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W. Bohemia Museum Pilsen
ISSN: 1802-8225 (online),
The role of mafic magmatism in age specification of Devonian continental trough deposits: evidence from the Minusa Basin, western Siberia, Russia
Published in: Bulletin of Geosciences, volume 83, issue 4; pages: 473 - 480; Received 19 September 2006; Accepted in revised form 26 August 2008;
Keywords: Early Devonian, stratigraphy, geochronology, basalt, dolerite and porphyry sills, Minusa Basin, Russia,
AbstractIn the Devonian the Minusa Intermountain Trough (Basin) of Siberia represented a rift structure that was filled with rocks which now occur as strata-like bodies interpreted to be of volcanic origin. The character of the mafic rocks including their upper contacts and geochronological dating, using Rb/Sr, 40Ar/39Ar, and U/Pb methods, suggests their sill or subvolcanic nature. Porphyry and dolerite sills and basalt formed later (385-405 Mya) than felsic and andesitic volcanic rocks (402-448 Mya). Because these bodies were earlier considered as volcanic flows, it is important to revise the geological succession of the Devonian formations dominated by mafic igneous rocks
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