DOI: 10.5593/sgem2017/11/S01.064


M.L. Nutu-Dragomir
Saturday 9 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7105-98-8 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 11, 503-514 pp, DOI: 10.5593/sgem2017/11/S01.064


The Permian sedimentary succession exposed in Sirinia Basin (South Carpathians, Romania) provides a record of mixed siliciclastic-volcanic rocks. The siliciclastic rocks are represented by conglomerate, sandstone and claystone, which are grouped into nine lithofacies (Gmm/mg, St, Sh, Sm, Sr, Fl, Fr, P) occur in a predictable order as repeated fining-upward cycles. Groups of associated facies are arranged into five distinct architectural elements (gravel channels, ribbon-channel, sandy channels, laminated sand sheets and overbank deposits), which is consistent with a fluvial origin of the succession. The types of architectural elements present and their relationship to each other demonstrate that Permian succession from Sirinia Basin preserves a record of a meandering or a braided river. The entire Permian sedimentary succession from Sirinia Basin has developed into an extensional tectonic realm, where the sedimentation was controlled by two major factors: (i) a tectonically active source area, which provided Precambrian metamorphic rocks and Upper Carboniferous siliciclastic rocks, and (ii) an active volcanic source, which supplied a large amount of rhyolitic rock-fragments to the coarse-grained sediments. The petrographic diversity of coarse-grained sediments implies that sedimentary sequences were accumulated simultaneously with the development of Sirinia basin.

Keywords: fluvial, meandering river, Sirinia Basin, South Carpathians

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