Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments

Steven A. Kuehl, Michael E Ketterer, Jennifer L. Miselis

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Sediment geochronology of coastal sedimentary environments dominated by sand has been extremely limited because concentrations of natural and bomb-fallout radionuclides are often below the limit of measurement using standard techniques. ICP-MS analyses of 239+240Pu from two sites representative of traditionally challenging (i.e., low concentration) environments provide a "proof of concept" and demonstrate a new application for bomb-fallout radiotracers in the study of sandy shelf-seabed dynamics. A kasten core from the New Zealand shelf in the Southern Hemisphere (low fallout), and a vibracore from the sandy nearshore of North Carolina (low particle surface area) both reveal measurable 239+240Pu activities at depth. In the case of the New Zealand site, independently verified steady-state sedimentation results in a 239+240Pu profile that mimics the expected atmospheric fallout. The depth profile of 239+240Pu in the North Carolina core is more uniform, indicating significant sediment resuspension, which would be expected in this energetic nearshore environment. This study, for the first time, demonstrates the utility of 239+240Pu in the study of sandy environments, significantly extending the application of bomb-fallout isotopes to coarse-grained sediments, which compose the majority of nearshore regions.

Original languageEnglish (US)
Pages (from-to)83-88
Number of pages6
JournalContinental Shelf Research
Volume36
DOIs
StatePublished - Mar 15 2012

Fingerprint

marine sediments
fallout
geochronology
marine sediment
sediments
sediment
shelf dynamics
radionuclides
nearshore environment
isotopes
surface area
resuspension
Southern Hemisphere
sand
radionuclide
energetics
sedimentation
isotope
methodology

Keywords

  • Pu
  • ICP-MS
  • New Zealand
  • North Carolina
  • Sediment geochronology
  • Shelf sands

ASJC Scopus subject areas

  • Aquatic Science
  • Geology
  • Oceanography

Cite this

Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments. / Kuehl, Steven A.; Ketterer, Michael E; Miselis, Jennifer L.

In: Continental Shelf Research, Vol. 36, 15.03.2012, p. 83-88.

Research output: Contribution to journalArticle

@article{f333ee91f27d4025bb7115f66fb3ddd2,
title = "Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments",
abstract = "Sediment geochronology of coastal sedimentary environments dominated by sand has been extremely limited because concentrations of natural and bomb-fallout radionuclides are often below the limit of measurement using standard techniques. ICP-MS analyses of 239+240Pu from two sites representative of traditionally challenging (i.e., low concentration) environments provide a {"}proof of concept{"} and demonstrate a new application for bomb-fallout radiotracers in the study of sandy shelf-seabed dynamics. A kasten core from the New Zealand shelf in the Southern Hemisphere (low fallout), and a vibracore from the sandy nearshore of North Carolina (low particle surface area) both reveal measurable 239+240Pu activities at depth. In the case of the New Zealand site, independently verified steady-state sedimentation results in a 239+240Pu profile that mimics the expected atmospheric fallout. The depth profile of 239+240Pu in the North Carolina core is more uniform, indicating significant sediment resuspension, which would be expected in this energetic nearshore environment. This study, for the first time, demonstrates the utility of 239+240Pu in the study of sandy environments, significantly extending the application of bomb-fallout isotopes to coarse-grained sediments, which compose the majority of nearshore regions.",
keywords = "Pu, ICP-MS, New Zealand, North Carolina, Sediment geochronology, Shelf sands",
author = "Kuehl, {Steven A.} and Ketterer, {Michael E} and Miselis, {Jennifer L.}",
year = "2012",
month = "3",
day = "15",
doi = "10.1016/j.csr.2012.01.016",
language = "English (US)",
volume = "36",
pages = "83--88",
journal = "Continental Shelf Research",
issn = "0278-4343",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments

AU - Kuehl, Steven A.

AU - Ketterer, Michael E

AU - Miselis, Jennifer L.

PY - 2012/3/15

Y1 - 2012/3/15

N2 - Sediment geochronology of coastal sedimentary environments dominated by sand has been extremely limited because concentrations of natural and bomb-fallout radionuclides are often below the limit of measurement using standard techniques. ICP-MS analyses of 239+240Pu from two sites representative of traditionally challenging (i.e., low concentration) environments provide a "proof of concept" and demonstrate a new application for bomb-fallout radiotracers in the study of sandy shelf-seabed dynamics. A kasten core from the New Zealand shelf in the Southern Hemisphere (low fallout), and a vibracore from the sandy nearshore of North Carolina (low particle surface area) both reveal measurable 239+240Pu activities at depth. In the case of the New Zealand site, independently verified steady-state sedimentation results in a 239+240Pu profile that mimics the expected atmospheric fallout. The depth profile of 239+240Pu in the North Carolina core is more uniform, indicating significant sediment resuspension, which would be expected in this energetic nearshore environment. This study, for the first time, demonstrates the utility of 239+240Pu in the study of sandy environments, significantly extending the application of bomb-fallout isotopes to coarse-grained sediments, which compose the majority of nearshore regions.

AB - Sediment geochronology of coastal sedimentary environments dominated by sand has been extremely limited because concentrations of natural and bomb-fallout radionuclides are often below the limit of measurement using standard techniques. ICP-MS analyses of 239+240Pu from two sites representative of traditionally challenging (i.e., low concentration) environments provide a "proof of concept" and demonstrate a new application for bomb-fallout radiotracers in the study of sandy shelf-seabed dynamics. A kasten core from the New Zealand shelf in the Southern Hemisphere (low fallout), and a vibracore from the sandy nearshore of North Carolina (low particle surface area) both reveal measurable 239+240Pu activities at depth. In the case of the New Zealand site, independently verified steady-state sedimentation results in a 239+240Pu profile that mimics the expected atmospheric fallout. The depth profile of 239+240Pu in the North Carolina core is more uniform, indicating significant sediment resuspension, which would be expected in this energetic nearshore environment. This study, for the first time, demonstrates the utility of 239+240Pu in the study of sandy environments, significantly extending the application of bomb-fallout isotopes to coarse-grained sediments, which compose the majority of nearshore regions.

KW - Pu

KW - ICP-MS

KW - New Zealand

KW - North Carolina

KW - Sediment geochronology

KW - Shelf sands

UR - http://www.scopus.com/inward/record.url?scp=84857794856&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84857794856&partnerID=8YFLogxK

U2 - 10.1016/j.csr.2012.01.016

DO - 10.1016/j.csr.2012.01.016

M3 - Article

AN - SCOPUS:84857794856

VL - 36

SP - 83

EP - 88

JO - Continental Shelf Research

JF - Continental Shelf Research

SN - 0278-4343

ER -