Deborah Formation
Stratigraphic label: [ppro]db
Map symbol: pPdb



Publication: 11 December 2020



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

Author(s): Girard, 1989
Age: Paleoproterozoic
Stratotype: None
Type area: Central part of the Rivière-Koksoak town
Geological province: Churchill Province
Geological subdivision: Rachel-Laporte Lithotectonic Domain
Lithology: Metagreywacke, shale, phyllite, schist, metaconglomerate, tectonic breccia, amphibolite, iron formation, metatuff and chert
Category: Lithostratigraphic
Rank: Formation
Status: Formal
Use: Abandoned
Replacement Unit(s)


The Deborah Formation was defined by Girard (1995) in sheet 23P05. It was extended into the NW corner of sheet 23P03 by Hammouche et al. (2011) and extrapolated northwards by Henrique-Pinto et al. (2017, 2019). The unit was abandoned by Lafrance and Vanier (2021) as part of the Southeastern Churchill Province synthesis (Lafrance et al., 2018).

Revised Units Abandonned Units Reference(s)
pPfru1b pPdeb2; Deborah Formation – S3T(M10) and S3T(M25) Hammouche et al., 2011; Girard, 1995
pPfru3b Deborah Formation – M14 Girard, 1995
pPfru4b Deborah Formation – S9E Girard, 1995
pPkle1a Deborah Formation – M16 Girard, 1995
pPkle1b Deborah Formation – V3(M16)[TU]pPkle3 Girard, 1995
pPkle3 Deborah Formation Girard, 1995

Reasons for Abandonment

Girard (1995) included a wide range of lithologies in the Deborah Formation, which was subsequently divided into several units in a subsequent compilation. In their synthesis, Lafrance and Vanier (2021) abandoned this unit and reassigned metasedimentary rocks to the Freneuse Suite, the majority of which correspond to unit pPfru1b. Amphibolite, metatuff and gabbro units of the Deborah Formation have been included in units pPkle1a, pPkle1b and pPkle3 of the Klein Suite, respectively.


Publications Available Through SIGÉOM Examine

GIRARD, R., 1995. Géologie de la région du lac Deborah, Territoire-du-Nouveau-Québec. MRN; MB 95-20, 186 pages et 3 plans.

HAMMOUCHE, H., LEGOUIX, C., GOUTIER, J., DION, C., PETRELLA, L. 2011. Géologie de la région du lac Bonaventure. MRNF; RG 2011-03, 37 pages et 1 plan.

LAFRANCE, I., CHARETTE, B., VANIER, M.-A., 2018. Sud-est de la Province de Churchill, Nunavik, Québec, Canada: synthèse de la géologie. MERN; BG 2018-12

LAFRANCE, I., VANIER, M.-A., 2021. Domaine lithotectonique de Rachel-Laporte, sud-est de la Province de Churchill, Nunavik, Québec, Canada: synthèse de la géologie. MERN; BG 2021-01, 2 plans.


Other Publications

HENRIQUE-PINTO, R., GUILMETTE, C., BILODEAU, C., McNICOLL, V., 2017. Evidence for transition from a continental forearc to a collisional pro-foreland basin in the eastern Trans-Hudson Orogen: Detrital zircon provenance analysis in the Labrador Trough, Canada. Precambrian Research, volume 296, pages 181-194.

HENRIQUE-PINTO, R., GUILMETTE, C., BILODEAU, C., STEVENSON, R., CARVALHO, B.B., 2019. Petrography, geochemistry, and Nd isotope systematics of metaconglomerates and matrix-rich metasedimentary rocks: implications for the provenance and tectonic setting of the Labrador Trough, Canada. Canadian Journal of Earth Sciences, volume 56, pages 672-687.


Suggested Citation

Ministère de l’Énergie et des Ressources naturelles (MERN). Deborah Formation (abandoned). Quebec Stratigraphic Lexicon. [accessed on Day Month Year].


First publication

Isabelle Lafrance, P. Geo., M.Sc. (redaction)

Mehdi A. Guemache, P. Geo., Ph.D. (coordination); Marc-Antoine Vanier, Jr. Eng., M.Sc. (critical review); Simon Auclair, P. Geo., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); André Tremblay (HTML editing).

18 janvier 2022