Mössbauer Spectroscopy of Minerals

McCammon, Catherine

doi:10.1029/rf002p0332

Cited by 146 publications

(7 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Samples from Jen's Vent 1 showed two fitted doublets with chemical isomer shifts (IS) of 0.30 mm/s and 1.06 mm/s, and quadrupole splitting (QS) of 0.60 mm/s and 1.99 mm/s, respectively. The doublet with small IS and QS values was assigned to low-spin Fe 2+ in pyrite [66], while that with large IS and QS values was assigned to high-spin Fe 2+ on the lattice of clay minerals. Although Fe 2+ in pyrite has similar hyperfine parameters to those of Fe 3+ on the lattice of ferric iron oxides, detailed SEM observations and previous geochemical measurements (Table 1; [41,55]) confirmed the existence of pyrite rather than ferric iron oxides.…”

Section: Resultsmentioning

confidence: 99%

A Complex Assemblage of Crystal Habits of Pyrite in the Volcanic Hot Springs from Kamchatka, Russia: Implications for the Mineral Signature of Life on Mars

Tang

2020

Crystals

View full text Add to dashboard Cite

In this study, the crystal habits of pyrite in the volcanic hot springs from Kamchatka, Russia were surveyed using scanning electron microscopy. Pyrite crystals occur either as single euhedral crystals or aggregates with a wide range of crystal sizes and morphological features. Single euhedral crystals, with their sizes ranging from ~200 nm to ~40 µm, exhibit combinations of cubic {100}, octahedral {111}, and pyritohedral {210} and {310} forms. Heterogeneous geochemical microenvironments and the bacterial activities in the long-lived hot springs have mediated the development and good preservation of the complex pyrite crystal habits: irregular, spherulitic, cubic, or octahedral crystals congregating with clay minerals, and nanocrystals attaching to the surface of larger pyrite crystals and other minerals. Spherulitic pyrite crystals are commonly covered by organic matter-rich thin films. The coexistence of various sizes and morphological features of those pyrite crystals indicates the results of secular interactions between the continuous supply of energy and nutritional elements by the hot springs and the microbial communities. We suggest that, instead of a single mineral with unique crystal habits, the continuous deposition of the same mineral with a complex set of crystal habits results from the ever-changing physicochemical conditions with contributions from microbial mediation.

show abstract

Section: Resultsmentioning

confidence: 99%

A Complex Assemblage of Crystal Habits of Pyrite in the Volcanic Hot Springs from Kamchatka, Russia: Implications for the Mineral Signature of Life on Mars

Tang

2020

Crystals

View full text Add to dashboard Cite

show abstract

“…Because, in our application, the reference α-Fe foil and martian surface targets are at the same temperature, the values obtained for δ may be directly compared with databases complied from measurements made with source and absorber at ambient laboratory temperatures (e.g., Burns and Solberg, 1990;Burns, 1993;McCammon, 1995;Stevens et al, 1998). However, both ∆E Q and B hf may exhibit a temperature dependence, which if significant would require either a database obtained on samples measured at the same temperatures as the MER targets or extrapolation of MER results to laboratory temperatures based on the temperature variation observed by the MER instruments.…”

