On the significance of crater ages: new ages for Dellen (Sweden) and Araguainha (Brazil).

Details On the significance of crater ages: new ages for Dellen (Sweden) and Araguainha (Brazil). On the significance of crater ages: new ages for Dellen (Sweden) and Araguainha (Brazil).

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992tectp.216..205d&link_type=abstract

Tectonophysics, Vol. 216, No. 1/2, p. 205 - 218

Physics

11

Scientific paper

Samples of a few grams in weight from the impact melt at the Dellen crater (Sweden) and the Araguainha dome (Brazil) were analyzed by Rb-Sr and Sm-Nd techniques. For Dellen, pure labradorite, orthopyroxene, and glass separates from a clast-free impact melt rock with holohyaline ground mass yield an internal Rb-Sr isochron with 89.0±2.7 Ma, compared to Ar-Ar plateau ages of 102±3.2 Ma and 109.6±2.0 Ma published for total melt rocks. The age of the Araguainha dome (Brazil) is bracketed by the Rb-Sr model age of 243±19 Ma, for altered cordierite in the impact melt, and by the internal Rb-Sr isochron age of 449±9 Ma, for an uplifted granite.

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