Title of article :
The dominance of cold and dry alteration processes on recent Mars, as revealed through pan-spectral orbital analyses
Author/Authors :
Salvatore، نويسنده , , M.R. and Mustard، نويسنده , , J.F. and Head III، نويسنده , , J.W. and Rogers، نويسنده , , A.D. and Cooper، نويسنده , , R.F.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
12
From page :
261
To page :
272
Abstract :
Classic low-albedo regions of the martian surface are investigated using combined reflectance and emission (“pan-spectral”) data to constrain the types of alteration mineral phases that are present at spectrally significant abundances (>10–15%). The lack of hydrated mineral species observed using near-infrared data suggests that anhydrous chemical alteration dominates at the regional scale. Spectral characteristics in the VNIR and TIR are consistent with those associated with weathering processes identified in the hyper-arid, hypo-thermal, and geologically stable McMurdo Dry Valleys of Antarctica, where oxidative weathering processes dominate and significant aqueous alteration does not occur. In addition, the spectral trends associated with oxidative weathering processes are similar to regional trends in VNIR spectral characteristics observed on Mars and potentially complicate the spectral interpretation of basaltic terrains. Collectively, these relationships suggest that the martian surface has been dominated by cold, dry, and stable conditions since the formation of these low-albedo regions. While significant at regional scales early in martian history, aqueous alteration appears to be predominantly absent from large-scale basaltic regions on Mars.
Keywords :
infrared spectroscopy , Mars , alteration , Remote sensing , volcanics , Weathering
Journal title :
Earth and Planetary Science Letters
Serial Year :
2014
Journal title :
Earth and Planetary Science Letters
Record number :
2332976
Link To Document :
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