Preliminary characterization of two coals from the upper Prince Creek Formation, Sagwon Bluffs, North Slope, Alaska

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Frequently anticipated questions:

What does this data set describe?

Title:
Preliminary characterization of two coals from the upper Prince Creek Formation, Sagwon Bluffs, North Slope, Alaska
Abstract:
In July of 2018, the Alaska Division of Geological & Geophysical Surveys (DGGS) studied and sampled the coal beds within the upper section of the Prince Creek Formation at Sagwon Bluffs. Sagwon Bluffs lies 55 miles south of Deadhorse (Prudhoe Bay), Alaska, and approximately one mile east of the Dalton Highway, on the west side of the Sagavanirktok River. At Sagwon Bluffs, Upper Cretaceous to Paleocene rocks of the Prince Creek and Sagavanirktok Formations are exposed. The upper Prince Creek Formation at this location contains several distinct coal seams interbedded with fine-grained fluvial sandstone. A lower coal seam and an upper seam were channel sampled for this study. This Preliminary Interpretive Report presents results from coal quality (proximate and ultimate analysis), Rock-Eval, vitrinite reflectance, and kerogen microscopy analyses. Users can access the complete report and digital data from the DGGS website: http://doi.org/10.14509/30556.
Supplemental_Information: 
coal-quality:    proximate and ultimate coal quality analyses, heating value and coal rank	
rock-eval:    Rock-Eval, vitrinite reflectance (Ro), and total organic carbon (TOC)
  1. How might this data set be cited?
    Harun, N.T., and Wartes, M.A., 2020, Preliminary characterization of two coals from the upper Prince Creek Formation, Sagwon Bluffs, North Slope, Alaska: Preliminary Interpretive Report PIR 2020-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 13 p.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -148.66775
    East_Bounding_Coordinate: -148.66076
    North_Bounding_Coordinate: 69.40527
    South_Bounding_Coordinate: 69.4025
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2018
    Ending_Date: 2020
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: report, tables
  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 1983.
      The ellipsoid used is GRS 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222101000025.
  7. How does the data set describe geographic features?
    pir2020-4-coal-quality.csv, pir2020-4-coal-quality-data-dictionary.csv
    proximate and ultimate coal quality analyses, heating value and coal rank (Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Geochemical Testing (2005 N. Center Avenue, Somerset, PA))
    Sample_id
    sample identifier assigned by the person who collected the sample (Source: this report) string
    Station_id
    field station identifier assigned by the person who collected the sample (Source: this report) string
    Collector
    sample collector (Source: this report) string
    Date
    date data collected (Source: this report) datetime
    Analysis_date
    date data analyzed in lab (Source: this report) datetime
    Unit
    geologic rock unit (Source: this report) string
    Location
    field station location name (Source: this report) string
    Latitude_NAD83
    latitude coordinate, NAD83 (Source: this report) float
    Longitude_NAD83
    longitude coordinate, NAD83 (Source: this report) float
    Lithology
    sample lithology (Source: this report) string
    Description
    sample description (Source: this report) string
    Proximate_Moisture
    measured percent of sample containing moisture, measured by the weight difference before and after heating the sample above the boiling point of water (Source: this report) float
    Proximate_Ash
    measured percent of inorganic residue after combustion (Source: this report) float
    Proximate_Volatile_Matter
    measured percent of combustible material (Source: this report) float
    Proximate_Fixed_Carbon
    measured percent of carbon remaining in sample after combustion (Source: this report) float
    Proximate_Volatile_Matter_dryashfree
    measured sample percent combustible material excludes all moisture and ash (Source: this report) float
    Proximate_Fixed_Carbon _dryashfree
    measured percent of carbon remaining in sample after combustion, excludes all moisture and ash (Source: this report) float
    Ultimate_Hydrogen
    measured weight percent hydrogen (Source: this report) float
    Ultimate_Carbon
    measured weight percent of carbon (Source: this report) float
    Ultimate_Nitrogen
    measured weight percent of nitrogen (Source: this report) float
    Ultimate_Sulfur
    measured weight percent of sulfur (Source: this report) float
    Ultimate_Oxygen
    total oxygen in weight percent as calculated as the remaining major elemental value from subtraction of the other major elements and ash (Source: this report) float
    Ultimate_Ash
    measured amount of noncombustible material in sample (Source: this report) float
    Pyritic_Sulfur
    measured weight percent of pyritic sulfur in the sample (Source: this report) float
    Organic_Sulfur
    measured weight percent of organic sulfur in the coal matrix as calculated by the difference in total sulfur minus elemental and inorganic sulfur (Source: this report) float
    Equilibrium_Moisture
    calculated coal sample moisture level at equilibrium moisture conditions in accordance with ASTM method D1412 (Source: this report) float
    Heating_Value_BTUperlb
    caloric value of coal is a measure of energy produced from the coal, BTU (Source: this report) float
    Coal_Rank
    coal rank differentiating the stages of coalification (Source: this report) string
    pir2020-4-rock-eval.csv, pir2020-4-rock-eval-data-dictionary.csv
    Rock-Eval, vitrinite reflectance (Ro), and total organic carbon (TOC) (Source: Alaska Division of Geological & Geophysical Surveys (DGGS) and Weatherford Laboratories (Houston, Texas))
    Sample_id
    sample identifier assigned by the person who collected the sample (Source: this report) string
    Station_id
    field station identifier assigned by the person who collected the sample (Source: this report) string
    Collector
    sample collector (Source: this report) string
    Date
    date data collected (Source: this report) timedate
    Analysis_date
    date data analyzed in lab (Source: this report) timedate
    Unit
    geologic rock unit (Source: this report) string
    Location
    field station location name (Source: this report) string
    Latitude_NAD83
    latitude coordinate, NAD83 (Source: this report) float
    Longitude_NAD83
    longitude coordinate, NAD83 (Source: this report) float
    Lithology
    sample lithology (Source: this report) string
    Description
    sample description (Source: this report) string
    TOC
    total organic carbon (Source: this report) float
    S1
    the amount of free hydrocarbons in the sample (mg of hydrocarbon per gram of rock) (Source: this report) float
    S2
    the amount of hydrocarbons that are produced through the thermal cracking process. An indicator of generation potential (mg of hydrocarbon per gram of rock) (Source: this report) float
    S3
    the amount of CO2  produced during pyrolysis of kerogen. (in milligrams CO2 per gram of rock) (Source: this report) float
    TmaxC
    the temperature during pyrolysis where maximum hydrocarbons are released, Celsius (Source: this report) float
    Ro
    vitrinite reflectance (Source: this report) float
    HI
    hydrogen index (HI = [100 x S2]/TOC). HI is used to define the origin of organic matter (Source: this report) float
    OI
    oxygen index (OI = [100 x S3]/TOC) (Source: this report) float
    S2perS3
    S2/S3 (Source: this report) float
    S1perTOCX100
    S1/TOC (Source: this report) float
    PI
    production index used to determine the maturity of the organic matter. (PI = S1/[S1 + S2]) (Source: this report) float
    Ro_mean
    mean vitrinite reflectance (Source: this report) float

