magnetic-susceptibility: Magnetic susceptibility measurements, location coordinates, and field station descriptions
Naibert, T.J., Twelker, Evan, Wypych, Alicja, Athey, J.E., Newberry, R.J., Lopez, J.A., Regan, S.P., Sicard, K.R., Wildland, A.D., and Wyatt, W.C., 2020, Field station locations and magnetic susceptibility data collected in 2019 for the Eastern Tanacross Project, Tanacross and Nabesna quadrangles, Alaska: Raw Data File RDF 2019-9, 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 1/298.257223563000025.
Generic example of a station identifier: YYAAA9999X: YY=last two digits of the year the station was collected, 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.
| Range of values | |
|---|---|
| Minimum: | -142.530853 |
| Maximum: | -140.998906 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | 62.78085 |
| Maximum: | 63.766381 |
| Units: | decimal degrees |
A brief sample or station description.
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility measurement was not measured |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 289 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 274 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 260 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 174 |
| Units: | 10^-4 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 240 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.001 |
| Maximum: | 77 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.01 |
| Maximum: | 76.6 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.01 |
| Maximum: | 61.2 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.02 |
| Maximum: | 71.4 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.019 |
| Maximum: | 73 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.02 |
| Maximum: | 32.2 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.06 |
| Maximum: | 23.2 |
| Units: | 10^-3 SI |
| Value | Definition |
|---|---|
| NULL | average magnetic susceptibility was not measured |
| Range of values | |
|---|---|
| Minimum: | 0.0005 |
| Maximum: | 247.4 |
| Units: | 10^-3 SI |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 12 |
| Units: | 10^-3 SI |
The DGGS Eastern Tanacross Project was funded by State of Alaska general funds and by the U.S. Geological Survey under Cooperative Agreement Number G19AC00262. Disclaimer: The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.
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These data were collected as a component of the DGGS Eastern Tanacross Project. The purpose of this project is to produce a more accurate and modern geologic map and supporting data that will promote mineral discovery in eastern Interior Alaska.
This report provides locations, field descriptions of rocks, and magnetic susceptibility measurements from rock outcrop and/or hand samples throughout the map area. Field rock descriptions are composed of observations and interpretations made by project geologists in the field or in the field office and may not be updated to reflect further observations, geochemical data, microscopic investigation, or other information. Field rock descriptions in this data file have not been reviewed for technical content and should be considered preliminary. Magnetic susceptibility measurements were collected using Terraplus KT-10 model handheld magnetic susceptibility meters. The KT-10 meters have a maximum sensitivity of 1 x 10-6 SI units on smooth surfaces and a measurable susceptibility range between 0.001 x 10-3 to 1999.99 x 10-3 SI. The values reported here are for individual measurements performed on representative surfaces of the sampled rock outcrop and/or hand samples. Up to twelve susceptibility readings were recorded at each field station. Efforts were made to avoid anisotropic effects by measuring multiple sides of outcrops and/or hand samples whenever possible. Magnetic susceptibility was not measured at a minority of field stations because hand samples were intensely weathered or were not large enough to cover the coil of the KT-10 meter for accurate measurement. These station locations are provided without magnetic susceptibility readings for completeness. This data set is being released into the DGGS Raw Data File series. The information has been examined by several geologists familiar with the study area, but the data and accompanying report have not been formally reviewed for technical content or for conformity to the editorial standards of DGGS.
Location data for field stations were collected using GPS-enabled tablets or smartphones running the ESRI Collector App. Data were merged into an ArcGIS geodatabase. The devices have a reported error of about 10 m. Latitude and longitude are reported in the WGS84 datum.
This data release is complete.
not applicable
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RDF 2019-9
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| Data format: | report and digital data |
|---|---|
| Network links: |
<http://doi.org/10.14509/30268> |
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