A THREE-DIMENSIONAL METHOD FOR CALCULATING INDEPENDENT CHEMICAL U/PB- AND TH/PB-AGES OF ACCESSORY MINERALS

dc.contributor.author	Rhede D.
dc.contributor.author	Wendt I.
dc.contributor.author	Forster H.J.
dc.date.accessioned	2020-11-20T10:50:56Z
dc.date.available	2020-11-20T10:50:56Z
dc.date.issued	1996
dc.identifier	https://elibrary.ru/item.asp?id=431528
dc.identifier.citation	Chemical Geology, 1996, , 3, 247-253
dc.identifier.issn	0009-2541
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/19118
dc.description.abstract	Previous theoretical considerations on the chemical U-Th-total Pb dating method failed to distinguish between thorogenic and uranogenic lead. However, it can be shown that the data points are located on a plane in the three-dimensional ThO2, PbO, UO2 space. The calculation of the best-fit plane yields a slope in the ThO2-PbO and UO2-PbO coordinate projections, and an initial PbO value. From the two slopes, Th/Pb- and U/Pb-ages can be calculated independently.The method described in this paper is applied to monazites from the Hercynian G4-granite of the Fichtelgebirge (Germany). Th/Pb- and U/Pb-ages were calculated at 323 +/- 20 Ma and 304 +/- 15 Ma, respectively. The intercept value close to zero indicates that no significant amounts of common lead are present in the monazites studied.
dc.title	A THREE-DIMENSIONAL METHOD FOR CALCULATING INDEPENDENT CHEMICAL U/PB- AND TH/PB-AGES OF ACCESSORY MINERALS
dc.type	Статья

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