Massive dolomitization of a pinnacle reef in the Lower Devonian West Point Formation (Gaspé Peninsula, Quebec): An extreme case of hydrothermal dolomitization through fault-focused circulation of magmatic fluids

AAPG Bulletin ◽  
2010 ◽  
Vol 94 (4) ◽  
pp. 513-531 ◽  
Author(s):  
D. Lavoie ◽  
G. Chi ◽  
M. Urbatsch ◽  
W. J. Davis
Keyword(s):  
Lower Devonian ◽  
Extreme Case ◽  
West Point ◽  
Magmatic Fluids ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

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

2008 ◽  
Vol 45 (1) ◽  
pp. 15-29 ◽  
Author(s):  
Alan D’hulst ◽  
Georges Beaudoin ◽  
Michel Malo ◽  
Marc Constantin ◽  
Pierre Pilote
Keyword(s):  
Lower Devonian ◽  
Volcanic Rocks ◽  
Magma Source ◽  
Volcanic Arc ◽  
Lower Silurian ◽  
Trace Element Signature ◽  
Arc Setting ◽  
Back Arc ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

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 within-plate 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.

scholarly journals Spines of the stem chondrichthyan Doliodus latispinosus (Whiteaves) comb. nov. from the Lower Devonian of eastern Canada

2017 ◽  
Vol 54 (12) ◽  
pp. 1248-1262 ◽  
Author(s):  
Carole J. Burrow ◽  
Susan Turner ◽  
John G. Maisey ◽  
Sylvain Desbiens ◽  
Randall F. Miller
Keyword(s):  
New Brunswick ◽  
Lower Devonian ◽  
Phylogenetic Position ◽  
Eastern Canada ◽  
Late 19Th Century ◽  
Spine Morphology ◽  
Red Sandstone ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula ◽  
Fin Spines

The higher taxonomic affinities of fin spines from the Lower Devonian (Emsian) Atholville beds, Campbellton Formation, near Campbellton, New Brunswick, Canada, originally identified as Ctenacanthus latispinosus, have been uncertain since they were first described by Whiteaves in the late 19th century. Woodward subsequently referred the species to Climatius, because the isolated Canadian fin spines were similar to those preserved in articulated specimens of Climatius reticulatus from the Lower Old Red Sandstone (Lochkovian) of Scotland. Spines of the same form as the Atholville beds specimens are also found in Emsian mudstones on the Gaspé Peninsula, Québec. One of the fin spine forms appears identical to the pectoral fin spines on an articulated specimen from the Campbellton Formation that has been assigned to the stem chondrichthyan Doliodus problematicus, a taxon erected for isolated diplodont teeth. By comparison with median and paired fin spine morphology on the climatiiform Climatius reticulatus from the Scottish Lower Old Red Sandstone and the spines preserved on the articulated Doliodus, isolated fin spines from Campbellton and several localities on the Gaspé Peninsula are now identified as belonging to Doliodus latispinosus comb. nov. The variety of spine morphotypes recognized—pectoral, prepelvic, prepectoral, and median—support a phylogenetic position within the “acanthodians” rather than “conventionally defined chondrichthyans”.

Halysitid and auloporid tabulate corals from the Gascons and West Point Formations (Silurian), Gaspé, Québec, Canada

1991 ◽  
Vol 65 (5) ◽  
pp. 715-726 ◽  
Author(s):  
Graham A. Young ◽  
Dong-Jin Lee ◽  
James P. A. Noble
Keyword(s):  
New Species ◽  
Environmental Conditions ◽  
West Point ◽  
Reef Facies ◽  
Lower Silurian ◽  
Upper Silurian ◽  
High Degree ◽  
Gaspe Peninsula ◽  
Tabulate Corals ◽  
Gaspé Peninsula

The uppermost Lower Silurian and Upper Silurian Gascons and West Point Formations of the southern Gaspé Peninsula were deposited under a broad range of environmental conditions from deep offshore-shelf to reef facies. Halysitid and auloporid tabulate corals occur in a number of facies and show a high degree of endemism.Two species of Halysitidae and three species of Auloporida are found in these formations. Both halysitids have been previously described from this region. The auloporids include the new species Syringopora minuta and another species that may represent the first known Silurian occurrence of the fletcheriellid genus Pseudofletcheria. A neotype for the halysitid Cystihalysites amplitubulatus (Lambe) is proposed.

