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Blanchet Island

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Figure 1. Location map with detail of transect locations on Blanchet Island. Geologic map based on Map 1628A, Geological Survey of Canada (Hoffman and Kurfurst, 1988).

Figure 1. Location map with detail of transect locations on Blanchet Island... Available to Purchase

Published: 01 May 2004
Figure 1. Location map with detail of transect locations on Blanchet Island. Geologic map based on Map 1628A, Geological Survey of Canada ( Hoffman and Kurfurst, 1988 ).
Image
Photomicrographs of dolomite-filled molds, Blanchet Island. A) Multiple examples showing euhedral gypsum or quartz within dolomite crystals. Scale bar is 0.5 mm. B) Close-up of euhedral crystal of quartz showing zoned growth. Scale bar is 0.1 mm.

Photomicrographs of dolomite-filled molds, Blanchet Island. A) Multiple e... Available to Purchase

Published: 01 March 2003
Figure 10 Photomicrographs of dolomite-filled molds, Blanchet Island. A) Multiple examples showing euhedral gypsum or quartz within dolomite crystals. Scale bar is 0.5 mm. B) Close-up of euhedral crystal of quartz showing zoned growth. Scale bar is 0.1 mm.
Image
Halite pseudomorphs of the Stark Formation. A) Dolomite-filled cubic casts standing out in relief above the siltstone and shale matrix, near Pte a Tuer. B) Close-up of displacive, unfilled cubic casts in siltstone and shale, Blanchet Island. C) Pagoda halite (indicated by arrows) with successive growth of halite occurs from the corners of the initial crystal, southwestern end of Blanchet Island. D) Photomicrograph of cubic casts filled with coarse dolomite in siliciclastic mudstone matrix, Blanchet Island. Scale bar is ∼ 0.5 mm.

Halite pseudomorphs of the Stark Formation. A) Dolomite-filled cubic cast... Available to Purchase

Published: 01 March 2003
Figure 9 Halite pseudomorphs of the Stark Formation. A) Dolomite-filled cubic casts standing out in relief above the siltstone and shale matrix, near Pte a Tuer. B) Close-up of displacive, unfilled cubic casts in siltstone and shale, Blanchet Island. C) Pagoda halite (indicated by arrows
Image
–Relatively thin graywacke turbidites interbedded with distal-limestone rhythmite, Blanchet Formation, Blanchet Island. More typical thick graywacke bed is in upper right corner of photograph. Discoloration of graywacke is result of baking during intrusion of quartz diorite laccolith.

–Relatively thin graywacke turbidites interbedded with distal-limestone rhy... Available to Purchase

Published: 01 May 1974
Fig. 15 –Relatively thin graywacke turbidites interbedded with distal-limestone rhythmite, Blanchet Formation, Blanchet Island. More typical thick graywacke bed is in upper right corner of photograph. Discoloration of graywacke is result of baking during intrusion of quartz diorite laccolith.
Image
–Distal-limestone rhythmite of basin-slope facies, Pekanatui Point Formation, Blanchet Island. This finely laminated rhythmite is basinward of proximal rhythmite in Figure 12.

–Distal-limestone rhythmite of basin-slope facies, Pekanatui Point Formatio... Available to Purchase

Published: 01 May 1974
Fig. 13 –Distal-limestone rhythmite of basin-slope facies, Pekanatui Point Formation, Blanchet Island. This finely laminated rhythmite is basinward of proximal rhythmite in Figure 12 .
Image
–Relations of columnar stromatolite mounds and crossbedded intraclast grainstone of mound-and-channel belt, as exposed in Taltheilei Formation, Blanchet Island. Note scale in lower right.

–Relations of columnar stromatolite mounds and crossbedded intraclast grain... Available to Purchase

Published: 01 May 1974
Fig. 17 –Relations of columnar stromatolite mounds and crossbedded intraclast grainstone of mound-and-channel belt, as exposed in Taltheilei Formation, Blanchet Island. Note scale in lower right.
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–Proximal limestone rhythmite of basin-slope facies, Pekanatui Point Formation, Blanchet Island. Thin laterally persistent beds of fine-grained limestone are separated by partings of dark siliciclastic mudstone.

–Proximal limestone rhythmite of basin-slope facies, Pekanatui Point Format... Available to Purchase

Published: 01 May 1974
Fig. 12 –Proximal limestone rhythmite of basin-slope facies, Pekanatui Point Formation, Blanchet Island. Thin laterally persistent beds of fine-grained limestone are separated by partings of dark siliciclastic mudstone.
Image
—Columnar stromatolites of basin-floor facies, McLean Formation, Blanchet Island. Columns are circular in plan view and composed of limestone precipitated in situ against background of siliciclastic mud deposition. The synoptic relief of columns may be judged where they are buried by flat-topped beds of light-gray mechanically deposited carbonate. Scale in this and succeeding photographs is graduated in tenths of feet.

