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40Ar-39Ar ages of scandinavian impact structures: I Mien and Siljan

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Abstract

40Ar-39Ar ages have been obtained on samples of impact melt from the Lake Mien and Siljan hypervelocity impact structures in Sweden. Two samples of “rhyolite” from Lake Mien yield a plateau age of 118.7±2.3 m.y., which is consistent with earlier conventional K-Ar results. Two melt samples from a dikelet in the central granite of Siljan have an integrated age of 361.9±1.1 m.y.

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Authors and Affiliations

  1. Department of Physics, University of Toronto, M5S 1A7, Toronto, Ontario, Canada

    R. J. Bottomley & D. York

  2. Dept. Energy, Mines and Resources, Earth Physics Branch, K1A OY3, Ottawa, Ontario, Canada

    R. A. F. Grieve

Authors
  1. R. J. Bottomley
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  2. D. York
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  3. R. A. F. Grieve
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Contribution from the Earth Physics Branch No. 743

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Bottomley, R.J., York, D. & Grieve, R.A.F. 40Ar-39Ar ages of scandinavian impact structures: I Mien and Siljan. Contr. Mineral. and Petrol. 68, 79–84 (1978). https://doi.org/10.1007/BF00375448

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  • DOI: https://doi.org/10.1007/BF00375448

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