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(For further information on spectrsocopy, see:
http://speclab.cr.usgs.gov)
TITLE: Pyroxene Basalt CU01-20A DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: CU01-20A
MIXTURE_TYPE: Intimate
MIXTURE: Pyroxene + other mineral phases
FORMULA: Not Available
FORMULA_HTML: Not Available
COLLECTION_LOCALITY: 6 km south of Western Center, Cuprite, Nevada, USA
ORIGINAL_DONOR: Gregg Swayze
COLLECTION_LATITUDE: N37 29.12' # degrees and decimal minutes (N or S)
COLLECTION_LONGITUDE: W117 14.48' # degrees and decimal minutes (W or E) P> DATUM: NAD27 # coordinate datum
CURRENT_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
ULTIMATE_SAMPLE_LOCATION: U.S.G.S. Denver Spectroscopy Laboratory
SAMPLE_DESCRIPTION:
This sample was collected from the instrusive basalt plug 6 km south of the western alteration center within the Cuprite Hills. The sample spectrum was of a slightly weathered surface. Most other surfaces in the intrusive body are heavily coated with desert varnish and hence have much weaker pyroxene absorptions.
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Augite (major), diopside (major), anorthite (major), forsterite (trace), quartz (trace), analcime (trace).
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: XRF # XRF, EM(WDS), ICP(Trace), WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
None
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
The spectrum has characteristic absorptions from pyroxene at 1.0391 microns with very weak absorptions from hydrated phases (clays?) at 2.2057 and 2.3113 microns.
See: Swayze, G.A., 1997, The hydrothermal and structural history of the Cuprite Mining District, southwestern Nevada: an integrated geological and geophysical approach: unpublished Ph.D. Dissertation, University of Colorado at Boulder, 399p.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1a2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
| LIB_SPECTRA_HED: | where | Wave Range | Av_Rs_Pwr | Comment |
|---|---|---|---|---|
| LIB_SPECTRA: | splib05a r 8966 | 0.2-3.0µm | 200 | g.s.= |
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