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Alison Formation
Stratigraphic label: [ppro]als
Map symbol: pPals

 

ABANDONED UNIT

Publication: 19 March 2020

 

 

  DISCLAIMER: This English version is translated from the original French. In case of any discrepancy, the French version shall prevail. 

Author(s):Owens, 1952
Age:Paleoproterozoic
Stratotype:None
Type area:Alison Lake area (58°07’N, 70°13’W), SW of Ungava Bay (NTS sheet 24L01)
Geological province:Churchill Province
Geological subdivision:New Quebec Orogen (Labrador Trough) / Bérard Lithotectonic Zone
Lithology:Sedimentary rocks (quartzite)
Category:Lithostratigraphic
Rank:Formation
Status:Formal
Use:Abandoned
Replacement Unit(s)
 

Background

The name « Alison Quartzite » was first used by Owens (1952) in a statutory report. This rock unit is well exposed at Alison Lake, which is located ~105 km west of Kuujjuaq (sheet 24L01). Owens (1952) observed the unit at the western edge of the Labrador Trough, usually in contact with Archean granitic gneiss of the Superior Craton. Bérard (1965) mapped the Alison Quartzite along the entire length of his study area between latitudes 58°N and 59°N. In his table of formations, Bérard (1965) gave the Alison Quartzite the rank of a formation. He found that the unit lies at the base of the Proterozoic sequence, with the exception of three places where the « lower dolomite » occupies the base. The Alison Quartzite is almost entirely overlain by an iron formation, then known as the Fenimore Formation (Owens, 1952; Bérard, 1965). Although the same quartzite occurs north of latitude 59°N, it has not been referred to as the Alison Quartzite. South of latitude 58°N, the unit was named the Wishart Formation by Clark (1979), following the nomenclature adopted in more southerly areas. The name Alison Formation was abandoned by Clark and Wares (2004) as it is equivalent to the Wishart Formation.

Reasons for Abandonment

Bérard (1965) concluded that the Alison Quartzite is the stratigraphic equivalent of the Wishart Formation. This conclusion is supported by the fact that the Alison Quartzite, and the overlying Fenimore Formation, show similar stratigraphic relationships to those exhibited by the Wishart Formation and the Sokoman Formation in the southern Labrador Trough. Clark and Wares (2004) were also of the opinion that the Alison Quartzite and the Fenimore Formation are stratigraphic equivalents of the Wishart and Sokoman formations, respectively. Because of this equivalence and the fact that the Wishart name was used first (see Frarey and Duffell, 1964), the name Alison Formation was abandoned as recommended by Clark and Wares (2004).

References

Publications Available Through SIGÉOM Examine

BERARD, J. 1965. REGION DU LAC BERARD, NOUVEAU-QUEBEC. MRN. RG 111, 175 pages and 2 plans.

BERARD, J. 1965. BERARD LAKE AREA, NEW QUEBEC. MRN. RG 111(A), 148 pages and 2 plans.

CLARK, T. 1979. REGION DU LAC NAPIER (NOUVEAU-QUEBEC) – RAPPORT PRELIMINAIRE. MRN. DPV 663, 28 pages and 1 plan.

CLARK, T., WARES, R. 2004. SYNTHESE LITHOTECTONIQUE ET METALLOGENIQUE DE L’OROGENE DU NOUVEAU-QUEBEC (FOSSE DU LABRADOR). MRNFP. MM 2004-01, 182 pages and 1 plan.

OWENS, O E. 1952. GEOLOGICAL REPORT, CLAIM GROUPS 2 AND 3. FENIMORE IRON MINES LTD. Rapport statutaire soumis au gouvernement du Québec. GM 02135-B, 36 pages and 4 plans.

 

Other Publications

FRAREY, M.J., DUFFELL, S. 1964. Revised stratigraphic nomenclature for the central part of the Labrador Trough. Geological Survey of Canada; Paper 64-25, 13 pages.

 

Suggested Citation

Ministère de l’Énergie et des Ressources naturelles (MERN). Alison Formation (abandoned unit). Quebec Stratigraphic Lexicon. https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-de-churchill/formation-alison_en [accessed on Day Month Year].

Contributors

First publication

Thomas Clark, P. Geo., Ph.D. (redaction)

Mehdi A. Guemache, P. Geo., Ph.D. (coordination); Charles St-Hilaire, GIT, M.Sc. (critical review); Simon Auclair, P. Geo., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); Ricardo Escobar Moran (HTML editing).

 

 

12 octobre 2022