars of a ~433 nm absorption band consistent with small abundances of ferric sulfates, corroborated by jarosite detections by the Chemistry and Mineralogy (CheMin) X-ray diffraction instrument in the Mojave, Telegraph Peak, and Confidence Hills drilled samples. Disturbed materials near the Bonanza King region also exhibited strong 433 nm bands and negative near-infrared spectral slopes consistent with jarosite. ChemCam passive spectra of the Confidence Hills and Mojave drill tailings showed features suggestive of the crystalline hematite identified by CheMin analyses. The Windjana drill sample tailings exhibited flat, low relative reflectance spectra, explained by the occurrence of magnetite detected by CheMin. Passive spectra of Bonanza King were similar, suggesting the presence of spectrally dark and neutral minerals such as magnetite. Long-distance spectra of the “Hematite Ridge” feature (3–5 km from the rover) exhibited features consistent with crystalline hematite. The Bagnold dune field north of the Hematite Ridge area exhibited low relative reflectance and near-infrared features indicative of basaltic materials (olivine, pyroxene). Light-toned layers south of Hematite Ridge lacked distinct spectral features in the 400–840 nm region, and may represent portions of nearby clay minerals and sulfates mapped with orbital near-infrared observations. The presence of ferric sulfates such as jarosite in the drill tailings suggests a relatively acidic environment, likely associated with flow of iron-bearing fluids, associated oxidation, and/or hydrothermal leaching of sedimentary rocks. Combined with other remote sensing data sets, mineralogical constraints from ChemCam passive spectra will continue to play an important role in interpreting the mineralogy and composition of materials encountered as Curiosity traverses further south within the basal layers of the Mt. Sharp complex.
Special collection information can be found at http://www.minsocam.org/MSA/AmMin/special-collections.html.
Acknowledgments
This work was funded by the NASA Mars Science Laboratory Participating Scientist program through the Jet Propulsion Laboratory (contract 1350588). The U.S. portion of ChemCam and MSL rover operations was funded by NASA’s Mars Exploration Program. The French contribution to MSL is supported by the Centre National d’Etudes Spatiales (CNES). Work by K. Kinch was supported by the Danish Council for Independent Research/Natural Sciences (FNU grant 12 127126). A. Fraeman is supported by Keck Institute for Space Studies and Caltech GPS division Texaco postdoctoral fellowships. The authors thank W. Farrand and an anonymous reviewer for their helpful suggestions, and to J. Bishop for valuable editorial recommendations. Relative reflectance spectra used in Figures 10, 14, and 15 are available as supplemental material[1].
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© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Highlights and Breakthroughs
- New evidence for lunar basalt metasomatism by underlying regolith
- Highlights and Breakthroughs
- Alunite on Mars
- Special collection: martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
- Constraints on iron sulfate and iron oxide mineralogy from ChemCam visible/near-infrared reflectance spectroscopy of Mt. Sharp basal units, Gale Crater, Mars
- Special collection: martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
- Esperance: Multiple episodes of aqueous alteration involving fracture fills and coatings at Matijevic Hill, Mars
- Special collection: Martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
- Discovery of alunite in cross crater, terra sirenum, mars: evidence for acidic, sulfurous waters
- Special collection: perspectives on origins and evolution of crustal magmas
- Granitoid magmas preserved as melt inclusions in high-grade metamorphic rocks
- Chemistry and mineralogy of earth’s mantle
- Incorporation of Fe2+ and Fe3+ in bridgmanite during magma ocean crystallization
- Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
- Hydrogen diffusion in Ti-doped forsterite and the preservation of metastable point defects
- Crossroads in earth and planetary materials
- Mineralogy of paloverde (parkinsonia microphylla) tree ash from the sonoran desert: a combined field and laboratory study
- Research Article
- D-poor hydrogen in lunar mare basalts assimilated from lunar regolith
- Research Article
- Mineral chemistry and petrogenesis of a HFSE(+HREE) occurrence, peripheral to carbonatites of the Bear Lodge alkaline complex, Wyoming
- Research Article
- Formation of the lunar highlands Mg-suite as told by spinel
- Research Article
- Vaterite: interpretation in terms of OD theory and its next of kin
- Research Article
- Metastable structural transformations and pressure-induced amorphization in natural (Mg,Fe)2SiO4 olivine under static compression: a raman spectroscopic study
- Research Article
- High-pressure compressibility and thermal expansion of aragonite
- Research Article
- Electronic transitions of iron in almandine-composition glass to 91 GPa
- Research Article
- Interstratification of graphene-like carbon layers within black talc from Southeastern China: Implications to sedimentary talc formation
- Research Article
- What is the actual structure of samarskite-(Y)? A TEM investigation of metamict samarskite from the garnet codera dike pegmatite (Central Italian Alps)
- Research Article
- Detection of liquid H2O in vapor bubbles in reheated melt inclusions: implications for magmatic fluid composition and volatile budgets of magmas?
