Rb-Sr systematics of rocks related to the Ries Crater, Germany

Details Rb-Sr systematics of rocks related to the Ries Crater, Germany Rb-Sr systematics of rocks related to the Ries Crater, Germany

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..75..384h&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 75, no. 4, Nov. 1985, p. 384-392.

Computer Science

10

Bedrock, Craters, Petrology, Rubidium Isotopes, Sediments, Strontium Isotopes, Bentonite, Geochronology, Geomorphology, Moldavite

Scientific paper

Rb-Sr whole rock/biotite ages of crystalline basement rocks from Ries Crater are 323 + or - 8 Ma; initial Sr-87/Sr-86 ratios are 0.7081 + or - 0.0007. These values compare perfectly with those for Modanubian rocks exposed in the Bayerischer Wald and Schwarzwald. It is demonstrated that impact-related shock pressures up to 15 GPa and temperatures as high as 300 C did not disturb the Rb-Sr isotopic systems of the rocks. Comparison of Sr isotropic compositions of Tertiary Upper Freshwater Molasse sediments with those of moldavites suggests that such sediments can be regarded as source material of these tektites. Data for components of the sediments show that a mixture of clay (weathered crystalline rocks) and secondary carbonates, in addition to detrital quartz, can explain the observed range of Sr-87/Sr-86 ratios in moldavites. A similar comparison of modavites with bentonites from the Tertiary molasse definitely rules out a genetical relationship between these two materials. The liquid/gas-filled bubbles in bentonite glasses are regarded as proof of their volcanic nature.

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