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Spectral characteristics of chlorites and Mg-serpentines using high- resolution reflectance spectroscopy

Journal of Geophysical Research

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Abstract

The present laboratory study using high-resolution reflectance spectroscopy (0.25-2.7 ??m) focuses on two primary phyllosilicate groups, serpentines and chlorites. The results show that it is possible to spectrally distinguish between isochemical end-members of the Mg-rich serpentine group (chrysotile, antigorite, and lizardite) and to recognize spectral variations in chlorites as a function of Fe/Mg ratio (~8-38 wt% Fe). The position and relative strength of the 1.4-??m absorption feature in the trioctahedral chlorites appear to be correlated to the total iron content and/or the Mg/Si ratio and the loss on ignition values of the sample. Spectral differences in the 2.3-??m wavelength region can be attributed to differences in lattice environments and are characteristic for specific trioctahedral chlorites. The 1.4-??m feature in the isochemical Mg-rich serpentines (total iron content ~1.5-7.0 wt%) show marked spectral differences, apparently due to structural differences. -Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Spectral characteristics of chlorites and Mg-serpentines using high- resolution reflectance spectroscopy
Series title:
Journal of Geophysical Research
Volume
94
Issue:
B10
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article