Variations in the isotopic composition of common lead and the history of the crust of the earth

Bate, George L.; Kulp, J. Laurence

doi:10.2172/4340995

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…The main drawbacks are the large sample consumption (30-50 mg PbJ 2 ) and some uncertainty in the corrections necessary to transform the Pb(CH 3 ) 3 + values to Pb values. The most important correction is for the combined C 13 and hydride effect (Bate & Kulp 1955), that seems to vary 5-10 % from sample to sample. In certain samples we have been forced to extrapolate the corrections from neighbouring standard samples.…”

Section: Analytical Procedures and Methods Of Calculationmentioning

confidence: 99%

Age measurements on radioactive minerals from Sweden

Welin

Blomqvist

1964

Geologiska Föreningen i Stockholm Förhandlingar

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Section: Analytical Procedures and Methods Of Calculationmentioning

confidence: 99%

Age measurements on radioactive minerals from Sweden

Welin

Blomqvist

1964

Geologiska Föreningen i Stockholm Förhandlingar

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“…A most valuable and stimulating contribution by Bate and Kulp (1955) is now available. The authors present a wealth of new isotopic analyses for ore-leads.…”

Section: Estimates Based On Meteoritic Leadsmentioning

confidence: 99%

“…But only matters relevant to the nature and age of the source of lead ores need be considered here. Bate and Kulp (1955) are the only workers in this field who have attempted to calculate the age of the earth on the basis of a model which "allows for continuous differentiation of the crust *' from an original composition represented by chondrites to one like that of granitic rocks. The exponential treatment adopted (implying that systematically less granitising material from the mantle has been supplied to the crust as time has gone on) yields a value of about 5,300 m.y.…”

Section: -3-4-3 4-0 4-0 -4-9mentioning

confidence: 99%

“…But some or even most of the leads of certain ore provinces are anomalous, e.g. Mississippi Valley (Bate and Kulp, 1955); Sudbury ; and Lake Athabasca (Eckelmann and . In these cases some process is invoked such as extraction of lead from a crustal block in which older lead ores, or an unusual abundance of uranium and thorium already existed; or preferential extrac tion of radiogenic lead from mineral boundaries.…”

Section: -3-4-3 4-0 4-0 -4-9mentioning

confidence: 99%

“…Ivigtut) have isotopic compositions of the kind that would be expected if older lead deposits (with smaller values for the 206, 207 and 208 isotopes) had formed part of the source materials. Bate and Kulp (1955) have pro posed alternative explanations for these two types of abnor malities. It is known that uranium and thorium, and therefore radiogenic lead, tend to be concentrated towards and along the intergranular surfaces between the minerals of rocks such as granite.…”

mentioning

confidence: 99%

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How old is the earth?

Holmes¹

1956

TRNED

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The advances made during the last decade in estimating the time that has elapsed since the original material of the earth became differen tiated into crust, mantle and core are briefly reviewed. The earlier estimates (3,300-3,500 m.y.) based on the isotopic compositions of lead from galenas of known age are now replaced by one of about 4,500 m.y., as a result of the steadily increasing wealth of available data. Patterson and his co-workers have found that the proportions of lead isotopes (to lead-204) in lead from iron meteorites are lower than those in lead from any other known source. Adopting such lead as primeval, Patterson finds that both meteorites and the earth have essentially the same age, 4,550 ± 70 m.y. Using a series of leads ranging in age from the present to over 2,900 m.y. ago, I find 4,500 ±100 m.y. for the time since primary differentiation. Using only Palaeozoic and younger leads, Russell and Allan reach an estimate of 4,300 ±400 m.y. Possible differences between meteorites and the earth in age and primeval-lead composition are discussed, and reasons are given for thinking that the sialic crust seems to be a more likely source of lead ores than the ultrabasic material of the underlying mantle.

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Evolution of uranogenic and thorogenic lead, 1. A dynamic model of continuous isotopic evolution

Amov

1983

Earth and Planetary Science Letters

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Variations in the isotopic composition of common lead and the history of the crust of the earth

Cited by 11 publications

References 9 publications

Age measurements on radioactive minerals from Sweden

Age measurements on radioactive minerals from Sweden

How old is the earth?

Evolution of uranogenic and thorogenic lead, 1. A dynamic model of continuous isotopic evolution

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