Evidence for oxidation at the base of the nakhlite pile by reduction of sulfate salts at the time of lava emplacement

Dottin, James W.; Labidi, Jabrane; Farquhar, James; Piccoli, Philip M.; Liu, Ming‐Chang; McKeegan, Kevin D.

doi:10.1016/j.gca.2018.07.029

Cited by 12 publications

(24 citation statements)

References 36 publications

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“…The mean Fe/S ratio of CeC 022 pyrrhotite (Fe 0.89 S; hexagonal pyrrhotite) ( Fig. S2), coupled with textural evidence of magnetite, indicates similar oxidizing crystallization conditions near the FMQ synthetic buffer (Chevrier et al 2011), as usually reported for nakhlite pyrrhotites that inherited abundant crustal sulfur in their S isotopic composition (Farquhar et al 2007;Franz et al 2014;Dottin et al 2018).…”

Section: Sulfidessupporting

confidence: 69%

“…Similarly, the high sulfide content, coupled with Ni-free pyrrhotite compositions in CeC 022, also resembles MIL's nakhlites (Day et al 2006;Franz et al 2014;Dottin et al 2018). Assimilation of crustal sulfur during the igneous crystallization stage could account for CeC 022 pyrrhotite modal abundance and Ni-poor composition, as repeatedly documented in nakhlites, especially in the fast-cooled subgroup (Farquhar et al 2007;Franz et al 2014Franz et al , 2019Dottin et al 2018;Mari et al [2019] and reference therein). The mean Fe/S ratio of CeC 022 pyrrhotite (Fe 0.89 S; hexagonal pyrrhotite) ( Fig.…”

Section: Sulfidessupporting

confidence: 52%

“…Caleta el Cobre 022 is sulfide-rich (0.15 AE 0.05 vol%) compared to other nakhlites so far studied for sulfides (Chevrier et al 2011;Franz et al 2014;Dottin et al 2018;Mari et al 2019).…”

Section: Sulfidesmentioning

confidence: 92%

Section: Sulfidesmentioning

confidence: 99%

“…The sulfide droplets inside skeletal mesostasis minerals coupled with Ni-free pyrrhotite were described in faster cooled nakhlites as NWA 817 (Chevrier et al 2011) and MIL's nakhlites (Day et al 2006;Dottin et al 2018). Similarly, the high sulfide content, coupled with Ni-free pyrrhotite compositions in CeC 022, also resembles MIL's nakhlites (Day et al 2006;Franz et al 2014;Dottin et al 2018). Assimilation of crustal sulfur during the igneous crystallization stage could account for CeC 022 pyrrhotite modal abundance and Ni-poor composition, as repeatedly documented in nakhlites, especially in the fast-cooled subgroup (Farquhar et al 2007;Franz et al 2014Franz et al , 2019Dottin et al 2018;Mari et al [2019] and reference therein).…”

Section: Sulfidesmentioning

confidence: 99%

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Caleta el Cobre 022 Martian meteorite: Increasing nakhlite diversity

Ruggiu

Gattacceca

Devouard

et al. 2020

Meteorit & Planetary Scien

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Caleta el Cobre (CeC) 022 is a Martian meteorite of the nakhlite group, showing an unbrecciated cumulate texture, composed mainly of clinopyroxene and olivine. Augite shows irregular core zoning, euhedral rims, and thin overgrowths enriched in Fe relative to the core. Low‐Ca pyroxene is found adjacent to olivine. Phenocrysts of Fe‐Ti oxides are titanomagnetite with exsolutions of ilmenite/ulvöspinel. Intercumulus material consists of both coarse plagioclase and fine‐grained mesostasis, comprising K‐feldspars, pyroxene, apatite, ilmenite, Fe‐Ti oxides, and silica. CeC 022 shows a high proportion of Martian aqueous alteration products (iddingsite) in olivine (45.1 vol% of olivine) and mesostasis. This meteorite is the youngest nakhlite with a distinct Sm/Nd crystallization age of 1.215 ± 0.067 Ga. Its ejection age of 11.8 ± 1.8 Ma is similar to other nakhlites. CeC 022 reveals contrasted cooling rates with similarities with faster cooled nakhlites, such as Northwest Africa (NWA) 817, NWA 5790, or Miller Range 03346 nakhlites: augite irregular cores, Fe‐rich overgrowths, fine‐grained K‐feldspars, quenched oxides, and high rare earth element content. CeC 022 also shares similarities with slower cooled nakhlites, including Nakhla and NWA 10153: pyroxene modal abundance, pyroxenes crystal size distribution, average pyroxene size, phenocryst mineral compositions, unzoned olivine, and abundant coarse plagioclase. Moreover, CeC 022 is the most magnetic nakhlite and represents an analog source lithology for the strong magnetization of the Martian crust. With its particular features, CeC 022 must originate from a previously unsampled sill or flow in the same volcanic system as the other nakhlites, increasing Martian sample diversity and our knowledge of nakhlites.

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Section: Sulfidessupporting

confidence: 69%

Section: Sulfidessupporting

confidence: 52%

“…Caleta el Cobre 022 is sulfide-rich (0.15 AE 0.05 vol%) compared to other nakhlites so far studied for sulfides (Chevrier et al 2011;Franz et al 2014;Dottin et al 2018;Mari et al 2019).…”

Section: Sulfidesmentioning

confidence: 92%

Section: Sulfidesmentioning

confidence: 99%

Section: Sulfidesmentioning

confidence: 99%

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Caleta el Cobre 022 Martian meteorite: Increasing nakhlite diversity

Ruggiu

Gattacceca

Devouard

et al. 2020

Meteorit & Planetary Scien

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Noble Gases and Stable Isotopes Track the Origin and Early Evolution of the Venus Atmosphere

et al. 2022

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The composition the atmosphere of Venus results from the integration of many processes entering into play over the entire geological history of the planet. Determining the elemental abundances and isotopic ratios of noble gases (He, Ne, Ar, Kr, Xe) and stable isotopes (H, C, N, O, S) in the Venus atmosphere is a high priority scientific target since it could open a window on the origin and early evolution of the entire planet. This chapter provides an overview of the existing dataset on noble gases and stable isotopes in the Venus atmosphere. The current state of knowledge on the origin and early and long-term evolution of the Venus atmosphere deduced from this dataset is summarized. A list of persistent and new unsolved scientific questions stemming from recent studies of planetary atmospheres (Venus, Earth and Mars) are described. Important mission requirements pertaining to the measurement of volatile elements in the atmosphere of Venus as well as potential technical difficulties are outlined.

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