English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The lower Silurian Kingston complex of southern New Brunswick consists of metamorphosed sheeted bimodal dykes, exposed over a strike length of more than 100 km and a width of 3 to 8 km. The southwestern portion of the complex is bounded by major mylonite zones and the northeastern portion is bounded by brittle faults.  Mafic dykes consist of actinolite-plagioclase rocks with tholeiitic chemistry, typical of continental margin basalts. Salic dykes are rhyolitic or microgranitic, and have a chemistry typical of A2-type granitoids which are emplaced in post-collisional or post-subduction tensional environments. Despite the obvious extensional setting, the mafic dykes are chemically similar to older basalts in the Saint John region, which were emplaced in a subdue lion setting. Their chemistry apparently reflects the source of the melts (underplated lithosphere) rather than the tectonic setting.  The Kingston complex marks both the initiation and southeastern limit of major Siluro-Devonian magmatism in southern New Brunswick. Modelling suggests that emplacement of the complex took at least 2 to 3 million years during which heat input into the crust remained relatively low. Subsequent increase in the heat input during Silurian and Devonian time produced large-scale melting, pluton emplacement and metamorphism of the Kingston complex. Heating probably resulted from del am in at ion of the crust which allowed hot asthenosphere to impinge on the lower crust. The Kingston complex is a unique remnant indicating the origins and nature of magmatism along major transcurrent faults near the edge of the Avalon zone of the Appalachian orogen.  RESUME  Le complexe de Kingston du Silurien inferieur du sud du Nouveau-Brunswick consiste en un essaim de dykes bimodal metamorphise, expose sur une longueur de plus de 100 km et une largeur de 3 a 8 km. La partie sud-ouest du complexe est bordee par des zones de mylonite majeures et la partie nord-est est bordee de failles fragiles.  Les dykes mafiques consistent en roches a actinote-plagioclase de composition tholeiique, typiques des basaltes de marges continentales. Les dykes felsiques sont rhyolitiques ou microgranitiques et ont une composition typique des granitoides de type-A2 qui sont mis en place dans des environnements d'extension post-collisionnelle ou post-subduction. Malgre contexte extensionnel evident, les dykes mafiques sont chimiquement similaires aux basaltes plus anciens de la region de Saint-Jean, qui furent mis en place dans un environnement de subduction. Leur composition reflete apparemment la source des magmas (lithosphere epaissie par des intrusions a sa base) plutot que le contexte tectonique.  Le complexe de Kingston marque a la fois le debut et la limite sud-est du magmatisme Siluro-devonien majeur dans le sud du Nouveau-Brunswick. La modelisation suggere que l'emplacement du complexe prit au moins 2 a 3 millions d'annees durant lesquelles l'apport de chaleur dans la croute resta relativement bas. Des augmentations subsequentes dans l'apport de chaleur pendant le Silurien et le Devonien produisirent une fusion a grande echelle, l'emplacement de plutons et le metamorphisme du complexe de Kingston. La chauffe a probablement resulte de la delamination de la croute qui permit a l'asthenosphere chaude d'affecter la croute inferieure. Le complexe de Kingston est un vestige unique indiquant les origines et la nature du magmatisme le long des failles de decrochement majeures pres de la bordure de la zone d'Avalon de l'orogene appalachien.  [Traduit par la redaction]

Petrology and geochemistry of the Kingston complex - a bimodal sheeted dyke suite in southern New Brunswick