Reifenstuhl, R.R.
Newberry, R.J.
Haug, S.A.
Clautice, K.H.
Liss, S.A.
Weber, F.R.
200903
Chert geochemistry discriminant analysis and K-meas cluster analysis: Rampart Project area, Tanana B-1 Quadrangle, east-central Alaska
tabular digital data
Report of Investigation
RI 2009-2
Fairbanks, Alaska
Alaska Division of Geological & Geophysical Surveys
http://dx.doi.org/10.14509/19341
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
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.alaska.gov 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
Geology of part of east-central Alaska
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
Geologic map of the Livengood quadrangle, Alaska
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