Geologic context, age constraints, and sedimentology of a Pleistocene volcaniclastic succession near Mount Spurr volcano, south-central Alaska

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Frequently anticipated questions:


What does this data set describe?

Title:
Geologic context, age constraints, and sedimentology of a Pleistocene volcaniclastic succession near Mount Spurr volcano, south-central Alaska
Abstract:
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.
Supplemental_Information:
The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships and correspond to subdirectories within the data distribution package. The metadata layer provides an FGDC metadata file and may include other documentation files. Attribute information for each data layer is described in this metadata file under the "Entity_and_Attribute_Information" section. Data layer contents:
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
  1. How should this data set be cited?

    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:

    Other_Citation_Details: 35 p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -151.942470
    East_Bounding_Coordinate: -151.834300
    North_Bounding_Coordinate: 61.304500
    South_Bounding_Coordinate: 61.287830

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 2009
    Ending_Date: 2014
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: digital-data, report

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a point data set.

    2. What coordinate system is used to represent geographic features?

      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.

  7. How does the data set describe geographic features?

    ri2014-2-sample-location-details.csv
    Field station name, sample name, and location coordinates (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

    Station
    Label assigned to identify the sampling sites for the composited samples. (Source: Alaska Division of Geological & Geophysical Surveys)

    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).

    Sample
    Label assigned to specify the composited sample. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    NULLA 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).

    Latitude
    Latitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:61.28783
    Maximum:61.3045
    Units:decimal degrees

    Longitude
    Longitude, NAD27 (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-151.94247
    Maximum:-151.8343
    Units:decimal degrees

    ri2014-2-border.shp
    A polygon that encompasses the maximum geographic extent of the data observations (Source: Alaska Division of Geological & Geophysical Surveys (DGGS))

    ri2014-2-detrital-zircon-data.xlsx
    Laboratory analytical results for detrital zircon samples (Source: Apatite to Zircon, Inc.)


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    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.

  3. To whom should users address questions about the data?

    Alaska Division of Geological & Geophysical Surveys
    GIS Manager
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    dggsgis@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays


Why was the data set created?

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.


How was the data set created?

  1. From what previous works were the data drawn?

    Hults, C.P. and others, 2013 (source 1 of 1)
    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.

    Type_of_Source_Media: paper
    Source_Contribution: detrital zircon analysis

  2. How were the data generated, processed, and modified?

    Date: 2009 (process 1 of 2)
    Sample collection - We collected two detrital zircon samples from sand-rich volcaniclastic strata of Qvc. Samples 09TMH323A and 09TMH342A were composited from material collected at seven and three field localities, respectively, with the former collected from the uppermost horizons of Qvc that crop out along the northern plateau edge and the latter collected from the lowermost strata exposed immediately south of the Capps Glacier moraine. An approximately 200-m-thick section of Qvc strata lies between the two sampled intervals. Sample names are adopted after the first field locality where composite sampling began for that stratigraphic interval (for example, 09TMH323). Several kilograms of medium- to coarse-grained sand were collected for each composited sample. Samples were collected with a rock hammer and a small folding shovel, taking care to avoid incorporating modern sediment.

    Date: 2010 (process 2 of 2)
    Detrital zircon analysis - 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) at Washington State University in Pullman, Washington. One hundred eight zircons were analyzed from sample 09TMH323A, yielding 62 concordant ages; three pre-Proterozoic age grains were discarded due to exceedingly large errors (200%). One hundred ten zircons were analyzed from sample 09TMH342A, yielding 95 concordant ages. During the current study, only nine individual zircons yielded ages older than 200 Ma (disregarding the three pre-Proterozoic grains noted above) and we do not apply a discordance filter to any of the data. All results are plotted using Isoplot 4.15, and errors are reported at 2-sigma. Note that the accompanying report provides a more comprehensive discussion of the analytical methods and applicable references.

    Data sources used in this process:

    • Hults, C.P. and others, 2013

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    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.

  2. How accurate are the geographic locations?

    Location coordinates were obtained using handheld GPS units with a typical error of 7 m or less.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    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.

  5. How consistent are the relationships among the observations, including topology?

    not applicable


How can someone get a copy of the data set?

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.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    RI 2014-2

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 01-May-2014
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.21 on Thu May 1 14:27:55 2014