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- W2051478601 abstract "RbSr and KAr methods can be used for direct numerical chronostratigraphy of sediments using the clay silicates they contain. The interpretation of the ages calculated depends on the satisfaction of the following requirements: (1) The series studied must include diagenetic clay sediments. Coarsely-detrital or alightly-metamorphic formations must be excluded. Studies in progress concerning decarbonatation may lead to the application of direct dating of sediments being extended to carbonate sediments. (2) Careful mineralogical study of the clay minerals must prove early diagenetic recrystallization or new formation. This part of the study must precede any isotopic work. (3) The isotopic study must involve the use of both RbSr and KAr methods. The extreme sensibility of the KAr isotopic system to late diagenesis helps to choose between early or late diagenesis: a younger KAr age may generally be regarded as that of the late diagenesis, whereas the RbSr age may be that of the early diagenesis. (4) The initial 87Sr/86Sr isotopic ratio is not always a reliable criterion, owing to the effects of the dilution of the radiogenic 87Sr by the great amounts of primary Sr contained in carbonates. (5) The regularly-decreasing succession of isotopic ages must follow the stratigraphic succession. When this condition is satisfied, there is a high probability that the calculated ages are indeed those of the deposition dates." @default.
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- W2051478601 date "1982-05-01" @default.
- W2051478601 modified "2023-09-27" @default.
- W2051478601 title "The use of RbSr and KAr dating methods as a stratigraphic tool applied to sedimentary rocks and minerals" @default.
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- W2051478601 doi "https://doi.org/10.1016/0301-9268(82)90034-1" @default.
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