Nature and degree of aqueous alteration in CM and CI carbonaceous chondrites

  title={Nature and degree of aqueous alteration in CM and CI carbonaceous chondrites},
  author={Driss Takir and Joshua P. Emery and Harry Y. McSween and Charles A. Hibbitts and Roger N. Clark and Neil C. Pearson and Alian Wang},
  journal={Meteoritics \& Planetary Science},
We investigated the petrologic, geochemical, and spectral parameters that relate to the type and degree of aqueous alteration in nine CM chondrites and one CI (Ivuna) carbonaceous chondrite. Our underlying hypothesis is that the position and shape of the 3 μm band is diagnostic of phyllosilicate mineralogy. We measured reflectance spectra of the chondrites under dry conditions (elevated temperatures) and vacuum (10−8 to 10−7 torr) to minimize adsorbed water and mimic the space environment, for… 
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