—Columnar stromatolites of basin-floor facies, McLean Formation, Blanchet I... Available to Purchase

Published: 01 May 1974
Fig. 10 —Columnar stromatolites of basin-floor facies, McLean Formation, Blanchet Island. Columns are circular in plan view and composed of limestone precipitated in situ against background of siliciclastic mud deposition. The synoptic relief of columns may be judged where they are buried by flat
Image
—Alternating incipient columnar stromatolites of basin-floor facies and distal-limestone rhythmites of basin-slope facies, McLean Formation, Blanchet Island. Crenulation of rhythmites is result of differential compaction of dark mudstone and stunted calcareous stromatolite columns. This alternation of facies occurs near featheredge of basin-slope rhythmite tongue in front of Taltheilei platform (see Fig. 3).

—Alternating incipient columnar stromatolites of basin-floor facies and dis... Available to Purchase

Published: 01 May 1974
Fig. 11 —Alternating incipient columnar stromatolites of basin-floor facies and distal-limestone rhythmites of basin-slope facies, McLean Formation, Blanchet Island. Crenulation of rhythmites is result of differential compaction of dark mudstone and stunted calcareous stromatolite columns
Image
A) Location map showing the Archean Slave craton surrounded by three synchronous Paleoproterozoic basins: Wopmay Orogen, Kilihigok Basin, and the Athapuscow Basin of the Great Slave Lake area (inset map). GBL = Great Bear Lake; CG = Coronation Gulf; BI = Bathurst Inlet. B) Simplified geologic map, Athapuscow Basin, East Arm of Great Slave Lake (modified from Hoffman 1988). The Great Slave Lake Supergroup crops out in a gently south-plunging synclinorium with shallow dips on the northwest limb and steep, in many places overturned, and thrusted limbs, on the southeast limb. Areas of uppermost Pethei Group and Stark Formation outcrops studied are shown in black. BI, Blanchet Island; ET, Et-then Island; PT, Pte a Tuer; PP, Pethei Peninsula; TB, Tochatwi Bay; SL, Stark Lake; BL, Belle Island; CI, Caribou Islands. The Blanchet Bay area is outlined by the irregular rectangle. C) Generalized stratigraphic column in the upper right shows the inferred correlation of units and phases of basin development in the Wopmay Orgogen, the Kilihigok Basin, and the Athapuscow Basin (modified from Hoffman 1988; Hoffman and Grotzinger 1993; Bowring and Grotzinger 1992).

A) Location map showing the Archean Slave craton surrounded by three synch... Available to Purchase

Published: 01 March 2003
of uppermost Pethei Group and Stark Formation outcrops studied are shown in black. BI, Blanchet Island; ET, Et-then Island; PT, Pte a Tuer; PP, Pethei Peninsula; TB, Tochatwi Bay; SL, Stark Lake; BL, Belle Island; CI, Caribou Islands. The Blanchet Bay area is outlined by the irregular rectangle. C
Image
Varied products of Seton volcanism in the northern autochthon (A, B), southern autochthon (C, D), and allochthonous central nappe (E, F). (A) Columnar joints in felsic lava plug or hypabyssal intrusion, small island NE of Blanchet Island. (B) Cooling unit of felsic, weakly- to moderately-welded, lithic-vitric ash-flow tuff, Sachowia cauldron (near 14° dip symbol in Fig. 8). (C) Agglomerate (phreatic cinder-cone?), first island west of Seton Island. (D) Volcaniclastic conglomerate of amygdaloidal lava and tuff clasts, western Seton Island. (E) Subaqueous hyaloclastite breccia in mafic lava, basin-facies allochthon north of Basile Bay. (F) Mafic pillow lava in basin-facies allochthon north of Basile Bay. The length of the hammer (circled) is 33.5 cm and the pen is 15 cm. All images by author PFH.

Varied products of Seton volcanism in the northern autochthon (A, B), south... Available to Purchase

Published: 01 May 2023
Fig. 4. Varied products of Seton volcanism in the northern autochthon (A, B), southern autochthon (C, D), and allochthonous central nappe (E, F). (A) Columnar joints in felsic lava plug or hypabyssal intrusion, small island NE of Blanchet Island. (B) Cooling unit of felsic, weakly- to moderately
Image
Petitot Islands diatreme dyke (A−C) in Simpson Islands block (Fig. 2) and contact metamorphism (D) related to a Compton laccolith intrusion. (A) Petitot Islands breccia dyke (Fig. 2): clasts of basement grandiorite set in a chloritic matrix of comminuted rock debris. The pen (circled) is 15 cm long. Shattered country rock (Archean paragneiss) is in the lower part of the image. (B) Petitot Islands breccia dyke with subrounded clasts (dashed outlines) of pinkish dolostone breccia characteristic of Stark Formation. (C) Reddish siltstone clast from within Petitot Island breccia dyke with hopper-shaped halite casts characteristic of the Stark Formation. The presence of the Stark Formation and the absence of Kahochella or Pethei Group clasts favour upward clast displacement. This implies that the Simpson Islands block is allochthonous and was thrust over the Stark Formation megabreccia. (D) Tremolite marble in the upper Pethei Group (Pekanatui Point Formation) in the metamorphic aureole of Compton laccolith on Blanchet Island. All images by author PFH.

