Coso Geothermal Spectral Library for Rocks and Minerals

Description

An integrated open mineral spectral library designed to enhance the utility and precision of mineral spectral data for geothermal exploration, developed from a reliable and comprehensive digital dataset for seamless sharing by integrating field data, the USGS spectral library, and pertinent information obtained from Coso geothermal field (Coso) in California. The ASD FieldSpec portable spectrometer was utilized for collecting spectral data, which was subsequently analyzed using the THOR Material Identification tool in ENVI, The Spectral Geologist (TSG) software by CSIRO, and the Fully Constrained Linear Spectral Unmixing algorithm (FCLSU) in MATLAB. Scanning Electron Microscopy (SEM) with a mineralogy-analyzing function was employed to assess the mineral composition of samples, ensuring precise mineralogical analysis. A portable X-ray fluorescence (pXRF) spectrometer was also utilized to gather information on elemental enrichment. A framework for developing spectra data and establishing spectral libraries for various geological cases was proposed within this study. The characteristic spectra of six alteration minerals - alunite, chalcedony, epidote, hematite, kaolinite, and opal - were acquired from Coso samples. The spectral library for the Coso alteration minerals was introduced for further application in academic study or industrial exploration. To browse the Coso Geothermal Spectral data and related figures from spreadsheets: #1 Unzip and store the following items in the same folder. 'Contact Probe Data.zip', 'Sample Photos.zip', and 'Coso spectra of higher-certainity minerals.xlsx'. #2 Open 'Coso spectra of higher-certainity minerals.xlsx'. The hyperlinks in the spreadsheet lead to the folders or figures of: spectra .asd file, spectra ASC II file, spectra plots, and sample photos. The spectra data is raw data without splice correction. Spectra .asd files require particular software to open. (These cannot be opened in GIS software such as ArcGIS.) Spectra ASC II files can be opened in a text editor or spread sheet program.

Resources

Name Format Description Link
57 Included are images of the samples collected from Coso Geothermal Area. https://gdr.openei.org/files/1528/ASD%20FieldSpec%20photo.zip
47 Helpful instructions on how to browse the Coso Geothermal Spectral data and related figures from interlinked spreadsheets. https://gdr.openei.org/files/1528/ReadMe.txt
57 This is the geodatabase including samples collected from Coso Geothermal Area with their locations, spectra, and other information. Data is mainly stored in GDB associated file formats. https://gdr.openei.org/files/1528/Coso_Mineral_Spectra.gdb.zip
57 Included data are .asd and .asc files for samples collected from Coso Geothermal Areas with their spectra. Data was collected with the ASD FieldSpec portable spectrometer. https://gdr.openei.org/files/1528/Contact%20Probe.zip
53 This excel sheet contains location and spectra information for higher-certainty minerals collected from the Coso Geothermal Area. https://gdr.openei.org/files/1528/Coso%20spectra%20of%20higher-certainity%20minerals.xlsx

Tags

  • spectrometry
  • x-ray-fluorescence
  • spectral-database
  • elemental-enrichment
  • spectral-data
  • scanning-electron-microscopy
  • coso
  • hydrothermal-alteration
  • hydrothermal
  • geology
  • gcf
  • california
  • coso-geothermal-field
  • spectral-library
  • geothermal
  • spectroscopy
  • alteration-minerals
  • energy

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