Archaean orogenic ultrapotassic magmatism: an example from the southern Abitibi greenstone belt
Identifieur interne : 000467 ( France/Analysis ); précédent : 000466; suivant : 000468Archaean orogenic ultrapotassic magmatism: an example from the southern Abitibi greenstone belt
Auteurs : M. R. Laflèche [France] ; C. Dupuy [France] ; J. Dostal [Canada]Source :
- Precambrian Research [ 0301-9268 ] ; 1991.
Abstract
The Cléricy Pluton in the southern Abitibi greenstone belt of Québec is a syenitic intrusion cross-cut by nordmarkitic dykes. It is probably one of the oldest known ultrapotassic intrusions (about 2.7 Ga). It crystallized in a crustal environment under low PH20 < 2.5 kbar) and low fO2 conditions. Most trace elements behaved as compatible elements suggesting that sphene and apatite were involved together with clinopyroxene during low-pressure crystal fractionation. The large range of initial isotopic ratios (calculated for 2.68 Ga, ϵNd −1.9 to + 2.3), as well as the trace element distribution, suggest that the syenitic pluton is the product of differentiation from a parental magma with a composition similar to that of Timiskaming-type Archaean shoshonites contaminated by a crustal component. On the other hand, the nordmarkitic dykes are probably the result of crustal anatexis of metasedimentary rocks and some addition of the syenitic magma. The Cléricy peralkaline syenite differs chemically from typical intraplate syenites in being saturated with respect to quartz, and displaying lower Ti and HFSE contents. It is related to an ultrapotassic volcano-plutonic event, which characterized the last 20 Ma of igneous activity in the Abitibi greenstone belt. It may represent an increased rate of convergence of small heterogeneous plates during a subduction-driven accretion tectonic event which possibly marked the culmination of the Kenoran Orogeny in the Superior Province of the Canadian Shield.
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DOI: 10.1016/0301-9268(91)90014-2
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It is probably one of the oldest known ultrapotassic intrusions (about 2.7 Ga). It crystallized in a crustal environment under low PH20 < 2.5 kbar) and low fO2 conditions. Most trace elements behaved as compatible elements suggesting that sphene and apatite were involved together with clinopyroxene during low-pressure crystal fractionation. The large range of initial isotopic ratios (calculated for 2.68 Ga, ϵNd −1.9 to + 2.3), as well as the trace element distribution, suggest that the syenitic pluton is the product of differentiation from a parental magma with a composition similar to that of Timiskaming-type Archaean shoshonites contaminated by a crustal component. On the other hand, the nordmarkitic dykes are probably the result of crustal anatexis of metasedimentary rocks and some addition of the syenitic magma. The Cléricy peralkaline syenite differs chemically from typical intraplate syenites in being saturated with respect to quartz, and displaying lower Ti and HFSE contents. It is related to an ultrapotassic volcano-plutonic event, which characterized the last 20 Ma of igneous activity in the Abitibi greenstone belt. It may represent an increased rate of convergence of small heterogeneous plates during a subduction-driven accretion tectonic event which possibly marked the culmination of the Kenoran Orogeny in the Superior Province of the Canadian Shield.</div></front></TEI><affiliations><list><country><li>Canada</li><li>France</li></country><region><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li></region><settlement><li>Montpellier</li></settlement></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Lafleche, M R" sort="Lafleche, M R" uniqKey="Lafleche M" first="M. R." last="Laflèche">M. R. Laflèche</name></region><name sortKey="Dupuy, C" sort="Dupuy, C" uniqKey="Dupuy C" first="C." last="Dupuy">C. Dupuy</name></country><country name="Canada"><noRegion><name sortKey="Dostal, J" sort="Dostal, J" uniqKey="Dostal J" first="J." last="Dostal">J. Dostal</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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