Biostratigraphic significance of lower Paleozoic microfaunas from eastern Canada

2004 ◽  
Vol 41 (5) ◽  
pp. 489-505 ◽  
Author(s):  
Esther Asselin ◽  
Aïcha Achab ◽  
Azzedine Soufiane
Keyword(s):  
New Brunswick ◽  
Lower Devonian ◽  
Head Group ◽  
Upper Ordovician ◽  
Eastern Canada ◽  
Lower Paleozoic ◽  
Anticosti Island ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula ◽  
Mapping Program

Chitinozoan studies recently carried out in the “Appalachian Forelands and St. Lawrence Platform” National Geoscience Mapping Program (NATMAP) project have confirmed the regional biostratigraphic value of a number of chitinozoan species and led to a better documentation of their stratigraphic and geographic distribution in eastern Canada. The typical Darriwilian microfaunas first described from the Table Head Group of western Newfoundland and containing Conochitina chydaea are now recognised in the Rivière Ouelle Formation at Les Méchins, Gaspé Peninsula. In the Upper Ordovician successions of the St. Lawrence Platform at Neuville and in the Charlevoix area, Quebec, Conochitina primitiva is indicative of the multidens–pre-americanus graptolite zonal range, Hercochitina duplicitas of the americanus Zone, and Hercochitina spinetum and Acanthochitina cancellata characterize the ruedemanni – lower spiniferus zonal interval. The occurrence of Cyathochitina vaurealensis and Hercochitina crickmayi in turbidite deposits of the Grog Brook Group of northwestern New Brunswick confirms the minimal facies dependence of these two Richmondian index species. Eisenackitina dolioliformis, characteristic of the late Aeronian and Telychian successions of Arctic Canada, Gaspé Peninsula, and Anticosti Island, is now recognised in samples from the Upsalquitch Formation of northwestern New Brunswick and the Cabano Formation of the Rimouski area in Quebec. The palynological data from Devonian successions of the Matapedia Valley, the Rimouski area, and the Beauce – Eastern Townships region show that the succession of Lower Devonian chitinozoan assemblages of the Forillon Peninsula based on short-ranging species can be used in establishing regional correlations in the Gaspé Belt.

scholarly journals Fossil crinoids from the basal West Point Formation (Silurian), southeast Gaspé Peninsula, Québec, eastern Canada

2016 ◽  
Vol 52 ◽  
pp. 211 ◽  
Author(s):  
Stephen K. Donovan ◽  
David G. Keighley
Keyword(s):  
West Point ◽  
Atlantic Canada ◽  
Upper Ordovician ◽  
Eastern Canada ◽  
North Wales ◽  
Stratigraphic Position ◽  
The Common ◽  
Upper Silurian ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

Silurian strata of Atlantic Canada and southern Québec locally preserve common fossil crinoids, albeit mostly as disarticulated remains. New crinoids from the Chaleurs Group, West Point Formation (Ludlow to Pridoli?; Upper Silurian) of the Gaspé Peninsula include Iocrinus? maennili (Yeltysheva) (otherwise known from the Katian of Estonia), Bystrowicrinus (col.) depressus sp. nov. and Cyclocyclicus (col.) sp. aἀ. C. (col.) echinus Donovan. On the basis of both its gross morphology and stratigraphic position, Iocrinus? maennili is unlikely to be an iocrinid disparid, a family that became extinct at the end of the Ordovician. The trivial name has hitherto been erroneously spelled as männili, mannili and mjannili. Most specimens of the common Bystrowicrinus (col.) depressus appear cyclocyclic because the pentastellate lumen occurs in a deeply sunken claustrum that is commonly occluded by sediment; clean specimens are highly distinctive. Cyclocyclicus (col.) sp. aἀ. C. (col.) echinus is similar to a species known from the Katian of North Wales. Taken together, this assemblage is more reminiscent of Katian strata (Upper Ordovician). Ḁis is problematic given the current mapping of the outcrop as West Point Formation (Upper Silurian), suggesting further stratigraphic studies in the area are required.

The Lower Devonian Compton Formation in southern Quebec: from delta front to pro-delta sedimentation

2004 ◽  
Vol 41 (5) ◽  
pp. 571-585 ◽  
Author(s):  
Denis Lavoie
Keyword(s):  
Lower Devonian ◽  
Sedimentary Facies ◽  
High Energy ◽  
Delta Front ◽  
Storm Wave ◽  
Connecticut Valley ◽  
Indian Point ◽  
Delta Sediments ◽  
Gaspe Peninsula ◽  
Gaspé Peninsula

