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Confederation Assemblage

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Distribution of the Confederation assemblage arc and back-arc volcanic rocks.

Distribution of the Confederation assemblage arc and back-arc volcanic rock... Available to Purchase

Published: 23 May 2024
Fig. 17. Distribution of the Confederation assemblage arc and back-arc volcanic rocks.
Journal Article

Geochemistry, geochronology, and radiogenic isotopes of the Balmer and Confederation assemblages of the Laird Lake Area, Red Lake greenstone belt, Canada: implications for Archean tectonic evolution Available to Purchase

Brigitte R. Gélinas, Pete Hollings, Richard Friedman
Published: 23 May 2024
Canadian Journal of Earth Sciences (2024) 61 (6): 686–711.
DOI: https://doi.org/10.1139/cjes-2023-0122
...Fig. 17. Distribution of the Confederation assemblage arc and back-arc volcanic rocks. ...
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View PDF for article title, Geochemistry, geochronology, and radiogenic isotopes of the Balmer and <span class="search-highlight">Confederation</span> <span class="search-highlight">assemblages</span> of the Laird Lake Area, Red Lake greenstone belt, Canada: implications for Archean tectonic evolution
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Add to Citation Manager for Geochemistry, geochronology, and radiogenic isotopes of the Balmer and <span class="search-highlight">Confederation</span> <span class="search-highlight">assemblages</span> of the Laird Lake Area, Red Lake greenstone belt, Canada: implications for Archean tectonic evolution
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Journal Article

Pickle Lake revisited: New structural, geochronological and geochemical constraints on greenstone belt assembly, western Superior Province, Canada, Available to Purchase

M.D. Young, V. McNicoll, H. Helmstaedt, T. Skulski, J.A. Percival
Published: 13 September 2006
Canadian Journal of Earth Sciences (2006) 43 (7): 821–847.
DOI: https://doi.org/10.1139/e06-036
... interbedded with southeast-younging pillowed basalt, previously inferred to be part of the Pickle Crow assemblage, yielded U–Pb zircon ages of Ma and 2729 ± 3 Ma. These rocks are thus part of the younger Confederation assemblage, which consists of intercalated basalt and dacite ( N d 2.74 Ga = +0.1 to +0.8...
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View PDF for article title, Pickle Lake revisited: New structural, geochronological and geochemical constraints on greenstone belt assembly, western Superior Province, Canada,
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Imaging the upper part of the Red Lake greenstone belt, northwestern Ontario, with 3-D traveltime tomography, Available to Purchase

Fafu Zeng, Andrew J. Calvert
Published: 21 July 2006
Canadian Journal of Earth Sciences (2006) 43 (7): 849–863.
DOI: https://doi.org/10.1139/e06-027
..., clearly distinguishable from the lower velocities of 5.1–6.1 km s −1 of the Neoarchean Confederation assemblage. Although the overall range of velocities in the metasedimentary rocks of the English River subprovince is similar to that found in the Confederation assemblage, lower velocities of 5.1–5.4 km s...
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View PDF for article title, Imaging the upper part of the Red Lake greenstone belt, northwestern Ontario, with 3-D traveltime tomography,
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Trace element geochemistry of the Meen– Dempster greenstone belt, Uchi subprovince, Superior Province, Canada: back-arc development on the margins of an Archean protocontinent Available to Purchase

Pete Hollings, Greg Stott, Derek Wyman
Published: 13 July 2000
Canadian Journal of Earth Sciences (2000) 37 (7): 1021–1038.
DOI: https://doi.org/10.1139/e00-007
... and pyroclastic breccia, displaying enriched LREE (La/Sm n = 3.7–7.2) and moderately fractionated HREE, in conjunction with pronounced negative Nb anomalies. Five distinct suites have been recognized in the ∼2740 Ma Confederation assemblage: (1) tholeiitic basalt with flat to smoothly depleted REE, (2) tholeiite...
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View PDF for article title, Trace element geochemistry of the Meen– Dempster greenstone belt, Uchi subprovince, Superior Province, Canada: back-arc development on the margins of an Archean protocontinent
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Comparison of assemblage subdivisions of the Pickle Lake greenstone belt from previous studies and this study, showing overall younging directions of each assemblage. The Northern Pickle assemblage of Stott (1996) is not recognized in this study as lithologic, and geochemical units are continuous across the previously inferred fault boundary with the Pickle Crow assemblage. New U–Pb zircon ages show that rocks previously inferred to be part of the Pickle Crow assemblage are age-correlative with the Confederation assemblage. Opposite younging directions, Nd isotopic results, and whole-rock geochemistry suggest that the Confederation assemblage rests unconformably on the Pickle Crow assemblage. The Kaminiskag assemblage (renamed from the Woman assemblage) is a thin package of juvenile volcanic rocks and occurs outboard of the Confederation assemblage suggesting tectonic juxtaposition. NP, Northern Pickle; PC, Pickle Crow; W, Woman (equivalent to K, Kaminiskag); C, Confederation.

