Paris vs. Murchison: Impact of hydrothermal alteration on organic matter in CM chondrites

Vinogradoff, Vassilissa; Guillou, C. Le; Bernard, Sylvain; Binet, Laurent; Cartigny, Pierre; Brearley, A. J.; Rémusat, Laurent

doi:10.1016/j.gca.2017.06.009

Cited by 74 publications

(130 citation statements)

References 122 publications

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…In addition, we observe an increase in the C/N ratio with progressive alteration, suggesting loss of N. The C-K edge structures of Bells are very similar to those of Jbilet Winselwan mx2, albeit with a relatively higher peak at 286.5 eV, suggesting that Bells has experienced a higher degree of alteration. Our results are in agreement with Vinogradoff et al (2017), who observe an increase of ketone and carboxyl functional groups between Paris and Murchison. They suggest, however, a higher initial aliphatic/aromatic ratio for Paris IOM and increasing aromatization during aqueous alteration.…”

Section: Progressive Aqueous Alterationsupporting

confidence: 93%

“…Comparing results from pyrolysis GC-MS between Paris and Murchison, however, indicates that Paris has a higher relative abundance of aromatics than suggested from NMR spectroscopy. Vinogradoff et al (2017) also observe an increase in aromatic carbon (>50%), ketones, carboxyls and carbonyls (together 15% of the total carbon) for Murchison relative to Paris.…”

Section: Structural Changes In Organic Matter During Aqueous and Thermentioning

confidence: 71%

“…Nitrogen isotope signatures for IOM of the same meteorites have a similar range, between À10 and +10‰ (Alexander et al, 2007). Recently, the least altered CM chondrite Paris was found to have a bulk d 15 N value of +19.5‰ (Vinogradoff et al, 2017), on the upper end of CM chondrite values. Bells, often described as an anomalous CM chondrite (Kallemeyn, 1995;Mittlefehldt, 2002) .…”

Section: Bellsmentioning

confidence: 90%

“…It is important to characterize these changes to understand the formation of prebiotic molecules from the molecular cloud and protoplanetary disk stage to their incorporation in meteorites. While organic matter in the CM2.5 chondrite Murchison is studied extensively (Cronin and Chang, 1993;Cody and Alexander, 2005;Pizzarello et al, 2006;Derenne and Robert, 2010;LeGuillou et al, 2014), only recently a comparison was made between this chondrite and the weakly altered CM2.8 Paris (Vinogradoff et al, 2017). Collectively, these results suggest that hydrothermal alteration on the CM parent body induced aromatization and oxidation of the IOM.…”

Section: Introductionmentioning

confidence: 89%

“…The degree of alteration in Maribo is likely similar to Paris, considering its bulk oxygen isotope and PCP composition (Haack et al, 2012), the abundant small metal grains surviving in the matrix, the presence of amorphous and anhydrous silicates and the ubiquitous fine-grained TCI structures. The organic structure of Paris IOM has been determined using multiple techniques, including 13 C nuclear magnetic resonance (NMR) spectroscopy, C-XANES and pyrolysis gas chromatography mass spectroscopy (GC-MS) (Vinogradoff et al, 2017). These techniques involve analyses of separated IOM by crushing multiple grams of the Paris meteorite, thereby including fresh and altered regions.…”

Section: Structural Changes In Organic Matter During Aqueous and Thermentioning

confidence: 99%

See 4 more Smart Citations

Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites

Kooten

Nagashima

Kasama

et al. 2018

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

The recent fall of the relatively unaltered CM chondrite Maribo provides a unique opportunity to study the early stages of aqueous alteration on the CM chondrite parent body. We show using transmission electron microscopy of a matrix FIBsection from Maribo that this meteorite mainly appears to consist of tochilinite-cronstedtite intergrowths (TCIs), but also contains regions of amorphous or nanocrystalline silicates, anhydrous silicates and FeNi metal aggregates with thin iron oxide rims, suggesting that it experienced aqueous alteration to a relatively small degree. A comparison of Maribo with increasingly altered CM chondrites such as Jbilet Winselwan and Bells shows that during progressive aqueous alteration (1) the TCIs are replaced by coarser sulfides and increasingly Mg-rich serpentine, and (2) the abundance of 15 N-rich hotspots increases, whereas the magnitude of their 15 N enrichment decreases. We observe that the overall N isotope variability related to aqueous alteration is an order of magnitude lower than the variability observed between different chondrite groups. We suggest these high order differences are the result of heterogeneous accretion of insoluble or soluble organic carriers of 15 N to the different chondrite parent bodies. D/H ratios of matrices from Maribo, Jbilet Winselwan and Bells increase with progressive aqueous alteration, a trend that is opposite to expectations of mixing between D-poor water and D-rich organic matter. We argue that this behaviour cannot be related to Fe oxidation or serpentinization reactions and subsequent loss of D-poor H 2 gas. We offer an alternative hypothesis and suggest that CM chondrites experienced two-stage aqueous alteration. During the first stage occurring at relatively low temperature, mixing of increasing amounts of D-poor water with D-rich organic matter results in a decrease of D/H ratio with increasing degree of alteration. During the second stage of alteration occurring at relatively high temperature (T < 300°C), decomposition of TCIs in CMs of petrologic type <2.7 releases gaseous D-poor water that results in increase of the D/H ratio of the CM matrices. Finally, we report on changes in the organic structure of Maribo, Jbilet Winselwan and Bells using Carbon-K and Nitrogen-K edge electron energy loss spectroscopy. The organic matter initially has higher aromatic/aliphatic ratios (e.g., Maribo) and lower abundances of ketone and carboxyl functional groups, which we suggest are the result of chemical degradation of double bonded carbon from oxidation during hydrothermal

show abstract

Section: Progressive Aqueous Alterationsupporting

confidence: 93%

Section: Structural Changes In Organic Matter During Aqueous and Thermentioning

confidence: 71%

Section: Bellsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 89%

Section: Structural Changes In Organic Matter During Aqueous and Thermentioning

confidence: 99%

See 3 more Smart Citations

Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites

Kooten

Nagashima

Kasama

et al. 2018

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

show abstract

Organic Matter in the Solar System—Implications for Future on-Site and Sample Return Missions

et al. 2020

View full text Add to dashboard Cite

Solar system bodies like comets, asteroids, meteorites and dust particles contain organic matter with different abundances, structures and chemical composition. This chapter compares the similarities and differences of the organic composition in these planetary bodies. Furthermore, these links are explored in the context of detecting the most pristine organic material, either by on-site analysis or sample return missions. Finally, we discuss the targets of potential future sample return missions, as well as the contamination controls that should be in place in order to successfully study pristine organic matter.

show abstract

Relict Ocean Worlds: Ceres

et al. 2020

View full text Add to dashboard Cite

Paris vs. Murchison: Impact of hydrothermal alteration on organic matter in CM chondrites

Cited by 74 publications

References 122 publications

Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites

Isotope record of mineralogical changes in a spectrum of aqueously altered CM chondrites

Organic Matter in the Solar System—Implications for Future on-Site and Sample Return Missions

Relict Ocean Worlds: Ceres

Contact Info

Product

Resources

About