7/30/2003 J. Moersch / ASTEP Workshop 1 Vis/NIR Reflectance Spectrometer: 2003 Field Test Results J. Moersch U. Tennessee Life in the Atacama ASTEP Workshop.

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Presentation transcript:

7/30/2003 J. Moersch / ASTEP Workshop 1 Vis/NIR Reflectance Spectrometer: 2003 Field Test Results J. Moersch U. Tennessee Life in the Atacama ASTEP Workshop 29 July 2003

7/30/2003 2J. Moersch / ASTEP Workshop Some Specs: Wavelength range: 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 Spectrometer

7/30/2003 3J. Moersch / ASTEP Workshop ASD Portable Field Spectrometer Spectrometer Laptop Fiber Optic Pan/Tilt Platform1 deg. Foreoptic

7/30/2003 4J. Moersch / ASTEP Workshop ASD Portable Field Spectrometer Calibration standardArtificial illumination source

7/30/2003 5J. Moersch / ASTEP Workshop ASD Portable Field Spectrometer

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7/30/ J. Moersch / ASTEP Workshop Hematite + Clay + Calcite Hematite + Calcite Sulfate Sulfate + Hematite

7/30/ J. Moersch / ASTEP Workshop Mixtures of iron-oxide, clay, carbonate. Carbonate particularly strong in 7. No carbonate in 6a or 6b.

7/30/ J. Moersch / ASTEP Workshop Fe-Oxide (Goethite?) + Clay + Calcite Pyroxene (?)

7/30/ J. Moersch / ASTEP Workshop 16 and 19 have strong sulfate features.

7/30/ J. Moersch / ASTEP Workshop More Fe-oxide with minor clay. 21 was requested calibration spectrum.

7/30/ J. Moersch / ASTEP Workshop 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.

7/30/ J. Moersch / ASTEP Workshop Chlorophyll?

7/30/ J. Moersch / ASTEP Workshop

7/30/ J. 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