The Dugré Plutonic Suite was identified by Moukhsil et al. (2015) during mapping of the Parent region, Haut-Saint-Maurice.
Dugré Plutonic Suite 1 (pPdue1): Monzodiorite, Quartz Monzodiorite, Jotunite, Minor Amounts of Monzonite, Quartz Monzonite and Granite
Unit pPdue1, the least abundant of units, consists of monzodiorite, quartz monzodiorite, hypersthene monzodiorite (jotunite), and minor amounts of quartz monzonite and granite. Orthopyroxene is usually magmatic (also metamorphic), hence the Jotunite name. This unit contains boudins (tectonic enclaves) of the other two units (pPdue2 and pPdue3) and migmatitic paragneiss from the Wabash Complex. Monzodiorite and quartz monzodiorite are coarse grained, granoblastic and composed of plagioclase, biotite, hornblende, magnetite, trace K-feldspar and some sulphides. Under the microscope, plagioclase, quartz, orthopyroxene, clinopyroxene, hornblende, biotite, magnetite, garnet, trace K-feldspar, opaque minerals (pyrite and pyrrhotite) and some normative apatite are observed. Monzonite and granite are medium grained, leucocratic, magnetic and contain small amounts of biotite and amphibole.
Dugré Plutonic Suite 2 (pPdue2): Opdalite, Garnet-Magnetite Enderbite, Minor Amounts of Mangerite, Monzonite, Granite and Charnockite
Unit pPdu2 covers a significant area. It consists mainly of opdalite (orthopyroxene granodiorite), enderbite (orthopyroxene tonalite), and minor amounts of granite and mangerite. Granite is pinkish, medium grained, and intrudes as beds into the orthopyroxene-rich rocks (opdalite, enderbite, mangerite). Mangerite is greenish, medium grained and shows feldspar recrystallization. Opdalite and enderbite, usually green in fresh exposure, are affected by partial melting and show granitic to monzonitic mobilisate lenses. Granoblastic opdalite is composed of quartz, plagioclase, K-feldspar, orthopyroxene, green hornblende, magnetite and biotite. Accessory minerals are apatite, zircon and opaque minerals (pyrite). Enderbite is coarse grained, granoblastic and locally gneissic. It has the same mineral composition as opdalite, but is poorer in K-feldspar. Under the microscope, hornblende partially to completely replaces orthopyroxene, and myrmekite contains vermiculate quartz and plagioclase. Minor amounts of mangerite, monzonite, granite and charnockite from unit pPdu3 are present here and there in this unit.
Dugré Plutonic Suite 3 (pPdue3): Charnockite, Granite, Mangerite, Pinkish Granitic Pegmatite Dykes and/or Pockets
This unit consists of biotite-garnet-orthopyroxene-clinopyroxene charnockite, granite and mangerite. The rocks from unit pPdue2 and pinkish granitic pegmatite dykes and/or pockets were mapped in this unit.
Thickness and Distribution
The Dugré Plutonic Suite occupies a large part of the territory mapped in the Parent and Clova regions. Aeromagnetic maps allow to delimit it and establish its NE-SW orientation.
|Isotopic System||Mineral||Crystallization Age (Ma)||(+)||(-)||Metamorphic Age (Ma)||(+)||(-)||Reférence(s)|
|U-Pb||Zircon||1626||21||21||1096||4||4||Moukhsil et al. 2015|
|U-Pb||Zircon||1677||18||18||981||–||–||Moukhsil et al., 2015|
|U-Pb||Zircon||–||–||–||1088||–||–||Moukhsil et al., 2015|
|U-Pb||Zircon||–||–||–||1123||–||–||Moukhsil et al., 2015|
The Dugré Plutonic Suite is the bedrock of the Parent region. It is intruded by the Hibbard Plutonic Suite, the Roc Suite and the Bourguet Syenite. It also contains kilometric klippes of the Wabash Complex.
Does not apply.
|Author(s)||Title||Year of Publication||Hyperlink (EXAMINE or Other)|
|MOUKHSIL, F. – SOLGADI, F. – BELKACIM, S. – AUGLAND, L.E. – DAVID, J.||Géologie de la région de Parent, Haut-Saint-Maurice (Partie ouest du Grenville). Ministère de l’Énergie et des Ressources naturelles, Québec, 62 pages, 1 map.||2015||RG 2015-04|