Quantifying K, U, and Th contents of marine sediments using shipboard natural gamma radiation spectra measured on DV JOIDES Resolution

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doi: 10.1002/2016GC006715
Author(s): de Vleeschouwer, David; Dunlea, Ann G.; Auer, Gerald; Anderson, Chloe H.; Brumsack, Hans; de Loach, Aaron; Gurnis, Michael; Huh, Youngsook; Ishiwa, Takeshige; Jang, Kwangchul; Kominz, Michelle A.; März, Christian; Schnetger, Bernhard; Murray, Richard W.; Palike, Heiko
Author Affiliation(s): Primary:
University of Bremen, Center for Marine Environmental Science, Bremen, Germany
Boston University, United States
Woods Hole Oceanographic Institution, United States
University of Graz, Austria
University of Oldenburg, Germany
Texas A&M University, United States
California Institute of Technology, United States
Seoul National University, South Korea
University of Tokyo, Japan
Western Michigan University, United States
University of Leeds, United Kingdom
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 18(3), p.1053-1064. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 32 refs.; illus., incl. sketch map
Summary: During International Ocean Discovery Program (IODP) expeditions, shipboard-generated data provide the first insights into the cored sequences. The natural gamma radiation (NGR) of the recovered material, for example, is routinely measured on the ocean drilling research vessel DV JOIDES Resolution. At present, only total NGR counts are readily available as shipboard data, although full NGR spectra (counts as a function of gamma-ray energy level) are produced and archived. These spectra contain unexploited information, as one can estimate the sedimentary contents of potassium (K), thorium (Th), and uranium (U) from the characteristic gamma-ray energies of isotopes in the 40K, 232Th, and 238U radioactive decay series. Dunlea et al. (2013) quantified K, Th, and U contents in sediment from the South Pacific Gyre by integrating counts over specific energy levels of the NGR spectrum. However, the algorithm used in their study is unavailable to the wider scientific community due to commercial proprietary reasons. Here, we present a new MATLAB algorithm for the quantification of NGR spectra that is transparent and accessible to future NGR users. We demonstrate the algorithm's performance by comparing its results to shore-based inductively coupled plasma-mass spectrometry (ICP-MS), inductively coupled plasma-emission spectrometry (ICP-ES), and quantitative wavelength-dispersive X-ray fluorescence (XRF) analyses. Samples for these comparisons come from eleven sites (U1341, U1343, U1366-U1369, U1414, U1428-U1430, and U1463) cored in two oceans during five expeditions. In short, our algorithm rapidly produces detailed high-quality information on sediment properties during IODP expeditions at no extra cost. Abstract Copyright (2017), . The Authors.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Actinides; Alkali metals; Bering Sea; Bowers Ridge; Costa Rica Seismogenesis Project; Data processing; East China Sea; East Pacific; Expedition 323; Expedition 329; Expedition 344; Expedition 346; Expedition 352; Gamma-ray spectra; ICP mass spectra; IODP Site U1341; IODP Site U1343; IODP Site U1366; IODP Site U1367; IODP Site U1368; IODP Site U1369; IODP Site U1414; IODP Site U1429; IODP Site U1430; IODP Site U1440; IODP Site U1463; Integrated Ocean Drilling Program; International Ocean Discovery Program; JOIDES; Japan Sea; MATLAB; Marine sediments; Mass spectra; Metals; North Pacific; Northeast Pacific; Northwest Pacific; Pacific Ocean; Potassium; Sediments; South Pacific; Southeast Pacific; Spectra; Thorium; Trace elements; Ulleung Basin; Uranium; West Pacific; X-ray analysis; X-ray fluorescence
Record ID: 2017060797
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom, Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union

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