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Short-lived radioisotope geochronology

Assessing the Impact of the Deepwater Horizon Oil Spill on Sediments and Benthic Communities on the West Florida Shelf and Slope

DOI:
10.7266/N7VT1Q1Z
 
UDI:
Y1.x031.000:0003
Last Update:
Jul 15 2015 14:20 UTC
 
Dataset Author(s):
Brooks, Gregg
Point of Contact:
Larson, Rebekka
University of South Florida / College of Marine Science
140 7th Ave South
St. Petersburg, Florida  33701
USA
larsonra@eckerd.edu
Funding Source:
Florida Institute of Oceanography (FIO)
Data Collection Period:
2010-11-18 to 2012-10-18

Identified Submitted Review Available
3 3 3 3

Abstract:

Short-lived Radioisotope (SLR) data are generated for selected core sub-samples at 2mm sampling intervals for “surficial unit” and 5mm sampling resolution intervals to base of cores. SLR data generated include sample activity (dpm/g) of: 1) Excess 234Th activity, which is calculated by measuring the total 234Th activity and the subtraction of the measured or estimated “background” 234Th activity, 2) Excess 210Pb activity, which is calculated by measuring the total 210Pb activity and subtraction of the measured background 210Pb activity (average of 214Pb; 295keV, 214Pb: 351keV, and 214Bi; 609keV), 3) 137Cs activity, and 4) 7Be activity. Where appropriate, age dating is calculated in calendar years for 234Th and 210Pb activity profiles, as well as linear accumulation rates (LAR) expressed as cm/yr, and mass accumulation rates (MAR) expressed as g/cm2/yr.

Purpose:

Determine short-lived radioisotope activities, geochronology, accumulation rates

Theme Keywords:

Sedimentology, Short-lived radioisotopes, Geochronology

File Format:

Excel Spreadsheet

Dataset Downloads:

4

Short-lived radioisotope geochronology



Identification Information
Distribution Information
Metadata Maintenance Information

