undetectable by WBC routine methods.
Major Descriptors: *HUMAN POPULATIONS -- RADIATION DOSES;
-- HUMAN POPULATIONS
Descriptors:
BIOASSAY;
PLUTONIUM 239;
90; URINE
CESIUM 137;
POTASSIUM 40;
COBALT 60;
FALLOUT;
*MARSHALL ISLANDS
NUCLEAR WEAPONS;
QUALITATIVE CHEMICAL ANALYSIS;
STRONTIUM
t
Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALKA; ALKALI METAL
ISOTOPES; ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; BETA
DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY
RADIOISOTOPES; BIOLOGICAL MATERIALS; BIOLOGICAL WASTES; BODY FLUIDS;
CESIUM ISOTOPES; CHEMICAL ANALYSIS; COBALT ISOTOPES; DOSES; ELECTRON
CAPTURE .RADIOISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI;
INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISLANDS;
ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LIGHT NUCLEI; MATERIALS;
MICRONESIA; MINUTES LIVING RADIOISOTOPES; NANOSEC LIVING RADIOISOTOPES;
NUCLEI; OCEANIA; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; PLUTONIUM ISOTOPES;
POPULATIONS; POTASSIUM ISOTOPES; RADIOISOTOPES; SPONTANEOUS FISSION
RADIOISOTOPES; STRONTIUM ISOTOPES; WASTES; WEAPONS; YEARS LIVING
RADIOISOT; YEARS LIVING RADIOISOTOPES
Subject Categories: 560101*
-- Biomedical Sciences, Applied Studies -Radiation Effects -- Dosimetry & Monitoring -- (1992-)
INIS Subject Categories: C5500*
-- Personnel Dosimetry & Monitoring
10/5/334
{Item 34 from file: 103)
03281422
EDB-92-044179
Title: ..delta.. sup 18 0 values, sup 87 Sr/ sup 86 Sr and Sr/Mg ratios of
Late Devonian abiotic marine calcite: Implications for the composition
of ancient seawater
Author(s): Carpenter, S.J.;
Lohmann, K.C.;
Walter, L.M.;
Huston, J.G.;
Halliday, A.N. (Univ. of Michigan, Ann Arbor (United States));
Holden,
P. (Univ. of California, Los Angeles (United States) )
Source: Geochimica et Cosmochimica Acta
(United States)
v 55:7.
Coden:
GCACA
ISSN: 0016-7037
Publication Date: Jul 1991
p 1991-2010
Document Type: Journal Article
Language: In English
Journal Announcement: EDB9207
Subfile:
ETD (Energy Technology Data Exchange).
US DOE Project/NonDOE Project: NP
JMT
(DOE contractor)
Country of Origin: United States
Country of Publication: United States
Abstract: Late Devonian (Frasnian) abiotic marine calcite has been
microsampled and analyzed for {sup 87}Sr/{sup 86}Sr ratios, {delta}{sup
18}0 and
{delta}{sup 13}C values,
and minor element
concentrations.
Portions of marine cement crystals from the Alberta and Canning Basins
have escaped diagenetic alteration and preserve original marine
{delta}{sup 18}0 values ({minus}4.8{per thousand} {plus minus} 0.5,
PDB), {delta}{sup 13}C values (+2.0 to +3.0{per thousand}, PDB), {sup
Leduc Formation preserve original marine {delta}{sup 18}0 values which
are 3 to 4{per thousand} lower than those of modern marine cements.
These low {delta}{sup 18}0 values are best explained by precipitation
from {sup 18}0-depleted seawater and not be elevated seawater
temperature or diagenetic alteration. For comparison with Devonian
data, analogous data were collected from Holocene Mg-calcite and
aragonite marine cements from Enewetak Atoll, Marshall Islands.
Mg-calcite and aragonite marine cements are in isotopic equilibrium
with ambient seawater, and Mg-calcite cements are homogeneous with
respect to Sr and Mg contents. Comparison of Sr and Mg contents of
analogous Devonian and Holocene marine cements suggests that the Mg/Ca
ratio of Late Devonian seawater was significantly lower and that the
Sr/Ca ratio was significantly higher than that of modern seawater.
9003630
87}Sr/{sup 86}Sr ratios (0.70805 {plus minus} 3), and Sr/Mg weight
ratios (0.04 to 0.05). Marine {sup 87}Sr/{sup 86}Sr ratios are globally
consistent and can be correlated within the Alberta Basin, and among
the Alberta, Canning, and Williston Basins. Correlation of isotopic and
chemical data strengthen the conclusion that marine cements from the