Reifenstuhl, R.R. Newberry, R.J. Haug, S.A. Clautice, K.H. Liss, S.A. Weber, F.R. 200903 tabular digital data Report of Investigation RI 2009-2 Fairbanks, Alaska Alaska Division of Geological & Geophysical Surveys http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=19341 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). This data was created to determine if discriminant analysis of chert geochemistry can assign chert profiles to specific units in order to facilitate geologic mapping of the Tanana B-1 Quadrangle The data are available in tabular format as comma delimited ascii files organized into one layer in this metadata file under the "Entity_and_Attribute_Information" section.The layer is as follows: >Geochemistry sample locationssample names and locations, formation designations, geochemical results (Table 1) 1988 1996 1998 ground condition Complete None planned -150.533 -138.333 65.09 65.5333 None Barium Bedrock Geologic Map Chemistry Chert Geochemical Surveys Geochemical Data Geochemistry Major Oxides Metasedimentary rocks Methods Phosphorus Potassium Rare Earth Elements Rubidium Silica Strontium Titanium Trace Elements Vanadium Yttrium Zirconium None Rampart Mining District Rampart-Manley Mining District Tanana Quadrangle Livengood Quadrangle None Amy Dolomite Livengood Dome Chert Rampart Group Ruby Terrane Wickersham Unit Yukon-Tanana Terrane None Devonian Mesozoic Paleozoic Permian Triassic This report, map, and/or data set are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys 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. State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys GIS Data Manager/Cartographer mailing and physical

