Abstract:
This dataset contains short-lived radioisotope (SLRad) data collected aboard R R/V Weatherbird II cruise WB-0717 in the Gulf of Mexico from 2017-07-22 to 2017-07-28. SLRad data were generated for selected core sub-samples at 2mm sampling intervals for “surficial unit” and 5mm sampling resolution intervals to the base of cores. SLRad data generated include sample activity as disintegrations per minute per gram(dpm/g) of 1) Excess Thorium-234 (234Thxs) activity, which is calculated by measuring the total Thorium-234 (234ThTot) activity and the subtraction of the measured or estimated “supported” Thorium-234 (234ThSup) activity, 2) Excess Lead-210 (210Pbxs) activity, which is calculated by measuring the total Lead-210 (210PbTot) activity and subtraction of the measured background "supported" Lead-210 (210PbSup) activity {average of Lead-214 (214Pb) at 295 kiloelectron volts (keV), 214Pb at 351keV, and Bismuth-214 (214Bi) at 609keV}, 3) Cesium-137 (137Cs) activity, and 4) Berilium-7 (7Be) activity. Cruise documentation was provided for cruise WB-0717. The cruise was led by chief scientists Dr. Steve Murawski and Dr. David Hollander.
Suggested Citation:
Brooks, Gregg R.; Larson, Rebekka. 2019. Short-lived radioisotope (SLRad) data collected aboard R/V Weatherbird II cruise WB-0717 in the Gulf of Mexico from 2017-07-22 to 2017-07-28. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-e4ky-kx88
Data Parameters and Units:
Water depth of core site (m), core collection date (MM/DD/YYYY), site identification (ID), sediment core identification (ID), top depth of interval (mm), bottom depth of interval (mm), average depth of interval (mm), 210Pb (Lead) total (dpm/g), 210Pb (Lead) total error (dpm/g), 234Th (Thorium) Total (dpm/g), 234Th (Thorium) error (dpm/g), re-Analysis of 234Th (Thorium) activity (dpm/g) represent 234ThSup (“supported” Thorium), re-Analysis of 234Th (Thorium) activity error (dpm/g) represent 234ThSup (“supported” Thorium), 137Cs (Caesium) activity (dpm/g), 137Cs (Caesium) activity error (dpm/g), 7Be (Berilium) activity (dpm/g), 7Be (Berilium) activity error (dpm/g), 214Pb (Lead, 295 keV) activity (dpm/g), 214Pb (Lead, 295 keV) activity error (dpm/g), 214Pb (Lead, 351 keV) activity (dpm/g), 214Pb (Lead, 351 keV) activity error (dpm/g), 214Bi (Bismuth) activity (dpm/g), 214Bi (Bismuth) activity error (dpm/g), 210PbSup (“supported” Lead) activity (dpm/g), 210PbSup (“supported” Lead) activity error (dpm/g), 210Pbxs (Excess Lead) activity (dpm/g), 210Pbxs (Excess Lead) activity error (dpm/g), decay corrected 210Pbxs (Excess Lead) activity (dpm/g), decay corrected 210Pbxs (Excess Lead) activity error (dpm/g), 234Thxs (Excess Thorium) activity (dpm/g), 234Thxs (Excess Thorium) activity error (dpm/g), decay corrected 234Thxs (Excess Thorium) activity (dpm/g), decay corrected 234Thxs (Excess Thorium) activity error (dpm/g), laboratory/facility where analysis was performed: Eckerd College, St. Petersburg, Florida. Blank cell denotes no analysis performed.
Methods:
The cores were extruded in the laboratory and the sediment core preservation was not required for this analysis. Samples were analyzed for short-lived radioisotopes by gamma spectrometry on Series HPGe (High-Purity Germanium) Coaxial Planar Photon Detectors. The detail methods on short-lived radioisotope geochronology can be found at Larson et al., 2018.
Provenance and Historical References:
Larson, R. A., Brooks, G. R., Schwing, P. T., Holmes, C. W., Carter, S. R., & Hollander, D. J. (2018). High-resolution investigation of event driven sedimentation: Northeastern Gulf of Mexico. Anthropocene, 24, 40–50. doi:10.1016/j.ancene.2018.11.002
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