Caesium-137 profiles in the sediments of a partial-meromictic lake on Great Sandy Island (Fraser Island), Queensland, Australia

Longmore, M. E.; O'Leary, BM; Rose, C. W.

doi:10.1007/978-94-009-7290-2_4

Cited by 9 publications

(9 citation statements)

References 22 publications

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“…Three peaks in atmospheric precipitation of 137Cs have been documented in the southern hemisphere, in 1958, ]1964 and 1971, the latter being due to several French tests which occurred in the South Pacific after the International Test-ban Treaty had gone into effect (Longmore et al 1983). For example, ]physical or biological mixing of surface sediments might ]have reduced the 210pb activity at the top of a profile resulting in an anomalous 210pb distribution.…”

Section: Resultsmentioning

confidence: 99%

Development and erosion in the Brazilian Amazon: A geochronological case study

Forsberg

Marcus

Reynaldo³

et al. 1989

GeoJournal

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A 210pb chronology of sedimentation in a small floodplain lake in the Jamari river basin (Rondonia, Brazil) provided insight into the relationship between development and erosion in the Brazilian Amazon. Positive correlations between increased sedimentation in the lake and levels of deforestation and mining in the Jamari basin suggested a major increase in erosion associated with these activities. This increase in erosion could diminish agricultural yields in the basin and significantly reduce the useful life of a hydro-electric plant recently built on the river.

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Section: Resultsmentioning

confidence: 99%

Development and erosion in the Brazilian Amazon: A geochronological case study

Forsberg

Marcus

Reynaldo³

et al. 1989

GeoJournal

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“…As to the 137Cs dating, several recent papers have shown that it may give erroneous results due to the mobility of the isotope (e .g . Longmore et al, 1983 ;Davis et al, 1984) . In the present cases, the two independent isotope datings seem, however, to give consistent results, that also give a reasonable backbone for the paleolimnologic interpretations .…”

Section: Discussionmentioning

confidence: 99%

Effects of peatbog ditching in lakes: Problems in paleolimnological interpretation

Liehu

Sandman²,

Simola

1986

Hydrobiologia

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Recent sediment stratigraphy in two lakes with extensive artificial drainage of surrounding peatbogs was studied by 210 Pb and 137 Cs dating and chemical and diatom analyses . In contrast to many other lakes with similar ditching history, the visual appearance of the recent sediments in both of these lakes is homogeneous . In the larger lake, Kyyvesi, the sediment accumulation rate seems to have increased, but no major changes in the chemical properties or diatom stratigraphy are to be seen . In the organic dy sediment of Suuri-Rostuvi the ignition residue increases and there is a mass occurrence of Asterionella ralfsii, an acidophilic plankton diatom, clearly due to ditching and fertilization of the catchment bogs in 1970 . Mercury content is increased in both lakes in the sediment layer corresponding to the ditchings -more abruptly in Suuri-Rostuvi, up to 2 .4 µg g -' DW. In Kyyvesi a first Hg maximum was dated to the 1930's -possibly related to agricultural use of Hg as fungicide (seed dressing) in the large partly cultivated drainage area .The limnologic effects and stratigraphic manifestation of extensive peatbog ditching in geomorphically, geologically and hydrologically different drainage basins are discussed .

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“…The CIC was the most adequate model. The estimated age was validated with the peak in 137 Cs activity, which was observed around 1963, when large quantities of this isotope were released into the atmosphere from nuclear weapons tests (Longmore et al 1983). …”

Section: Geochronologymentioning

confidence: 95%

“…From 10 to 17 cm, the activity is not detectable. According to Longmore et al (1983), the peak in 137 Cs activity probably represents the year 1963, when this radioisotope was released in large quantities during nuclear weapons tests. There is good agreement between the 137 Cs and 210 Pb profiles.…”

Section: Physical Parametersmentioning

confidence: 99%