Mineralogy and texture of Fe-Ni sulfides in CI1 chondrites: Clues to the extent of aqueous alteration on the CI1 parent body

Bullock, E. S.; Gounelle, M.; Лауретта, Д. С.; Grady, M. M.; Russell, S. S.

doi:10.1016/j.gca.2005.01.003

Cited by 75 publications

(110 citation statements)

References 32 publications

(68 reference statements)

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“…Carbonates, sulfates, and sulfides are secondary minerals which precipitated from aqueous fluids on the meteorite parent bodies (e.g., Bullock et al 2005;Endress & Bischoff 1996;Fredriksson & Kerridge 1988 The patterns obtained in this study are identical to those from previous studies. Acid non-resistant species (i.e., carbonates) release 53 Cr when dissolved.…”

Section: Cr Anomalies At the Mineral Scale Of Carbonaceous Chondritessupporting

confidence: 80%

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

Petitat

Birck

Luu

et al. 2011

ApJ

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Early solar materials bear a variety of isotopic anomalies that reflect compositional differences deriving from distinct stellar nucleosynthetic processes. As shown in previous studies, the stepwise dissolution with increasing acid strengths of bulk rock carbonaceous chondrites liberates Cr with both excesses and deficits in 53 Cr and 54 Cr relative to the terrestrial standard. The magnitude of the 54 Cr variations within a meteorite decreases in the sequence CI1 > CR2 > CM2 > CV3 > CO3 > CK4 and correlates with the degree of metamorphism of each carbonaceous chondrite class. This study shows that the Tagish Lake meteorite presents the highest excesses in 54 Cr ever measured in a bulk silicate phase. According to this study, the Tagish Lake meteorite is composed of the least re-equilibrated material known at this time. The magnitude of 54 Cr variation decreases now in the following sequence: Tagish Lake (ungrouped CI2) > Orgueil (CI1) > Murchison (CM2) > Allende (CV2). Moreover, this study shows that excesses in 53 Cr relative to Earth can be interpreted as representing the extent of aqueous alteration on meteorite parent bodies. Finally, the high 54 Cr anomalies measured in this meteorite make Tagish Lake one of the major targets to decipher the host of these anomalies.

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Section: Cr Anomalies At the Mineral Scale Of Carbonaceous Chondritessupporting

confidence: 80%

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

Petitat

Birck

Luu

et al. 2011

ApJ

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“…The few verified pentlandite crystals in Wild 2 tracks are intriguing since this phase is frequently an indicator of low-temperature metamorphism under oxidizing conditions, and/or aqueous alteration (Zolensky and Thomas 1995;Bullock et al 2005). So far we have not observed tochilinite, which is a hallmark of the hydrated CM2s and a few hydrous chondritic IDPs (Bradley and Brownlee 1991;.…”

Section: Fe-ni Sulfides In Wild 2 Grainsmentioning

confidence: 73%

Comparing Wild 2 particles to chondrites and IDPs

Zolensky

Nakamura‐Messenger

Rietmeijer

et al. 2008

Meteorit & Planetary Scien

146

143

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“…The similarity of the solar and CI elementabundance ratios are evidence that the extensive aqueous alteration experienced by these meteorites occurred in a closed system (Clayton and Mayeda 1984;Morlok et al 2006). Mineralogical and isotopic data are consistent with aqueous alteration between 50 °C and 100 °C (Bullock et al 2005;Leshin et al 1997). The Tagish Lake (C2 ungrouped) meteorite also contains a C-rich matrix of clays, carbonates, and sulfides together with olivine-rich aggregates and sparse chondrules (Bland et al 2004;Brown et al 2000).…”

Section: Introductionmentioning

confidence: 68%

Prebiotic carbon in clays from Orgueil and Ivuna (CI), and Tagish Lake (C2 ungrouped) meteorites

Garvie

Buseck

2007

Meteorit & Planetary Scien

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Abstract-Transmission electron microscopic (TEM) and electron energy-loss spectroscopic (EELS) study of the Ivuna and Orgueil (CI), and Tagish Lake (C2 ungrouped) carbonaceous chondrite meteorites shows two types of C-clay assemblages. The first is coarser-grained (to 1 2m) clay flakes that show an intense O K edge from the silicate together with a prominent C K edge, but without discrete C particles. Nitrogen is common in some clay flakes. Individual Orgueil and Tagish Lake meteorite clay flakes contain up to 6 and 8 at% C, respectively. The C K-edge spectra from the clays show fine structure revealing aromatic, aliphatic, carboxylic, and carbonate C. The EELS data shows that this C is intercalated with the clay flakes. The second C-clay association occurs as poorly crystalline to amorphous material occurring as nanometer aggregates of C, clay, and Fe-O-rich material. Some aggregates are dominated by carbonaceous particles that are structurally and chemically similar to the acid insoluble organic matter. The C K-edge shape from this C resembles that of amorphous C, but lacking the distinct peaks corresponding to aliphatic, carboxylic, and carbonate C groups. Nanodiamonds are locally abundant in some carbonaceous particles. The abundance of C in the clays suggest that molecular speciation in the carbonaceous chondrites is partly determined by the effects of aqueous processing on the meteorite parent bodies, and that clays played an important role. This intricate C-clay association lends credence to the proposal that minerals were important in the prebiotic chemical evolution of the early solar system.

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Mineralogy and texture of Fe-Ni sulfides in CI1 chondrites: Clues to the extent of aqueous alteration on the CI1 parent body

Cited by 75 publications

References 32 publications

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

The Chromium Isotopic Composition of the Ungrouped Carbonaceous Chondrite Tagish Lake

Comparing Wild 2 particles to chondrites and IDPs

Prebiotic carbon in clays from Orgueil and Ivuna (CI), and Tagish Lake (C2 ungrouped) meteorites

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