ââLearning about the degree of aqueous alteration of NEOs from ...
ââLearning about the degree of aqueous alteration of NEOs from ...
ââLearning about the degree of aqueous alteration of NEOs from ...
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MAIN ABSORPTION BANDS<br />
• The absorption bands identified so far are mostly due to clay minerals,<br />
and organic features:<br />
– Clay minerals in chondrites exhibit distinctive absorption peaks than those<br />
shown in terrestrial clays as also was found by Beck et al. (2010)<br />
Mineral (cm-1) (m) Notes<br />
OH stretching hydroxyl groups 3450 2.9 Mostly all groups<br />
(Montmorillonite,<br />
smectite, etc...)<br />
CC double bond stretch 1650 6.1 Organics, CMs<br />
CH 2 & CH 3 bend bands 1450 & 1400 6.9 & 7.1 Organics, CMs<br />
N-C libration band 1064 9.4 CO, CV<br />
Al/Si-OH libration bands 930-950 10.8-10.5 Variable location<br />
Al-O and Si-O, out <strong>of</strong> plane ~610 16.4 Variable location, CMs
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