Chemical and isotopic composition of gas, water, and solids from the 2019-2020 water lake in Halema’uma’u Crater, Kīlauea Volcano, Hawaii: X-Ray Diffraction (XRD) of solids filtered from water samples
Samples of the crater lake water were filtered in the field with a 0.45 micron filter. Subsequently, additional precipitates formed in the solute-rich samples (secondary precipitates) which were subsequently filtered in the lab with a 0.45 micron filter. The mineralogy of secondary precipitates for samples HM19-01 and HM20-01A,B,C that were collected on 10/26/2019 and on 1/17/2020, respectively was determined by X-ray diffraction (XRD). Analysis was carried out at the British Natural History Museum with a Enraf-Nonius PDS120 diffractometer equipped with a primary Germanium (111) monochromator and an INEL 120° curved position sensitive detector (PSD). Data were collected from 7-120° 2θ using Co Kalpha1 radiation with operating conditions of 40 kV and 30 mA. The X-ray beam was collimated to 0.24 x 2 mm and the samples were analyzed in asymmetric reflection geometry. The angular linearity of the PSD was calibrated using the standards silver behenate and silicon. Samples were suspended in acetone and mounted on a zero-background quartz substrate. Data were collected for 20 hours. Mineral identification was performed using the PDF4+ database.
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| description | Samples of the crater lake water were filtered in the field with a 0.45 micron filter. Subsequently, additional precipitates formed in the solute-rich samples (secondary precipitates) which were subsequently filtered in the lab with a 0.45 micron filter. The mineralogy of secondary precipitates for samples HM19-01 and HM20-01A,B,C that were collected on 10/26/2019 and on 1/17/2020, respectively was determined by X-ray diffraction (XRD). Analysis was carried out at the British Natural History Museum with a Enraf-Nonius PDS120 diffractometer equipped with a primary Germanium (111) monochromator and an INEL 120° curved position sensitive detector (PSD). Data were collected from 7-120° 2θ using Co Kalpha1 radiation with operating conditions of 40 kV and 30 mA. The X-ray beam was collimated to 0.24 x 2 mm and the samples were analyzed in asymmetric reflection geometry. The angular linearity of the PSD was calibrated using the standards silver behenate and silicon. Samples were suspended in acetone and mounted on a zero-background quartz substrate. Data were collected for 20 hours. Mineral identification was performed using the PDF4+ database. |
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| identifier | http://datainventory.doi.gov/id/dataset/USGS_61402159d34e1449c5d38538 |
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| modified | 2023-03-30T00:00:00Z |
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| spatial | -155.29700, 19.39400, -155.26400, 19.42000 |
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| title | Chemical and isotopic composition of gas, water, and solids from the 2019-2020 water lake in Halema’uma’u Crater, Kīlauea Volcano, Hawaii: X-Ray Diffraction (XRD) of solids filtered from water samples |
