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Spectral characteristics of iron‐bearing phyllosilicates: Comparison to Orgueil (CI1), Murchison and Murray (CM2)
Author(s) -
CALVIN WENDY M.,
KING TRUDE V. V.
Publication year - 1997
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.1997.tb01554.x
Subject(s) - chondrite , murchison meteorite , geology , spectral line , mineralogy , meteorite , mineral , reflectivity , geochemistry , astrobiology , analytical chemistry (journal) , chemistry , physics , environmental chemistry , optics , astronomy , organic chemistry
— Phyllosilicate alteration minerals are commonly found in low petrologic types of carbonaceous chondrites. Previous spectral studies have examined Mg‐bearing phyllosilicates with limited success in matching the spectral properties of CM and CI chondrites. Transmission electron microscope and other analytical techniques suggest that Fe‐bearing clays are more abundant in CI and CM chondrites than magnesian varieties. Here, we present the results of an examination of the reflectance spectra of Fe‐phyllosilicates, including serpentines and berthierines, of which the latter were formerly known as septechlorites. We have measured the diffuse reflectance spectra of powdered samples from 0.3 to 25 μn. We find that these minerals provide a better spectral match to many of the features seen in CI and CM chondrites, and simple linear combinations of the spectra of both Fe‐ and Mg‐phyllosilicates closely approximate the spectra of CM and CI chondrites.