Document of bibliographic reference 354620

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Evidence for the intrusion of marine Atlantic waters into the West Siberian Arctic during the Middle Pleistocene

Abstract

Marine sediments occupy a significant portion of the Quaternary succession in the West Siberian Arctic but, until recently, their ages and distributions have been strongly debated. Based on new geological, palaeontological and geochronological data obtained within the last decade, we hereby postulate the following: (i) Two different Pleistocene interglacial marine formations are exposed across the West Siberian Arctic. The older Kheta marine formation, sandwiched between two Middle Pleistocene till beds, yields optically stimulated luminescence (OSL) ages of c. 200 ka (MIS 7). The younger Karginsky/Payuta marine formation, overlying the Middle Pleistocene Taz till, contains a boreal mollusc fauna and has an OSL age of c. 115 ka (MIS 5e). These Middle and Upper Pleistocene marine beds have been correlated across a vast region between the Ob’ and Yenisey estuaries. (ii) The marine transgression during MIS 7 spread as far south into West Siberia as 65°N, almost 1000 km southwards from the present-day Kara Sea shoreline. Meanwhile, the smaller marine transgression during MIS 5e reached as far south as 68°N. (iii) Both marine formations contain a boreal molluscan fauna, which is not found in the modern Kara Sea but is characteristic of the North Atlantic. We propose that warmer Atlantic waters penetrated much further eastwards during both MIS 7 and MIS 5e than at present. The diagnostic extinct mollusc species Cyrtodaria jenisseae has only been found in the older Kheta marine formation (MIS 7).

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000698907800001

Bibliographic citation

Nazarov, D.V.; Nikolskaia, O.A.; Gladysheva, A.S.; Zhigmanovskiy, I.V.; Ruchkin, M.V.; Merkuljev, A.V.; Thomsen, K.J. (2022). Evidence for the intrusion of marine Atlantic waters into the West Siberian Arctic during the Middle Pleistocene. Boreas 51(2): 402-425. https://dx.doi.org/10.1111/bor.12558

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true