realcirgeo94_polygon geologic units realtstunion2_polygon Alternate view of the geologic units. Note that the bedrock polygons in this layer intersect the surficial unit polygons in locations where the units overlap. Users can use attribute values in this layer to selectivly trigger display of bedrock or surficial units. See the the attribute domain value definition of this layer for further explanation. realallsam_point sample locations for 1993 and 1994 field season realbedcon94_arc coded line surrounding bedrock units realcirstrat_point locations of stratigraphic sections measured in the field realfault94_arc coded lines describing faults realshear_arc coded line describing shears zones realsheargry_arc coded line describing sheas zones covered by surficial deposits cirstrike_point coded point locations of strike and dip measurements
Wiltse, M.A., Reger, R.D., Newberry, R.J., Pessel, G.H., Pinney, D.S., Robinson, M.S., and Solie, D.N., 1995, Geologic map of the Circle mining district, Alaska: Report of Investigation RI 95-2A, Alaska Division of Geological & Geophysical Surveys, Fairbanks.Online Links:
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.000001
Ordinates (y-coordinates) are specified to the nearest 0.000001
Planar coordinates are specified in meters
The horizontal datum used is Clarke_1866_UTM_Zone_6N.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.9786982.
| Value | Definition |
|---|---|
| 1 | Majjor oxide sample |
| 2 | Geochemical sample |
| 3 | Major oxide and geochemical sample |
| Value | Definition |
|---|---|
| Yes | Polygon contains hornfels |
| No | Polygon does not contain hornfels |
| Value | Definition |
|---|---|
| Yes | Polygon contains alteration pattern |
| No | Polygon does not contain alteration pattern |
| Value | Definition |
|---|---|
| S | Concealed bedrock |
| B | Exposed bedrock |
| U | Unmapped |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1995-2A_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI1995-2A_codeset.pdf> |
| Value | Definition |
|---|---|
| Srfbed | Refers to whether or not line segment is covered by overlying surficial deposits |
| s | Concealed fault |
| b | Exposed fault |
| u | In unmapped area |
Location of a geologic measurement: A= first measurement in this dataset, others in alphabethical order.
Location of a geologic measurement: A= first measurement in this dataset, others in alphabethical order.
| Value | Definition |
|---|---|
| 5 | Low-angle fault-sawteeth on upper plate-inferred |
| 6 | Low-angle fault-sawteeth on upper plate-queried, uncertain |
| 8 | Antiform-inferred or concealed |
| 9 | Antiform-uncertain, queried |
| 10 | High-angle fault-certain |
| 11 | High-angle fault-inferred |
| 12 | High-angle fault-inferred and concealed |
| 14 | Thrust fault-inferred and concealed |
| 15 | Thrust fault-inferred, queried |
| Value | Definition |
|---|---|
| 16 | Shear zone |
| Value | Definition |
|---|---|
| 0 | Invisible line |
| 16 | Shear zone |
| Value | Definition |
|---|---|
| 5 | Strike and dip of dominant foliation |
| 32 | Apparent strike and dip of dominant foliation |
| 33 | Bearing and plunge of lineation |
| Value | Definition |
|---|---|
| 5 | Strike and dip of dominant foliation |
| 32 | Apparent strike and dip of dominant foliation |
| 33 | Bearing and plunge of lineation |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 360 |
| Value | Definition |
|---|---|
| NULL | The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons. |
| unmapped | unmapped areas |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1995-2A_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI1995-2A_codeset.pdf> |
| Value | Definition |
|---|---|
| NULL | The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons. |
| Unknown | areas in which the bedrock lithology was not mapped |
| Formal codeset | |
|---|---|
| Codeset Name: | RI1995-2A_codeset.pdf |
| Codeset Source: | Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI1995-2A_codeset.pdf> |
| Value | Definition |
|---|---|
| NULL | The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons or the polygon does not contain an alteration pattern |
| no | The polygon does not contain an alteration pattern |
| yes | The polygon does contain an alteration pattern |
| Value | Definition |
|---|---|
| yes | Polygon contains hornfels |
| no | Polygon does not contain hornfels |
| NULL | The records appear to correspond the outer boundaries of the unmapped areas of the printed map. These values were likely created for cartographic reasons and do not form complete polygons or the polygon does not contain a hornfels pattern |
This map has been compiled and drawn under contract between the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, and WGM, Mining and Geological Consultants, Inc. Airborne geophysical data for the area was acquired by Dighem Surveys & Processing, Inc. in 1993.
(907) 451-5029 (voice)
(907) 451-5050 (FAX)
dggspubs@alaska.gov
The investigation of gold, and other mineral occurrences in conjunction with comprehensive geologic mapping and recently acquired geophysical data will provide a scientific basis for continued mineral exploitation that will economically benefit the region's inhabitants and the State of Alaska.
Wiltse, M.A., Reger, R.D., Newberry, R.J., Pessel, G.H., Pinney, D.S., Robinson, M.S., and Solie, D.N., 1993, Interim geologic map of the Circle mining district: Public Data File PDF 93-86, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska.Online Links:
Geologic data were digitized from a mylar geologic compilation.This compilation was done on a one to one scale, stable mylar of the USGS topographic base for each of the 1:63,360 scale USGS topographic bases included in the map area.Geologic data included in the compilation are the field maps and notes from this project. Surficial geological information was interpreted from false color infrared aerial photography and transferred to the basemap using a zoom transfer scope. The resulting compilation was then digitized with an average RMS error of .003 or less. The geologic interpretations presented in this report have undergone two technical reviews by geologists familiar with the subject of the report or geology of the map area. Reviewers' suggestions were incorporated into the final draft when deemed appropriate by the author.
Location data were determined visually using topographic maps at scales of 1:63,360 and larger. Altimeters were also used. GPS technology was not used to determine locations. Instead, geologic contacts, sample, and station locations were visually hand-plotted onto stable mylar bases from the field maps. The coordinates of sample and station locations were determined with a digitizing tablet. All samples plotted on the maps are included in the various tables.
This dataset includes geospatial information about geologic units, sample locations for radiometric age dates, structural features and structural measurements. Many of the lithologic and anaylitical samples collected for this project are housed at the Alaska Geologic Materials Center (GMC).
The logical consistency of the polygon, point and line files has been visually checked but not systematically verified. Some topology errors are known to exist in the polygon files.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
- Use_Constraints:
- Any hard copies or published datasets utilizing these datasets 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 datasets, 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.
907-451-5020 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov
The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.
Current publication is available on paper. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard.
| Data format: | SHP |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2514> |
| Data format: | |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/2514> |
DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media over the counter by mail, phone, fax, or email from the DGGS Fairbanks office.Turn around time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for a exact shipping ammount.
907-451-5020 (voice)