Comparison of assemblage subdivisions of the Pickle Lake greenstone belt fr... Available to Purchase

Published: 13 September 2006
are continuous across the previously inferred fault boundary with the Pickle Crow assemblage. New U–Pb zircon ages show that rocks previously inferred to be part of the Pickle Crow assemblage are age-correlative with the Confederation assemblage. Opposite younging directions, Nd isotopic results, and whole-rock
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Photographs of selected units and field relationships: (A) coarse-grained gabbro sill in the Pickle Crow assemblage near the Dona Lake mine site; (B) oxide-facies banded iron formation in the Pickle Crow assemblage near the Dona Lake mine site; (C) northwest younging silicified pillowed basalt (alkalic) in the upper sequence of the Pickle Crow assemblage (view to northeast); (D) well-preserved pillowed basalt in the Confederation assemblage east of the Dona Lake area showing southeast-younging (view to northeast); (E) dacitic pyroclastic tuff (PBA01-MDY-G06 with bomb to lapilli size felsic fragments in a mafic matrix, basal Confederation assemblage near the Pickle Crow mine area; (F) quartz-phyric monolithic lapilli dacite (PBA01-MDY-G08C), Confederation assemblage.

Photographs of selected units and field relationships: (A) coarse-grained g... Available to Purchase

Published: 13 September 2006
basalt (alkalic) in the upper sequence of the Pickle Crow assemblage (view to northeast); (D) well-preserved pillowed basalt in the Confederation assemblage east of the Dona Lake area showing southeast-younging (view to northeast); (E) dacitic pyroclastic tuff (PBA01-MDY-G06 with bomb to lapilli size
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Representative whole-rock geochemical data for the Balmer and Confederation... Available to Purchase

Published: 23 May 2024
Table 1. Representative whole-rock geochemical data for the Balmer and Confederation assemblages in the Laird Lake area.
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The Meen–Dempster greenstone belt showing individual tectonic assemblages. Note the general southward younging of the assemblages. The metasedimentary Billett assemblage unconformably overlies the Confederation assemblage. Stratigraphic sections A–B and C–D illustrated in Fig. 3.

The Meen–Dempster greenstone belt showing individual tectonic assemblages. ... Available to Purchase

Published: 13 July 2000
Fig. 2. The Meen–Dempster greenstone belt showing individual tectonic assemblages. Note the general southward younging of the assemblages. The metasedimentary Billett assemblage unconformably overlies the Confederation assemblage. Stratigraphic sections A–B and C–D illustrated in Fig.  3 .
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(A) ɛNd values as a function of crystallization ages showing Nd isotope data for the Confederation assemblage mafic and intermediate to felsic volcanic rocks and quartz–feldspar porphyritic crystal tuffs of the Laird Lake property. (B) Enlarged section of diagram (A) to better show overlapping data points. Additional ɛNd data for post-volcanic intrusions from the Laird Lake property are included; pre-D2 diorite and post-D2 quartz diorite. Red Lake greenstone belt data (McNeely and Heyson sequence) from Sanborn-Barrie et al. (2001) and Henry et al. (2000). DM: depleted mantle, CHUR: chondritic uniform reservoir, C-MV: Confederation mafic volcanic, C-IFV: Confederation intermediate to felsic volcanic, C-QFT: Confederation quartz–feldspar porphyritic crystal tuff.

(A) ɛ Nd values as a function of crystallization ages showing Nd isotope... Available to Purchase

Published: 23 May 2024
Fig. 14. (A) ɛ Nd values as a function of crystallization ages showing Nd isotope data for the Confederation assemblage mafic and intermediate to felsic volcanic rocks and quartz–feldspar porphyritic crystal tuffs of the Laird Lake property. (B) Enlarged section of diagram (A) to better show
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Chondrite and primitive mantle normalized trace element diagrams for samples from the Confederation assemblage. Lau Basin data from Pearce et al. (1995), East Lau Spreading Centre (ELSC) data from Ewart et al. (1994). Normalizing values from McDonough and Sun (1995).

Chondrite and primitive mantle normalized trace element diagrams for sample... Available to Purchase

Published: 13 July 2000
Fig. 7. Chondrite and primitive mantle normalized trace element diagrams for samples from the Confederation assemblage. Lau Basin data from Pearce et al. ( 1995 ), East Lau Spreading Centre (ELSC) data from Ewart et al. ( 1994 ). Normalizing values from McDonough and Sun ( 1995 ).
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Horizontal slices through the final 3-D velocity model at depths of (a) 100 m, (b) 300 m, (c) 500 m, and (d) 700 m. The contacts between the main geological units and the locations of major fault zones are shown. BA, Balmer assemblage; CA, Confederation assemblage; MS, metasedimentary rocks; GI, granitic intrusion; PLFZ, Pakwash Lake fault zone; SLFZ, Sydney Lake fault zone.

