Chert geochemistry discriminant analysis and K-meas cluster analysis: Rampart Project area, Tanana B-1 Quadrangle, east-central Alaska

A pilot study using discriminant analysis on major oxide and minor element data from 67 chert samples in the Rampart area, southeastern Tanana and southwest Livengood Quadrangles, western Yukon-Tanana Upland, Alaska, generally indicates a unique geochemical signature for the cherts of a given unit.Chert samples from five known type locales were used as standards of comparison: 1)Livengood Dome Chert (Ordovician), 2)Amy Creek unit (Proterozoic to early Paleozoic), 3)Rampart Group (Mississippian to Triassic), 4)Troublesome Creek unit (Devonian), and 5)Permian-Triassic clastic unit (associated with the Triassic-dated gabbro). Samples from the above units were compared to chert from Tanana B-1 area-units of unknown or uncertain affinity.We have determined that discriminant analysis of chert geochemistry can assign chert profiles to specific units with only minor exceptions, and is useful in geologic mapping of the Tanana B-1 Quadrangle (Reifenstuhl and others, 1997).

Data and Resources

Field Value
access_constraints ["Use Constraints: Any hardcopies or published data sets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these data sets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.", "Access Constraints: This report, map, and/or data set are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys"]
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bbox-north-lat 65.09
bbox-south-lat 65.5333
bbox-west-long -150.533
contact-email dggspubs@alaska.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2009-03-01"}]
frequency-of-update notPlanned
licence [" "]
metadata-date 2009-02-26
metadata-language eng; USA
metadata_type geospatial
progress completed
resource-type dataset
responsible-party [{"name": "State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-150.533, 65.5333], [-138.333, 65.5333], [-138.333, 65.09], [-150.533, 65.09], [-150.533, 65.5333]]]}
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • amy-dolomite
  • barium
  • bedrock-geologic-map
  • chemistry
  • chert
  • ckan
  • devonian
  • geo
  • geochemical-data
  • geochemical-surveys
  • geochemistry
  • geoss
  • livengood-dome-chert
  • livengood-quadrangle
  • major-oxides
  • mesozoic
  • metasedimentary-rocks
  • methods
  • national
  • north-america
  • paleozoic
  • permian
  • phosphorus
  • potassium
  • rampart-group
  • rampart-manley-mining-district
  • rampart-mining-district
  • rare-earth-elements
  • rubidium
  • ruby-terrane
  • silica
  • strontium
  • tanana-quadrangle
  • titanium
  • trace-elements
  • triassic
  • united-states
  • vanadium
  • wickersham-unit
  • yttrium
  • yukon-tanana-terrane
  • zirconium
isopen False
metadata_created 2025-11-19T17:54:42.793537
metadata_modified 2025-11-19T17:54:42.793543
notes A pilot study using discriminant analysis on major oxide and minor element data from 67 chert samples in the Rampart area, southeastern Tanana and southwest Livengood Quadrangles, western Yukon-Tanana Upland, Alaska, generally indicates a unique geochemical signature for the cherts of a given unit.Chert samples from five known type locales were used as standards of comparison: 1)Livengood Dome Chert (Ordovician), 2)Amy Creek unit (Proterozoic to early Paleozoic), 3)Rampart Group (Mississippian to Triassic), 4)Troublesome Creek unit (Devonian), and 5)Permian-Triassic clastic unit (associated with the Triassic-dated gabbro). Samples from the above units were compared to chert from Tanana B-1 area-units of unknown or uncertain affinity.We have determined that discriminant analysis of chert geochemistry can assign chert profiles to specific units with only minor exceptions, and is useful in geologic mapping of the Tanana B-1 Quadrangle (Reifenstuhl and others, 1997).
num_resources 1
num_tags 44
title Chert geochemistry discriminant analysis and K-meas cluster analysis: Rampart Project area, Tanana B-1 Quadrangle, east-central Alaska