Item talk:Q301573
From geokb
{
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"@type": "Article",
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"name": "Uranium-series disequilibrium, sedimentation, diatom frustules, and paleoclimate change in Lake Baikal",
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"value": "10.1016/0012-821X(96)00085-4",
"url": "https://doi.org/10.1016/0012-821X(96)00085-4"
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"journal": {
"@type": "Periodical",
"name": "Earth and Planetary Science Letters",
"volumeNumber": "142",
"issueNumber": "1-2"
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"inLanguage": "en",
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"name": "Earth and Planetary Science Letters"
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"datePublished": "1996",
"dateModified": "2023-12-09",
"abstract": "The large volume of water, approximately one-fifth of the total surface fresh water on the planet, contained in Lake Baikal in southeastern Siberia is distinguished by having a relatively high concentration of uranium (ca. 2 nM), and, together with the surface sediments, an unusually high234U238U\u00a0alpha activity ratio of 1.95. About 80% of the input of uranium to the lake, with a234U238U\u00a0ratio of 2.0, comes from the Selenga River. Profiles of uranium, as well as the extent of isotopic disequilibrium in a 9 m sediment core collected on Academic Ridge, generally show high values during interglacial periods corresponding to high diatom frustule numbers (DiFr) and biogenic silica (BSi) data that have been reported elsewhere. During glacial periods (low DiFr and BSi), uranium progeny (234U and230Th) were in secular equilibrium with low concentrations of their parent238U. Radionuclide distributions were interpreted in terms of a quantitative model allowing for adsorption of riverine inputs of uranium onto two classes of sedimenting particles with differing238U232Th\u00a0ratios and uranium progeny in secular equilibrium. If the234U238U\u00a0activity ratio of adsorbed uranium has remained constant, mean sedimentation rates can be independently estimated as 3.6 \u00b1 0.6 and 3.7 \u00b1 0.9 cm \u00b7 kyr\u22121\u00a0for the decay of234U and in-growth of230Th, respectively. These rates are consistent with a mean rate of 3.76 cm \u00b7 kyr\u22121, calculated by optimization of the correspondence between adsorbed238U and \u03b418O in dated oceanic sediments. The adsorbed uranium apparently tracks variable river flow during interglacials and is drastically reduced during periods of glaciation. Evidently, uranium has not been significantly redistributed within Baikal sediments over at least the past 250 kyr and is a unique, biologically non-essential, tracer for climate-sensitive processes, which provide their own internal geochronometers, potentially useful for ages up to 1 Myr BP.",
"description": "14 p.",
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"name": "Elsevier"
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"author": [
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"name": "Orlandini, K.A.",
"givenName": "K.A.",
"familyName": "Orlandini"
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"name": "Edgington, D.N.",
"givenName": "D.N.",
"familyName": "Edgington"
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"name": "Robbins, J. A.",
"givenName": "J. A.",
"familyName": "Robbins"
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"@type": "Person",
"name": "Gustin, M.-P.",
"givenName": "M.-P.",
"familyName": "Gustin"
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"@type": "Person",
"name": "Colman, Steven M.",
"givenName": "Steven M.",
"familyName": "Colman",
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"@type": "Organization",
"name": "Woods Hole Coastal and Marine Science Center",
"url": "https://www.usgs.gov/centers/woods-hole-coastal-and-marine-science-center"
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