Horizontal slices through the final 3-D velocity model at depths of ( a ) 1... Available to Purchase

Published: 21 July 2006
Fig. 5. Horizontal slices through the final 3-D velocity model at depths of ( a ) 100 m, ( b ) 300 m, ( c ) 500 m, and ( d ) 700 m. The contacts between the main geological units and the locations of major fault zones are shown. BA, Balmer assemblage; CA, Confederation assemblage; MS
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Structural elements: (A) stereonet of D1 and D2 fabric elements; (B) northeast-trending S2 crenulation foliation in iron carbonate altered basalt in the lower Pickle Crow assemblage; (C) Type 2 fold interference in oxide-facies iron formation outcropping in the Pickle Crow mine area (see Fig. 6 for location); (D) steeply south-dipping crenulation (S3) of north-trending S2 in intermediate volcanic rocks of the Confederation assemblage.

Structural elements: (A) stereonet of D 1 and D 2 fabric elements; (B) no... Available to Purchase

Published: 13 September 2006
area (see Fig.  6 for location); (D) steeply south-dipping crenulation (S 3 ) of north-trending S 2 in intermediate volcanic rocks of the Confederation assemblage.
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Plots of Ni and La/Smn versus Nb (A and B) and Nb/Nb* versus La/Ybn mafic volcanic rocks of the Kaminiskag and Confederation assemblages. Confederation SIT are subduction influenced tholeiite. Ontong Java plateau (OJP) data from Mahoney et al. (1993), Broken Ridge plateau data from Mahoney et al. (1995), Kerguelen data from Storey et al. (1992), North Caribou greenstone belt (NCGB) data from Hollings and Kerrich (1999). Lau Basin back arc basalts (BAB) from Pearce et al. (1995), siliceous high-magnesium basalt (SHMB) from Sun et al. (1989) and Hollings and Kerrich (1999), Okinawa BAB from Shinjo (1998), Archean plateaux data from Kerrich et al. (1999).

Plots of Ni and La/Sm n versus Nb (A and B) and Nb/Nb* versus La/Yb n maf... Available to Purchase

Published: 13 July 2000
Fig. 8. Plots of Ni and La/Sm n versus Nb (A and B) and Nb/Nb* versus La/Yb n mafic volcanic rocks of the Kaminiskag and Confederation assemblages. Confederation SIT are subduction influenced tholeiite. Ontong Java plateau (OJP) data from Mahoney et al. ( 1993 ), Broken Ridge plateau data from
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εNd values as a function of crystallization ages showing the Nd compositions of the samples from the Pickle Lake belt. The εNd and Nd model ages (intersection of dashed lines with DM line) of the Confederation assemblage volcanic rocks can be interpreted as reflecting Neoarchean recycling of juvenile Pickle Crow assemblage crust. Labels for intrusive samples as follows: PCp, Pickle Crow porphyry; Qtg, Quarrier tonalite gneiss; OCp, Ochig Lake pluton; PLs, Pickle Lake stock; SLp, Second Loon pluton. DM, depleted mantle evolution curve; CHUR, Chondritic Uniform Reservoir.

ε Nd values as a function of crystallization ages showing the Nd compositi... Available to Purchase

Published: 13 September 2006
Fig. 9. ε Nd values as a function of crystallization ages showing the Nd compositions of the samples from the Pickle Lake belt. The ε Nd and Nd model ages (intersection of dashed lines with DM line) of the Confederation assemblage volcanic rocks can be interpreted as reflecting Neoarchean
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Tectono-stratigraphic columns illustrating possible regional correlations among Mesoarchean and Neoarchean units and events in the Lake Winnipeg – Red Lake area. Lake Winnipeg: LS, Lewis–Storey; Bi, Black Island; Hr, Hole River; Rice Lake belt: Bd, Bidou; Ge, Gem; Wallace lake belt: Cl, Conley; OB, Overload Bay; BI, Big Island; Garner Lake: GLI, Garner Lake intrusion; Red Lake belt: Bm, Balmer; Ba, Ball; SB, Slate Bay; BC, Bruce Channel; TB, Trout Bay; Cf, Confederation assemblage.

