Mass spectrometric sup 230 Th- sup 234 U- sup 238 U dating of the Devils Hole calcite vein

The Devils Hole calcite vein contains a long-term climatic record, but requires accurate chronologic control for its interpretation. Mass-spectrometric U-series ages for samples from core DH-11 yielding {sup 230}Th ages with precisions ranging from less than 1,000 years (2{sigma}) for samples younge...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1992-10, Vol.258:5080
Main Authors: Ludwig, K.R., Simmons, K.R., Szabo, B.J., Riggs, A.C., Winograd, I.J., Landwehr, J.M., Hoffman, R.J.
Format: Article
Language:English
Subjects:
290301 - Energy Planning & Policy- Environment, Health, & Safety- Regional & Global Environmental Aspects- (1992-)
540110
ACTINIDE ISO
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
AGE ESTIMATION
ALPHA DECAY RADIOISOTOPES
CALCITE
CARBONATE MINERALS
CLIMATIC CHANGE
ENERGY PLANNING, POLICY AND ECONOMY
ENVIRONMENTAL SCIENCES
EVEN-EVEN NUCLEI
HEAVY ION DECAY RADIOISOTOPES
HEAVY NUCLEI
ISOTOPE DATING
ISOTOPES
MAGNESIUM 28 DECAY RADIOISOTOPES
MASS SPECTROSCOPY
MINERALS
MONITORING
NEON 24 DECAY RADIOISOTOPES
NUCLEI
RADIOISOTOPES
SPECTROSCOPY
SPONTANEOUS FISSION RADIOISOTOPES
THORIUM 230
THORIUM ISOTOPES
URANIUM 234
URANIUM 238
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
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Summary:The Devils Hole calcite vein contains a long-term climatic record, but requires accurate chronologic control for its interpretation. Mass-spectrometric U-series ages for samples from core DH-11 yielding {sup 230}Th ages with precisions ranging from less than 1,000 years (2{sigma}) for samples younger than {approximately}140 ka (thousands of years ago) to less than 50,000 years for the oldest samples ({approximately}566 ka). The {sup 234}U/{sup 238}U ages could be determined to a precision of {approximately}20,000 years for all ages. Calcite accumulated continuously from 566 ka until {approximately}60 ka at an average rate of 0.7 millimeter per 10{sup 3} years. The precise agreement between replicate analyses and the concordance of the {sup 230}Th/{sup 238}U and {sup 234}U/{sup 238}U ages for the oldest samples indicate that the DH-11 samples were closed systems and validate the dating technique in general.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.258.5080.284