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- W2259194961 abstract "A study of young, phanerozoic and ancient cherts was conducted to determine Rb, Sr, Sm and Nd concentrations and the associated isotopic systematics. It was found that both young and old marine and fresh water cherts have enrichment of Rb over Sr, leading to f(Rb/Sr) values ranging from 2 to 670. These high enrichments are apparently due to coupled X/sup +/, Al/sup +3/ - Si/sup +4/ substitutions in the lattice. Eocene marine samples have /epsilon//sub Sr/ close to seawater at that time. f(Sm/Nd) and /epsilon//sub Nd/ values for young samples are like the respective surface seawater in the Pacific and Atlantic Oceans. Cherts from the Onverwacht fm (3.5 AE) were studied and show /sup 87/Sr//sup 86/Sr values up to 7.04. Exchange of Sr in the cherts with associated carbonates appears rather limited. Seven of these samples define an excellent correlation line with a slope of 0.03095 and an initial /sup 87/Sr//sup 86/Sr ratio of 0.7206, indicating that, in the Onverwacht fm., the time of chert recrystallization was 2.15 AE and that the chert had accumulated radiogenic SR over 1.35 AE prior to its metamorphism and remobilization. For the Nd isotopic system, only one sample showed a wide range in f(Sm/Nd)more » and gives an age in approximate agreement with the Rb-Sr system. Because of the large Rb enrichment, it now appears possible to directly date the time of deposition or diagenesis of cherts and perhaps the crystallization of igneous quartz using available dating methods.« less" @default.
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- W2259194961 date "1985-01-01" @default.
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- W2259194961 title "/sup 87/Rb-/sup 86/Sr age determination on cherts" @default.
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