Baltica in the Cordillera?

Proterozoic Evolution of the North Atlantic–Arctic Caledonides: Insights from Detrital Zircon Analysis of Metasedimentary Rocks from the Pearya Terrane, Canadian High Arctic

“…Placing other elements of the AAC in a similar but more distal position northeast of Greenland provides a potential pathway for Cryogenian grains from the Arctic Alaska igneous units of this age to reach the Pearya Terrane ( fig. 12) and supports the ties between the Arctic Alaska and Pearya Terranes and the Caledonides invoked for various Neoproterozoic to Mesozoic reconstructions of the Arctic (e.g., Miller et al 2006Miller et al , 2010Miller et al , 2011Amato et al 2009;Colpron and Nelson 2009;Beranek et al 2010). Figure 13 depicts a series of latest Mesoproterozoic to Neoproterozoic paleogeographic reconstructions for basin development along the North Atlantic Caledonian margin that attempt to explain the regional variation of detrital zircon signatures observed.…”

Detrital zircon ages of Cambrian and Devonian sandstones from Estonia, central Baltica: a possible link to Avalonia during the Late Neoproterozoic

“…1a). Noteworthy, lately reported was a similar age cluster of zircon grains separated from Cambrian sandstones from the neighboring St Petersburg area in western Russia (Miller et al 2011). These relatively younger zircon grains were delivered obviously not from the core of Baltica but rather more likely from the peripheral orogenic belts around Baltica.…”

“…Concerning Baltica, detrital zircon analysis has been conducted mostly along its outer margins, but not much in the center, for identifying relevant tectonic links to surrounding continental blocks (e.g. Valverde-Vaquero et al 2000;Bingen et al 2005;Nawrocki & Poprawa 2006;Cawood et al 2007;Kuznetsov et al 2010;Miller et al 2011).…”

U-Pb and Hf isotope analysis of detrital zircons from the Banks Island assemblage (coastal British Columbia) and southern Alexander terrane (southeast Alaska)

“…Suggested origins include the Klamath region of northern California (Jones et al, 1972), a location similar to its current position followed by accordion-style rifting and re-accretion (Churkin and Eberlein, 1977), the Austral-Asia region (Gehrels and Saleeby, 1987), and the peri-Gondwana/Appalachian region (Wright and Wyld, 2006). Many workers now favor an origin for the terrane in the Arctic realm on the basis of geologic, geochronologic, paleomagnetic, and paleontologic data (Soja, 1994;Bazard et al, 1995;Gehrels et al, 1996;Blodgett et al, 2002;Soja and Krutikov, 2008;Grove et al, 2008;Blodgett, 2010;Miller et al, 2010Miller et al, , 2011Nelson, 2009, 2011;Beranek et al, 2013aBeranek et al, , 2013b.…”