The Laurentia – West Greenland connection at 1.9 Ga: New insights from the Rinkian fold belt

Nearly all of Greenland's bedrock geology is inaccessible because it is covered by the Greenland Ice Sheet. Therefore, geophysical investigations are especially important in furthering our understanding of Greenland's subglacial lithospheric structure. Greenland is a region of interest as its lithosphere contains cratonic material and records the history of Archean, Proterozoic, and Paleozoic orogenies and could provide insight into the history of the Iceland plume (e.g., Henriksen et al., 2009). The majority of Greenland is Precambrian and has been modified by multiple tectonic (orogenic and rifting) events (e.g., Henriksen et al., 2009). Of particular note is the Trans-Hudson Orogeny, which was a widespread set of plate collisions that helped to build Laurentia around 1.8 Ga (e.g., St-Onge et al., 2009). Orogenic belts from this event can be found across North America; in Greenland, this includes the Rinkian and Nagssugtoqidian belts that bound major crustal blocks (e.g.

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“…(2009), Dawes (2009), Higgins and Leslie (2000), Sanborn‐Barrie et al. (2017), van Gool et al. (2002), and Von Gosen and Piepjohn (1999).…”

Section: Discussionmentioning

confidence: 99%

Multi‐Layer Seismic Anisotropy Beneath Greenland

Nathan

Hariharan

Florez

et al. 2021

Geochem Geophys Geosyst

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“…8; Sanborn-Barrie et al, 2017), similar in age to underlying or nearby basement rocks (Rayner et al, 2012). Overlying upper Hoare Bay Group psammitic-semipelitic rocks were derived from both Archean (2.80-2.69 Ga) and Paleoproterozoic (1.99-1.97 Ga) sources (Sanborn- Barrie et al, 2017).…”

Section: Hoare Bay Group Age Constraintsmentioning

confidence: 94%

“…The absence of a 1.92 Ga detrital peak in the Hoare Bay succession, may reflect diachronous deposition, with sedimentation in eastern Baffin Island predating that to the northwest. The influx of Paleoproterozoic detritus into the Hoare Bay basin after 1.96 Ga points to uplift and exhumation of an extensive belt of 1.99 to 1.97 Ga plutonic rocks potentially corresponding to either the Taltson and Thelon magmatic zones (van Breemen et al, 1987(van Breemen et al, , 1992McDonough et al, 2000) to the west, 1.99 to 1.98 Ga orthogneiss of the Prudhoe Land complex in West Greenland (Nutman et al, 2008) to the north, or both (Sanborn-Barrie et al, 2017).…”

Section: Hoare Bay Group Age Constraintsmentioning

confidence: 99%

“…• Level 4 -The eastern Rae Craton (Bethune and Scammell, 2003a;Skipton et al, 2017;, consisting of Archean basement orthogneiss, felsic plutonic rocks and supracrustal packages, unconformably overlain along its southern margin by middle Paleoproterozoic supracrustal cover (Piling Group; Partin et al, 2014a;Wodicka et al, 2014) and stratigraphically similar units of the Hoare Bay Group on Cumberland Peninsula (Sanborn- Barrie et al, 2017). A middle Paleoproterozoic felsic plutonic suite (Qikiqtarjuaq plutonic suite; Rayner et al, 2012) intrudes both the cratonic basement and supracrustal cover strata.…”

Section: Tectonic Frameworkmentioning

confidence: 99%

“…Minimum age constraints are obtained from a 1897 +7/-4 Ma rapakivi-textured, K-feldspar megacrystic monzogranite intrusive into the southern turbiditic strata (Fig. 6; Wodicka et al, 2014), a unit possibly correlative (Sanborn- Barrie et al, 2017) with the Qikiqtarjuaq plutonic suite of Rayner et al (2012) and Sanborn- , and from in situ ages of 1878 ± 25 Ma and 1875 ± 31 Ma for metamorphic monazite growth in northern deposits of the Longstaff Bluff formation (Gagné et al, 2009).…”

Section: Piling Group Age Constraintsmentioning

confidence: 99%

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Archean and Paleoproterozoic cratonic rocks of Baffin Island

St-Onge

Scott

Rayner

et al. 2020

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Archean and Paleoproterozoic cratonic rocks of Baffin Island define four stacked structural levels that are juxtaposed within the middle Paleoproterozoic Trans-Hudson Orogen. From north to south, and highest to lowest structural level, these comprise:1) the Archean Rae Craton, unconformably overlain along its southern margin by middle Paleoproterozoic supracrustal cover (Piling Group) and stratigraphically similar units of the Hoare Bay Group on Cumberland Peninsula; 2) Archean to middle Paleoproterozoic metaplutonic units and middle Paleoproterozoic metasedimentary cover (Lake Harbour Group), collectively termed the 'Meta Incognita microcontinent'; 3) middle Paleoproterozoic orthogneiss, interpreted as a deformed arc-magmatic terrane (Narsajuaq terrane) or alternatively as Narsajuaq-age intrusions emplaced in the Meta Incognita microcontinent; and 4) Archean orthogneiss, interpreted as the northern continuation of the lower-plate Superior Craton, and associated middle Paleoproterozoic continental-margin supracrustal cover (Povungnituk Group).

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