ââLearning about the degree of aqueous alteration of NEOs from ...

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SPECTRA OF CI and CM CHONDRITES • For the CMs several absorption bands exhibit different depths in agreement with previous studies using IR micro-spectroscopy [e.g. Beck et al. (2010), GCA 74] • The variable depth in OH bands at ~3 m exhibited by some of the selected CMs is probably consequence of different degrees of aqueous alteration Trigo-Rodríguez et al. (2012) LPSC abstract #1443
MAIN ABSORPTION BANDS • The absorption bands identified so far are mostly due to clay minerals, and organic features: – Clay minerals in chondrites exhibit distinctive absorption peaks than those shown in terrestrial clays as also was found by Beck et al. (2010) Mineral (cm-1) (m) Notes OH stretching hydroxyl groups 3450 2.9 Mostly all groups (Montmorillonite, smectite, etc...) CC double bond stretch 1650 6.1 Organics, CMs CH 2 & CH 3 bend bands 1450 & 1400 6.9 & 7.1 Organics, CMs N-C libration band 1064 9.4 CO, CV Al/Si-OH libration bands 930-950 10.8-10.5 Variable location Al-O and Si-O, out of plane ~610 16.4 Variable location, CMs
Page 1 and 2: “Learning about the degree of aqu
Page 3 and 4: WHAT WE KNOW ABOUT CARBON-RICH RICH
Page 5 and 6: IR SPECTROMETER IR BEAM SAMPLE haz
Page 7: ADDITIONAL STUDIED CHONDRITES • S
Page 11 and 12: CO and CV CHONDRITE GROUPS • The
Page 13 and 14: CONCLUSIONS • Laboratory analyses

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