The Lower Devonian Compton Formation is the uppermost unit of the St. Francis Group in the Connecticut Valley – Gaspé synclinorium of southern Quebec. The Compton Formation is composed of three informal members. Five distinct sedimentary facies have been recognized in the lower two members of the Compton Formation. High-energy, shallow-marine, and channel sands dominate the Milan member. The overlying Lac Drolet member consists of below wave base mud and silt deposits with abundant turbidite sand. The Milan member is interpreted to represent deposits of a river-dominated delta-front environment, whereas the Lac Drolet member is suggestive of below storm-wave base pro-delta deposits. The transition from the Milan member to the Lac Drolet member is correlated with the deepening event recognized in coeval succession in the Gaspé Peninsula and known as the T2 event. There, the coeval Indian Point Formation is interpreted to represent pro-delta sediments. The new paleogeographic map for the Lochkovian illustrates the development of deltaic lobes from northern Gaspé to southern Quebec. In Lochkovian, deltaic regimes were established in southern Quebec and northeastern Gaspé, whereas the intervening successions (western Gaspé Peninsula – New Brunswick) experienced significant synsedimentary tectonic collapse.

scholarly journals The Lac au Renard Tephra Cluster: a record of Lochkovian (Lower Devonian) volcanism in the Indian Point Formation, Gaspe Peninsula, Quebec, Canada

2019 ◽  
Vol 55 ◽  
pp. 361-378
Author(s):  
James R. Ebert ◽  
Damon K. Matteson
Keyword(s):  
New York ◽  
Lower Devonian ◽  
Age Determination ◽  
Volcanic Source ◽  
Tephra Beds ◽  
Indian Point ◽  
Gaspe Peninsula ◽  
Helderberg Group ◽  
Gaspé Peninsula

Approximately twenty tephra beds, comprising the Lac au Renard Tephra Cluster (new), occur in the Rosebush Cove and Petit Portage members of the Indian Point Formation (Chaleurs Group) on the Gaspe Peninsula of Quebec, Canada. The tephra beds range in thickness from <1.0 cm to 82 cm and occur in a mudrock-dominated sequence with coarser tempestite interbeds. Mineralogically and texturally graded accumulations of phenocrysts mark the bases of the thickest tephra beds. Early diagenetic concretions in one composite tephra preserve pre-compaction fabrics and original hypocrystalline textures with microphenocrysts and devitrified glass shards. The presence of plagioclase, quartz, K-feldspar, biotite, apatite, and zircon suggest a rhyolitic source. The coarseness of the microphenocrysts in the basal accumulations, along with the abundance and thickness of the tephras, suggest that deposition in the Gaspe area was in a proximal position relative to the volcanic source. The zonal graptolites Monograptus praehercynicus and Monograptus aequabilis ssp. from the Petit Portage Member indicate a middle Lochkovian age for the Lac au Renard Tephra Cluster of the Indian Point Formation. Correlation with the tephra cluster that includes the Judds Falls Bentonite in the New Scotland Formation and other possible tephras in the Kalkberg Formation (Helderberg Group) of New York and the Corriganville and Mandata formations of Pennsylvania is likely. The graptolite fauna of the Indian Point and probable correlations to New York may provide additional biostratigraphic constraints on a U–Pb zircon radiometric age determination of 417.6 Ma from New York that has been used to estimate the age of the Silurian–Devonian boundary.

Lithostratigraphic Framework and Unified Nomenclature for Silurian and Basal Devonian Rocks in Eastern Gaspé Peninsula, Québec

1975 ◽  
Vol 12 (5) ◽  
pp. 858-872 ◽  
Author(s):  
Pierre-André Bourque
Keyword(s):  
West Point ◽  
The West ◽  
Fine Grained ◽  
Lithostratigraphic Units ◽  
Indian Point ◽  
Stratigraphic Nomenclature ◽  
Gaspe Peninsula ◽  
Eastern Half ◽  
Gaspé Peninsula

A unified stratigraphic nomenclature is proposed for Silurian and basal Devonian rocks in the eastern half of Gaspé Peninsula. The Gascons, West Point and Indian Point Formations of the Chaleurs Bay Synclinorium are extended into the northern part of Gaspé Peninsula. The term St. Léon is restricted to a sequence of mainly fine-grained sediments in which neither the West Point nor the Bouleaux is recognized. The term Lefrançois is abandoned. New lithostratigraphic units here proposed are the Anse à Pierre-Loiselle Formation in the Chaleurs Bay Synclinorium, the Ruisseau Bleau Formation and the Lac McKay Member of the St. Léon Formation in the Mount Alexandre Syncline, and the Ruisseau Louis Member of the St. Léon Formation in the Saint-Jean River Anticline and Mount Alexandre Syncline.

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