Middle Cambrian to Ordovician arc-backarc development on the leading edge of Ganderia, Newfoundland Appalachians

Zagorevski, A; Staal, Cees R. van; Rogers, N; McNicoll, Vicki J.; Pollock, Jeffrey C.

doi:10.1130/2010.1206(16)

Cited by 57 publications

(76 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of basalts and basaltic andesites in the Annidale Group with both depleted and non-depleted Nb signatures is characteristic of mafic volcanic rocks erupted in an arc-backarc setting Johnson et al 2009). The age range of volcanic rocks in the Annidale Group (493 ± 2 Ma to 481 ± 2 Ma) is comparable to that of the younger Penobscot volcanic arc sequences (497 ± 2 Ma to 487 ± 3 Ma) in the Victoria Lake Supergroup of central Newfoundland (Dunning et al 1991;Rogers et al 2006;Zagorevski et al 2007Zagorevski et al , 2010.…”

Section: Annidale Terranementioning

confidence: 63%

“…The total age range of the Ellsworth volcanic rocks in New Brunswick and Maine (514 ± 2 Ma to 504 ± 3 Ma) is comparable with that of the older Penobscot volcanic arc sequences (513 ± 2 Ma to 506 ± 3 Ma) in the Victoria Lake Supergroup of central Newfoundland (Dunning et al 1991;Rogers et al 2006;Zagorevski et al 2007Zagorevski et al , 2010. The rocks of both the Ellsworth and Castine volcanic sequences in Maine are composed of bimodal basalt-rhyolite assemblages that formed in an extensional marine tectonic setting (Schultz et al 2008).…”

Section: Panel Cmentioning

confidence: 67%

“…Despite their complex deformational history, the Penobscot volcanic sequences in the Victoria Lake Supergroup become consistently younger to the northwest, suggesting subduction was to the southeast beneath the leading edge of Ganderia (Dunning et al 1991;Rogers et al 2006;Valverde-Vaquero et al 2006a;Zagorevski et al 2007Zagorevski et al , 2010. Similarly, the Penobscot volcanic sequences in the New River and Annidale terranes become younger to the northwest, supporting southeasterly directed subduction in New Brunswick as well (Fig.…”

Section: Penobscot Orogenic Cyclementioning

confidence: 95%

“…The rocks of both the Ellsworth and Castine volcanic sequences in Maine are composed of bimodal basalt-rhyolite assemblages that formed in an extensional marine tectonic setting (Schultz et al 2008). As in Newfoundland, this change from an arc setting for the upper Lower Cambrian volcanic rocks (Mosquito Lake Road Formation) to an extensional setting for those of the Middle Cambrian (Ellsworth Schist and Castine Volcanics) may be related to northwestward retreat of a subduction zone dipping beneath the leading edge of Ganderia (Rogers et al 2006;Zagorevski et al 2007Zagorevski et al , 2010.…”

Section: Panel Cmentioning

confidence: 99%

“…As well, no post-Penobscot calcareous sedimentary rocks, containing characteristic Early Ordovician Celtic fauna like those of northern New Brunswick and central Newfoundland, are known in southern New Brunswick. The paleogeographic setting of the New River and Annidale terranes therefore may compare more closely to the volcanic succession of the probable Upper Cambrian to Lower Ordovician Bay du Nord Group in the Hermitage Flexure along the south coast of Newfoundland (Dunning and O'Brien 1989;Tucker et al 1994;Valverde-Vaquero et al 2006b;Zagorevski et al 2010) No volcanic rocks are preserved beneath the Penobscot unconformity in the type area in Maine. However, wacke beds near the top of the Patrick Brook Formation (Miramichi Group), which lie directly below the unconformity exposed on the Tetagouche River in northeastern New Brunswick, contain abundant volcanic detritus Fyffe 1991, 1995;Fyffe et al 1997;Rogers et al 2003).…”

