Late Silurian volcanism in coastal Maine: The Cranberry Island series

Seaman, S. J.; Scherer, Erik E.; Wobus, R.A.; Zimmer, Jonathan H.; Sales, J. Gregory

doi:10.1130/0016-7606(1999)111<0686:lsvicm>2.3.co;2

Cited by 27 publications

(12 citation statements)

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“…This change is refl ected in the transitional chemistry of the volcanic rocks of the Eastport Formation, which replace the Hersey Formation laterally and overlie it. The tholeiitic and bimodal character of the vol canic rocks of the Eastport Formation is consistent with continental extension during the Late Silurian to Early Devonian in potential correlatives of the Eastport Formation in Maine (Seaman et al, 1999) andNew Brunswick (Van Wagoner et al, 2002;Barr et al, 2002). Thus, the geochemical signature of the Eastport Formation refl ects the shift in geodynamic regime away from a continental arc environment in the Early to Late Silurian to an extensional regime (i.e., continental rift) in the Late Silurian.…”

Section: Implications For Tectonic Settingsupporting

confidence: 64%

“…Evidence that the Early to Late Silurian volcanic rocks in the Machias-Eastport area formed in an arc environment contrasts with some previous interpretations that portray Silurian rocks of the Coastal Volcanic belt and the coastal Maine magmatic province as a bimodal magmatic suite formed in an extensional environment (Gates and Moench, 1981;Pinette and Osberg, 1989;Doig et al, 1990;Hogan and Sinha, 1989;Mitchell and Rhodes, 1989;Van Wagoner et al, 1989, 2002Seaman et al, 1999). The coastal Maine magmatic province (Hogan and Sinha, 1989) includes over 100 Late Silurian to Carboniferous felsic and mafi c plutons.…”

Section: Regional Correlationsmentioning

confidence: 71%

“…This sequence is at least 8 km thick in the Eastport area. Based on stratigraphic and fossil correlations, and on a limited number of radiometric ages, the Machias-Eastport rocks have been related to the Vinalhaven Rhyolite, the Cranberry Island series, the Isle au Haut volcanic series, and the Castine volcanic series of coastal Maine (Brookins et al, 1973;Pinette and Osberg, 1989;Seaman et al, 1995Seaman et al, , 1999Fig. 1A).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Coastal Volcanic belt has been variously interpreted as a continental arc emplaced through Avalonian basement as a result of subduction and subsequent closing of the Iapetus Ocean (Bradley, 1983;Ludman et al, 1993;Rankin, 1994;Bradley et al, 1998Bradley et al, , 2000, a volcanic arc emplaced on the trailing edge of Ganderia (Van Staal et al, 2009;Zagorevski et al, 2010), or as volcanism related to an extensional environment (e.g., Gates and Moench, 1981;Seaman et al, 1999;Van Wagoner et al, 1989, 2002. Extensional models have interpreted the magmatic rocks of the Coastal Volcanic belt to have formed in a continental rift (Dostal et al, 1989), in a backarc basin (Fyffe et al, 1999), or in transpressional basins related to transcurrent faulting (Murphy et al, 1995) that involved oblique strike-slip movement of Avalonia against Laurentia (Williams and Hatcher, 1983;Ferril and Thomas, 1988;Hogan and Sinha, 1989;Osberg et al, 1989;Dostal et al, 1993;Doig et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of Silurian-Devonian volcanic rocks in the Coastal Volcanic belt, Machias-Eastport area, Maine: Evidence for a pre-Acadian arc

Llamas¹,

Hepburn²

2013

Geological Society of America Bulletin

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The Coastal Volcanic belt in easternmost Maine consists of Silurian-Devonian volcanic rocks related to the convergence of Avalonia with the leading edge of composite Laurentia just before and during early stages of the Acadian orogeny. New major-and traceelement analyses from the Machias-Eastport area indicate that the Early to Late Silurian volcanic rocks in the Dennys, Edmunds, and Leighton Formations formed in a continental arc environment, in contrast to some earlier interpretations. These rocks have a continuous compositional range from basalt, through andesite, to rhyolite. The mafi c rocks in these formations are calc-alkaline and show subduction-related geochemical signatures on various discrimination diagrams, whereas the felsic rocks have geochemical characteristics of volcanic arc granites. In contrast, the thick volcanic deposits of the younger Late Silurian Eastport Formation are bimodal and tholeiitic and have transitional to within-plate geochemical signatures. Thus, the transition over time, as the Acadian seaway closed, from subduction and arc settings to continental extension can been seen in this rock sequence, and it constrains the time of Avalonia's docking. Regionally, vol canic rocks in the Kingston terrane of southern New Brunswick are likely correlatives of the earlier arc-volcanic rocks (Dennys, Edmunds, and Leighton Formations), while Eastport Formation analogues are found in the coastal Maine magmatic province, Cranberry Island series, and probably the Passama quoddy Bay volcanic series, which similarly appear to have formed after the transition to an extensional environment occurred, although other extensional settings cannot be entirely ruled out. Basalts in the post-Acadian Perry Formation indicate continental extension was also active in the Late Devonian.

