Geology and Age of the Late Archean Keivy Alkaline Province, Northeastern Baltic Shield

U-Pb ID-TIMS age of the Tiksheozero carbonatite: expression of 2.0 Ga alkaline magmatism in Karelia, Russia

“…The majority, including the economically most important ones, formed in the Paleozoic but there are also several older generations reaching into the Paleoproterozoic and the Neoarchean [1][2][3][4][5][6][7][8]. Al- * E-mail: fernando.corfu@geo.uio.no kalic complexes witness episodes of mantle activity, generally related to extensional tectonic processes in the crust [e.g.…”

Geochronology of the Arkansas Alkaline Province, Southeastern United States

“…Alkaline provinces are widely distributed in within-plate settings and occur throughout the last 2ϩ billion years of Earth's history (the current oldest known occurrence is the 2.68-Ga Sakharjok alkaline syenite complex, Kola Peninsula, Russia; Zozulya et al 2005). The tectonic setting for these provinces is still a matter of debate.…”

Layered Pge Paleoproterozoic (LIP) Intrusions in the N-E Part of the Fennoscandian Shield — Isotope Nd-Sr and 3He/4He Data, Summarizing U-Pb Ages (on Baddeleyite and Zircon), Sm-Nd Data (on Rock-Forming and Sulphide Minerals), Duration and Mineralization

“…In the north, the complex borders with the alkaline granites of the White Tundra intrusion. The alkaline granites were recently proved to be Archaean with a U-Pb zircon age of 2654±15 Ma (Bayanova 2004;Zozulya et al 2005). The contact of the Western Pansky Block with the Imandra-Varzuga volcanosedimentary sequence is mostly covered by Quaternary deposits.…”