7/30/2003 j. moersch / astep workshop 1 vis/nir reflectance spectrometer: 2003 field test results j....

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

7/30/2003 2J. Moersch / ASTEP Workshop

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

7/30/2003 3J. Moersch / ASTEP Workshop

ASD Portable Field SpectrometerASD Portable Field Spectrometer

Spectrometer

Laptop

Fiber Optic

Pan/Tilt Platform 1 deg. Foreoptic

7/30/2003 4J. Moersch / ASTEP Workshop

ASD Portable Field SpectrometerASD Portable Field Spectrometer

Calibration standard Artificial illumination source

7/30/2003 5J. Moersch / ASTEP Workshop

ASD Portable Field SpectrometerASD Portable Field Spectrometer

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Hematite + Clay + Calcite

Hematite + Calcite

Sulfate

Sulfate + Hematite

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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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7/30/2003 20J. Moersch / ASTEP Workshop

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