Sr isotope signatures in the Vendian Khorbusuonka group of the Olenek uplift (Northeastern Siberian Platform)

Calibrating the temporal and spatial dynamics of the Ediacaran - Cambrian radiation of animals

“…Screened 87 Sr/ 86 Sr data for the Khatyspyt Formation (boxed data in Fig. 4b-d) are notably depleted (mean = 0.708038, n = 19, Cui et al, 2016;Vishnevskaya et al, 2017Vishnevskaya et al, , 2013 relative to all screened data prior to the nadir in upper Cambrian Stage 2 (Table S2). Recent efforts to produce a global late Ediacaran 87 Sr/ 86 Sr compilation suggest that the low 87 Sr/ 86 Sr data recorded by the Khatyspyt Formation are supportive of a temporal placement approximately coincident with and postdating data from the Nama Group (Cui et al, 2020a).…”

Strontium isotopic ratio in brines from the north-east of the Angara-Lenskiy artesian basin

“…Their chemical composition is a result of geochemical metamorphisation of connate water in the salt basin at Vend/Cambrian boundary and further interaction with terrigenous rocks and carbonates. Initial isotopic strontium ratios in paleoocean water in the Vendian-Cambrian period (575-550 Ma) varied between 0.70802 and 0.70862 [3,4]. Almost all strontium ratio values measured in samples of highly concentrated brines from salt-bearing and subsalt-bearing hydrogeological formations fall within the range typical of modern seawater and paleoocean water (Fig.…”

“…Sr isotope ratio measured in brines from different geological environments: paleoocean water[3,4]; modern seawater[2]; brines in non-salt-bearing carbonate formation (Olenekskiy AB, depth of 115-1,650 m); brines in kimberlites (Olenekskiy AB, depth of 170-630 m); brines in salt-bearing and subsalt-bearing formation (Angara-Lenskiy AB, depth of 1,500-3,500 m; question markno data); in rocks: kimberlites ([5], depth of 50-800 m); carbonate formation (Olenekskiy AB, depth of 265-1,500 m).…”