3,800-Myr granitic gneiss in south-western Minnesota

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WE have previously arrived at an age of 3,550 Myr for granitic1 gneiss in the vicinities of Morton and Montevideo in the Minnesota River valley, south-western Minnesota. We now report new Rb–Sr analyses (Table 1) and an age of 3,800 Myr for the fine grained foliated phase of the Montevideo Gneiss of Lund2. The rocks have undergone a complex history of metamorphism which remains to be deciphered, but the age determinations reveal that the geological mapping and previous interpretations did not provide a proper basis for sampling.

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  1. 1

    Goldich, S. S., Hedge, C. E., and Stern, T. W., Bull. geol. Soc. Am., 81, 3671 (1970).

  2. 2

    Lund, E. H., Bull. geol. Soc. Am., 67, 1475 (1956).

  3. 3

    Black, L. P., Gale, N. H., Moorbath, S., Pankhurst, R. J., and McGregor, V. R., Earth planet Sci. Lett., 12, 245 (1971).

  4. 4

    Moorbath, S., O'Nions, R. K., Pankhurst, R. J., Gale, N. H., and McGregor, V. R., Nature, 240, 78 (1972).

  5. 5

    Moorbath, S., O'Nions, R. K., and Pankhurst, R. J., Nature, 245, 138 (1973).

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GOLDICH, S., HEDGE, C. 3,800-Myr granitic gneiss in south-western Minnesota. Nature 252, 467–468 (1974) doi:10.1038/252467a0

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