Petitot Islands diatreme dyke (A−C) in Simpson Islands block ( Fig. 2 ) and... Available to Purchase

Published: 01 May 2023
) Tremolite marble in the upper Pethei Group (Pekanatui Point Formation) in the metamorphic aureole of Compton laccolith on Blanchet Island. All images by author PFH.
Image
Compton laccolithic intrusive suite (Figs. 2 and 3) and its contact relations. (A) Typical plagioclase–hornblende–biotite–phyric quartz–monzodiorite in laccolith interior, eastern Stark Lake (Fig. 2). The scale bar (upper right) is 1.0 cm. (B) Characteristic autobrecciated border phase related to synmagmatic laccolith inflation. Pen (circled) for scale in B and C. (C) Contact with Stark Fm megabreccia, SW Caribou Islands. Note the breccia clasts of baked siltstone (Stark Fm, grey) and chilled diorite (red). Such diorite clasts led some to infer a basement origin for the laccolith north of Murky Channel (Fig. 2) (Barnes 1951; Stockwell et al. 1968). Physical mixing of chilled border-zone diorite breccia and ambient Stark Fm solution-collapse breccia during laccolith inflation accounts for contact metamorphism that turned normally red-coloured Stark Fm siltstone blocks to grey within meters of the laccolith contact. (D) Contact between the floor of a laccolith (Cis) and underlying basin-facies upper Pethei Group (Ppb, Blanchet Fm), Compton Lake. The arrow indicates the actual and stratigraphic way up. Laccolith border phase is brecciated and Pethei Group is baked but little disturbed. (E) Bowls and circular ridges on a laccolith floor, NW Blanchet Island, inferred as a synmagmatic Rayleigh−Taylor instability, activated by thermal softening of the underlying upper Pethei Group (Pp), comprised of rhythmically interbedded limestone and fine-grained greywacke-siltstone. Beneath laccolith bowls, terrigenous beds ranging in thickness from millimeters to decimeters responded to bed-parallel stretching by extreme boudinage, accommodated by less-resistant limestone. The horizontal distance between the Pethei antiforms shown is 0.5 km and coordinates of the bowl between them are 61.982°/−112.664°. (F) In pinched antiforms between Rayleigh−Taylor bowls, bed-parallel shortening caused boudins to imbricate in layer-by-layer thrust duplexes, which were then folded. Thrust duplexing is consistently lower-left over upper-right in this image. The strain progression—bed-parallel stretching followed by bed-parallel shortening—is unique to metamorphic aureoles where Rayleigh−Taylor instability occurred during laccolith emplacement. All images by author PFH.

Compton laccolithic intrusive suite ( Figs. 2 and 3 ) and its contact rel... Available to Purchase

Published: 01 May 2023
but little disturbed. (E) Bowls and circular ridges on a laccolith floor, NW Blanchet Island, inferred as a synmagmatic Rayleigh−Taylor instability, activated by thermal softening of the underlying upper Pethei Group (Pp), comprised of rhythmically interbedded limestone and fine-grained greywacke-siltstone
Journal Article

Shallow and Deepwater Stromatolites in Lower Proterozoic Platform–to–Basin Facies Change, Great Slave Lake, Canada Available to Purchase

Paul Hoffman
Journal: AAPG Bulletin
Published: 01 May 1974
AAPG Bulletin (1974) 58 (5): 856–867.
DOI: https://doi.org/10.1306/83D914A7-16C7-11D7-8645000102C1865D
...Fig. 15 –Relatively thin graywacke turbidites interbedded with distal-limestone rhythmite, Blanchet Formation, Blanchet Island. More typical thick graywacke bed is in upper right corner of photograph. Discoloration of graywacke is result of baking during intrusion of quartz diorite laccolith. ...
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View PDF for article title, Shallow and Deepwater Stromatolites in Lower Proterozoic Platform–to–Basin Facies Change, Great Slave Lake, Canada
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Crustal eduction and slab-failure magmatism in an Orosirian (2.05–1.80 Ga) postcollisional cratonic foredeep: geochronology of Seton volcanics and Compton laccoliths, Tu Cho (Great Slave Lake), NWT, Canada Available to Purchase

