Major-oxide and trace-element geochemical data from rocks collected on Little Sitkin Island, from Little Sitkin Volcano, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Major-oxide and trace-element geochemical data from rocks collected on Little Sitkin Island, from Little Sitkin Volcano, Alaska
Abstract:
During the 2005 summer field season, geologists from the University of Alaska, Fairbanks and the U.S. Geological Survey, Alaska Volcano Observatory (AVO) conducted fieldwork in the western Aleutians, on Little Sitkin Island, Alaska. The primary purpose of the fieldwork was to install geophysical networks for volcano monitoring. As part of this effort, AVO geologists conducted reconnaissance fieldwork focused primarily on sample collection for geochemistry. The analytical data table associated with this report is available in digital format as .csv and is also available in .html and .csv from the AVO Geochemical Database (https://avo.alaska.edu/geochem/). Sample descriptions, locations, and sample types are included in the analytical data table. Files can also be downloaded from the DGGS website (<http://doi.org/10.14509/30440>).
Supplemental_Information: 
geochem-data: Major-oxide XRF and trace-element XRF and ICP-MS analyses of volcanic rocks collected on the surface of Little Sitkin volcano.
  1. How should this data set be cited?

    Larsen, J.F., Neal, C.A., and Cameron, C.E, 2020, Major-oxide and trace-element geochemical data from rocks collected on Little Sitkin Island, from Little Sitkin Volcano, Alaska: Raw Data File RDF 2020-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 4 p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 178.484270
    East_Bounding_Coordinate: 178.531300
    North_Bounding_Coordinate: 51.904117
    South_Bounding_Coordinate: 51.928761

  3. What does it look like?

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

    Calendar_Date: 2005
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: report and digital data

  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 0.000001. Longitudes are given to the nearest 0.000001. 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.

  7. How does the data set describe geographic features?

    rdf2020-4-geochem-data.csv, rdf2020-4-geochem-data-dictionary.csv
    Major-oxide XRF and trace-element XRF and ICP-MS analyses of volcanic rocks collected on the surface of Little Sitkin volcano. (Source: Alaska Division of Geological & Geophysical Surveys, Alaska Volcano Observatory, and University of Alaska Fairbanks, Department of Geosciences)

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?

    We thank George Rains and the crew of the Maritime Maid, who provided safe and efficient logistical support to access the field area. Helicopter pilot Bill Springer was a pleasure to work with and his expert skills enabled us to work to work effectively in the remote western Aleutians. We thank the U.S. Fish and Wildlife Service for permitting and logistical support in Adak, Alaska. Thank you to John Perreault for the location figure for this report.

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

    Alaska Division of Geological & Geophysical Surveys
    Metadata Manager
    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

Why was the data set created?

Geochemical data from these localities provide insight into the eruptive history and character of volcanic deposits and eruptions throughout Alaska.

How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 2005 (process 1 of 2)
    Field data collection - Rock samples were collected with the purpose of verifying the geochemistry of some of the prominent and possibly recent lava flows outcropping on the flanks of Little Sitkin volcano. With only two days of reconnaissance fieldwork, we targeted the voluminous block and ash flow deposits associated with the Patterson Point (Qp) unit, which was summarized by Snyder (1959) and representing a caldera forming eruption. The West Cove lava flow (Qlw) possibly represents one of the youngest eruptions from Little Sitkin (Miller and others, 1998). However, its young age has not been verified with age dating methods. Lava flow samples were chipped from the flows using a sledge hammer. Juvenile samples from fragmental units were either hand-picked as whole bomb or lapilli samples. Surface float was sampled from the ground surface.

    Date: 2005 (process 2 of 2)
    Rock sample analysis - Samples were chipped in the lab after fieldwork was completed to remove surface alteration. After chipping, the samples were cleaned in water in an ultrasonic bath and then dried at 60oC for 48 hours. Whole-rock major- and trace-element analyses were conducted by the Peter Hooper Geoanalytical lab at Washington State University (WSU). X-ray fluorescence (XRF) and Inductively-Coupled-Plasma Mass Spectrometry (ICP-MS) analyses were collected following the methods of Johnson and others (1999) and Knaack and others (unpub. data, 1994). The analyses reported here represent the same protocols applied by Nye and others (2018). The analytical precision and accuracy and significant digits of this dataset are consistent with the overview provided by Nye and others (2018). AVO geochemical analyses were re-calibrated in 2007 so that they are time-consistent, and the analyses reported here are internally consistent with data collected post-2007 (Nye and others, 2018).

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

    Cameron, C.E., Mulliken, K.M., Crass, S.W., Schaefer, J.R., and Wallace, K.L., 2019, Alaska Volcano Observatory geochemical database, version 2: Digital Data Series DDS 8 v. 2, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 22 p
    Nye, C.J., Beget, J.E., Layer, P.W., Mangan, M.T., McConnell, V.S., McGimsey, R.G., Miller, T.P., Moore, R.B., and Stelling, P.L., 2018, Geochemistry of some quaternary lavas from the Aleutian Arc and Mt. Wrangell: Raw Data File RDF 2018-1, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 29 p
    Snyder, G.L., 1959, Geology of Little Sitkin Island, Alaska: Bulletin B 1028-H, U.S. Geological Survey, United States.

    Online Links:

    Other_Citation_Details: p. 169-210, 1 sheet, scale 1:20,000

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

  1. How well have the observations been checked?

    This publication is intended for the timely release of raw field and/or analytical data and does not include interpretations (other than brief discussion of geologic context) of the data presented. It has undergone limited internal review and does not necessarily conform to the DGGS editorial standards. The analyses reported here represent the same protocols applied by Nye and others (2018). The analytical precision and accuracy and significant digits of this dataset are consistent with the overview provided by Nye and others (2018). AVO geochemical analyses were re-calibrated in 2007 so that they are time-consistent, and the analyses reported here are internally consistent with data collected post-2007 (Nye and others, 2018).

  2. How accurate are the geographic locations?

    Location data were collected using handheld GPS devices and recorded in field notebooks. Location data utilize the WGS84 datum.

  3. How accurate are the heights or depths?

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

    This data release is complete.

  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
    Metadata Manager
    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
  2. What's the catalog number I need to order this data set?

    RDF 2020-4

  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: 16-Jun-2020
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
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
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.21 on Tue Jun 16 14:39:38 2020