Preliminary Notes On the Geology of the St. Maurice Tectonic Zone, Grenville Orogen, Quebec

Nadeau, L; Corrigan, D

doi:10.4095/132650

Cited by 3 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AW and Corrigan 1991), provided direction for this thesis. During that first season, it was recognized that east-dipping amphibolite-facies supracrustal and metaplutonic rocks in which primary features are locally preserved, structurally overly sub-horizontal to moderately east-dipping granulite facies ortho-and paragneisses.…”

Section: Statement Of the Problemmentioning

confidence: 99%

“…1.3) is characterized by relatively lower grade assemblages, and a predominance of gneisses of undoubtable volcanic, volcaniclastic, and sedimentary origin. The supracrustal rocks (Montauban Group) are intruded by a suite of calc-alkaline plutons of predominantly dioritic composition (La Bostonnais Complex; Nadeau and Corrigan (1991), after Rondot (1986)).…”

Section: Portneuf-st Maurice Domainmentioning

confidence: 99%

“…The Montauban Group is intruded by a suite of dioritic, tonalitic, granodioritic, granitic, and minor gabbroic and ultramafic plutons (Nadeau and Corrigan 1991;Gauthier 1993). U-Pb zircon ages of ca.…”

Section: Ii) La Bostonnais Complexmentioning

confidence: 99%

“…However, recent geological mapping has not found true oceanic crust (i.e. ophiolites) in the region outlined by Rondot (Nadeau and Corrigan 1991), prompting a re-evaluation of his model.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this paper is to present a concise description of the lithological and structural characteristics of the Mauricie region, in order to discuss its tectonic setting and evolution, and to provide a better framework for evaluating its significance with respect to the Grenville orogen. The data presented here are based partly on reconnaissance geological mapping at 1:250,000 scale (Nadeau and Corrigan 1991), but primarily on 6 months of more detailed field work done by the author, concentrated in an east-west band across the Mauricie region, referred to in this paper as the "Mauricie transect" (Fig. 1.2).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mesoproterozoic evolution of the south-central Grenville orogen; structural, metamorphic, and geochronologic constraints from the Mauricie transect.

Corrigan¹

View full text Add to dashboard Cite

Bibliotheque nationale du Canada Direction des acquisitions et des services bibliographiques 395, rue Wellington Ottawa (Ontario) K1A0N4 Your file Votre reference Our file Notre reference The author has granted an irrevocable non-exclusive licence allowing the National Library of Canada to reproduce, loan, distribute or sell copies of his/her thesis by any means and in any form or format, making this thesis available to interested persons. L'auteur a accorde une licence irrevocable et non exclusive permettant a la Bibliotheque nationale du Canada de reproduire, prefer, distribuer ou vendre des copies de sa these de quelque maniere et sous quelque forme que ce soit pour mettre des exemplaires de cette these a la disposition des personnes interessees.

show abstract

Section: Statement Of the Problemmentioning

confidence: 99%

Section: Portneuf-st Maurice Domainmentioning

confidence: 99%

Section: Ii) La Bostonnais Complexmentioning

confidence: 99%

“…However, recent geological mapping has not found true oceanic crust (i.e. ophiolites) in the region outlined by Rondot (Nadeau and Corrigan 1991), prompting a re-evaluation of his model.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mesoproterozoic evolution of the south-central Grenville orogen; structural, metamorphic, and geochronologic constraints from the Mauricie transect.

Corrigan¹

View full text Add to dashboard Cite

show abstract

Origin of magmatic sulfides in a Proterozoic island arc—an example from the Portneuf–Mauricie Domain, Grenville Province, Canada

2010

View full text Add to dashboard Cite

⁴⁰Ar/³⁹Ar thermochronology along a western Québec transect of the Grenville Province, Canada

