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- W2277582273 abstract "CM chondrites are highly hydratedmeteorites associated with a parent asteroid that hasexperienced significant aqueous processing. The meteoriticevidence indicates that these non-differentiatedasteroids are formed by fine-grained minerals embeddedin a nanometric matrix that preserves chemicalclues of the forming environment. So far there are twohypothesis to explain the presence of hydrated mineralsin the content of CM chondrites: one is based on texturalfeatures in chondrule-rim boundaries [1-3], andthe other ‘preaccretionary’ hypothesis proposes theincorporation of hydrated phases from the protoplanetarydisk [4-6]. The highly porous structure of thesechondrites is inherited from the diverse materials presentin the protoplanetary disk environment. Thesebodies were presumably formed by low relative velocityencounters that led to the accretion of silicate-richchondrules, refractory Ca- and Al-rich inclusions(CAIs), metal grains, and the fine-grained materialsforming the matrix. Owing to the presence of significantterrestrial water in meteorite finds [7], here wehave focused on two CM chondrite falls with minimalterrestrial processing: Murchison and Cold Bokkeveld.Anhydrous carbonaceous chondrite matrices are usuallyrepresented by highly chemically unequilibratedsamples that contain distinguishable stellar grains.Other chondrites have experienced hydration andchemical homogeneization that reveal parent bodyprocesses. We have studied CM chondrites becausethese meteorites have experienced variable hydrationlevels [8-10]. It is important to study the textural effectsof aqueous alteration in the main minerals todecipher which steps and environments promote bulkchemistry changes, and create the distinctive alterationproducts. It is thought that aqueous alteration has particularlyplayed a key role in modifying primordialbulk chemistry, and homogenizing the isotopic contentof fine-grained matrix materials [7, 11, 12]. Fortunately,the mineralogy produced by parent-body and terrestrialaqueous alteration processes is distinctive [5, 11]." @default.
- W2277582273 created "2016-06-24" @default.
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- W2277582273 date "2015-03-01" @default.
- W2277582273 modified "2023-09-25" @default.
- W2277582273 title "Ultra High Resolution Transmission Electron Microscopy of Matrix Mineral Grains in CM Chondrites: Preaccretionary or Parent Body Aqueous Processing?" @default.
- W2277582273 hasPublicationYear "2015" @default.
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