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Record W2029491493 · doi:10.4138/atlgeol.2012.006

Precise age and petrology of Silurian-Devonian plutons in the Benjamin River – Charlo area, northern New Brunswick

2012· article· en· W2029491493 on OpenAlex
Jean-Luc Pilote, Sandra M. Barr, R. A. Wilson, Seán McClenaghan, Sandra L. Kamo, V J McNicoll, Mary Lou Bevier

Why this work is in the frame

A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.

affAt least one author lists a Canadian institution in the pinned OpenAlex snapshot.
venuePublished in a venue whose home country is Canada.
aboutThe title or abstract carries a Canadian signal from the geographic lexicon.

Bibliographic record

VenueAtlantic Geology · 2012
Typearticle
Languageen
FieldEarth and Planetary Sciences
TopicGeological and Geochemical Analysis
Canadian institutionsGeological Survey of CanadaUniversity of TorontoAcadia UniversityUniversity of British ColumbiaMemorial University of Newfoundland
Fundersnot available
KeywordsPlutonGeologyDioriteQuartz monzoniteGeochemistryZirconGabbroRhyoliteQuartzDaciteIgneous rockPetrologyPlagioclaseVolcanic rockPaleontologyVolcano

Abstract

fetched live from OpenAlex

The Late Silurian Landry Brook and Dickie Brook plutons and Charlo plutonic suite underlie a combined area of approximately 80 km2 in the northeastern part of the Ganderian Tobique-Chaleur tectonostratigraphic belt in northern New Brunswick. The Landry Brook pluton is divided into three units: gabbro to quartz diorite, quartz monzodiorite to monzogranite, and monzogranite. A sample from the quartz monzodiorite unit yielded a U-Pb (zircon) crystallization age of 419.63 ± 0.23 Ma. A granodioritic stock located near the Landry Brook pluton has yielded an age of 400.7 ± 0.4 Ma, indicating that it is a younger unrelated body, herein referred to as the Blue Mountain Granodiorite (new name). The Dickie Brook pluton also consists of three units: leucogabbro to quartz gabbro, diorite to quartz diorite and quartz monzodiorite to monzogranite. Two samples from the monzogranite unit yielded U-Pb (zircon) crystallization ages of 418 ± 1 Ma and 418.1 ± 1.3 Ma. The Charlo plutonic suite is a group of small plutons and dykes, located west of the Dickie Brook and Landry Brook plutons and consists mainly of diabase, quartz monzonite to monzogranite, rhyolite porphyry, and dacite porphyry. Chemical trends indicate that the quartz monzodiorite to monzogranite unit of the Landry Brook pluton, all of the units of the Dickie Brook pluton, and the quartz monzodiorite to monzogranite unit of the Charlo plutonic suite, as well as the volcanic host rocks of the Bryant Point and Benjamin formations, are co-magmatic. They formed following slab break-off and extension in the waning stages of the Salinic orogeny, which resulted from the collision of Ganderia and Laurentia. In contrast, the dacite porphyry of the Charlo plutonic suite may be cogenetic with the younger Blue Mountain Granodiorite and related to the collision of Avalonia with Laurentia.RÉSUMÉLes plutons des ruisseaux Landry et Dickie et le cortège plutonique de Charlo, du Silurien tardif, recouvrent une superficie totale d’environ 80 km 2 dans la partie nord-est du domaine tectonostratigraphique gandérien Tobique-Chaleur, dans le nord du Nouveau-Brunswick. Le pluton du ruisseau Landry se compose de trois unités : du gabbro à de la diorite quartzique, de la monzodiorite quartzique au monzogranite, et du monzogranite. Un échantillon de l’unité de monzodiorite quartzique a produit un âge de cristallisation de 419,63 ± 0,23 Ma par la méthode de datation U-Pb (sur zircon). Un bloc de granodiorite à proximité du pluton du ruisseau Landry a produit un âge de 400,7 ± 0,4 Ma, ce qui indiquerait qu’il s’agit d’un corps de formation plus récente et non relié, désigné ici comme la granodiorite de Blue Mountain (nouveau nom). Le pluton du ruisseau Dickie comprend lui aussi trois unités : du leucogabbro à du gabbro quartzique, de la diorite à de la diorite quartzique, et de la monzodiorite quartzique à du monzogranite. Deux échantillons de monzogranite ont produit des âges de cristallisation de 418 ± 1 Ma et de 418,1 ± 1,3 Ma, selon la méthode de datation U-Pb (sur zircon). Le cortège plutonique de Charlo est un groupe de plutons et de dykes de petite taille, situé à l’ouest des plutons du ruisseau Dickie et du ruisseau Landry, et il se compose de diabase, de monzonite quartzique à du monzogranite, de porphyre rhyolitique, et de porphyre dacitique. Les tendances chimiques indiquent une nature comagmatique en ce qui concerne l’unité de monzodiorite quartzique au monzogranite du pluton du ruisseau Landry, la totalité des unités du pluton du ruisseau Dickie, ainsi que l’unité monzodiorite quartzique au monzogranite du cortège plutonique de Charlo, tout comme pour les roches volcaniques encaissantes des Formations Bryant Point et Benjamin. Ces structures sont apparues après la rupture de la plaque et son extension aux derniers stades de l’orogenèse salinique, provoquée par la collision des anciens continents de Gandérie et de Laurentie. Par contraste, le porphyre dacitique du cortège plutonique de Charlo peut s’être formé sous les mêmes conditions que celles ayant présidé à l’apparition de la granodiorite plus récente de Blue Mountain et être associé à la collision des anciens continents d’Avalon et de Laurentie.[Traduit par la redaction]

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

Full frame distilled prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: codex-gemma-dda1882f352aValidation status: machine_predicted_unvalidated
Candidate categoriesInsufficient payload (model declined to judge)
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: Observational
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.133
Threshold uncertainty score0.997

Codex and Gemma teacher scores by category

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0040.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.013
GPT teacher head0.192
Teacher spread0.179 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it