Neoproterozoic orogeny along the margin of Rodinia: Valhalla orogen, North Atlantic

Cawood, Peter A.; Strachan, Rob; Cutts, Kathryn; Kinny, Peter D.; Hand, Martin; Pisarevsky, Sergei

doi:10.1130/g30450.1

Cited by 221 publications

(148 citation statements)

References 20 publications

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“…It probably relates in a general way to slightly older Knoydartian orogenic events dated between 820 and 735 Ma in the Moine Supergroup of mainland Scotland (Rogers et al 1998;Vance et al 1998;Cutts et al 2010;Cawood et al 2015) and the Laurentian-derived Sørøy Succession of northern Norway (Kirkland et al 2006(Kirkland et al , 2008. The overall tectonic significance of these orogenic events has been much debated, the most recent syntheses suggesting that they correspond to accretionary events along a proximal active margin of the Rodinia supercontinent (Cawood et al 2010(Cawood et al , 2015Kirkland et al 2011). Although there is evidence of Neoproterozoic metamorphism within the Westing Group in western Unst at c. 930 Ma (Cutts et al 2009), younger Cryogenian Knoydartian orogenesis has hitherto been unreported in Shetland.…”

Section: Evidence For Knoydartian Deformation and Metamorphism In Normentioning

confidence: 94%

Evidence from Rb–Sr mineral ages for multiple orogenic events in the Caledonides of Shetland, Scotland

Walker

Thirlwall

Strachan

et al. 2016

JGS

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Section: Evidence For Knoydartian Deformation and Metamorphism In Normentioning

confidence: 94%

Evidence from Rb–Sr mineral ages for multiple orogenic events in the Caledonides of Shetland, Scotland

Walker

Thirlwall

Strachan

et al. 2016

JGS

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“…The Valhalla Orogen (Cawood et al, 2010;Cawood et al, 2015) is preserved in northeast Laurentia (Fig. 2) and in correlative successions along northern Laurentia and possibly extending as far as Siberia (Cawood et al, 2016;Likhanov et al, 2015;Malone et al, 2014 (Cutts et al, 2009;Friend et al, 2003;Kirkland et al, 2006;Kirkland et al, 2007;Kirkland et al, 2008;Watt et al, 2000).…”

Section: Northeast Laurentia -Valhalla Orogenmentioning

confidence: 99%

“…4;Pisarevsky, 2016). In view of the issues with the Baltican poles we have not used them in our reconstructions, which are based on the relatively simple model for the Asgard Ocean opening (Cawood et al, 2010).…”

Section: Northeast Laurentia -Valhalla Orogenmentioning

confidence: 99%

Laurentia-Baltica-Amazonia relations during Rodinia assembly

Cawood

Pisarevsky

2017

Precambrian Research

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146

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“…18c), the amalgamation of the already assembled Cathaysia took place with the Yangtze along the Jiangnan domain and resulted into the closure of the Jiangnan arc-back-arc basin, which finally created the united SCB along the Jinningian orogen. The process of northwesterly episodic amalgamation for the eastern SCB constitute part of an exterior accretionary orogen situating between Western Australia and East Antarctica around the periphery of Rodinia (e.g., Cawood et al, 2007Cawood et al, , 2010Cawood et al, , 2013.…”

Section: An Exterior Accretionary Orogen For the Scb Along The Marginmentioning

confidence: 99%

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

Wang

Zhang

Cawood

et al. 2013

Precambrian Research

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231

121

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Keywords:Metabasic rocks MORB-and/or arc-like geochemical signatures Earliest Neoproterozoic Arc and back-arc system Eastern South China Block Periphery of Rodinia a b s t r a c t U-Pb geochronology along with elemental and Nd-Hf-Os isotopic data from the earliest Neoproterozoic metabasic rocks within the Cathaysia Block of the South China Block (SCB) constrain the tectonic setting and paleogeography of the block within the Rodinia supercontinent. The metabasic rocks give zircon U-Pb ages of 969-984 Ma, ε Hf (t) values of +1.8 to +15.3 and Hf model ages of 0.92-1.44 Ga. They are subalkaline basalts that can be geochemically classified into four groups. Group 1 has low Nb contents (1.24-4.33 ppm), highly positive ε Nd (t) values (+4.3 to +5.2), and REE and multi-elemental patterns similar to fore-arc MORB-type basalt. Group 2 has Nb contents ranging from 3.13 ppm to 6.48 ppm, ε Nd (t) of +3.1 to +6.2, low Re and Os contents and high initial Os isotopic ratios, and displays an E-MORB geochemical signature. Group 3 has Nb = 7.18-29.87 ppm, Nb/La = 0.60-1.40, Nb/U = 5.0-37, Ce/Pb = 1.1-6.6, ε Nd (t) = +2.9 to +7.0, 187 Re/ 188 Os = 5.87-8.87 and ␥Os (t) = 178-772, geochemically resembling to the Pickle Nb-enriched basalt. Group 4 has strong LREE/HREE and HREE fractionation and high ε Nd (t) values (+2.3 to +5.6), and is characterized by similar element patterns to arc volcanic rocks. Serpentinites coeval to Group 4 show 187 Os/ 188 Os of 0.1143-0.1442 and ␥Os (t) of −7.8 to +0.1. Groups 1 and 2 are interpreted to originate from the N-MORB and E-MORB-like sources with the addition of an arc-like component, genetically linked to fore-and back-arc settings, respectively. Groups 3 and 4 show inputs of newly subduction-derived melt and fluid in the wedge source. These geochronological and geochemical signatures fingerprint the development of an earliest Neoproterozoic (∼970 Ma) arc-back-arc system along the Wuyi-Yunkai domain of the Cathaysia Block. Regional relationships indicate that the Wuyi-Yunkai arc-back-arc system was one of a series of separate convergent margin settings, which included the Shuangxiwu (∼970-880 Ma) and Jiangnan (∼870-820 Ma) systems that developed in the SCB. The formation and closure of these arc-back-arc systems resulted in the northwestwardly episodic amalgamation of various pieces of the Yangtze and Cathaysia to finally form the SCB. These signatures require the SCB to occupy an exterior accretionary orogen along the periphery of Rodinia during 990-820 Ma, rather than to have formed through Mesoproterozoic Sibao orogenesis within the interior of Rodinia.

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Neoproterozoic orogeny along the margin of Rodinia: Valhalla orogen, North Atlantic

Cited by 221 publications

References 20 publications

Evidence from Rb–Sr mineral ages for multiple orogenic events in the Caledonides of Shetland, Scotland

Evidence from Rb–Sr mineral ages for multiple orogenic events in the Caledonides of Shetland, Scotland

Laurentia-Baltica-Amazonia relations during Rodinia assembly

Geochronological, geochemical and Nd–Hf–Os isotopic fingerprinting of an early Neoproterozoic arc–back-arc system in South China and its accretionary assembly along the margin of Rodinia

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