Analysis of airborne visible-infrared imaging spectrometer (AVIRIS) data of the Iron Hill, Colorado, carbonatite-alkalic igneous complex

Rowan, Lawrence C.; Bowers, Timothy L.; Crowley, John S.; Antón-Pacheco, Carmen; Gumiel, Pablo; Kingston, Marguerite J.

doi:10.2113/gsecongeo.90.7.1966

Cited by 31 publications

(26 citation statements)

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“…Surveys of carbonatites and alkaline intrusive complexes in the literature can be divided into coarse spectral resolution spaceborne studies (e.g., Oppenheimer 1998;Rowan and Mars 2003;Mars and Rowan 2011), fine spectral resolution airborne studies (e.g., Crowley et al 1988;Rowan et al 1995;Bowers and Rowan 1996;Bedini 2009), and fine resolution ground and lab-based studies (e.g., Rowan et al 1986;McHugh et al 2000). The early work by Rowan, Crowley, and Mars recognized the potential of exploiting REE absorption features with hyperspectral imaging, however, focus of their future research shifted to other geological systems, use of ASTER multispectral satellite imagery, and planetary remote sensing.…”

Section: Review Of Ree-related Reflectance Spectroscopy Studiesmentioning

confidence: 99%

Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates

Turner

Rivard

Groat

2014

American Mineralogist

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An understanding of the mineralogy and petrogenesis of rare earth element deposits has significant implications for their economic viability. Lanthanide-bearing compounds are known to produce sharp absorption features in the visible to short-wave infrared region (VIS-SWIR), however, a significant knowledge gap exists between the fields of hyperspectral reflectance spectroscopy and rare earth element mineralogy. Reflectance spectra were collected from four bastnäsite samples, two parisite samples, and one synchysite sample from the visible into the short-wave infrared. These REE fluorocarbonate mineral samples were characterized via scanning electron microscopy and electron probe microanalysis. Sharp absorptions of REE-bearing minerals are mostly the result of 4f-4f intraconfigurational electron transitions and for the light REE-enriched fluorocarbonates, the bulk of the features can be ascribed to Nd 3+ , Pr 3+ , Sm 3+ , and Eu 3+ . The lanthanide-related spectral responses of the REE fluorocarbonates are consistent across the group, supporting the notion that the REE cation site is very similar in each of these minerals. Carbonate-related spectral responses differed between these minerals, supporting the notion that the crystallographic sites for the carbonate radical differ between bastnäsite, synchysite, and parisite. Exploitable spectral differences include a distinct absorption band at 2243 nm that separates bastnäsite from synchysite and parisite. Similarly, for bastnäsite a dominantly Pr 3+ -related absorption band located is at 1968 nm, while in synchysite and parisite it occurs at 1961 nm.

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Section: Review Of Ree-related Reflectance Spectroscopy Studiesmentioning

confidence: 99%

Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates

Turner

Rivard

Groat

2014

American Mineralogist

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“…Emissivity values for natrocarbonatites do not appear to have been documented hitherto, although Rowan et al ( 1995) present re¯ectance spectra for weathered calcium-carbonatite rocks from Iron Hill, Colorado. In order to estimate emissivities, therefore, visible-to-near-infrared re¯ectance spectra were obtained in the laboratory for a range of carbonate and silicate rocks collected at Ol Doinyo Lengai.…”

Section: Analysis Of Near-infrared Datamentioning

confidence: 73%

Satellite observation of active carbonatite volcanism at Ol Doinyo Lengai, Tanzania

Oppenheimer¹

1998

International Journal of Remote Sensing

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Natrocarbonatite lavas extruded by Ol Doinyo Lengai volcano, Tanzania, exhibit the lowest known magmatic eruption temperatures, ranging between #500 and 600ß C. Nevertheless, as shown here, the near-infrared bands 5 and 7 of the Landsat Thematic Mapper ( TM), and the mid-infrared channel 3 of the spaceborne Advanced Very High Resolution Radiometer (AVHRR) are able to detect thermal emission from active carbonatites. Laboratory-measured visible-to-near-infrared re¯ectance spectra of both silicate and carbonatite rocks from Ol Doinyo Lengai are used to infer spectral emissivities, enabling interpretation of satellite measurements. Given the remote location of this unique volcano, satellite remote sensing could play a valuable role in its future surveillance, and o ers a potential means for distinguishing between silicate and carbonatite eruptions.

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“…These metasomatic rocks are commonly called fenites and the process fenitization (Winter, 2001). Rowan et al (1995) showed reflectance spectra of fenites from the Iron Hill carbonatite complex, Colorado, displaying an Mg-OH doublet absorption feature due to amphibole and weathered fenites displaying only weak Al-OH due to illite and/or Mg-OH absorption features caused by biotite or chlorite. The fenite rocks spectrally analyzed in this study, in the SWIR wavelength region display Mg-OH absorption features ( Fig.…”

Section: Fenitesmentioning

confidence: 99%

Mapping lithology of the Sarfartoq carbonatite complex, southern West Greenland, using HyMap imaging spectrometer data

Bedini

2009

Remote Sensing of Environment

101

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Analysis of airborne visible-infrared imaging spectrometer (AVIRIS) data of the Iron Hill, Colorado, carbonatite-alkalic igneous complex

Cited by 31 publications

References 0 publications

Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates

Visible and short-wave infrared reflectance spectroscopy of REE fluorocarbonates

Satellite observation of active carbonatite volcanism at Ol Doinyo Lengai, Tanzania

Mapping lithology of the Sarfartoq carbonatite complex, southern West Greenland, using HyMap imaging spectrometer data

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