Section: Penobscot Orogenic Cyclementioning

confidence: 99%

See 4 more Smart Citations

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Fyffe

Johnson²,

Staal

2012

atgeol

View full text Add to dashboard Cite

Geological relationships preserved in the New Brunswick segment of the Appalachian orogen are key to deciphering the complex tectonic events that occurred during the closing of the Paleozoic Iapetus Ocean. These events can be explained in terms of geodynamic interactions between eight lithotectonic terranes. The first, the Caledonia terrane, comprises Neoproterozoic volcanic arc sequences and comagmatic plutons considered to form part of the microcontinent of Avalonia. The seven other terranes are associated with the microcontinent of Ganderia and consist of (1) Brookville terrane-Mesoproterozoic to Neoproterozoic platformal carbonates and Neoproterozoic to Early Cambrian plutonic rocks, (2) New River terrane-Neoproterozoic volcanic arc sequences and comagmatic plutons overlain by a Cambrian Penobscot volcanic arc sequence, In New Brunswick, closure of the Iapetus Ocean is attributed to four major tectonic episodes: (1) the Penobscot orogeny, which accreted the Miramichi, Annidale, and St. Croix terranes to the New River terrane on the trailing edge of Ganderia by closing a Penobscot backarc basin in the Early Ordovician, (2) the Taconic orogeny, which accreted the Popelogan terrane on the leading edge of Ganderia to the Laurentian margin in the Late Ordovician and effectively closed the main tract of the Iapetus Ocean, (3) the Salinic orogeny, which accreted the Elmtree and Miramichi terranes to the Laurentian margin by closing the Tetagouche backarc basin in the Silurian, and (4) the Acadian orogeny, which accreted the Caledonia terrane (Avalonia) to the Brookville and New River terranes on the trailing edge of Ganderia in the latest Silurian to earliest Devonian and in the process closed the last remaining oceanic tract in the northeastern Appalachians. RÉSUMÉLes corrélations géologiques préservées dans la partie du Nouveau-Brunswick de l'orogène des Appalaches sont essentielles pour bien comprendre le déroulement des événements tectoniques complexes survenus au moment de la fermeture de l'océan Iapetus, pendant le Paléozoïque. Il est possible d'expliquer ces événements par des interactions géodynamiques entre huit terranes lithotectoniques. Le premier, soit le terrane calédonien, comprend des séquences d'arc volcanique et des plutons comagmatiques du Néoprotérozoïque dont on estime qu'ils faisaient partie du microcontinent Avalonia. Les sept autres terranes sont associés au microcontinent Ganderia et comprenaient les terranes que voici : (1)

show abstract

Section: Annidale Terranementioning

confidence: 63%

Section: Panel Cmentioning

confidence: 67%

Section: Penobscot Orogenic Cyclementioning

confidence: 95%

Section: Panel Cmentioning

confidence: 99%

Section: Penobscot Orogenic Cyclementioning

confidence: 99%

See 3 more Smart Citations

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Fyffe

Johnson²,

Staal

2012

atgeol

View full text Add to dashboard Cite

show abstract

Late Paleozoic strike-slip faults in Maritime Canada and their role in the reconfiguration of the northern Appalachian orogen

et al. 2015

View full text Add to dashboard Cite

Major late Paleozoic faults, many with documented strike-slip motion, have dissected the Ordovician-Devonian Appalachian orogen in the Maritime Provinces of Atlantic Canada. Activity alternated between east-west faults (Minas trend) and NE-SW faults (Appalachian trend). NW-SE faults (Canso trend) were probably conjugate to Minas-trend faults. Major dextral movement, on faults with Appalachian trend, in total between 200 and 300 km, began in the Late Devonian. This movement initiated the Maritimes Basin in a transtensional environment at a releasing bend formed around a promontory in the Laurentian margin and thinned the crust, accounting for the major subsidence of the basin. Appalachian-trend strike slip continued in the Mississippian but was accompanied by major movement on E-W Minas-trend faults culminating around the Mississippian-Pennsylvanian boundary, juxtaposing the Meguma and Avalon terranes of the Appalachians close to their present-day configuration. However, strike slip continued during the Pennsylvanian-Permian interval resulting in transpressional deformation that reactivated and inverted earlier extensional faults. A final major episode of transtension, mainly sinistral, occurred during the Mesozoic opening of the Atlantic Ocean. Restoration of movements on these faults, amounting to several hundred kilometers of slip, explains anomalies in the present-day distribution of terranes amalgamated during early Paleozoic Appalachian tectonism. In the restored geometry, the Nashoba and Ellsworth terranes of Ganderia are adjacent to one another, and the Meguma terrane lies clearly outboard of Avalonia. A restored post-Acadian paleogeography, not the present-day geometry of the orogen, should be used as a basis for reconstructions of its earlier Paleozoic history.

show abstract

The Record of Ordovician Arc–Arc and Arc–Continent Collisions in the Canadian Appalachians During the Closure of Iapetus

Zagorevski

Staal

2011

Frontiers in Earth Sciences

View full text Add to dashboard Cite

Middle Cambrian to Ordovician arc-backarc development on the leading edge of Ganderia, Newfoundland Appalachians

Cited by 57 publications

References 0 publications

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Late Paleozoic strike-slip faults in Maritime Canada and their role in the reconfiguration of the northern Appalachian orogen

The Record of Ordovician Arc–Arc and Arc–Continent Collisions in the Canadian Appalachians During the Closure of Iapetus

Contact Info

Product

Resources

About