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?
    The authors gratefully acknowledge Joe East and the funding and support of the National Coal Data System of the United States Geological Survey. We thank David LePain for reviewing 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
    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?

This Preliminary Interpretive Report presents results from coal quality (proximate and ultimate analysis), Rock-Eval, vitrinite reflectance, and kerogen microscopy analyses.

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: 2018 (process 1 of 3)
    Sample collection - Two coal seams were sampled in the upper Prince Creek Formation at Sagwon Bluffs. The lower coal (18NH008-2) is a one-meter-thick seam consisting of black vitreous coal layers and thin splits of carbonaceous mudstone. The upper coal (18MAW003) seam is approximately 50 m up-section from the lower seam, where it is exposed along several spines below the gravel cliff of the Sagavanirktok Formation. The upper coal seam forms a conspicuous black band above an olive-green weathering granule-bearing sandstone in the upper Prince Creek Formation. This 1.5 m-thick seam has a relatively high ash content, but includes locally developed vitreous laminae of pure coal.
    Date: 2018 (process 2 of 3)
    Proximate and Ultimate analyses - Geochemical Testing (2005 N. Center Avenue, Somerset, PA) conducted Proximate and Ultimate analyses following the American Society for Testing and Materials standards for coal analyses (ASTM, 2002).
    Date: 2018 (process 3 of 3)
    Rock-Eval, vitrinite reflectance, and TOC - Weatherford Laboratories (Houston, Texas) analyzed samples for Rock-Eval pyrolysis. Weatherford analyzed a total of 96 subsamples for vitrinite reflectance (Ro) values as well as visual identification and reflection of specific maceral types in these coals; 48 subsamples were taken from 18NH008-2 and 48 subsamples from 18MAW003. The hydrous pyrolysis samples from each seam have not been submitted for analysis.
  3. What similar or related data should the user be aware of?
    Flaig, P.P., and van der Kolk, D.A., 2015, Depositional environments of the Prince Creek Formation along the east side of the Toolik River, Sagavanirktok Quadrangle, North Slope, Alaska: Preliminary Interpretive Report PIR 2015-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 17 p., 1 sheet
    Gillis, R.J., Decker, P.L., Wartes, M.A., Loveland, A.M., and Hubbard, T.D., 2014, Geologic map of the south-central Sagavanirktok Quadrangle, North Slope, Alaska: Report of Investigation RI 2014-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 24 p., 2 sheets, scale 1:63,360

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

  1. How well have the observations been checked?
    This publication has undergone limited peer review but does not necessarily conform to DGGS editorial standards. Interpretations or conclusions contained in this publication are subject to change. The data presented for this release summarize laboratory findings. The data deliverables are available on request. Users will need to contact the originating laboratory for additional detail regarding laboratory procedures and measurement precision.
  2. How accurate are the geographic locations?
    Sample locations were collected using hand-held GPS units. Uncertainty associated with the location coordinates is in the range of 1-10 meters.
  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
    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? PIR 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: 05-Nov-2020
Metadata author:
Alaska Division of Geological & Geophysical Surveys
Attn: Simone Montayne
Metadata Manager
3354 College Road
Fairbanks, AK
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 2.9.50 on Thu Nov 05 15:32:53 2020