Water Reservoirs in Small Planetary Bodies: Meteorites, Asteroids, and Comets

Alexander, Conel M. O'd.; McKeegan, Kevin D.; Altwegg, Kathrin

doi:10.1007/978-94-024-1628-2_3

Cited by 14 publications

(24 citation statements)

References 272 publications

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“…Nevertheless, our data for C and N concentrations (Fig. 3) are consistent with a matrix content dependency for these elements (Alexander et al, 2018b). Furthermore, correcting for terrestrial water contamination in CIs largely affects their D/H isotopic compositions, which is not the case for CMs (Fig.…”

Section: Implication For the Origin And Abundance Of H In Chondritessupporting

confidence: 83%

“…CV chondrites comprising 40 vol.% matrix have H abundances roughly one tenth those of CM and CI chondrites. Together, our results for CV-, CM-, and CI-type carbonaceous chondrites argue against the suggested dependency of the bulk H concentration on matrix content (Alexander et al, 2018b). Nevertheless, our data for C and N concentrations (Fig.…”

Section: Implication For the Origin And Abundance Of H In Chondritescontrasting

confidence: 61%

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Hydrogen in chondrites: Influence of parent body alteration and atmospheric contamination on primordial components

Vacher

Piani

Rigaudier

et al. 2020

Geochimica et Cosmochimica Acta

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Hydrogen occurs at the near percent level in the most hydrated chondrites (CI and CM) attesting to the presence of water in the asteroid-forming regions. Their H abundances and isotopic signatures are powerful proxies for deciphering the distribution of H in the protoplanetary disk and the origin of Earth's water. Here, we report H contents and isotopic compositions for a set of carbonaceous and ordinary chondrites, including previously analyzed and new samples analyzed after the powdered samples were degassed under vacuum at 120°C for 48 hours to remove adsorbed atmospheric water. By comparing our results to literature data, we reveal that the H budgets of both H-poor and H-rich carbonaceous chondrites are largely affected by atmospheric moisture, and that their precise quantification requires a specific pre-degassing procedure to correct for terrestrial contamination. Our results show that indigenous H contents of CI carbonaceous chondrites usually considered the more hydrated meteorites are almost a factor of 2 lower than those previously reported, with uncontaminated D/H ratios differing significantly from that of Earth's oceans. Without pre-degassing, the H concentrations of H-poor samples (e.g., CVs chondrites) are also affected by terrestrial contamination. After correction for contamination, it appears that the amount of water in chondrites is not controlled by the matrix modal abundance, suggesting that the different chondritic parent bodies accreted variable amounts of water-ice grains. Our results also imply that (i) thermal metamorphism play an important role in determining the H content of both CV and ordinary chondrites but without affecting drastically their H isotopic composition since no clear D enrichment is observed with the increase of petrographic type and (ii) the D enrichment of ordinary chondrites does not result from the loss of isotopically light H 2 induced by metal oxidation but is rather linked to the persistence of a thermally resistant D-rich component.

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Section: Implication For the Origin And Abundance Of H In Chondritessupporting

confidence: 83%

Section: Implication For the Origin And Abundance Of H In Chondritescontrasting

confidence: 61%

Hydrogen in chondrites: Influence of parent body alteration and atmospheric contamination on primordial components

Vacher

Piani

Rigaudier

et al. 2020

Geochimica et Cosmochimica Acta

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“…The CLS's coolant is asteroid water. This is feasible as meteorites and asteroids host water reservoirs [46][47]. Relation between the CLS, SCS, CCS and the earth segment is in Figure 2.…”

Section: Shdc Network Architecturementioning

confidence: 99%

Space Habitat Data Centers – For Future Computing

Periola¹,

Alonge²,

Ogudo³

2020

Preprint

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Data from sensor bearing satellites requires processing aboard terrestrial data centers that use water for cooling at the expense of high data transfer latency. The reliance of terrestrial data centers on water increases their water footprint and limits the availability of water for other applications. Therefore, data centers with low data transfer latency and reduced reliance on earth’s water resources are required. This paper proposes space habitat data centers (SHDCs) with low latency data transfer and that use asteroid water to address these challenges. The paper investigates the feasibility of accessing asteroid water and the reduction in computing platform access latency. Results show that the mean asteroid water access period is 319.39 days. The use of SHDCs instead of non-space computing platforms reduces access latency and increases accessible computing resources by (11.9% – 33.6%) and (46.7% – 77%) on average respectively.

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“…For instance, Antarctic and Saharan samples are commonly affected by Na loss and/or metal alteration, and Antarctic samples by oxygen isotopic exchange with Antarctic water (Alexander et al. 2018). Thus, as meteorite falls are collected before any significant terrestrial alteration can occur, they are of primary importance for deciphering the formation of the solar system.…”

Section: Introductionmentioning

confidence: 99%

The Piancaldoli meteorite: A forgotten primitive LL3.10 ordinary chondrite

Marrocchi

Bonal

Gattacceca

et al. 2020

Meteorit & Planetary Scien

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The Piancaldoli ordinary chondrite fell in northern Italy on August 10, 1968. Preliminary studies led to its classification as an LL3.4 unequilibrated ordinary chondrite. However, recent developments in classification procedures have prompted us to reexamine its mineralogical, petrographic, spectroscopic, chemical, and isotopic features in a multitechnique study. Raman spectra and magnetic properties indicate that Piancaldoli experienced minimal thermal metamorphism, consistent with its high bulk hydrogen content and the Cr contents of ferroan olivines in its type II chondrules. In combination with findings of previous studies, our data thus confirm the variability of Cr contents in ferroan olivines in type II chondrules as a proxy of thermal metamorphism. Furthermore, our results reveal that Piancaldoli is less altered than previously reported and should be reclassified as an LL3.10 unequilibrated ordinary chondrite. Our results also imply that the bulk deuterium enrichment, as observed in Piancaldoli (LL3.10), Bishunpur (LL3.15), and Semarkona (LL3.00), is a specific signature of the most primitive unequilibrated ordinary chondrites. Based on our results, we propose that, to date, Piancaldoli is the second leastaltered unequilibrated ordinary chondrite fall after Semarkona. This work reiterates the importance of meteorite collections worldwide as fundamental resources for studying the formation conditions and evolution of our solar system.

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Water Reservoirs in Small Planetary Bodies: Meteorites, Asteroids, and Comets

Cited by 14 publications

References 272 publications

Hydrogen in chondrites: Influence of parent body alteration and atmospheric contamination on primordial components

Hydrogen in chondrites: Influence of parent body alteration and atmospheric contamination on primordial components

Space Habitat Data Centers – For Future Computing

The Piancaldoli meteorite: A forgotten primitive LL3.10 ordinary chondrite

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