The nature, origin and modification of insoluble organic matter in chondrites, the major source of Earth's C and N

CMOD Alexander, GD Cody, BT De Gregorio, LR Nittler… - Geochemistry, 2017 - Elsevier
All chondrites accreted∼ 3.5 wt.% C in their matrices, the bulk of which was in a
macromolecular solvent and acid insoluble organic material (IOM). Similar material to IOM is …

Low-temperature aqueous alteration of chondrites

MR Lee, CMOD Alexander, A Bischoff… - Space Science …, 2025 - Springer
Chondritic meteorites (chondrites) contain evidence for the interaction of liquid water with
the interiors of small bodies early in Solar System history. Here we review the processes …

Classification of hydrous meteorites (CR, CM and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetesimal environments

KT Howard, CMOD Alexander, DL Schrader… - … et Cosmochimica Acta, 2015 - Elsevier
The relative differences in the degree of hydration should be reflected in any classification
scheme for aqueously altered meteorites. Here we report the bulk mineralogies and degree …

Hf-W chronology of CR chondrites: Implications for the timescales of chondrule formation and the distribution of 26Al in the solar nebula

G Budde, TS Kruijer, T Kleine - Geochimica et Cosmochimica Acta, 2018 - Elsevier
Renazzo-type carbonaceous (CR) chondrites are distinct from most other chondrites in
having younger chondrule 26 Al-26 Mg ages, but the significance of these ages and whether …

Distribution of 26Al in the CR chondrite chondrule-forming region of the protoplanetary disk

DL Schrader, K Nagashima, AN Krot, RC Ogliore… - … et Cosmochimica Acta, 2017 - Elsevier
We report on the mineralogy, petrography, and in situ measured oxygen-and magnesium-
isotope compositions of eight porphyritic chondrules (seven FeO-poor and one FeO-rich) …

Carbonate abundances and isotopic compositions in chondrites

CMOD Alexander, R Bowden, ML Fogel… - … & Planetary Science, 2015 - Wiley Online Library
We report the bulk C abundances, and C and O isotopic compositions of carbonates in 64
CM chondrites, 14 CR chondrites, 2 CI chondrites, LEW 85332 (C2), Kaba (CV 3), and …

The Fe/S ratio of pyrrhotite group sulfides in chondrites: An indicator of oxidation and implications for return samples from asteroids Ryugu and Bennu

DL Schrader, J Davidson, TJ McCoy, TJ Zega… - … et Cosmochimica Acta, 2021 - Elsevier
Determining compositional trends among individual minerals is key to understanding the
thermodynamic conditions under which they formed and altered, and is also essential to …

Origin of volatile element depletion among carbonaceous chondrites

JL Hellmann, T Hopp, C Burkhardt, T Kleine - Earth and Planetary Science …, 2020 - Elsevier
Compared to the composition of CI chondrites and the Sun, all other carbonaceous
chondrites are variably depleted in volatile elements. However, the origin of these …

Deoxyribose and deoxysugar derivatives from photoprocessed astrophysical ice analogues and comparison to meteorites

M Nuevo, G Cooper, SA Sandford - Nature communications, 2018 - nature.com
Sugars and their derivatives are essential to all terrestrial life. Their presence in meteorites,
together with amino acids, nucleobases, amphiphiles, and other compounds of biological …

The formation and alteration of the Renazzo‐like carbonaceous chondrites III: Toward understanding the genesis of ferromagnesian chondrules

DL Schrader, HC Connolly Jr… - … & Planetary Science, 2015 - Wiley Online Library
To better understand the formation conditions of ferromagnesian chondrules from the
Renazzo‐like carbonaceous (CR) chondrites, a systematic study of 210 chondrules from 15 …