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- W2025173631 abstract "Abstract Radiometric ages of some late Precambrian rocks in south-western Sweden show that the evolution of the Sveconorwegian geochronological province in this area, after the deposition of the Dal Group between 1100 and 1050 Ma (million years) ago, continued for at least about 250 Ma. The Bohus granite intruded in a late-tectonic phase, giving a Rb-Sr isochron age of 910 ± 35 Ma (λ87Rb = 1.39 × 10−11α−1) with an initial strontium-isotope ratio of 0.711. The K–Ar model ages determined on micas separated from the Bohus granite, lie in the range of 861 to 680 Ma. A Rb-Sr isochron age of 1050 ± 40 Ma with an intercept of 0.704 has been obtained for the slate of the Dal Group. The significance of this age is discussed. The K–Ar model ages, determined on whole rocks and minerals from slates and spilites of this sequence, range from 1000 to 715 Ma. The pre-Sveconorwegian granites in the Ljungbergen area yield a Rb-Sr isochron age of 1400 ± 80 Ma with an intercept of 0.704, which probably reflects the age of intrusion. Further evidence of igneous activity during this time is manifested by a Rb-Sr isochron age of 1405 ± 40 Ma, intercepting at 0.708, for granites intersecting the Ellenö supracrustals. A Rb-Sr diagram plotting of granites, formerly reported to be intrusive, in the Härserud area shows a discordant pattern, indicating that metasomatic changes in the rock system seem to have occurred. Isotope analyses and field observations do not favour the theory of an intrusion in situ but an overthrust of the old basement upon the Dal Group." @default.
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- W2025173631 date "1976-03-31" @default.
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- W2025173631 title "The interpretation of the Rb-Sr and K-Ar ages of late Precambrian rocks in south-western Sweden" @default.
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- W2025173631 doi "https://doi.org/10.1080/11035897609454335" @default.
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