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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Potassium-Argon Dating of the Idaho Batholith
Paleogeography and the Source of Sediments of the Triassic Basin, New Jersey, by K-Ar Dating
Age of intrusion and ore deposition in the Robinson mining district of Nevada
Isotopic Evidence on the Origin of the Colorado Plateau Uranium Ores
Isotopic Age Study of the Metamorphic History of the Manhattan and Reading Prongs
Abstract The lead content of Precambrian carbonate rocks is about 1 part per million, and the U/Pb ratio is often much lower than that of average crustal rocks. Hence isotope studies on these rocks can provide information about lead in the environment in which these rocks formed. The measured lead-isotope ratios must be corrected for radiogenic lead produced from the trace quantities of uranium within the carbonates; correction for other sources of more radiogenic lead ( e.g. , ground water) is apparently unnecessary. Model ages based on the corrected 206/207 ratios of lead from ancient marbles of Southern Rhodesia and Finland are equal to or greater than the metamorphic ages of the samples. This model should provide reliable minimum ages for the time of sedimentation of carbonates.
Sulfur isotopes and ore deposits
Excess helium and argon in beryl and other minerals
AGE OF THE METAMORPHISM OF THE ROCKS OF THE MANHATTAN PRONG
Lead isotope composition of Peruvian galenas
URANIUM-LEAD METHOD OF AGE DETERMINATION: PART II: NORTH AMERICAN LOCALITIES
Origin of Gulf Coast Salt-Dome Sulphur Deposits
POTASSIUM-ARGON METHOD OF GEOCHRONOMETRY
Discordant U-PB Ages and Mineral Type
URANIUM-LEAD METHOD OF AGE DETERMINATION: PART I: LAKE ATHABASCA PROBLEM
Radon leakage from radioactive minerals
The intensive research on isotopic methods of age determination at a number of laboratories has produced new methods, advances in experimental techniques, and many additional measurements. These developments are reviewed with particular reference to the effect of the new age determinations on the geologic time scale. The age of the planet now appears to be about 4.5 billion years, and the oldest rocks about 3.5 billion. A large number of new measurements on Precambrian rocks provide a basis for interregional correlations. In general the post-Cambrian time scale remains unchanged, but new determinations certify the older ones and reduce the errors involved. The major problem of correlating the isotopic dates with the sedimentary column remains. The most promising leads in the solution of this problem lie in absolute age determination of intercalated volcanics and carbonaceous shales. Ages obtained from the various uranium-lead isotope ratios on pegmatite uraninite or samarskite are generally concordant, provided a correction for radon leakage is applied and the proper common lead correction is made. Under such conditions it is highly probable that a true age has been obtained. Where the apparent ages derived from these ratios do not agree, recrystallization with consequent lead loss is indicated. In the case of pitchblendes similar criteria apply; however, the ease of recrystallization, transportation, and redeposition complicates the interpretation of the apparent age derived from the measurements. Rubidium-strontium ages have been reported which appear too high. Reasons for these anomalies will be suggested. The potassium-argon method has been shown to be feasible during the last year. This may become the most useful of all isotopic chronometers.