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Tasiuyak Gneiss

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Journal Article
Journal: Economic Geology
Published: 01 September 2002
Economic Geology (2002) 97 (6): 1307–1318.
... geological and geochemical studies have indicated that the Voisey’s Bay intrusion was contaminated by interaction with both sulfide-poor Archean gneisses and with Paleoproterozoic sulfide-bearing Tasiuyak metasedimentary gneiss. Limited sulfur isotope data previously indicated that only one of the four ore...
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F ig . 3. Histograms of δ 34 S values of the <b>Tasiuyak</b> <b>gneiss</b> (A) and massiv...
Published: 01 September 2002
F ig . 3. Histograms of δ 34 S values of the Tasiuyak gneiss (A) and massive and disseminated sulfide mineralization from various zones of the Voisey’s Bay intrusion (B). (Data from this study and Ripley et al., 1999 ).
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F ig . 4. δ 34 S values and S concentrations of the <b>Tasiuyak</b> <b>gneiss</b> in dril...
Published: 01 September 2002
F ig . 4. δ 34 S values and S concentrations of the Tasiuyak gneiss in drill core VB433 from the Reid Brook zone.
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F ig . 5. A. S-Se variations in the <b>Tasiuyak</b> <b>gneiss</b>. Open rectangles are ou...
Published: 01 September 2002
F ig . 5. A. S-Se variations in the Tasiuyak gneiss. Open rectangles are outcrop samples and filled rectangles are drill-core samples. B. The inset shows the complete data set with two additional samples with S concentrations in excess of 3 wt percent. The high-Se–low-S samples are primarily from
Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 703–724.
... of the Churchill province. The Nain-Churchill suture evolved between 1860 and 1740 Ma, impressing upon the Archean and Paleoproterozoic rocks a regional metamorphic and tectonic signature referred to as the Torngat orogen. An important component of the Torngat orogen is the Tasiuyak gneiss, a Paleoproterozoic...
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D 3  fabrics in the enderbitic and <b>Tasiuyak</b> <b>gneisses</b>. (A, B) S 1  fabric in...
Published: 01 May 2015
Fig. 9 D 3 fabrics in the enderbitic and Tasiuyak gneisses. (A, B) S 1 fabric in enderbitic gneiss overprinted by shallowly E- to ESE-dipping C 3 shear planes. In A, from Discovery Hill, the view faces south, and S 1 trends roughly SSW and dips steeply eastward (see pencil tip for scale
Journal Article
Journal: Economic Geology
Published: 01 May 2015
Economic Geology (2015) 110 (3): 691–711.
...Fig. 9 D 3 fabrics in the enderbitic and Tasiuyak gneisses. (A, B) S 1 fabric in enderbitic gneiss overprinted by shallowly E- to ESE-dipping C 3 shear planes. In A, from Discovery Hill, the view faces south, and S 1 trends roughly SSW and dips steeply eastward (see pencil tip for scale...
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Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 867–888.
... portions of the Voisey’s Bay intrusion suggest that these contaminated basaltic magmas underwent more extensive contamination in the upper crust when they encountered the sulfidic-graphitic Tasiuyak gneiss in magma conduits and/or in the Reid Brook subchamber. The fact that this secondary contamination...
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Journal Article
Journal: Economic Geology
Published: 01 September 2013
Economic Geology (2013) 108 (6): 1459–1469.
... has allowed for the identification of a bacterial sulfate reduction biosignature in the Tasiuyak gneiss in the footwall to the Voisey’s Bay deposit. This putative biosignature is preserved in the deposit even at high silicate magma/sulfide melt ratios (R-factor) and links the S present in the Voisey’s...
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Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 815–830.
.... In addition, we have analyzed potential contaminants: Archean Nain gneisses of various composition, and Paleoproterozoic enderbitic gneisses and Tasiuyak paragneisses. The analyses were performed on carefully handpicked plagioclase and apatite fractions in order to obtain more reliable isotopic data and check...
