arar-summary-data-locations: Identification numbers, coordinates, sample descriptions, and summary ages of each sample step-heating-data: Power output levels and resultant measurements from each sample run
Twelker, Evan, Athey, J.E., Newberry, R.J., Griesel, G.A., Szumigala, D.J., Freeman, L.K., Elliott, B.A., Werdon, M.B., and Stevens, D.S.P., 2016, Geologic map of portions of the Livengood B-3, B-4, C-3, and C-4 quadrangles, Tolovana mining district, Alaska: Report of Investigation RI 2016-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.Online Links:
This is a point data set.
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in decimal degrees.
The horizontal datum used is World Geodetic System of 1984.
The ellipsoid used is WGS 84.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257223563.
Generic example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.
Value | Definition |
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NULL | Blank (NULL) values indicate that the lab sample number is identical to the field sample number. |
The lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided by the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number.
The samples presented in this report were collected by the authors or other DGGS staff.
Range of values | |
---|---|
Minimum: | -148.56559 |
Maximum: | -148.56559 |
Units: | decimal degrees |
Range of values | |
---|---|
Minimum: | 65.44400 |
Maximum: | 65.44400 |
Units: | decimal degrees |
The type of material that was selected for dating varied according to mineral composition and grainsize of the submitted rock sample. This field specifies whether the age was derived from a mineral separate (generally 1 to 10 individual crystals dated together as a single run), a single crystal, or the whole rock.
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the sample was a whole rock or that the mineral type was not recorded by the lab |
The minerals selected for dating would typically be grains of biotite, hornblende, or muscovite.
Value | Definition |
---|---|
NULL | We do not provide a description of the sample. |
Characters 1 to 254 of a brief sample or station description.
Value | Definition |
---|---|
NULL | Blank (NULL) values indicate that the descriptive text is shorter than 254 characters. |
Characters greater than 254 of the sample or station description.
Value | Definition |
---|---|
NULL | Blank (NULL) values indicate that the descriptive text is shorter than 509 characters. |
Characters greater than 509 of the sample or station description.
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the INTEGRATED_AGE_MA value was not calculated by the lab |
The values are a concatenation of the integrated age determination and the calculated error associated with the integrated age determination
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the PLATEAU_AGE_MA value was not calculated by the lab |
The values are a concatenation of the plateau age determination and the calculated error associated with the plateau age determination
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the PLATEAU_REMARKS value was not provided by the lab |
Free text
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the W_M_AGE_MA value was not calculated by the lab |
The values are a concatenation of the weighted mean age determination and the calculated error associated with the weighted mean average age determination
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the W_M_AGE_REMARKS value was not provided by the lab |
Free text
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the ISOCHRON_AGE value was not provided by the lab |
The values are a concatenation of the isochron age determination and the calculated error associated with the isochron age determination
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the ISOCHRON_REMARKS value was not provided by the lab |
Free text
A discussion of the preferred age for each analysis is provided in the accompanying lab report. The possible values are: plateau, isochron, weighted average, or integrated.
The preferred age for each analysis is discussed in detail in the accompanying lab report.
Generic example of a sample identifier: YYAAA9999X: YY=last two digits of year, AAA=geologist's initials (one to three characters), 9999=unique station number, X= optional alpha character which indicates that multiple samples were collected at a given location or that multiple observations were recorded in the project database.
The lab sample number is typically identical to the field sample number. However, in some cases, the sample number provided by the lab does differ from the number assigned in the field. We provide both numbers to document instances in which the sample numbers in the lab files differ from the field sample number.
Value | Definition |
---|---|
NULL | A NULL or blank values indicates that the values in the row were calculated by weighting the individual heating steps by the fraction of 39Ar released. |
Range of values | |
---|---|
Minimum: | 300 |
Maximum: | 9000 |
Units: | megawatts |
Value | Definition |
---|---|
NULL | The values in the row were derived from a heating step |
Value | Definition |
---|---|
NULL | The values in the row were derived from a heating step |
Range of values | |
---|---|
Minimum: | 0.003 |
Maximum: | 1 |
Range of values | |
---|---|
Minimum: | 9.26611 |
Maximum: | 58.7971 |
Range of values | |
---|---|
Minimum: | 0.0929 |
Maximum: | 1.07646 |
Range of values | |
---|---|
Minimum: | 0.00027 |
Maximum: | 0.01922 |
Range of values | |
---|---|
Minimum: | 0.00009 |
Maximum: | 0.01166 |
Range of values | |
---|---|
Minimum: | -0.00161 |
Maximum: | 0.18204 |
Range of values | |
---|---|
Minimum: | 0.00003 |
Maximum: | 0.00533 |
Range of values | |
---|---|
Minimum: | -5.1838 |
Maximum: | 91.53631 |
Range of values | |
---|---|
Minimum: | 0.09464 |
Maximum: | 3.69652 |
Range of values | |
---|---|
Minimum: | 0.00049 |
Maximum: | 0.03526 |
Range of values | |
---|---|
Minimum: | 0.00017 |
Maximum: | 0.0214 |
Range of values | |
---|---|
Minimum: | 0.0261 |
Maximum: | 0.03332 |
Range of values | |
---|---|
Minimum: | 0.00038 |
Maximum: | 0.00118 |
Range of values | |
---|---|
Minimum: | 0.09232 |
Maximum: | 1.66349 |
Range of values | |
---|---|
Minimum: | 34.61 |
Maximum: | 68.65 |
Units: | MA |
Range of values | |
---|---|
Minimum: | 0.62 |
Maximum: | 11.47 |
Units: | MA |
WeightedAverageOfJFromStandards value and error
This project is part of the Alaska Airborne Geophysical/Geological Mineral Inventory Program funded by the Alaska State Legislature and managed by State of Alaska, Department of Natural Resources (DNR), Division of Geological & Geophysical Surveys (DGGS). Partial funding for the 2003 geologic mapping was also provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number 03HQAG0055. The accompanying report provides additional acknowledgements to a multitude of people for their various contributions to this map.
907-451-5020 (voice)
dggsgis@alaska.gov
This data file presents 40Ar/39Ar step-heating geochronology results for a granite sample from the Livengood mining district.
This publication is a final report of research and has received two technical reviews as well as technical editing. Questions regarding the accuracy of information can be best answered by the originating lab.
Locations were recorded using handheld GPS devices. Location errors reported by the GPS were not recorded.
This data release is complete.
not applicable
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- This report, map, and/or dataset is 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. The 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. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data 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 or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
(907)451-5020 (voice)
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RI 2016-5
The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data 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 or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
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 by mail, phone, fax, or email from the DGGS Fairbanks office. 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. Turnaround 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 the exact shipping amount.
Data format: | ASCII tabular files |
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Network links: |
<http://dx.doi.org/10.14509/29665> |
(907)451-5020 (voice)