Sulfur in apatite from the Nakhla meteorite record a late-stage oxidation event

Brounce, Maryjo; Boyce, J. W.; McCubbin, F. M.

doi:10.1016/j.epsl.2022.117784

Cited by 13 publications

(12 citation statements)

References 46 publications

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“…Halogens range from 0.2 to 1.9 wt% for F, with a mean of 0.95 wt% F, and from 2.9 to 5.5 wt% Cl, with a mean of 4.02 wt% Cl (Table 3). This is broadly consistent with previous reports of apatite compositions in Nakhla (e.g., McCubbin et al, 2013;Brounce et al, 2022;Figs. 4, 9).…”

Section: Apatite S/tem-eds Compositionssupporting

confidence: 93%

“…10), the overall positive correlation indicates that some silica could be bonded in the apatite structure. However, given that (1) substitution in apatite involving Si for P include REE for Ca (Pan and Fleet, 2002), and (2) REEs are below detection limits in all the analyses (Table 2), we conclude that Si is most likely hosted in another phase (e.g., ellestadite, Brounce et al, 2022).…”

Section: Apatite S/tem-eds Compositionsmentioning

confidence: 79%

“…Apatite textures and compositions in the nakhlites have been used to reconstruct their magmatic and subsolidus histories and to better understand volatile reservoirs, their interactions, and their behavior in the martian crust and mantle (e.g., McCubbin et al, 2013;Brounce et al, 2022). However, it is clear from our observations that apatite grains in the nakhlites reflect a complex record of both magmatic and subsolidus processes and that extracting petrogenetic and volatile records are difficult and fraught with interpretive issues.…”

Section: Discussionmentioning

confidence: 91%

“…There has been reported evidence that suggests that the nakhlite magma body experienced at least two interactions with hydrothermal fluids (Gooding et al, 1991). One fluid/rock interaction occurred with a magmatic hydrothermal fluid exsolved from the nakhlite magma body during cooling once the magma reached chloride saturation (McCubbin et al, 2013;Brounce et al, 2022), and the second involved a later, shallower, aqueous brine resulting from an impact adjacent to the nakhlite parent rocks that formed secondary, low-temperature minerals (Ashworth and Hutchison, 1975;Newsom, 1980;Gooding et al, 1991;Abramov and Kring, 2005;Changela and Bridges, 2010;Bridges and Schwenzer, 2012;Hicks et al, 2014;Lee et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…In contrast to NWA 998, 3b,d). Compositionally, apatite grains in Nakhla have highly variable Cl/F ratios (from 1.55 to 27.5, Table 3), from very Cl-rich to very F-rich, with a missing component abundance ranging from 0 to 14 mol% (McCubbin et al, 2013;Brounce et al, 2022) (Fig. 4).…”

Section: General Petrographic Characteristics Of Nakhla Apatitesmentioning

confidence: 99%

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Nanostructural domains in martian apatites that record primary subsolidus exsolution of halogens: Insights into nakhlite petrogenesis

Martínez,

Shearer,

Brearley

2023

American Mineralogist

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The microstructures of selected F-, Cl-, OH-bearing martian apatite grains, two in Northwest Africa (NWA) 998 (cumulus apatites, embedded in pyroxene) and a set of four in Nakhla This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Apatite S/tem-eds Compositionssupporting

confidence: 93%

Section: Apatite S/tem-eds Compositionsmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: General Petrographic Characteristics Of Nakhla Apatitesmentioning

confidence: 99%

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Nanostructural domains in martian apatites that record primary subsolidus exsolution of halogens: Insights into nakhlite petrogenesis

Martínez,

Shearer,

Brearley

2023

American Mineralogist

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Sulfur oxidation state and solubility in silicate melts

Boulliung

Wood

2023

Contrib Mineral Petrol

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We have determined the solubility of sulfur (S) as sulfide (S2–) for 13 different natural melt compositions at temperatures of 1473–1773 K under controlled conditions of oxygen and sulfur fugacities (fO2 and fS2, respectively). The S and major element contents of the quenched glasses were determined by electron microprobe. The sulfide capacity parameter (CS2–) was used to express S2– solubility as a function of the oxygen and sulfur fugacities according to the equation: $$\log C_{{S^{2 - } }} = \log S_{melt} \left( {wt\% } \right) + 0.5\log \left( {\frac{{fO_{2} }}{{fS_{2} }}} \right)$$ log C S 2 - = log S melt w t % + 0.5 log f O 2 f S 2 . Sulfide capacities of silicate melts were found to increase with temperature and the FeO content of the melt. We combined our sulfide data at 1473–1773 K with (O’Neill and Mavrogenes, J Petrol 43:1049–1087, 2002) results at 1673 K, and obtained by stepwise linear regression the following equation for sulfide capacity $$\log C_{{S^{2 - } }} = 0.225 + \left( {25237X_{FeO} + 5214X_{CaO} + 12705X_{MnO} + 19829X_{{K_{2} O}} - 1109X_{{Si_{0.5} O}} - 8879} \right)/T{ }$$ log C S 2 - = 0.225 + 25237 X FeO + 5214 X CaO + 12705 X MnO + 19829 X K 2 O - 1109 X S i 0.5 O - 8879 / T . XMO is the mole fraction of the oxide of M on a single-oxygen basis, and T is in Kelvin. The sulfide capacity equation was combined with sulfate capacity (CS6+) data for similar compositions and at the same temperatures (Boulliung and Wood, Geochim Cosmochim Acta 336:150–164, 2022), to estimate the S redox state (S6+/S2– ratio) as a function of melt composition, temperature and oxygen fugacity. Results obtained are in good agreement with earlier measurements of S6+/S2– for basaltic and andesitic compositions. We observe a significant increase, however, relative to FMQ of the oxygen fugacity of the S2– to S6+ transition as temperature is lowered from 1773 to 1473 K. We used our results to simulate sulfur-degassing paths for basaltic compositions under various redox conditions (FMQ –2 log fO2 units to FMQ + 2). The calculations indicate that, given an initial concentration of 0.12 wt% S in an ascending melt at 250 MPa, most of the S (> 80%) will be degassed before the magma reaches 100 MPa pressure.

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Mantle redox

Aulbach,

Brounce

2025

Treatise on Geochemistry

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Sulfur in apatite from the Nakhla meteorite record a late-stage oxidation event

Cited by 13 publications

References 46 publications

Nanostructural domains in martian apatites that record primary subsolidus exsolution of halogens: Insights into nakhlite petrogenesis

Nanostructural domains in martian apatites that record primary subsolidus exsolution of halogens: Insights into nakhlite petrogenesis

Sulfur oxidation state and solubility in silicate melts

Mantle redox

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