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Determination of the sedimentation rates in the Sepetiba bay northeastern area by using dating with the excesses {sup 210} Pb radioisotope; Determinacao das taxas de sedimentacao na porcao nordeste da baia de Sepetiba utilizando datacao com o radioisotopo {sup 210} Pb em excesso

Abstract

{sup 210} Pb dating, using two modes of data analysis, CIC and CRS, was used to determine sedimentation in the North East part of Sepetiba Bay. {sup 210} Pb was leached from samples using dilute HBr and subsequently separated onto anionic exchange columns, followed by re-extraction and precipitation as Pb CrO{sub 4}. The original method was modified by the introduction of a pre-digestion step whose purpose was to liberate the lead bound as sulphide. The sedimentation rates found o.68 - 0.98 cm.y{sup -1} were moderate, compared to other authors estimates. Dating using the CRS model showed a maximum rate of sedimentation in the period between 1954 and 1977, when the riverine input was probably at its greatest. The CRS model appears to be more applicable to the data, since it works over longer periods and allows for variations in sedimentation rate. (author)
Publication Date:
Jul 01, 1996
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-3797
Reference Number:
EDB-01:018882
Resource Relation:
Other Information: TH: Tese (M.Sc.); 76 refs., 24 figs., 10 tabs; PBD: 1996
Subject:
58 GEOSCIENCES; AGE ESTIMATION; BRAZIL; DATA ANALYSIS; ISOTOPE DATING; LEAD; LEAD 210; RADIOACTIVE MATERIALS; RADIOISOTOPES; SEDIMENTATION; SEDIMENTS
OSTI ID:
20136209
Research Organizations:
Universidade Federal Fluminense, Niteroi, RJ (Brazil). Pos-Grarduacao em Geociencias
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR01B0860005640
Availability:
Available from INIS in electronic form
Submitting Site:
BRN
Size:
93 pages
Announcement Date:
Mar 02, 2001

Citation Formats

Forte, Cristiane Maria Sampaio. Determination of the sedimentation rates in the Sepetiba bay northeastern area by using dating with the excesses {sup 210} Pb radioisotope; Determinacao das taxas de sedimentacao na porcao nordeste da baia de Sepetiba utilizando datacao com o radioisotopo {sup 210} Pb em excesso. Brazil: N. p., 1996. Web.
Forte, Cristiane Maria Sampaio. Determination of the sedimentation rates in the Sepetiba bay northeastern area by using dating with the excesses {sup 210} Pb radioisotope; Determinacao das taxas de sedimentacao na porcao nordeste da baia de Sepetiba utilizando datacao com o radioisotopo {sup 210} Pb em excesso. Brazil.
Forte, Cristiane Maria Sampaio. 1996. "Determination of the sedimentation rates in the Sepetiba bay northeastern area by using dating with the excesses {sup 210} Pb radioisotope; Determinacao das taxas de sedimentacao na porcao nordeste da baia de Sepetiba utilizando datacao com o radioisotopo {sup 210} Pb em excesso." Brazil.
@misc{etde_20136209,
title = {Determination of the sedimentation rates in the Sepetiba bay northeastern area by using dating with the excesses {sup 210} Pb radioisotope; Determinacao das taxas de sedimentacao na porcao nordeste da baia de Sepetiba utilizando datacao com o radioisotopo {sup 210} Pb em excesso}
author = {Forte, Cristiane Maria Sampaio}
abstractNote = {{sup 210} Pb dating, using two modes of data analysis, CIC and CRS, was used to determine sedimentation in the North East part of Sepetiba Bay. {sup 210} Pb was leached from samples using dilute HBr and subsequently separated onto anionic exchange columns, followed by re-extraction and precipitation as Pb CrO{sub 4}. The original method was modified by the introduction of a pre-digestion step whose purpose was to liberate the lead bound as sulphide. The sedimentation rates found o.68 - 0.98 cm.y{sup -1} were moderate, compared to other authors estimates. Dating using the CRS model showed a maximum rate of sedimentation in the period between 1954 and 1977, when the riverine input was probably at its greatest. The CRS model appears to be more applicable to the data, since it works over longer periods and allows for variations in sedimentation rate. (author)}
place = {Brazil}
year = {1996}
month = {Jul}
}