Comparative evolution of the Iapetus and Rheic Oceans: A North America perspective

Murphy, J. Brendan; Keppie, J. Duncan; Nance, R. Damian; Dostál, J.

doi:10.1016/j.gr.2009.08.009

Cited by 83 publications

(17 citation statements)

References 193 publications

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“…In addition, it is important to consider that the contact between upper and lower metasedimentary sequences is a low-angle fault (ex tensional detachment), so these series could have been located at dif ferent positions along the margin. On the other hand, opening of the Rheic Ocean and transition of the Gondwana margin to a typical pas sive margin setting occurred between the Middle Cambrian and the Early Ordovician Murphy et al, 2010;. This agrees with the observed sedimentary evolution and explains the presence of N-MORB mafic rocks in the sedimentary se ries (Rodrtguez Aller, 2005), which are particularly more abundant in the upper sequence (Fig.…”

Section: Discussionsupporting

confidence: 76%

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Fuenlabrada

Arenas

Fernández

et al. 2012

Lithos

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Section: Discussionsupporting

confidence: 76%

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Fuenlabrada

Arenas

Fernández

et al. 2012

Lithos

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“…Early Ordovician separation of Avalonia is consistent with most paleogeographical reconstructions that place the Paleozoic Avalonian margin of Gondwana in the Iapetus Ocean (e.g., Cocks and Torsvik 2002;Stampfli and Borel 2002;Murphy et al 2010). The separation of Avalonia from Gondwana was contemporaneous with closure of the Taconic seaway and formation of the Notre Dame arc, collision of the Dashwoods microcontinent during the Taconic orogeny and thrusting of the Annieopsquotch ophiolite belt beneath the composite the Laurentian margin .…”

Section: Early Ordovician -Early Siluriansupporting

confidence: 79%

“…The increasing slab pull forces in Iapetus together with slab roll back beneath the arc in the Rheic Ocean were responsible for the transfer of Carolinia from Gondwana longitudinally into and across the contracting Iapetus Ocean. This model is analogous to the movement of the Cimmerian microcontinent across PaleoTethys and opening of Neo-Tethys in the Cenozoic (Stampfli and Borel 2002;Murphy et al 2010). Alternatively, Keppie et al (2003) proposed a scenario in which the transition from arc to rift geodynamic setting in Carolinia occurred as a result of ridge-trench collision in which the trench was replaced by a transform fault as the ridge was overridden, leading to a switch from arc-related to rift-related magmatism.…”

Section: Time Of Riftingmentioning

confidence: 99%

A paleogeographical review of the peri-Gondwanan realm of the Appalachian orogen¹This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.

2012

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The eastern edge of the Appalachian orogen is composed of a collection of Neoproterozoic -early Paleozoic domains, Avalonia, Carolinia, Ganderia, Meguma, and Suwannee, which are exotic to North America. Differences in the geological histories of these peri-Gondwanan domains indicate that each separated independently from Gondwana, opening the Rheic Ocean in their wake. Cambrian departure of Ganderia and Carolina was followed by the Ordovician separation of Avalonia and Silurian separation of Meguma. After separation in the early Paleozoic, these domains constituted the borderline between the expanding Rheic Ocean and contracting Iapetus Ocean. They were transferred to Laurentia by early Silurian closure of Iapetus and Devonian-Carboniferous closure of the Rheic Ocean during the assembly of Gondwana and Laurentia into Pangaea. The first domain to arrive at Laurentia was Carolinia, which accreted in the Middle Ordovician during the Cherokee orogeny. Salinic accretion of Ganderia occurred shortly thereafter and was followed by the Acadian accretion of Avalonia. The Acadian orogeny was immediately followed by Middle Devonian -Early Carboniferous accretion of Meguma and possibly Suwannee which led to the Fammenian orogeny. The episodicity of orogeny suggests that the present location of these domains parallels their order of accretion. However, each of these crustal blocks was translated along strike by large-scale Late Devonian -Carboniferous dextral strike-slip motion. The breakup of Pangaea occurred outboard of the Paleozoic collision zones that accreted

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“…But in North America, the role of the Rheic Ocean has been largely overlooked because its suture is not exposed, having been either buried beneath the sediments of the Coastal Plain or removed with the opening of the Atlantic Ocean and the Gulf of Mexico. As a result, the evolution of the Appalachian-Ouachita orogen is traditionally described in terms of Iapetus, despite the fact that the present structural architecture of this orogenic belt owes its origin to the Rheic Ocean (e.g., Murphy et al, 2009a).…”

Section: Introductionmentioning

confidence: 99%

A brief history of the Rheic Ocean

Nance

Gutiérrez-Alonso

Keppie

et al. 2012

Geoscience Frontiers

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248

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The Rheic Ocean was one of the most important oceans of the Paleozoic Era. It lay between Laurentia and Gondwana from the Early Ordovician and closed to produce the vast OuachitaAlleghanian-Variscan orogen during the assembly of Pangea. Rifting began in the Cambrian as a continuation of Neoproterozoic orogenic activity and the ocean opened in the Early Ordovician with the separation of several Neoproterozoic arc terranes from the continental margin of northern Gondwana along the line of a former suture. The rapid rate of ocean opening suggests it was driven by slab pull in the outboard Iapetus Ocean. The ocean reached its greatest width with the closure of Iapetus and the accretion of the periGondwanan arc terranes to Laurentia in the Silurian. Ocean closure began in the Devonian and continued through the Mississippian as Gondwana sutured to Laurussia to form Pangea. The ocean consequently plays a dominant role in the Appalachian-Ouachita orogeny of North America, in the basement geology of

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Comparative evolution of the Iapetus and Rheic Oceans: A North America perspective

Cited by 83 publications

References 193 publications

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

A paleogeographical review of the peri-Gondwanan realm of the Appalachian orogen¹This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.

A brief history of the Rheic Ocean

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Comparative evolution of the Iapetus and Rheic Oceans: A North America perspective

Cited by 83 publications

References 193 publications

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

Sm–Nd isotope geochemistry and tectonic setting of the metasedimentary rocks from the basal allochthonous units of NW Iberia (Variscan suture, Galicia)

A paleogeographical review of the peri-Gondwanan realm of the Appalachian orogen1This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.

A brief history of the Rheic Ocean

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Product

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A paleogeographical review of the peri-Gondwanan realm of the Appalachian orogen¹This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.