sample-location-details: Field station name, sample name, and location coordinates border: A polygon that encompasses the maximum geographic extent of the data observations detrital-zircon-data: Laboratory analytical results for detrital zircon samples
Herriott, T.M., Nye, C.J., Reger, R.D., Wartes, M.A., LePain, D.L., and Gillis, R.J., 2014, Geologic context, age constraints, and sedimentology of a Pleistocene volcaniclastic succession near Mount Spurr volcano, south-central Alaska: Report of Investigation RI 2014-2, 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 North American Datum of 1927.
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.
Follows DGGS convention YYAAA9999-99a: YY=last two digits of year, AAA=geologist initials (one to three characters), 9999-99a (1-4 digits, followed by optional dashes and alpha characters). Samples were collected by Trystan M. Herriott (TMH).
| Value | Definition |
|---|---|
| NULL | A sample was not collected at this field station. |
Follows DGGS convention YYAAA9999-99a: YY=last two digits of year, AAA=geologist initials (one to three characters), 9999-99a (1-4 digits, followed by optional dashes and alpha characters). Samples were collected by Trystan M. Herriott (TMH).
| Range of values | |
|---|---|
| Minimum: | 61.28783 |
| Maximum: | 61.3045 |
| Units: | decimal degrees |
| Range of values | |
|---|---|
| Minimum: | -151.94247 |
| Maximum: | -151.8343 |
| Units: | decimal degrees |
Funding for work in the Tyonek-Capps Glacier area was provided by the State of Alaska, the National Cooperative Geologic Mapping Program's STATEMAP program under award numbers 09AC00177 and G10AC00321 (administered by the USGS), and program receipts from industry sponsors. Cook Inlet Region, Inc. (CIRI), granted permission to conduct fieldwork in the study area.
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A physiographically prominent, approximately 40 square km plateau lies roughly 20 km east of Mount Spurr volcano, northwestern Cook Inlet region, Alaska, and comprises the preserved remnant of a volcaniclastic succession, designated in this study as map unit Qvc. Although this readily mappable package of volcaniclastic rocks has been recognized in numerous studies during the past five decades, uncertainties regarding its age and origin have persisted. We describe the general characteristics of the volcaniclastic plateau, provide new age constraints for deposits, present lithofacies descriptions and interpretations of the volcaniclastic strata, and synthesize our observations and lithofacies analysis to propose an environment of transport and deposition for the unit. This digital data distribution package provides the latitude and longitude coordinates of the field stations noted within the report and a Microsoft Excel file of the U-Pb (LA-ICP-MS) detrital zircon geochronology results tables found in Appendix B of the report. This work was conducted as a component of a multi-year Cook Inlet basin analysis program aimed at developing a better understanding of the near-margin stratigraphic and structural components of the Cook Inlet petroleum system.
Hults, C.P., Wilson, F.H., Donelick, R.A., and O'Sullivan, P.B., 2013, Two flysch belts having distinctly different provenance suggest no stratigraphic link between the Wrangellia composite terrane and the paleo-Alaskan margin: Lithosphere v. 5, no. 6, Geological Society of America, Boulder, CO.
Data sources used in this process:
Detrital zircon samples were analyzed for U-Pb geochronology by Apatite to Zircon, Inc., via laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). We do not include grains 109833_100, 109833_104, and 109833_75 (sample 09TMH323A; see strike-through marks) in plots presented in the report (fig. 7) due to their exceedingly large 2-sigma errors. Questions regarding the organization or labelling of the data file can be best answered by the originating lab.
Location coordinates were obtained using handheld GPS units with a typical error of 7 m or less.
We provide the analytical data for all of the detrital zircon samples were analyzed. The tabluated results are in the the format specified by the lab.
not applicable
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- 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).
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RI 2014-2
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| Data format: | ASCII tabular files |
|---|---|
| Network links: |
<http://dx.doi.org/10.14509/27261> |
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