Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Pu240+239 DEPOSITIONAL SIGNATURES AS A VIABLE GEOCHRONOLOGICAL TOOL IN THE AMAZON BASIN
Southern Cross University, Australia.
Southern Cross University, Australia.
Southern Cross University, Australia.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. University of Federal Rio de Janeiro, Brazil.
Show others and affiliations
2017 (English)In: Geochronometria, ISSN 1733-8387, E-ISSN 1897-1695, Vol. 44, no 1, p. 142-149Article in journal (Refereed) Published
Abstract [en]

Anthropogenic radionuclide signatures associated with nuclear testing are increasingly utilized in environmental science to explore recent sedimentation. In this study, we assess the suitability of Pu radioisotope analysis in floodplain lake environments in the Amazon Basin to form geochronologies during the 20th century. The Pu-240 + Pu-239 (Pu240+239) signatures in six sediment cores indicate sediment accumulation rates in the floodplain lakes of the major rivers; Amazon (2.3 mm year(-1)), Tapajos (10.2 and 2.4 mm year(-1)) and Madeira (3.4, 4.2 and 6.2 mm year(-1)). The results from this study show that Pu240+239 fallout activities, and the well documented (Pu-240/Pu-239) atomic ratios of the above ground nuclear tests which began in the 1950s, are sufficient and well preserved in Amazon flood-plain lake sediments to infer chronologies. Lead-210 dating analyses in the same sediment cores produced comparable sediment accumulation rates at three of the six sites. The differences between dating methods may be attributed to the different time scale these dating methods represent and/or in the solubility between Pb and Pu along the sediment column. The geochronologies derived from the Pu240+239 and Pb-210 methods outlined in this work are of interest to identify the effects of changing sediment accumulation rates during the previous century as a result of development, including deforestation, along the Amazon Basin which increased towards the middle of the 20th century. This study shows that Pu dating provides a viable alternative geochronology tool for recent sediment accumulation (previous similar to 60 years) along the Amazon Basin.

Place, publisher, year, edition, pages
DE GRUYTER OPEN LTD , 2017. Vol. 44, no 1, p. 142-149
Keywords [en]
plutonium dating; geochronology; Amazon floodplain lakes; sedimentation
National Category
Geology
Identifiers
URN: urn:nbn:se:liu:diva-144285DOI: 10.1515/geochr-2015-0068ISI: 000418580000009OAI: oai:DiVA.org:liu-144285DiVA, id: diva2:1173605
Note

Funding Agencies|APA scholarship; IPRS scholarship; Australian Research Council [DE160100443, DP150103286, LE140100083]; CNPq; FAPERJ; CAPES

Available from: 2018-01-12 Created: 2018-01-12 Last updated: 2018-01-31

Open Access in DiVA

fulltext(1036 kB)17 downloads
File information
File name FULLTEXT01.pdfFile size 1036 kBChecksum SHA-512
4ff329f12246f233e654e85fe912638696f3557fbf0f6dcef16d6e167f2a0577cccd59b04c942b35a3c8e42f8193a216f457d26f332a401d077f07e06d56ad57
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Enrich Prast, Alex
By organisation
Tema Environmental ChangeFaculty of Arts and Sciences
In the same journal
Geochronometria
Geology

Search outside of DiVA

GoogleGoogle Scholar
Total: 17 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 37 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf