The chemical composition of carbonaceous chondrites: Implications for volatile element depletion, complementarity and alteration

Variations of Chemical Composition of Matrices of Carbonaceous Chondrites

MATRICES OF CARBONACEOUS CHONDRITES. K. Abe, N. Sakamoto, H. Kojima, A. N. Krot and H. Yurimoto. Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, JAPAN. E-mail: [email protected]. hokudai.ac.jp, Isotope Imaging Laboratory, Creative Research Institution Sousei, Hokkaido University, Sapporo, 001-0021, JAPAN, Antarctic Meteorite Research Center, National Institute of Pola...

Carbonaceous chondrites as analogs for the composition and alteration of Ceres

The mineralogy and geochemistry of Ceres, as constrained by Dawn’s instruments, are broadly consistent with a carbonaceous chondrite (CM/CI) bulk composition. Differences explainable by Ceres’s more advanced alteration include the formation of Mgrich serpentine and ammoniated clay; a greater proportion of carbonate and lesser organic matter; amounts of magnetite, sulfide, and carbon that could ...

Aqueous Alteration of Carbonaceous Chondrites: Evidence for Asteroidal

Modeling Aqueous Alteration of Cm Carbonaceous Chondrites: Implications for Cronstedtite Formation by Water-rock Reaction

Introduction: CM carbonaceous chondrites display a wide range of aqueous alteration products that occurred by low temperature water-rock reactions on their parent bodies [1,2]. Previous modeling studies have verified that these reactions occurred at low temperatures (0-50C), for they reproduced many of the observed mineral assemblages [3]. The dominant phases are tochilinite and Mg-Fe phyllosil...

Volatile fractionation in the early solar system and chondrule/matrix complementarity.

Bulk chondritic meteorites and terrestrial planets show a monotonic depletion in moderately volatile and volatile elements relative to the Sun's photosphere and CI carbonaceous chondrites. Although volatile depletion was the most fundamental chemical process affecting the inner solar nebula, debate continues as to its cause. Carbonaceous chondrites are the most primitive rocks available to us, ...