SPECTRAL CHARACTERISTICS OF IRON-BEARING PHYLLOSILICATES - COMPARISONTO ORGUEIL (CI1), MURCHISON AND MURRAY (CM2)

Citation
Wm. Calvin et Tvv. King, SPECTRAL CHARACTERISTICS OF IRON-BEARING PHYLLOSILICATES - COMPARISONTO ORGUEIL (CI1), MURCHISON AND MURRAY (CM2), Meteoritics & planetary science, 32(5), 1997, pp. 693-701
Citations number
44
Categorie Soggetti
Geochemitry & Geophysics
ISSN journal
10869379
Volume
32
Issue
5
Year of publication
1997
Pages
693 - 701
Database
ISI
SICI code
1086-9379(1997)32:5<693:SCOIP->2.0.ZU;2-J
Abstract
Phyllosilicate alteration minerals are commonly found in low petrologi c types of carbonaceous chondrites. Previous spectral studies have exa mined Mg-bearing phyllosilicates with limited success in matching the spectral properties of CM and CI chondrites. Transmission electron mic roscope and other analytical techniques suggest that Fe-bearing clays are more abundant in CI and CM chondrites than magnesian varieties. He re, we present the results of an examination of the reflectance spectr a of Fe-phyllosilicates, including serpentines and berthierines, of wh ich the latter were formerly known as septechlorites. We have measured the diffuse reflectance spectra of powdered samples from 0.3 to 25 mu m. We find that these minerals provide a better spectral match to man y of the features seen in CI and CM chondrites, and simple linear comb inations of the spectra of both Fe-and Mg-phyllosilicates closely appr oximate the spectra of CM and CI chondrites.