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Late Neoproterozoic Baltic paleosol: Intense weathering at high latitude?

2014; Geological Society of America; Volume: 42; Issue: 4 Linguagem: Inglês

10.1130/g35209.1

1943-2682

Sirle Liivamägi, Peeter Somelar, William C. Mahaney, Juho Kirs, Ilze Vircava, Kalle Kirsimäe,

Geochemistry and Elemental Analysis

Research Article| April 01, 2014 Late Neoproterozoic Baltic paleosol: Intense weathering at high latitude? Sirle Liivamägi; Sirle Liivamägi * 1Department of Geology, Tartu University, 50411 Tartu, Estonia *E-mail: sirle.liivamagi@ut.ee. Search for other works by this author on: GSW Google Scholar Peeter Somelar; Peeter Somelar 1Department of Geology, Tartu University, 50411 Tartu, Estonia Search for other works by this author on: GSW Google Scholar William C. Mahaney; William C. Mahaney 2Quaternary Surveys, 26 Thornhill Avenue, Thornhill, Ontario L4J 1J4, Canada Search for other works by this author on: GSW Google Scholar Juho Kirs; Juho Kirs 1Department of Geology, Tartu University, 50411 Tartu, Estonia Search for other works by this author on: GSW Google Scholar Ilze Vircava; Ilze Vircava 1Department of Geology, Tartu University, 50411 Tartu, Estonia Search for other works by this author on: GSW Google Scholar Kalle Kirsimäe Kalle Kirsimäe 1Department of Geology, Tartu University, 50411 Tartu, Estonia Search for other works by this author on: GSW Google Scholar Author and Article Information Sirle Liivamägi * 1Department of Geology, Tartu University, 50411 Tartu, Estonia Peeter Somelar 1Department of Geology, Tartu University, 50411 Tartu, Estonia William C. Mahaney 2Quaternary Surveys, 26 Thornhill Avenue, Thornhill, Ontario L4J 1J4, Canada Juho Kirs 1Department of Geology, Tartu University, 50411 Tartu, Estonia Ilze Vircava 1Department of Geology, Tartu University, 50411 Tartu, Estonia Kalle Kirsimäe 1Department of Geology, Tartu University, 50411 Tartu, Estonia *E-mail: sirle.liivamagi@ut.ee. Publisher: Geological Society of America Received: 17 Oct 2013 Revision Received: 14 Jan 2014 Accepted: 19 Jan 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (4): 323–326. https://doi.org/10.1130/G35209.1 Article history Received: 17 Oct 2013 Revision Received: 14 Jan 2014 Accepted: 19 Jan 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Sirle Liivamägi, Peeter Somelar, William C. Mahaney, Juho Kirs, Ilze Vircava, Kalle Kirsimäe; Late Neoproterozoic Baltic paleosol: Intense weathering at high latitude?. Geology 2014;; 42 (4): 323–326. doi: https://doi.org/10.1130/G35209.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The Neoproterozoic was a time when repeated global cooling events, interrupted by supergreenhouse phases, preceded environmental change toward a modern oxygen-rich atmosphere and the eventual emergence of animal life. Cyclically increased atmospheric CO2 levels intensified weathering of continental silicates, but little is known about the influence of Neoproterozoic climates on soil morphogenesis, which acts as a direct proxy of conditions at the time of formation. However, being typically fragmented in time and space, these mineralic soils (paleosols) had a low preservation potential. An exceptionally well preserved Neoproterozoic deeply weathered paleosol on the Baltica paleocontinent provides new information on weathering during the Precambrian. The kaolinite–Fe-oxyhydroxide composition of this paleosol is indicative of intense weathering in a stable landscape at a time when Baltica was positioned between intermediate to high southern latitudes. It is plausible that this paleosol developed over long steady-state weathering under temperate climatic conditions, or alternatively during an intensified weathering event triggered by elevated CO2 levels and transient greenhouse climatic conditions at the termination of Ediacaran glaciations, or possibly the Ediacaran Shuram-Wonoka isotope event. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.