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HAL Id: tel-00777975 https://tel.archives-ouvertes.fr/tel-00777975 Submitted on 18 Jan 2013 HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Etude pétrologique, structurale et géochronologique des formations cristallines du quart nord est de la feuille SAINT-GABRIEL-de-BRANDON ( Province de Grenville; Bouclier Canadien) Normand Goulet To cite this version: Normand Goulet. Etude pétrologique, structurale et géochronologique des formations cristallines du quart nord est de la feuille SAINT-GABRIEL-de-BRANDON ( Province de Grenville; Bouclier Canadien). Pétrographie. Universite Scientifique et Médicale de Grenoble, 1971. Français. tel- 00777975
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Page 1: Etude pétrologique, structurale et géochronologique des ... · rigid mole (apart from sorne rather small "blades" of mangerites, wich were folded together with the country rock).

HAL Id: tel-00777975https://tel.archives-ouvertes.fr/tel-00777975

Submitted on 18 Jan 2013

HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, estdestinée au dépôt et à la diffusion de documentsscientifiques de niveau recherche, publiés ou non,émanant des établissements d’enseignement et derecherche français ou étrangers, des laboratoirespublics ou privés.

Etude pétrologique, structurale et géochronologique desformations cristallines du quart nord est de la feuille

SAINT-GABRIEL-de-BRANDON ( Province deGrenville; Bouclier Canadien)

Normand Goulet

To cite this version:Normand Goulet. Etude pétrologique, structurale et géochronologique des formations cristallinesdu quart nord est de la feuille SAINT-GABRIEL-de-BRANDON ( Province de Grenville; BouclierCanadien). Pétrographie. Universite Scientifique et Médicale de Grenoble, 1971. Français. �tel-00777975�

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Doctorat de 3e Cycle N°d '0 rd re

THÈSE 0/' ~7 rJ-'? ~"'~ .

PRÉSENTÉE -?' /' ? 11

À L' UNivERSiTÉ SCiEN~ iFr~ U E d'/Çl"~fi ET MÉDicALE DE GRENOBLE (' 1

POUR OBTENIR lE TITRE DE

DOCTEUR DE 3ème CYCLE

SPÉCiAliTÉ: SCIENCES DE lA TERRE

. , MENTioN: GEOLOGIE APPLIQUEE

PAR

Normand GOUt ET

Etude pétrologique, structurale et géochronologique

des formations cristallines

du quart nord~est de la feuille SAINT-GABRIEl-de-BRANDON ( Province de Grenville; Bouclier Canadien)

Soutenue le 18 juin 1971 devant la Commission d'Examen

MM. R. MICHEL ... -..... _._ ... _ ... _. Président

P. G 1 R. AU D _._. _ ..... _._ ... _ .. _. Rapporte ur

M . CHE N E V 0 Y .. _. _ ... _' .' _. Invités

Y. V 1 ALE TT E _. _. _. _. _. _

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RESUME

La région de Saint-Gabriel-de-Brandon se situe à une centaine de ki­lomètres au NE de Montréal. Le secteur étudié couvre une superficie approxima­tive de 125 km2 . Il comprend trois unités de roches cristallines précambriennes: un complexe migmatitique qui constituerait le socle de la région, une série para­gneissique "de couverture", proche du Groupe de Grenville mais où les calcaires cristallins sont peu importants et enfin diverses roches plutoniques.

C es trois unités s'individualisent aussi bien du point de vue pétrogra­phique que structural. Tout d'abord le complexe de base est composé de migma­tites rubanées, (alternance de niveaux quartzo-feldspathiques et amphiboliques d'origine grauwackeuse) et de migmatites hétérogènes. A l'exception des amas et filons granitiques de ces derriières, les paragenèses sont celles du facies granu­lite. A l'intérieur de la "série paragneissique" qui se compose de gneiss alumi­neux, de gneiss à pyroxène, de quartzites, de roches calco-silicatées, de skarns et qui sont d'origine sédimentaire, sont interstratifiées, des leptites rubanées et des amphibolites d'origine éruptive ainsi que des gneiss à biotite et amphibole dérivant de formations volcano-détritiques.