- Letter
- Interface coupled dissolution-reprecipitation in garnet from subducted granulites and ultrahigh-pressure rocks revealed by phosphorous, sodium, and titanium zonation
- Letter
- Discreditation of diomignite and its petrologic implications
- Letter
- Accurate determination of ferric iron in garnets
- Erratum
- Accurate determination of ferric iron in garnets by bulk Mössbauer and synchrotron micro-XANES spectroscopies
- New Mineral Names
- New Mineral Names
Articles in the same Issue
- Highlights and Breakthroughs
- New evidence for lunar basalt metasomatism by underlying regolith
- Highlights and Breakthroughs
- Alunite on Mars
- Special collection: martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
- Constraints on iron sulfate and iron oxide mineralogy from ChemCam visible/near-infrared reflectance spectroscopy of Mt. Sharp basal units, Gale Crater, Mars
- Special collection: martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
- Esperance: Multiple episodes of aqueous alteration involving fracture fills and coatings at Matijevic Hill, Mars
- Special collection: Martian rocks and minerals: perspectives from rovers, orbiters, and meteorites
- Discovery of alunite in cross crater, terra sirenum, mars: evidence for acidic, sulfurous waters
- Special collection: perspectives on origins and evolution of crustal magmas
- Granitoid magmas preserved as melt inclusions in high-grade metamorphic rocks
- Chemistry and mineralogy of earth’s mantle
- Incorporation of Fe2+ and Fe3+ in bridgmanite during magma ocean crystallization
- Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
- Hydrogen diffusion in Ti-doped forsterite and the preservation of metastable point defects
- Crossroads in earth and planetary materials
- Mineralogy of paloverde (parkinsonia microphylla) tree ash from the sonoran desert: a combined field and laboratory study
- Research Article
- D-poor hydrogen in lunar mare basalts assimilated from lunar regolith
- Research Article
- Mineral chemistry and petrogenesis of a HFSE(+HREE) occurrence, peripheral to carbonatites of the Bear Lodge alkaline complex, Wyoming
- Research Article
- Formation of the lunar highlands Mg-suite as told by spinel
- Research Article
- Vaterite: interpretation in terms of OD theory and its next of kin
- Research Article
- Metastable structural transformations and pressure-induced amorphization in natural (Mg,Fe)2SiO4 olivine under static compression: a raman spectroscopic study
- Research Article
- High-pressure compressibility and thermal expansion of aragonite
- Research Article
- Electronic transitions of iron in almandine-composition glass to 91 GPa
- Research Article
- Interstratification of graphene-like carbon layers within black talc from Southeastern China: Implications to sedimentary talc formation
- Research Article
- What is the actual structure of samarskite-(Y)? A TEM investigation of metamict samarskite from the garnet codera dike pegmatite (Central Italian Alps)
- Research Article
- Detection of liquid H2O in vapor bubbles in reheated melt inclusions: implications for magmatic fluid composition and volatile budgets of magmas?
- Letter
- Interface coupled dissolution-reprecipitation in garnet from subducted granulites and ultrahigh-pressure rocks revealed by phosphorous, sodium, and titanium zonation
- Letter
- Discreditation of diomignite and its petrologic implications
- Letter
- Accurate determination of ferric iron in garnets
- Erratum
- Accurate determination of ferric iron in garnets by bulk Mössbauer and synchrotron micro-XANES spectroscopies
- New Mineral Names
- New Mineral Names