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Section: Implications For Tectonic Settingsupporting

confidence: 64%

Section: Regional Correlationsmentioning

confidence: 71%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemistry of Silurian-Devonian volcanic rocks in the Coastal Volcanic belt, Machias-Eastport area, Maine: Evidence for a pre-Acadian arc

Llamas¹,

Hepburn²

2013

Geological Society of America Bulletin

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“…444-359 Ma) occur throughout the Gaspé Peninsula ( Fig. 1) and coeval bimodal volcanic centers also occur to the south in New Brunswick and Maine (Seaman et al 1999;Van Wagoner et al 2002). These Silurian and Devonian volcanic rocks erupted over an extended time span during the period of relative tectonic quiescence between the Ordovician Taconian (ca.…”

Section: Introductionmentioning

confidence: 95%

Geochemistry of Sainte-Marguerite volcanic rocks: implications for the evolution of Silurian–Devonian volcanism in the Gaspé Peninsula

D’hulst¹,

Beaudoin²,

Malo³

et al. 2008

Can. J. Earth Sci.

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The Lower Devonian Sainte-Marguerite volcanic rocks are part of a Silurian-Devonian volcanic sequence deposited between the Taconian and Acadian orogenies in the Gaspé Peninsula, Quebec, Canada. The Sainte-Marguerite unit includes basaltic and dacitic lava flows with calc-alkaline and volcanic-arc affinities. Such affinities are also recorded by the trace-element signature in Lower Silurian and most Lower Devonian volcanic units of the Gaspé Peninsula. However, most of the other Silurian-Devonian volcanic rocks occurring in the Gaspé Peninsula have been previously interpreted to have erupted in an intracontinental setting. A back-arc setting for the Gaspé Peninsula between the Taconian and Acadian orogenies could account for these subduction volcanic-arc signatures, though a metasomatized lithospheric mantle magma source, unrelated to subduction, cannot be excluded. Lower Silurian and Lower Devonian volcanic rocks in the central part of the Gaspé Peninsula show an arc affinity, whereas Upper Silurian and Lower to Middle Devonian volcanic rocks, located in the south and north of the Gaspé Peninsula, respectively, show a withinplate affinity. The Lower Devonian Archibald Settlement and Boutet volcanic rocks of the southern and northern Gaspé Peninsula, respectively, show a trend toward a within-plate affinity. This suggests that within-plate volcanism migrated from south to north through time in an evolving back-arc environment and that the subduction signature of Lower Silurian and Lower Devonian rocks results from a source that melted only under the central part of the Gaspé Peninsula.Résumé : Les roches volcaniques du Dévonien inférieur de Sainte-Marguerite font partie d'une séquence volcanique silurodévonienne dont l'éruption s'est produite entre les orogenèses taconienne et acadienne en Gaspésie, Québec, Canada. Les roches volcaniques de Sainte-Marguerite sont constituées de roches basaltiques et dacitiques présentant une affinité calco-alcaline et d'arc volcanique. Cette signature en éléments traces est aussi observée dans les roches volcaniques du Silurien inférieur et la plupart des roches du Dévonien inférieur de Gaspésie. Cependant, un environnement intraplaque a été proposé pour la majorité des roches volcaniques siluro-dévoniennes de la Gaspésie. On propose que la Gaspésie fût située dans un environnement d'arrière-arc à cette époque mais une source magmatique métasomatisée préexistante dans le manteau lithosphérique sous-jacent, non reliée à de la subduction, ne peut être exclue. Les roches volcaniques du Silurien inférieur et du Dévonien inférieur, dans la partie centrale de la Gaspésie, montrent une affinité d'arc tandis que les roches du Silurien supérieur au sud et du Dévonien moyen au nord montrent une affinité intra-plaque. Les roches volcaniques du Dévonien inférieur des secteurs d'Archibald Settlement et de Boutet, situées respectivement au sud et au nord de la Gaspésie, montrent une tendance vers une affinité intra-plaque. Ceci suggère que le volcanisme intra-plaque a migré du sud au nord à tr...

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