EZ-ID - Scalars add new functionality for understanding
Spectral scalars can enhance the geologist’s understanding of crystallinity changes,
alteration pattern shifts and geochemical conditions. EZ-ID now supports spectral scalars for
Al-OH bonds, kaolinite crystallinity (Kx), illite spectral maturity (ISM), chlorite spectral maturity
(CSM), Mg-OH bonds, Fe-OH bonds, Fe3t (mineral type), Fe3i (mineral intensity), and Al-Fe-
The Al-OH absorption feature at 2200nm wavelength position provides indication of
geochemical conditions at the time of alteration. 2160—2240 wavelength variations.
Kaolinite crystallinity influences the shape of the Al-OH feature. A Kx greater than 1 indicates
kaolinite produced by weathering; less than 1 is associated with kaolinite produced by high
temperature alteration events. The lower the Kx, the higher the formation temperature.
Values greater than 1 indicate a low grade metamorphic
illite; less than 1— illites produced at higher temperatures.
Values greater than 1 indicate a low metamorphic grade chlorite; less than 1 are chlorites
produced at a higher temperature alteration event.
The wavelength position of this feature near 2350nm indicates geochemical conditions at the
time of alteration.
The wavelength near 2260nm position of this feature indicates geochemical conditions at the
time of alteration.
Hydroxide-type Fe+3 minerals typically have Fe3t values greater than 900nm; oxide type Fe+3
minerals have vales less than 900nm.
The higher the Fe3i value the more intense the FE+3 absorption.
Reports the wavelength of the deepest absorption feature of these three. Features
centered in 2160-2370nm range.
1 Canal Street ◊ Unit B1
Lawrence, MA 01840 USA
Tel: 978 687-1833 ◊ Fax: 978 945-0372
Copyright © 2012 Spectral Evolution, Inc
The oreXpress spectrometer and EZ-ID software are trademarks of Spectral Evolution, Inc.
Scalars are automatically part of the EZ-ID mineral identification screen. They provide information that can enhance a
geologist's understanding of geochemical conditions at the time of alteration.