TY - JOUR

T1 - Sr-Isotopic Composition of Paleoocean Water 960 Ma Ago (according to the Data for the Nizhny Tunguska Formation of the Turukhansk Uplift, Siberian Platform)

AU - Letnikova, E. F.

AU - Zhdanov, A. A.

AU - Ivanov, A. V.

AU - Maslov, A. V.

AU - Izokh, A. E.

AU - Letnikova, A. F.

AU - Soloshenko, N. G.

N1 - This work was supported by the Russian Science Foundation (project no. 19-17-00099 for field, petrographic, mineralogical research, geochronology of volcanic rocks, and Sr- chemostratigraphy; grant no. 21-17-00052 is for petrographic and mineralogical studies of terrigenous rocks and U–Pb dating of zircons from the Derevninskaya and Nizhny Tunguska formations). Публикация для корректировки.

PY - 2023/11

Y1 - 2023/11

N2 - The Sr-isotopic composition in carbonate rocks aged 980–920 Ma has been defined in only one place in the world, the Huainan Formation of the North China Platform, with the accumulation time limited by U–Pb data of detrital zircon grains. The upper part of the Nizhny Tunguska Formation in the Turukhansk uplift is found to contain altered volcanic rocks, as well as weathering crust products along them, such as poor bauxite and chamosite ores, among carbonate deposits. Based on U–Pb zircon isotope dating, the age of the volcanic rocks is 963 Ma. For the least altered limestones in the upper part of the Nizhny Tunguska Formation, the 87Sr/86Sr values were obtained equal to 0.70532–0.70578, which are close to those found in the rocks of the Huainan Formation. These data about the geochronological age of the studied limestones make it possible to obtain more accurate data, which allows refining the previously proposed configuration of the Sr-isotopic composition variation curve in the Early Neoproterozoic. The Nizhny Tunguska Formation compares favorably with the Huainan Formation in being the world’s only Early Neoproterozoic carbonate sequence that is correctly geochronologically substantiated (based on zircon from subsynchronous volcanic rocks).

AB - The Sr-isotopic composition in carbonate rocks aged 980–920 Ma has been defined in only one place in the world, the Huainan Formation of the North China Platform, with the accumulation time limited by U–Pb data of detrital zircon grains. The upper part of the Nizhny Tunguska Formation in the Turukhansk uplift is found to contain altered volcanic rocks, as well as weathering crust products along them, such as poor bauxite and chamosite ores, among carbonate deposits. Based on U–Pb zircon isotope dating, the age of the volcanic rocks is 963 Ma. For the least altered limestones in the upper part of the Nizhny Tunguska Formation, the 87Sr/86Sr values were obtained equal to 0.70532–0.70578, which are close to those found in the rocks of the Huainan Formation. These data about the geochronological age of the studied limestones make it possible to obtain more accurate data, which allows refining the previously proposed configuration of the Sr-isotopic composition variation curve in the Early Neoproterozoic. The Nizhny Tunguska Formation compares favorably with the Huainan Formation in being the world’s only Early Neoproterozoic carbonate sequence that is correctly geochronologically substantiated (based on zircon from subsynchronous volcanic rocks).

KW - Early Neoproterozoic

KW - Siberian Platform

KW - chemostratigraphy

KW - detrital zircons

KW - volcanic rocks

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85170565668&origin=inward&txGid=df747fb5dc08f072ba429d94ec3c7530

UR - https://www.mendeley.com/catalogue/1ac0f3d2-1b78-3aaa-8e5f-ba89bbdcb898/

U2 - 10.1134/S1028334X23601694

DO - 10.1134/S1028334X23601694

M3 - Article

VL - 513

SP - 1147

EP - 1155

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

IS - 1

ER -