7/30/2003 j. moersch / astep workshop 1 vis/nir reflectance spectrometer: 2003 field test results j....
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7/30/2003 J. Moersch / ASTEP Workshop 1
Vis/NIR Reflectance Vis/NIR Reflectance Spectrometer:Spectrometer:
2003 Field Test Results2003 Field Test Results
J. MoerschJ. MoerschU. TennesseeU. Tennessee
Life in the Atacama ASTEP Life in the Atacama ASTEP WorkshopWorkshop
29 July 200329 July 2003
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Some Specs:
Wavelength range: 350-2500 nm
Spectral Resolution: 3-30 nm
Time req’d for one spectrum: 1-2 seconds in sunlight
Dimensions: 33 x 11 x 41 cm
Mass: 8.6 kg
ASD Portable Field SpectrometerASD Portable Field Spectrometer
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ASD Portable Field SpectrometerASD Portable Field Spectrometer
Spectrometer
Laptop
Fiber Optic
Pan/Tilt Platform 1 deg. Foreoptic
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ASD Portable Field SpectrometerASD Portable Field Spectrometer
Calibration standard Artificial illumination source
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ASD Portable Field SpectrometerASD Portable Field Spectrometer
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Hematite + Clay + Calcite
Hematite + Calcite
Sulfate
Sulfate + Hematite
7/30/2003 13J. Moersch / ASTEP Workshop
Mixtures of iron-oxide, clay, carbonate.
Carbonate particularly strong in 7.
No carbonate in 6a or 6b.
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Fe-Oxide (Goethite?) + Clay + Calcite
Pyroxene (?)
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16 and 19 have strong sulfate features.
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More Fe-oxide with minor clay.
21 was requested calibration spectrum.
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Mostly featureless except some minor clays.
Could be any number of things – feldspars, halite, fine-grained particulates, etc.
Fe-oxide feature less prominent than most previous spectra.
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Chlorophyll?
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Summary
•Relatively diverse mineral suite
•Extensive evidence for aqueous history (clays, carbonates, sulfates)
•Evidence for alteration (Fe-oxide, clays)
•Possibly primary igneous minerals (pyroxene)
•Fe-oxide features less prominent further south
•No unambiguous evidence for life