Tectono-stratigraphic columns illustrating possible regional correlations a... Available to Purchase

Published: 31 August 2005
, Conley; OB, Overload Bay; BI, Big Island; Garner Lake: GLI, Garner Lake intrusion; Red Lake belt: Bm, Balmer; Ba, Ball; SB, Slate Bay; BC, Bruce Channel; TB, Trout Bay; Cf, Confederation assemblage.
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(A) V/Ti and (B) Sc/Y against Zr (ppm), and (C) Ti/Zr and (D) La/Ybn against Y (ppm) plots for the Laird Lake Confederation assemblage volcanic rocks. Filled shapes represent the arc volcanic rocks, and the open shapes represent the back-arc volcanic rocks. The mafic volcanic rocks are subdivided according to Ti/Zr versus Y trends. Plots A and B show elevated V/Ti and Sc/Y ratios for the arc rocks, which support the subdivision of the arc and back-arc volcanic rocks (Woodhead et al. 1993). Plot C shows a steep positive trend in Ti/Zr ratios for the mafic arc rocks, with flatter trend for the mafic back-arc rocks. Plot D shows that all arc rocks have more enriched LREE and fractionated HREE.

(A) V/Ti and (B) Sc/Y against Zr (ppm), and (C) Ti/Zr and (D) La/Yb n ag... Available to Purchase

Published: 23 May 2024
Fig. 16. (A) V/Ti and (B) Sc/Y against Zr (ppm), and (C) Ti/Zr and (D) La/Yb n against Y (ppm) plots for the Laird Lake Confederation assemblage volcanic rocks. Filled shapes represent the arc volcanic rocks, and the open shapes represent the back-arc volcanic rocks. The mafic volcanic rocks
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Primitive mantle-normalized diagrams for (A) Balmer ultramafic volcanic and intrusive rocks, (B) Balmer high-Ti mafic volcanic rocks, (C) Balmer low-Ti mafic volcanic rocks, (D) Confederation mafic volcanic rocks, (E) Confederation intermediate to felsic volcanic rock and syn-volcanic dioritic intrusion, and (F) Confederation quartz–feldspar crystal tuff. Normalizing values from Sun and McDonough (1989). Balmer diagrams include Red Lake geochemical compilation from Lemkow et al. (2006) for the western Uchi domain. The shaded fields represent the compilation of ultramafic and mafic volcanic rocks for the Balmer assemblage of the Red Lake greenstone belt. To create these fields, all samples that showed anomalous trends were excluded if they were described as altered or if no description was available.

Primitive mantle-normalized diagrams for (A) Balmer ultramafic volcanic and... Available to Purchase

Published: 23 May 2024
Fig. 4. Primitive mantle-normalized diagrams for (A) Balmer ultramafic volcanic and intrusive rocks, (B) Balmer high-Ti mafic volcanic rocks, (C) Balmer low-Ti mafic volcanic rocks, (D) Confederation mafic volcanic rocks, (E) Confederation intermediate to felsic volcanic rock and syn-volcanic
Journal Article

Gold prospectivity maps of the Red Lake greenstone belt: application of GIS technology, Available to Purchase

J.R. Harris, M. Sanborn-Barrie, D.A. Panagapko, T. Skulski, J.R Parker
Published: 04 September 2006
Canadian Journal of Earth Sciences (2006) 43 (7): 865–893.
DOI: https://doi.org/10.1139/e06-020
... ferroan-dolomite carbonatization and intense potassic alteration (sericite, muscovite) also affects primarily mafic and ultramafic volcanic rocks, and to a lesser degree affects intrusive rocks in the Balmer, Ball, and Confederation assemblages. Corresponding author (e-mail: [email protected]...
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View PDF for article title, Gold prospectivity maps of the Red Lake greenstone belt: application of GIS technology,
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Schematic cross sections representing the tectonic evolution of the southern margin of the North caribou terrane between ca. 2735 and 2700 Ma. (a) Arc compression or accretion of an unidentified terrane produces ca. 2735 Ma D1 deformation in the Confederation and older assemblages; (b) initiation of a new subduction zone results in formation of the short-lived Bidou island-arc (2733–2729 Ma); (c) back-arc spreading and subsequent arc magmatism produce the Black Island, Gem, and Anderson juvenile sequences (2724–2715 Ma); (d) collision and subduction of an oceanic terrane between 2718 and 2712 Ma produces D2 structures in the Red Lake – Confederation segment of the southern North Caribou margin; (e) consumption of northern oceanic lithosphere juxtaposes the Black Island – Bidou terrane with the continental margin (ca. 2700 Ma); (f) subduction of remaining southern oceanic tract traps the English River basin, which is buried, deformed, and metamorphosed as the North Caribou terrane over-rides Winnipeg River continental lithosphere during collisional orogeny.

Schematic cross sections representing the tectonic evolution of the souther... Available to Purchase

Published: 31 August 2005
Fig. 17. Schematic cross sections representing the tectonic evolution of the southern margin of the North caribou terrane between ca. 2735 and 2700 Ma. ( a ) Arc compression or accretion of an unidentified terrane produces ca. 2735 Ma D 1 deformation in the Confederation and older assemblages