Section: Instrument and Methodsmentioning

confidence: 99%

Mössbauer Spectroscopy at Gusev Crater and Meridiani Planum

Morris¹,

Schröder²,

Klingelhöfer³

et al. 2019

Remote Compositional Analysis

View full text Add to dashboard Cite

Mössbauer instruments were included on the Mars Exploration Rover (MER) Mission to determine the mineralogical composition, diversity, and oxidation state of Fe-bearing igneous materials and alteration products. A total of 16 Fe-bearing phases (mutually consistent with bulksample chemistry) were identified, including Fe associated with the rock-forming minerals olivine, pyroxene, magnetite, ilmenite, and chromite and alteration products including Fe 3+bearing oxyhydroxides (nanophase ferric oxide, hematite, and goethite) and sulfates (jarosite and an unassigned Fe 3+ sulfate phase), and Fe 2+ carbonate. Igneous rock types ranged from olivinepyroxene and olivine-pyroxene-magnetite basalts to ultramafic rocks at Gusev Crater. Jarositehematite bedrock was pervasive at Meridiani Planum, and concretions winnowed from the outcrop were mineralogically hematite. Because their structures contain hydroxyl, goethite and jarosite provide mineralogical evidence for aqueous processes on Mars, and jarosite and Fe 3+sulfate are evidence for acid-sulfate processes at both Gusev Crater and Meridiani Planum. A population of rocks on the Meridiani Planum outcrop was identified as iron and stony meteorites by the presence of Fe metal (kamacite) and the sulfide troilite. The MER mission demonstrates that Mössbauer spectrometers landed on any Fe-bearing planetary surface provide first-order information on igneous provinces, alteration state, and alteration style and provide wellconstrained criteria for sample selection on planetary sample-return missions including planets, moons, and asteroids.

show abstract

“…Numerous publications provide extensive reviews of Mössbauer spectroscopy (e.g., Wegener 1966; Gonser 1975; Gütlich et al. 1978; Hawthorne 1988) and its applications in mineralogy and geochemistry (e.g., Bancroft 1973; Hawthorne 1988; Mitra 1992; Burns 1993; McCammon 1995; Murad and Cashion 2004; Dyar et al. 2006).…”

Section: Methodsmentioning

confidence: 99%

“…Numerous publications provide extensive reviews of Mo¨ssbauer spectroscopy (e.g., Wegener 1966;Gonser 1975;Gu¨tlich et al 1978;Hawthorne 1988) and its applications in mineralogy and geochemistry (e.g., Bancroft 1973;Hawthorne 1988;Mitra 1992;Burns 1993;McCammon 1995;Murad and Cashion 2004;Dyar et al 2006). Briefly, the Mo¨ssbauer effect is the recoilless absorption and emission of c-rays by nuclei of certain isotopes bound in a solid.…”

Section: Mo¨ssbauer Data Analysis and Instrumentationmentioning

confidence: 99%

New insights into the mineralogy and weathering of the Meridiani Planum meteorite, Mars

Fleischer

Schröder

Klingelhöfer

et al. 2011

Meteorit & Planetary Scien

View full text Add to dashboard Cite

Abstract-Meridiani Planum is the first officially recognized meteorite find on the surface of Mars. It was discovered at and named after the landing site of the Mars Exploration Rover Opportunity. Based on its composition, it was classified as a IAB complex iron meteorite. Mo¨ssbauer spectra obtained by Opportunity are dominated by kamacite (a-Fe-Ni) and exhibit a small contribution of ferric oxide. Several small features in the spectra have been neglected to date. To shed more light on these features, five iron meteorite specimens were investigated as analogs to Meridiani Planum with a laboratory Mo¨ssbauer setup. Measurements were performed on (1) their metallic bulk, (2) troilite (FeS) inclusions, (3) cohenite ((Fe,Ni,Co) 3 C) and schreibersite ((Fe,Ni) 3 P), and (4) corroded rims. In addition to these room-temperature measurements, a specimen from the Mundrabilla IAB-ungrouped meteorite was measured at Mars-equivalent temperatures. Based on these measurements, the features in Meridiani Planum spectra can be explained with the presence of small amounts of schreibersite and ⁄ or cohenite and iron oxides. The iron oxides can be attributed to a previously reported coating on Meridiani Planum. Their presence indicates weathering through the interaction of the meteorite with small amounts of water.

show abstract

Mössbauer Spectroscopy of Minerals

Cited by 146 publications

References 82 publications

A Complex Assemblage of Crystal Habits of Pyrite in the Volcanic Hot Springs from Kamchatka, Russia: Implications for the Mineral Signature of Life on Mars

A Complex Assemblage of Crystal Habits of Pyrite in the Volcanic Hot Springs from Kamchatka, Russia: Implications for the Mineral Signature of Life on Mars

Mössbauer Spectroscopy at Gusev Crater and Meridiani Planum

New insights into the mineralogy and weathering of the Meridiani Planum meteorite, Mars

Contact Info

Product

Resources

About