BIOSTRATIGARPHY AND VOLCANISM IN ORDOVICIAN OF SALAIR
N.V. Sennikov1,2, O.T. Obut1,2, E.V. Lykova1, V.N. Tokarev3, A.V. Timokhin1, T.A. Shcherbanenko1, I.G. Zakiryanov1,2
a:2:{s:4:"TEXT";s:242:"1Trofimuk Institute of Petroleum Geology and Geophysics Siberian Branch of RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3«Zapsibgeols’emka», Novokuznetsk, Russia";s:4:"TYPE";s:4:"html";}
Keywords: Ordovician, Salair, biostratigraphy, terrigenous sedimentation, volcanic rocks
Abstract
Litho- and biostratigraphic analysis of number of reference Ordovician sections characterize five different blocks of Salair including West-Berd’ (Medvedkovo), East-Berd’, Krasnoe, Gurievsk and Eltsovka were done. Modern data on nine mainly terrigenous and rare carbonate-terrigenous sections yielded fossils and composed of carbonate units and volcanic rocks including tuff and tuff-sandstone, rarely lavas, were described. Ordovician terrigenous sedimentation in the region under investigation was complicated by stages of volcanic sedimentation. Volcanic-sedimentary sequences were found at four biostratigraphically dated levels in Salair region: 1) Tremadocian, 2) late Floian, 3) middle – late Darriwilian, 4) late Katian – Hirnantian.
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