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Journal Article
Published: 15 October 2007
Canadian Journal of Earth Sciences (2007) 44 (10): 1413–1437.
...Tanya Tettelaar; Aphrodite Indares Abstract The Tasiuyak paragneiss at the western margin of the Nain Plutonic Suite has been subjected to two granulitefacies metamorphic events: ( i ) regional metamorphism during the Paleoproterozoic Torngat orogeny, and ( ii ) contact metamorphism due...
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Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 901–915.
... –12.4 ). In light of both isotopic and petrographic evidence for open-system behavior within the Voisey’s Bay magmatic system, a model of magma reduction involving assimilation of carbon-bearing country rock (i.e., the Tasiuyak gneiss) has been explored. Calculations suggest that the assimilation...
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Journal Article
Published: 03 April 2000
Canadian Journal of Earth Sciences (2000) 37 (4): 517–533.
... lamprophyre dykes. The chemical zonation of the micas and the presence of andradite suggest a complex sequence of crystallization. An Ar isotope correlation analysis indicates an age of approximately 550 Ma. The dykes have intruded the Tasiuyak gneiss, a suite of Paleoproterozoic metasedimentary rocks...
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Journal Article
Published: 01 July 1993
Canadian Journal of Earth Sciences (1993) 30 (7): 1470–1489.
... growth that correspond to distinct structural and metamorphic events have been recognized: (1) 1858 – 1853 Ma zircon and monazite dates are interpreted as the minimum age of stage I and peak metamorphic conditions; (2) 1844 Ma zircons from anatectic granitoids in the Tasiuyak gneiss complex (TGC...
Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 801–814.
... contact of the Eastern Deeps subchamber and within the conduit. The breccia is composed of abundant Tasiuyak paragneiss inclusions with a troctolitic-gabbroic matrix. The gneiss inclusions have reacted extensively with the enclosing magma. In general, the degree of reaction increases from the Reid Brook...
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Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 771–799.
... interbanded garnet-sillimanite and sulfide- and graphite-bearing paragneisses collectively known as "Tasiuyak gneiss," and minor massive to lineated enderbitic orthogneiss. The Nain province comprises interbanded quartzofeldspathic, amphibolitic, and gabbroic gneisses that exhibit retrogressed granulite...
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Journal Article
Journal: Economic Geology
Published: 01 June 2000
Economic Geology (2000) 95 (4): 831–844.
... of the interaction with country rocks that may have controlled the timing of sulfide liquid immiscibility. Geologic field relationships ( Ryan et al., 1995 ) suggested that sulfide may have been liberated from graphitic, sulfidic units in the Proterozoic Tasiuyak gneiss. The discovery of mineralized breccia units...
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Journal Article
Published: 01 August 2010
The Canadian Mineralogist (2010) 48 (4): 763–786.
... isotope ratios suggestive of involvement of the regional Tasiuyak paragneiss at depth. Oxygen isotope ratios of NPS granitoids are similar across the boundary between the Nain and Churchill provinces, which implies that anorthosites and granitoids in the NPS are not derived from the same materials...
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Journal Article
Published: 29 May 2002
Canadian Journal of Earth Sciences (2002) 39 (5): 611–623.
... exclusively Paleoproterozoic. The youngest concordant detrital zircon was subjected to four additional analyses; the weighted mean of the four most concordant analyses gives an age of 1916 ± 15 Ma (2σ). This suggests that primary deposition of this sample, and by extension the Tasiuyak gneiss, occurred...
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Journal Article
Published: 29 May 2002
Canadian Journal of Earth Sciences (2002) 39 (5): 625–637.
... all the way to Baffin Island are interpreted as the extensions of the Lac Lomier Complex and Tasiuyak Domain. The gravity data are presented as a colour image, draped over a shaded relief image of aeromagnetic data (Fig.  3 ). The shaded relief image is generated by calculating a normalized...
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