3354 College Road

Fairbanks AK 99709-3707 (907) 451-5020 (907) 451-5050 dggspubs@alaska.gov You may view our web site at http://www.dggs.dnr.state.ak.us for the latest information on available data.Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change. Microsoft Windows XP SP2, ArcGIS 9.+, and any text editor. Attributes in this dataset consist of: positional information reported in latitude and longitude (decimal degrees - NAD27) and major oxide and minor element geochemical data. All field locations were visually determined by the geologists in the field using a Brunton compass and altimeter and recorded on a 1:63,360 United States Geologic Survey topographic map. Coordinates were digitized visually from the field maps in the office on a digitizing table. The collected cherts were crushed and pelletized for X-Ray Fluorescence analyses at the University of Alaska Fairbanks, further detail regarding analytical methodology is not available. No topologic relationships are present in this data set. This dataset contains all of the chert samples that were collected from outcrops in the Tanana A-1 quadrangles from rock units of unknown or uncertain affinity. Representative samples of cherts typical each of local were selected based on a visual determination of their lithology. In addition several samples that were collected outside the primary area were also included. Exact horizontal position accuracy is unknown but the locations are estimated to be accurate within 20 meters. Several samples have unknown or vaugely known localities and are noted as '---' within the dataset. Dover, J.H. 1994 v. G-1 book chapter Boulder, CO Geological Society of America in Plafker, G., and Berg, H.C., eds,. The Geology of Alaska paper Unknown Unknown ground condition Dover, 1994 source of regional geologic rock unit distribution Weber, F.R. Wheeler, K.L. Rinchart, C.D. Chapman, R.M. Blodgett, R.B. 1992 map U.S. Geological Survey Open-File Report 92-562 20 p., 1 sheet (scale 1:250,000) paper 1992 ground condition Weber and others, 1992 Source of regional geologic rock unit distribution, description and correlation of surface exposures immediately east of the Tanana B-1 map area. As part of our 1:63,360 scale geologic field mapping of the Tanana B-1 Quadrangle, we collected chert outcrop samples with the plan of using geochemistry to test whether we might be able to discern differences in the cherts of different ages and different mappable rock units. Dover, 1994 Weber and others, 1992 1996 The collected cherts were crushed and pelletized for X-Ray Fluorescence analyses at the University of Alaska Fairbanks. The pellets were analyzed for nineteen elements: ten major oxide elements measured in weight percent (aluminum, calcium, iron, potassium, magnesium, manganese, sodium, phosphorous, silicon, and titanium) and nine trace elements measured in parts per million (barium, cerium, chromium, lanthanum, rubidium, strontium, vanadium, yttrium, and zirconium). 1998 0.00000001 0.0000001 Decimal degrees North American Datum of 1927 Clarke 1866 6378137 298.25722210088 Table 1 Table_1_data.csv Table 1 is a summary of samples analyzed for geochemistry from the Rampart project area.Information includes sample name, the formation from which the samples were collected, coordinates of sample collection, and the geochemistry results. Alaska Division of Geological & Geophysical Surveys Sample "Sample" refers to the name of the sample given by the geologist.Naming convention is based on the two-digit year, the two-digit collector initials, and a unique sample identifier number. Alaska Division of Geological & Geophysical Surveys "Sample" refers to a unique identifier assigned by the geologist. Samples are named by 2 digit year, followed by 2-3 digit geologist initials, and a 2-3 digit unique sample number. If more than one sample was collected from the station location, each is assigned a letter (a, b, c, and so forth). Rock unit/Comments Refers to the geologic uniit from which the sample was collected and/or comments regarding the sample location. Alaska Division of Geological & Geophysical Surveys Amy Creek Dolomite/Livengood Quadrangle sample was Amy Creek Dolomite collected in the Livengood 250:000 Quadrangle Alaska Division of Geologica & Geophysical Surveys Livengood Dome Chert pit/Livengood Quadrangle sample was collected from the Livengood Dome Chert pit in the Livengood 250:000 Quadrangle Alaska Division of Geological & Geophysical Surveys Devonian age-Troublesome Creek Unit/Livengood Quadrangle sample is Devonian age, collected from Troublesome Creek Unit in the Livengood 250:000 Quadrangle Alaska Division of Geological & Geophysical Surveys Triassic age chert sample is Triassic age chert Alaska Division of Geological & Geophysical Surveys Livengood Dome Chert? sample may be Livengood Dome Chert Alaska Division of Geological & Geophysical Surveys Amy Creek Dolomite? - location approximate sample may be Amy Creek Dolomite and the collection location is approximated Alaska Division of Geological & Geophysical Surveys Amy Creek Dolomite? sample is questionably Amy Creek Dolomite Alaska Division of Geological & Geophysical Surveys Amy Creek Dolomite?/Tanana A-1 Quadrangle, S19T5N R14W sample may be Amy Creek Dolomite and the location was not identified by GPS device, but was collected from the Tanana A-1 1:63,360 Quadrangle in specified township and range Alaska Division of Geological & Geophysical Surveys Not Amy Creek Dolomite Sample was not Amy Creek Dolomite Alaska Division of Geological & Geophysical Surveys Amy Creek Dolomite? apatite rich! sample is questionably Amy Creek Dolomite, and is apatite-rich Alaska Division of Geological & Geophysical Surveys Not Amy Creek Dolomite or Devonian age unit sample is not Amy Creek Dolomite or Devonian in age Alaska Division of Geological & Geophysical Surveys Livengood Dome Chert? Near sample 96SL174? Sample may be Livengood Dome Chert and was collected near sample 96SL174 Alaska Division of Geological & Geophysical Surveys Rampart Group sample is from the Rampart Group Alaska Division of Geological & Geophysical Surveys Not Livengood Chert sample is not Livengood Dome Chert Alaska Division of Geological & Geophysical Surveys Devonian? or Traissic? SW1/4 S19 T5N R13W, Tanana A-1 Quadrangle sample may be Devonian or Triassic and was collected from the specified township and range in the Tanana A-1 1:63,360 Quadrangle Alaska Division of Geological & Geophysical Surveys Amy Creek Dolomite? Livengood Dome Chert? sample may be Amy Creek Dolomite or Livengood Dome Chert Alaska Division of Geological & Geophysical Surveys Latitude (dec. degree) Latitude of sample collection measured in decimal degrees Alaska Division of Geological & Geophysical Surveys 65.2542 65.5333 decimal degrees Longitude (dec. degrees) Longitude of sample collection measured in decimal degrees Alaska Division of Geological & Geophysical Surveys -138.333 -150.4151728 decimal degrees Ba Elemental Barium Alaska Division of Geological & Geophysical Surveys 5 4938 parts per million (ppm) Ce Elemental Cesium Alaska Division of Geological & Geophysical Surveys 0 68 parts per million (ppm) Rb Elemental Rubidium Alaska Division of Geological & Geophysical Surveys 0 82 parts per million (ppm) Sr Elemental Stronium Alaska Division of Geological & Geophysical Surveys 1 134 parts per million (ppm) Y Elemental Yttrium Alaska Division of Geological & Geophysical Surveys 1 90 parts per million (ppm) Zr Elemental Zirconium Alaska Division of Geological & Geophysical Surveys 1 220 parts per million (ppm) Cr Elemental Chromium Alaska Division of Geological & Geophysical Surveys 0 173 parts per million (ppm) V Elemental Vanadium Alaska Division of Geological & Geophysical Surveys 3 189 parts per million (ppm) La Elemental Lanthanum Alaska Division of Geological & Geophysical Surveys 0 40 parts per million (ppm) SiO2 Silicon Dioxide Alaska Division of Geological & Geophysical Surveys 99.1 75.6 weight percent (wt%) TiO2 Titanium Dioxide Alaska Division of Geological & Geophysical Surveys .01 .66 weight percent (wt%) Al3O3 Aluminum Oxide Alaska Division of Geologica & Geophysical Surveys .2 10.89 weight percent (wt%) Fe2O3 Iron Oxide Alaska Division of Geological & Geophysical Surveys .03 8.49 weight percent (wt%) MnO Manganese Oxide Alaska Division of Geological & Geophysical Surveys 0.00 .40 weight percent (wt%) MgO Magnesium Oxide Alaska Division of Geological & Geophysical Surveys .03 3.79 weight percent (wt%) CaO Calcium Oxide Alaska Divsion of Geological & Geophysical Surveys 0.0 7.83 weight percent (wt%) Na2O Sodium Oxide Alaska Division of Geological & Geophysical Surveys 0.0 2.76 weight percent (wt%) K2O Potassium Oxide Alaska Division of Geological & Geophysical Surveys 0.0 2.25 weight percent (wt%) P2O5 Phosphorous Oxide Alaska Division of Geological & Geophysical Surveys 0.0 6.4 weight percent (wt%) 20090226 Alaska Division of Geological & Geophysical Surveys mailing and physical

3354 College Road

Fairbanks Alaska 99709 United States (907) 451-5010 dggspubs@alaska.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998