Paul F. Hoffman, Francis A. Macdonald, Samuel A. Bowring, Jahandar Ramezani, Robert Buchwaldt, Robert S. Hildebrand, Joseph B. Whalen
Published: 01 May 2023
Canadian Journal of Earth Sciences (2023) 60 (10): 1359–1384.
DOI: https://doi.org/10.1139/cjes-2023-0011
...Fig. 4. Varied products of Seton volcanism in the northern autochthon (A, B), southern autochthon (C, D), and allochthonous central nappe (E, F). (A) Columnar joints in felsic lava plug or hypabyssal intrusion, small island NE of Blanchet Island. (B) Cooling unit of felsic, weakly- to moderately...
FIGURES
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View PDF for article title, Crustal eduction and slab-failure magmatism in an Orosirian (2.05–1.80 Ga) postcollisional cratonic foredeep: geochronology of Seton volcanics and Compton laccoliths, Tu Cho (Great Slave Lake), NWT, Canada
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Journal Article

Paleoproterozoic Stark Formation, Athapuscow Basin, Northwest Canada: Record of Cratonic-Scale Salinity Crisis Available to Purchase

Michael C. Pope, John P. Grotzinger
Published: 01 March 2003
Journal of Sedimentary Research (2003) 73 (2): 280–295.
DOI: https://doi.org/10.1306/091302730280
...Figure 10 Photomicrographs of dolomite-filled molds, Blanchet Island. A) Multiple examples showing euhedral gypsum or quartz within dolomite crystals. Scale bar is 0.5 mm. B) Close-up of euhedral crystal of quartz showing zoned growth. Scale bar is 0.1 mm. ...
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Un profil complet d'une marge active de l'Ouest Pacifique; le systeme des Mariannes Leg 60 (D.S.D.P.) Available to Purchase

R. Blanchet, D. Hussong, S. Uyeda, U. Bleil, C. H. Ellis, T. J. G. Francis, P. Fryer, K. Horai, S. Kling, A. Meijer, K. Nakamura, J. Natland, G. Packam, A. Sharaskin
Published: 01 January 1979
Bulletin de la Société Géologique de France (1979) S7-XXI (5): 529–532.
DOI: https://doi.org/10.2113/gssgfbull.S7-XXI.5.529
...R. Blanchet; D. Hussong; S. Uyeda; U. Bleil; C. H. Ellis; T. J. G. Francis; P. Fryer; K. Horai; S. Kling; A. Meijer; K. Nakamura; J. Natland; G. Packam; A. Sharaskin GeoRef, Copyright 2004, American Geological Institute. 1979 Cenozoic Deep Sea Drilling Project IPOD island arcs Leg 60...
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Petrologie, geochimie et signification geodynamique de quelques formations volcaniques cretacees pericaraibes Available to Purchase

Danielle Girard, C. Beck, J. F. Stephan, R. Blanchet, R. C. Maury
Published: 01 January 1982
Bulletin de la Société Géologique de France (1982) S7-XXIV (3): 535–544.
DOI: https://doi.org/10.2113/gssgfbull.S7-XXIV.3.535
...Danielle Girard; C. Beck; J. F. Stephan; R. Blanchet; R. C. Maury alkali basalts Alpine Orogeny Antilles basalts Caribbean region Central America chain silicates clinopyroxene Costa Rica Cretaceous Eastern Venezuela Greater Antilles igneous rocks island arcs major elements...
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Les marges actives des oceans Available to Purchase

Rene Blanchet
Published: 01 January 1984
Bulletin de la Société Géologique de France (1984) S7-XXVI (3): 533–549.
DOI: https://doi.org/10.2113/gssgfbull.S7-XXVI.3.533
...Rene Blanchet GeoRef, Copyright 2013, American Geosciences Institute. 1984 accretion active margins Asia Atlantic Ocean Caribbean Sea decollement Deep Sea Drilling Project deformation DSDP Site 452 East Pacific Far East fold belts global IPOD Leg 56 Leg 60 Leg 66 Leg 78A...
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Deciphering the geodynamic evolution of the Dinaric orogen through the study of the ‘overstepping’ Cretaceous successions Available to Purchase

Giuseppe Nirta, Martin Aberhan, Valerio Bortolotti, Nicolaos Carras, Francesco Menna, Milvio Fazzuoli
Published: 15 June 2020
Geological Magazine (2020) 157 (8): 1238–1264.
DOI: https://doi.org/10.1017/S001675682000045X
... with a Tithonian–Berriasian fauna and ophiolite- and continent-derived clasts including Upper Permian granite, which passes upwards into a succession consisting of bioclastic limestones, calcareous breccia and pelagic limestones of early Albian to late Santonian age (Jovanović, 1961 ; Blanchet et al . 1970...
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