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(For further information on spectroscopy, see:
http://speclab.cr.usgs.gov)
TITLE: Gyp+jar+ill BRCM1 Marysvale DESCRIPT
DOCUMENTATION_FORMAT: MIXTURE
SAMPLE_ID: BRCM1
MIXTURE_TYPE: Intimate
MIXTURE: Gypsum, Jarosite, Illite.
FORMULA: CaSO4*2H2O and Na,K(Fe+3)3(SO4)2(OH)6 and (K,H30)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,H20]
FORMULA_HTML: CaSO4*2H2O and Na,K(Fe+3)3(SO4)2(OH)6 and (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2H2O
COLLECTION_LOCALITY: Big Rock Candy Mountain, Marysvale, Utah USA
ORIGINAL_DONOR: Barnaby Rockwell
COLLECTION_LATITUDE: N38deg 30.7053' # degrees and decimal minutes (N or S) COLLECTION_LONGITUDE: W112deg 15.7402' # degrees and decimal minutes (W or E)
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:
ASD lab spectrum of sample BRCM1 from Big Rock Candy Mountain, Marysvale, Utah. XRD: Natural intimate mix of quartz, albite, gypsum, natrojarosite, pyrite, illite/muscovite. Proximal propylitic alteration from feeder zone.
Weathered andesitic lava flows from pyritic, propylitically altered feeder zone of hydrothermal system formed at ~21 Ma (Miocene). Fine-grained, yellowish jarositic coatings on light grey, thoroughly altered rock.
See: Rockwell, B.W.,2002, Descriptions, spectral plots, and digital reflectance spectra of samples applied to spectral analysis of imaging spectroscopy data: Utah (East Tintic Mountains, Oquirrh Mountains, Wasatch Mountains, and Tushar Mountains), Nevada (Goldfield Hills), and New Mexico (Jemez Mountains), USA, 1999-2002: U.S. Geological Survey Open-File Report 02-407, electronic web pages. (http://pubs.usgs.gov/of/2002/ofr-02-407)
END_SAMPLE_DESCRIPTION.
XRD_ANALYSIS:
Albite (major), quartz (minor), gypsum (minor), natrojarosite (minor), illite (minor), muscovite (minor), pyrite (trace), dolomite (trace).
See: Rockwell, B.W.,2002, Descriptions, spectral plots, and digital reflectance spectra of samples applied to spectral analysis of imaging spectroscopy data: Utah (East Tintic Mountains, Oquirrh Mountains, Wasatch Mountains, and Tushar Mountains), Nevada (Goldfield Hills), and New Mexico (Jemez Mountains), USA, 1999-2002: U.S. Geological Survey Open-File Report 02-407, electronic web pages. (http://pubs.usgs.gov/of/2002/ofr-02-407)
END_XRD_ANALYSIS.
COMPOSITIONAL_ANALYSIS_TYPE: NONE # XRF, EM(WDS), ICP(Trace),WChem
COMPOSITION_TRACE: None
COMPOSITION_DISCUSSION:
None
END_COMPOSITION_DISCUSSION.
MICROSCOPIC_EXAMINATION:
Scanning Electron Microscope (SEM) images found crystals of natrojarosite ranging in size from 2-5 microns in diameter, large crystals of gypsum of 10 microns and larger, and amorphous coatings of iron oxides and hydroxides around grains of other minerals.
END_MICROSCOPIC_EXAMINATION.
SPECTROSCOPIC_DISCUSSION:
Spectrum has many spectral features. The electronic region (.35-1.35 microns) is dominated by the spectral features of jarosite while the 1.4 and 2 micron regions have bands attributable to all jarosite, gypsum, and illite.
END_SPECTROSCOPIC_DISCUSSION.
SPECTRAL_PURITY: 1b2_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 8203 | 0.2-3.0µm | 200 | g.s.= |
| LIB_SPECTRA: | splib06a r 25237 | g.s.= |