Zircon provenance analysis of the local extensional basins of the Sudetian orogen in the East Ural zone

• DOI: 10.5194/egusphere-egu22-3990
• Publication Date: 2022-03-27T19:18:47Z
• Authors: Alexander Tevelev; Alexandra Borisenko; Ivan Sobolev; Alexey Kazansky; Natalia Pravikova; Egor Koptev; Jiri Žák; Vasiliy Chervyako...
• Keywords: Viséan; Basement; Protolith; Devonian

<p><strong>Introduction</strong>. Two structural zones are traditionally distinguished in the Eastern Urals. They Magnitogorsk zone and East Ural zone, which divided by a narrow suture. The Early Sudetian (Visean) orogenic phase is marked unconformity base of Upper Visean terrigenous-carbonate sequence both suture zone. According to drilling data granitic-pebble-bearing conglomerates present at this sequence. rearrangement implied end rifting initiation carbonate deposition.</p><p>The Pre-Sudetian basement comprised Lower Paleozoic deformed metamorphic rocks (gneisses, schists carbonaceous quartzites), clastic deposits Ordovician (wackes meta-arkoses) Carboniferous (greywackes), as well volcanic Tournasian-Early granitoids Neplyuevka complex, dated 355-340 Ma. represented igneous complexes Devonian – age.</p><p>This research aims determine source areas migration paths sediments for local basins associated with phase. conjunction two megazones could derive material from both.</p><p><strong>Materials methods</strong>. specimens were collected quarries near Novinka village where sandstones succession exposed. commonly cross-bedded, medium coarse-grained, have sub-arkose, arkose, greywacke or, sometimes, quartz-arenitic composition. 210 zircon grains extracted samples. 99 characterized discordancy no more than 5% been chosen evaluation age distribution parameters.</p><p><strong>Results discussion</strong>. dating results appeared be unexpected. Firstly, single analysis yielded isotope age, only grain Tournaisian age. Secondly, vast majority Cambrian ages, main peak corresponding beginning (480 Ma) secondary ones Late (450-460 Ma), Middle (510-520 (530-540 Ma).</p><p>So, not house zircone area basin derived However, study does contain any known suitable ages. detrital zircons are, fact, scarps host ages 478±5 Ma 529±6 Ma.</p><p><strong>Financial support</strong>. has funded RFBR CNF part project № 19-55-26009. U-Pb executed АААА-А18-118053090045-8 State task IGG UB RAS. Centre collective usage ‘Geoportal’,  Lomonosov Moscow University (MSU), provided access remote sensing data.</p>