First data on age of metarhyolites from the Turan Group of the Bureya Terrane, eastern part of the Central Asian Foldbelt |
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Authors: | A A Sorokin Yu V Smirnov Yu N Smirnova and N M Kudryashov |
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Abstract: | The U-Pb geochronological studies showed that metarhyolites from the Turan Group of the Bureya (Turan) Terrane to the east
of the Central Asian Foldbelt are Middle Cambrian (504 ± 8 Ma), not Neoproterozoic in age, as was suggested before. Metarhyolites
are younger than the Early Cambrian terrigenous-carbonate sediments from this terrane characterized by the Atdabanian archaeochyatid.
Considering that volcanic rocks have features of intraplate origin, it may be assumed that their formation corresponds to
the breakup of the Early Paleozoic passive continental margin. |
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