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Nottaway Pluton
Stratigraphic label: [narc]ntw
Map symbol: nAntw

First published: 15 September 2017
Last modified:

 

Translation of original French

 

 

 

Informal subdivision(s)
Numbering does not necessarily reflect the stratigraphic position.
None
 
Author: Leclerc and Caron-Côté, 2017
Age: Precambrian / Archean / Neoarchean
Reference section:  
Type area: The Nottaway Pluton is located along the Nottaway Deformation Corridor (NTS sheets 32K01, 32K02 and 32K07). It is particularly well exposed on the shores of Poncheville Lake.
Geological province: Superior Province
Geological subdivision: Opatica Subprovince
Lithology: Biotite magnetite ± hornblende granite
Unit type: Lithodemic
Rank: Lithodeme
Status: Formal
Use: Active

 

 

Related unit(s)
  • None

 

 

 

 

Background

« Ultrametamorphic pink granites » associated with the Nottaway Shear Corridor were initially described in Sawyer and Benn (1993) and have been dated (U-Pb) by Davis et al. (1995). The southern contact of this intrusion was later defined during mapping work by Goutier and Leclerc-Cloutier (2006a and 2006b) using geophysical data. The work of Leclerc and Caron-Côté (2017) allowed to trace the contacts of the unit that were designated as the Nottaway Pluton in NTS sheets 32K01, 32K02, 32K07 and 32K08. The unit boundaries in NTS sheet 32K06 are still to be clarified.

 

Description

The Nottaway Pluton is essentially composed of medium to coarse-grained biotite magnetite (± hornblende) granite. The rock has a pinkish beige patina and commonly contains xenoliths of diorite, amphibolite and dioritic gneiss. This intrusion is characterized by heterogeneous deformation marked by rapid changes in structure; massive and homogeneous granite can thus be quickly replaced by a foliated or gneissic granite. In this gneiss, quartzofeldspathic leucocratic bands are commonly hematitized and show a light pink to dark color depending on the intensity of alteration. Melanocratic bands are rich in ferromagnesian minerals such as biotite, magnetite and, more locally, hornblende. In the NW-SE deformation zones of the Nottaway Shear Corridor, granite even develops a mylonitic structure characterized by asymmetric fabrics showing essentially dextral movement (Sawyer and Benn, 1993).

 

Thickness and distribution

The Nottaway Pluton is an NW-SE oriented intrusion and outcrops more than 75 km parallel to the Nottaway Shear Corridor route (NTS sheets 32K01, 32K02, 32K07, 32K08). The width of the intrusion reaches 15 km and it covers an area of approximately 1300 km2.

Dating

 Analysis of sample OP250, a granite showing well-developed C-S fabrics sampled in the Nottaway Shear Corridor, gave a crystallization age of 2686 ±4 My (TIMS, U-Pb on zircons; Davis et al., 1995).

Isotopic System Mineral Cristallization Age (My) (+) (-) Reference(s)
U-Pb Zircon 2686 4 4 Davis et al., 1995

Stratigraphic Relationship(s)

The Nottaway Pluton (2686 ±4 My, Davis et al., 1995) cuts diorites of the Ouescapis Pluton (2693 ±1 My, Davis et al., 1995).

Paleontology

Does not apply.

References

 

Author(s) Title Year of Publication Hyperlink (EXAMINE or Other)
DAVIS, W.J. – MACHADO, N. – GARIÉPY, C. – SAWYER, E.W. – BENN, K. U-Pb geochronology of the Opatica tonalite-gneiss belt and its relationship to the Abitibi greenstone belt, Superior Province, Quebec. Canadian Journal of Earth Sciences; volume 32, pages 113-127. 1995 Source
GOUTIER, J. – LECLERC-CLOUTIER, J.-F. Compilation géoscientifique – Géologie 1/50 000 – 32K02 – Lac Poncheville. Ministère des Ressources naturelles et de la Faune, Québec; CG SIGEOM 32K. Échelle 1/50 000. 2006a CG SIGEOM 32K
GOUTIER, J. – LECLERC-CLOUTIER, J.-F. Compilation géoscientifique – Géologie 1/50 000 – 32K01 – Lac Yapuouichi. Ministère des Ressources naturelles et de la Faune, Québec; CG SIGEOM 32K. Échelle 1/50 000. 2006b CG SIGEOM 32K
LECLERC, F. – CARON-CÔTÉ, E. Geological survey from the Opatica sub-province northeast of Matagami (Amisquioumisca Lake region). Ministère de l’Énergie et des Ressources naturelles, Québec. 2017 Bulletin géologiQUE
SAWYER, E.W. – BENN, K. Structure of the high-grade Opatica Belt and the adjacent low-grade Abitibi Subprovince, Canada : an Archean mountain front. Journal of Structural Geology; volume 15, pages 1443-1458. 1993 Source

 

 

 

 

27 février 2018