Two detrital zircon signatures for the Cambrian passive margin of northern Laurentia highlighted by new U-Pb results from northern Canada

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

“…Data are from this study and Lorenz et al (2012), Watt et al (2000), Leslie and Nutman (2003), Dhuime et al (2007), and Sláma et al (2011). 2600-2700 Ma ages ( fig. 12; Hadlari et al 2012). Succession II strata of the Pearya Terrane share the peaks characteristic of autochthonous Laurentian strata but differ in having a major 900-990 Ma component, a minor but well-defined 635-710 Ma signature, and greatly suppressed 1800-2000 Ma peaks ( fig.…”

“…Normalized probability density plots comparing the Pearya Terrane sample groups with detrital zircon data sets from autochthonous Laurentian strata and the Arctic Alaska-Chukotka Terrane. Age spectra are from Peary Land (Kirkland et al 2009); the Archer Fiord, Rawlings Bay, and Kennedy Channel Formations in the Franklinian Basin shelf environment (Anfinson et al 2011;Hadlari et al 2014); the Grant Land Formation and Nesmith Beds in the Franklinian Basin deep-water environment (Beranek et al 2013;Hadlari et al 2014); Proterozoic to Cambrian sediments of northwest Laurentia (Hadlari et al 2012); Neoproterozoic to Cambrian strata of the North Slope Subterrane (Macdonald et al 2009;Strauss et al 2013); and Cambrian or younger Group 1 metasediments on the Seward Peninsula (Amato et al 2009) in the Arctic Alaska-Chukotka Terrane. All plots used the same criteria employed for the Pearya Terrane data of this study (see text for discussion).…”

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“…Lane, 2013, personal commun. ), some Cambrian strata that accumulated along the northern Canadian passive margin (Hadlari et al, 2012), a broad range of circum-Arctic strata (Amato et al, 2009;Miller et al, 2006Miller et al, , 2010, and the Franklinian clastic wedge (Beranek et al, 2010;Anfi nson et al, 2011) (Fig. 11).…”

Detrital zircon geochronology of the Grenville/Llano foreland and basal Sauk Sequence in west Texas, USA

“…In Laurentia, syn-collisional detritus shed off the evolving Grenville deformation front is preserved in a variety of settings, ranging from widely dispersed extensional basins (e.g., Midcontinent Rift, Fort Wayne Rift) to broad, fl uvial aprons hundreds to even thousands of kilometers in width (Cawood et al, 2007;Hadlari et al, 2012;Rainbird et al, 2012, and references therein). In contrast, the preserved lateral extent of foreland basin deposition (as defi ned by Allen and Allen, 2005) is thought to be limited to a small number of localities proximal to the Grenville thrust front (Santos et al, 2002;Cawood et al, 2007;Baranoski et al, 2009;Rainbird et al, 2012).…”