Martignole¹,

Reynolds²

1997

Journal Metamorphic Geology

View full text Add to dashboard Cite

A B S TR A CT40Ar/39Ar thermochronology on 24 hornblendes, 3 biotites, 2 muscovites and 2 K-feldspars, collected along a 400 km-long NW-SE geotraverse through the Grenville Province in western Québec, is employed to provide time constraints on the intermediate and low temperature stages of cooling of part of the Grenville orogen. In the Grenville Front zone, the c. 1000 Ma time of exhumation previously established from thermobarometric and isotopic studies, is supported by the hornblende age data presented here. From 60 km to 160 km SE of the Front, reworked Archaean migmatites of the parautochthonous Réservoir Dozois terrane (RDT; 1004 Ma-old metamorphic monazites) contain hornblendes with 972-950 Ma cooling ages. Assuming metamorphic geotherms between 25 and 30°C km−1, calculated cooling and unroofing rates are about 6°C Ma−1 and 0.33 km Ma−1 in the P-T range 725°C-800 MPa and 450°C-400 MPa. Hornblendes from monocyclic rocks of the Mont-Laurier and Morin terranes (MLT and MT; monazite ages c. 1165 Ma) give ages of about 1040 and 1010 Ma, respectively. Calculation of cooling-unroofing rates from peak metamorphic conditions in this area is hampered by thermal perturbations associated with the still poorly dated Grenville collision which took place approximately between 1060 and 1020 Ma. Cooling ages of c. 900 Ma for muscovite and biotite and 860-810 Ma for K-feldspar, show that cooling rates decreased to around 1.5°C Ma−1 under retrograde greenschist facies conditions in the MLT. On a time vs. distance diagram, the hornblende data define several distinct age ranges, suggesting that each terrane had a characteristic thermal history. Thus, cooling was diachronous and probably non-homogeneous throughout this segment of the Grenville orogen. The time-lag between the cooling history of the parautochthon (972-950 Ma) and the allochthons (1040-1010 Ma) is compatible with an earlier (pre-1040 Ma) peak of metamorphism in the allochthons. The Réservoir Cabonga allochthon was transported toward the NNW from its probable root zone in the MLT during the 1060-1020 Ma Grenvillian collision as a partially cooled slab. The remobilization of the Archaean parautochthon is attributed to this collision. In the Grenville Front zone, slightly older cooling ages and cooling rates initially faster than in the remaining part of the parautochthon are probably as a result of rapid (tectonic?) exhumation shortly after collision. The minor delay (20-30 Ma) in unroofing of the MT compared to the adjacent MLT is most likely related to post-1040 Ma extensional displacement along the Labelle shear zone. In terranes like those described above where metamorphism is diachronous, determination of cooling rates and the history of exhumation may be meaningless without a firm control on the regional structure. However, identification of contrasting cooling histories contributes to unravelling the independent movement of terranes.

show abstract

Preliminary Notes On the Geology of the St. Maurice Tectonic Zone, Grenville Orogen, Quebec

Cited by 3 publications

References 0 publications

Mesoproterozoic evolution of the south-central Grenville orogen; structural, metamorphic, and geochronologic constraints from the Mauricie transect.

Mesoproterozoic evolution of the south-central Grenville orogen; structural, metamorphic, and geochronologic constraints from the Mauricie transect.

Origin of magmatic sulfides in a Proterozoic island arc—an example from the Portneuf–Mauricie Domain, Grenville Province, Canada

⁴⁰Ar/³⁹Ar thermochronology along a western Québec transect of the Grenville Province, Canada

Contact Info

Product

Resources

About

Preliminary Notes On the Geology of the St. Maurice Tectonic Zone, Grenville Orogen, Quebec

Cited by 3 publications

References 0 publications

Mesoproterozoic evolution of the south-central Grenville orogen; structural, metamorphic, and geochronologic constraints from the Mauricie transect.

Mesoproterozoic evolution of the south-central Grenville orogen; structural, metamorphic, and geochronologic constraints from the Mauricie transect.

Origin of magmatic sulfides in a Proterozoic island arc—an example from the Portneuf–Mauricie Domain, Grenville Province, Canada

40Ar/39Ar thermochronology along a western Québec transect of the Grenville Province, Canada

Contact Info

Product

Resources

About

⁴⁰Ar/³⁹Ar thermochronology along a western Québec transect of the Grenville Province, Canada