[petrography] [geochemistry] geophysical logs [mineralogy] [stratigraphy]

This database contains petrographic, geochemical, and geophysical data for volcanic, sedimentary, and plutonic rocks of the 10,000 square kilometer southwestern Nevada volcanic field (SWNVF), which includes the entire Nevada Test Site (NTS). The database complies with protocols of Structured Query Language (SQL), allowing construction of relationships among these data, from micrometer-diameter spots chemically analyzed by microprobe within individual mineral grains, to stratigraphic identities for rock columns within drill holes, and outcrop up to 4 km thick. For descriptions of database tables, including the number of records within each table, see "Downloads from the PGG database" via the homepage.

[bullet] Locations - All data reference a location via the loc_id, described in database table location.
[bullet] Samples and splits - All petrographic and geochemical data reference samples via the sam_id. Geophysical data and geologic intervals, in contrast, do not reference samples. The database describes sam_ids in database table sample. Splits define specific portions of samples used for petrographic or geochemical analyses, as described below.
[bullet] Petrographic and mineralogic analyses - Petrographic analyses include standard and photomap-documented analyses.
  [bullet] The database describes split_ids in database table pa_split for petrographic splits in table pa_measure.
  [bullet] The database describes individual grain components in database table ma_gr_measure and individual clasts in database table ma_clast_measure from petrographic splits with photomap-documented petrographic analyses. Detailed petrographic analyses are based primarily on these data.
  [bullet] The database describes quantitative and qualitative microprobe analyses in database table probe_rep. Quantitative analyses are provided in database table probe_measure; qualitative analyses are used to ascertain or confirm the identity of grain components.
  [bullet] The database describes analyses for bulk mineralogy by X-ray diffraction analysis (XRD) in database table xrd_split, with analyses provided in table xrd_measure.
[bullet] Chemical analyses and age dates - The database describes split_ids in database table ca_split, with chemical analyses provided in database table ca_measure. Analyses, which include almost all elements of the periodic table, were obtained primarily by X-ray fluorescence (XRF) and neutron activation analysis (NAA). The database describes age dates in database table age_measure .
[bullet] Layers within vertical rock columns (geologic intervals) - The database defines the stratigraphic assignment for layers within NTS drill holes in database table strat_int, the lithology in lith_int, the alteration in alt_int, and fractures and lithophysal zones in frac_physae_int. These definitions, termed geologic intervals, are comprehensive for all of the Pahute Mesa testing area of the NTS, and for the southern half of the Yucca Flat area.
[bullet] Geophysical (log) data - The database provides individual log analyses (runs) in database table geophys_int. Most runs represent unique combinations of drill hole (loc_id) and log type (log_type_code), but many multiple runs repeat measurements for a log type that overlap in depth partially or in entirety with a single drill hole. Almost all logs were obtained from the eastern half of the Pahute Mesa testing area of the NTS, and for the southern half of the Yucca Flat area.


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