Geological history of the Late Precambrian Patom Supergroup (Central Siberia)

Ediacaran Microfossils from the Ura Formation, Baikal-Patom Uplift, Siberia: Taxonomy and Biostratigraphic Significance

“…Moreover, coupled C and Sr isotopic data show a pattern of secular variation in the Dalnyaya Taiga and overlying successions that closely matches those of early to mid-Ediacaran rocks on other continents (Sovietov, 2002;Pokrovskii et al, 2006;Chumakov et al, 2007). This includes not only a negative C-isotopic anomaly in cap carbonates above the diamictite, but also a pronounced negative C-isotopic excursion in carbonates of the Zhuya Group that immediately overlie Dalnyaya Taiga strata, and a pattern of increasing 87 Sr/ 86 Taken at face value, then, C and Sr isotopes indicate that fossiliferous Ura shales were deposited in early but not earliest Ediacaran times, and predate most known Ediacaran macrofossil deposits.…”

Sources of clastic material of the Neoproterozoic metasedimentary rocks of the Baikal–Patom belt, Northern Transbaikalia: Evidence from Sm-Nd isotope data

“…Significant changes in ε Nd (T) at the contact between the Barakun and Khomolkha stratigraphic horizons indicate a change of the geochemical type of the source of terrigenous material supplying in the paleobasin at that time. Strongly negative ε Nd (T) for the metasediments from the lower and middle parts of the sequence, as well as their old ages within 3.1-2.3 Ga suggest that (2) ba-3 (3) ba-6 (4) bg-3 (5) bg-8 (6) 78-12 (7) 44-15 (8) м-2 (9) 49-15 (10) br-3 (11) nk-2 (12) b-13/10 (13) (Goldstein, Jacobsen, 1988 (Chumakov et al, 2007). Age boundaries of stratigraphic complexes are shown after (Melezhik et al, 2009;Chumakov et al, 2011;Powerman et al, 2015).…”

“…cycles, which correspond to the Ballaganach, Dal'nyaya Taiga, Zhuya, and Bodaibo groups. Three former groups are united into the Patom Complex, whereas the Bodaibo Group is ascribed to the Yudoma Complex (Chumakov et al, 2007;Nemerov et al, 2010;Chumakov et al, 2013 etc. …”

Lithogeochemistry of Vendian fine-grained clastic rocks in the Nepa-Zhuya region of the Siberian Platform

“…The formation and stratigraphic position of Neoproterozoic sedimentary and volcanosedimentary complexes, which are widespread along the southern periphery of the Siberian Platform, remain debatable for a long time (Semikhatov and Serebryakov, 1983;Ivanov et al, 1995;Chumakov et al, 2007;Stanevich et al, 2007). The Baikal-Patom region hosts the Baikal Complex, which is considered as a standard Siberian Upper Riphean (Baikalian) stratigraphic unit (Kho mentovskii et al, 1985;Khomentovskii, 2002).…”