Metadata: 
  File identifier: 
      Y1.x031.000-0003-metadata.xml
  Language: 
      eng; USA
  Character set: 
    Character set code: 
      utf8
  Hierarchy level: 
    Scope code: 
      dataset
  Metadata author: 
    Responsible party: 
      Individual name: 
          Rebekka Larson
      Organisation name: 
          Eckerd College
      Position name: 
          Research Technician
      Contact info: 
        Contact: 
          Phone: 
            Telephone: 
              Voice: 
                  727-864-8992
              Facsimile: 
          Address: 
            Address: 
              Delivery point: 
                  Eckerd College
                  Marine Science Dept.
                  4200 54th Ave S.
              City: 
                  St. Petersburg
              Administrative area: 
                  FL
              Postal code: 
                  33711
              Country: 
                  USA
              Electronic mail address: 
                  larsonra@eckerd.edu
      Role: 
        Role code: 
          pointOfContact
  Metadata author: 
    Responsible party: 
      Individual name: 
          Benjamin Flower
      Organisation name: 
          University of South Florida
      Position name: 
      Contact info: 
        Contact: 
          Phone: 
            Telephone: 
              Voice: 
                  727-553-3986
          Address: 
            Address: 
              Delivery point: 
                  140 7th Ave South
              City: 
                  St. Petersburg
              Administrative area: 
                  FL
              Postal code: 
                  33701
              Country: 
                  USA
              Electronic mail address: 
                  bflower@marine.usf.edu
      Role: 
        Role code: 
          pointOfContact
  Date stamp: 
      2015-10-05T13:01:38-05:00
  Metadata standard name: 
      ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
  Metadata standard version: 
      ISO 19115-2:2009(E)
  Dataset URI: 
      https://data.gulfresearchinitiative.org/metadata/Y1.x031.000:0003
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Identification info: Data identification: Citation: Citation: Title: Short-lived radioisotope geochronology Alternate title: Date: Date: Date: 2013-11-01 Date type: Date type code: publication Abstract: Short-lived Radioisotope (SLR) data are generated for selected core sub-samples at 2mm sampling intervals for “surficial unit” and 5mm sampling resolution intervals to base of cores. SLR data generated include sample activity (dpm/g) of: 1) Excess 234Th activity, which is calculated by measuring the total 234Th activity and the subtraction of the measured or estimated “background” 234Th activity, 2) Excess 210Pb activity, which is calculated by measuring the total 210Pb activity and subtraction of the measured background 210Pb activity (average of 214Pb; 295keV, 214Pb: 351keV, and 214Bi; 609keV), 3) 137Cs activity, and 4) 7Be activity. Where appropriate, age dating is calculated in calendar years for 234Th and 210Pb activity profiles, as well as linear accumulation rates (LAR) expressed as cm/yr, and mass accumulation rates (MAR) expressed as g/cm2/yr. Purpose: Determine short-lived radioisotope activities, geochronology, accumulation rates Status: Progress code: completed Point of contact: Responsible party: Individual name: Rebekka Larson Organisation name: Eckerd College Position name: Research Technician Contact info: Contact: Phone: Telephone: Voice: 727-864-8992 Facsimile: Address: Address: Delivery point: Eckerd College Marine Science Dept. 4200 54th Ave S. City: St. Petersburg Administrative area: FL Postal code: 33711 Country: USA Electronic mail address: larsonra@eckerd.edu Role: Role code: pointOfContact Point of contact: Responsible party: Individual name: Gregg Brooks Organisation name: Eckerd College Position name: Contact info: Contact: Phone: Telephone: Voice: 727-864-8992 Address: Address: Delivery point: Natural Sciences Collegium Sheen Science Center, SHA-102 City: St. Petersburg Administrative area: FL Postal code: 33711 Country: USA Electronic mail address: brooksgr@eckerd.edu Role: Role code: pointOfContact Descriptive keywords: Keywords: Keyword: Sedimentology Keyword: Short-lived radioisotopes Keyword: Geochronology Type: Keyword type code: theme Descriptive keywords: Keywords: Keyword: West Florida shelf/slope Keyword: North/Northeastern Gulf of Mexico Type: Keyword type code: place Language: eng;USA Topic category: Topic category code: geoscientificInformation Extent: Extent: Geographic element: Geographic bounding box: West bound longitude: -87.89162 East bound longitude: -86.3314 South bound latitude: 28.97617 North bound latitude: 29.6599 Geographic element: BoundingPolygon: Polygon: gml:MultiPoint: gml:pointMember: Point: gml:pos: 29.6599 -86.3314 gml:pointMember: Point: gml:pos: 29.40747 -86.5753 gml:pointMember: Point: gml:pos: 29.30465 -86.67677 gml:pointMember: Point: gml:pos: 29.17473 -86.81493 gml:pointMember: Point: gml:pos: 29.08355 -86.91342 gml:pointMember: Point: gml:pos: 29.38533 -86.74525 gml:pointMember: Point: gml:pos: 29.4854 -86.86525 gml:pointMember: Point: gml:pos: 29.22008 -86.64042 gml:pointMember: Point: gml:pos: 29.12093 -87.86545 gml:pointMember: Point: gml:pos: 28.97667 -87.87333 gml:pointMember: Point: gml:pos: 29.09983 -87.2655 gml:pointMember: Point: gml:pos: 29.09882 -87.86603 gml:pointMember: Point: gml:pos: 29.11958 -87.26433 gml:pointMember: Point: gml:pos: 29.12058 -87.86998 gml:pointMember: Point: gml:pos: 28.97617 -87.86833 gml:pointMember: Point: gml:pos: 29.13328 -87.26097 gml:pointMember: Point: gml:pos: 28.97905 -87.89162 gml:pointMember: Point: gml:pos: 29.1227 -87.26622 gml:pointMember: Point: gml:pos: 29.30575 -86.67637 Temporal element: Temporal extent: Extent: Time period: Description: ground condition Begin date: 2010-11-18 End date: 2012-10-18 Supplemental Information: Total 234Th (63keV) activity (dpm/g) Total 210Pb (46keV) activity (dpm/g) 214Pb (295keV) activity (dpm/g) 214Pb (351keV) activity (dpm/g) 214Bi (609keV) activity (dpm/g) 137Cs (661keV) activity (dpm/g) 7Be (477keV) activity (dpm/g) CRS Age dating (yrs) and MAR (g/cm2/yr) 210Pb and 234Th |Data were corrected for counting time, detector efficiency and varying geometry using the IAEA RGU-1 standards for calibration, as well as for the fraction of the total radioisotope measured yielding activity in dpm/g. CRS (Constant Rate of Supply) Model applied to assign a date to each individual sample and calculate LAR. LAR = linear accumulation rate (cm/yr) MAR (g/cm2/yr) = dry bulk density (g/cm3) x LAR (cm/yr) CRS (Constant Rate of Supply) Model applied to assign a date to each individual sample|Series HPGe (High-Purity Germanium) Coaxial Planar Photon Detectors||Peak error|
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Distribution info: Distribution: Distributor: Distributor: Distributor contact: Responsible party: Organisation name: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC) Position name: Contact info: Contact: Phone: Telephone: Voice: +1-361-825-3604 Facsimile: +1-361-825-2050 Address: Address: Delivery point: 6300 Ocean Drive Unit 5869 City: Corpus Christi Administrative area: Texas Postal code: 78412-5869 Country: USA Electronic mail address: griidc@gomri.org Online Resource: Online Resource: Linkage: URL: http://data.gulfresearchinitiative.org Protocol: Role: Role code: distributor Distributor format: Format: Name: Excel Spreadsheet Version: File decompression technique: Distributor transfer options: Digital transfer options: Transfer size: 5 Online: Online Resource: Linkage: URL: https://data.gulfresearchinitiative.org/data/Y1.x031.000:0003 Protocol:
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Metadata maintenance: Maintenance information: Maintenance and update frequency: Maintenance note: This ISO metadata record was created using the 'Check and Save to File' (with form validation) function of the GRIIDC ISO 19115-2 Metadata Editor on 2015-10-05T17:49:36+00:00
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