Les paragenèses de ces para et orthogneiss sont celles soit du facies amphibolite- almandin le plus élevé, soit du facies granulite. Leur apparition s'est faite à une température minimale de 670°C à une pression solide comprise entre 6 et 10 kb, la pression d'eau étant nettement inférieure à PS'

Le granite adamellitique de Saint-Didace ainsi que les mangérites quartziques ortho-gneissifiées sont les types principaux des roches plutoniques qui sont en gros concordantes aux formations paragneissiques.

L'étude structurale de la région a révélé la superposition de deux phases majeures de plissement. La première a produit des plis isoclinaux, d'or­dre kilométrique, déversés vers le N ou le NO avec des axes orientés soit E-O, soit NE - SO. Les mangérites et s ans doute le granite de Saint-Didace seraient à peu près synchrones de cette première phase. Au cours de celle-ci la série paragneissique se serait déversée vers le NO sur le complexe migmatitique qui aurait joué le rôle de socle.

La deuxième phase, dont les plis sont axés entre NO - SE et N -S, a donné par superposition à la première, des figures d'interférence très complexes. Elle a affecté les trois ens embles mais les mas ses plutoniques ont agi comme des môles rigides à l' exc eption des "lames" r~lativement peu volumineus es de mangérites qui ont réagi aux efforts tectoniques comme leur encaissant.

L'étude géochronologique effectuée sur ces ensembles tend à prouver la superposition de plusieurs orogenèses. L'orogenèse Grenvillh:nI1e (950 MA) a

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été obtenue sur le "mobilis at" du complexe migmatitique. Le granite de Saint­Didace a sans doute été rajeuni à 1 105 MA. La série paragneissique aurait pour sa part été rajeunie durant l'orogenèse elsonienne (soit à 1 450 MA), tandis que la "restite" du complexe migmatitique de base donne un âge correspondant à l'orogenèse kénoranienne (2 300 MA).

ABSTRACT

The Saint-Gabriel-de- Brandon area is located about 60 miles NE of Montreal. The area studied covers about 50 sg. mi. It includes the following th,oee division of Precambrian rocks:

1 / A migmatitic complex which constitutJ:, s the basement of the area. 2 / A group of supracrustal rocks close to the Grenville Group but

with little crystalline limestones. 3 / Several kinds of plutonic rocks.

These thre e "units !! can be clearly distinguished by petrographie and structural studies. First the basement complex consist of banded migmatites (alternating quartzo-feldspathic and amphibolite bands of greywacky origin), and sorne heterogeneous migmatites. Disregarding a few masses and dykes of granite, the parageneses belong to the granulite facies. Bandes leptites and amphibolites of eruptive origin as weB as sorne biotite-amphibole gneisses of volcano-detritic origin, are interstratified into the "paragneisses series!!, itself composed of aluminous gneisses, of pyroxene gneisses, of quartzites , calc-silicated rocks, and of s karns, all of s edimen tary origin.

The parageneses of those para and orthogneisses belong either to the highest amphibolite facies, or to the granulite facies. They appear at a mini­mum temperature of 670°C and at a Ps comprised between 6 and 10 kb, with

PH20 less than Ps.

The Saint-Didace adamellitic pluton together with the orthogneissi­fied quartz-mangerites make Ut, t the main plutonics rocks types. They are roughly concordant to the paragneissic formations.

Structural study of the area reveals superposition of two major folding phases. The first phase gives rise to isoclinal folds of kilometric size, recumbent to the N or NW, with axes oriented either E-W or NE-SW. Mangerites and most likely the Saint-Didace granite, both appear to be about contemporaneous of this first phase. It was probably at this time that the paragn eisses series were overthrust to the NW over the migmatitic complex which acted a s ~L bas ement.

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The second phase features NW -SE to NS trending folds. Being

superposed over the first phase, it yieided highly complex interference patterns. It acted upon all _of the three above mentioned units , but the plutons behaved as rigid mole (apart from sorne rather small "blades" of mangerites, wich were folded together with the country rock).

Geochronologicai study of those three units brings evidence of several superimposed orogeneses. The mobilized part of the migmatitic complex belongs to the Grenville orogenesis (950 M. Y.). The Saint-Didace granite was probably rehomogenised at 1 105 M. Y. The p"llM?,nci ss'Ïl i l series,may have be reset during the Eisonian orogenesis (1 450 M. Y.). The migmatitic basement complex "r estite" is of Kenorian orogenesis age (2 300 M. Y. ).

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