Physics
Scientific paper
Aug 1958
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958gecoa..14..105m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 14, Issue 1-2, pp.105-113
Physics
3
Scientific paper
The age of 14 samples of variscian and prevariscian rocks of the Black Forest (Southern Germany) has been measured by means of the K-A-method. The samples were taken in order of their petrogenetic sequence, which was known from previous petrographic work. The accuracy and precision of the method has been discussed for some granites, pegmatites and porphyries of known age (lower/upper Carboniferous).The determined age of the metamorphic and granitized rocks depends on the time of the first formation of the original rock (i.e. sedimentary educt of paragneisses) but is strongly influenced by the age and intensity of the regional granitization (loss of A). This age has been determined as early-variscian. The age of the sedimentary educt is probably Pre-cambrian.
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