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Record W2167291234 · doi:10.2113/gscanmin.43.6.2049

CARBONATITES AND CARBONATITES AND CARBONATITES

2005· article· en· W2167291234 on OpenAlexafffundvenue
R.H. Mitchell

Bibliographic record

VenueThe Canadian Mineralogist · 2005
Typearticle
Languageen
FieldEarth and Planetary Sciences
TopicGeological and Geochemical Analysis
Canadian institutionsLakehead University
FundersNatural Sciences and Engineering Research Council of CanadaLakehead University
KeywordsCarbonatiteGeochemistryGeologyMantle (geology)

Abstract

fetched live from OpenAlex

Le clan des carbonatites est ici redefini dans le contexte d'une classification mineralogique et genetique, et subdivise en deux groupes: carbonatites primaires et residus carbothermaux. On souligne le fait que est a la fois un terme petrographique applicable a un type de roche particulier, et un terme faisant reference a un groupe de roches, et applique a des roches carbonatees and silicatees genetiquement liees dans un complexe magmatique ou extrusif. On peut diviser les carbonatites primaires, en termes de classifications mineralogiques et genetiques plutot que de simples classifications modales, en un groupe de carbonatites veritablement magmatiques formees a partir de divers magmas mantelliques, i.e., carbonatites associees aux clans de melilitite, nephelinite, aillikite et kimberlite, avec ces dernieres manifestations preferablement appelees kimberlites a calcite. Chaque type de magma et les carbonatites associees seraient genetiquement distincts, et formees a des profondeurs differentes du manteau superieur selon des taux distincts de fusion partielle. Les carbonatites associees aux suites de melilitite et de nephelinite peuvent avoir une multiplicite d'origines, impliquant possiblement fusion fractionnee, cristallisation fractionnee ou immiscibilite liquide. Les kimberlites a calcite seraient des differencies tardifs a volume limite qui ne sont pas apparentees aux autres carbonatites ou a leur magmas parents. L'origine et les relations genetiques de la natrocarbonatite de Oldoinyo Lengai ne peuvent pas etre precisees sans ambiguite, quoique ces roches sont considerees comme variete distincte de carbonatite primaire. Les roches riches en carbonates associees aux divers complexes hyperalcalins potassiques ou sodiques satures ou sous-satures et derives surtout a partir du manteau lithospherique ayant subi une metasomatose, de meme que les roches enrichies en carbonates de terres rares, d'origine indeterminee, seraient plutot des residus carbothermaux que des carbonatites. Il pourrait y avoir convergence mineralogique (ou modale) entre de telles roches et les produits veritables a faible pression de carbonatites primaires enrichis en terres rares. On ne devrait pas inclure les roches riches en carbonates formees par reactions pneumatolytiques ou par anatexie de roches de la croute dans le clan des carbonatites.

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.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.002
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.007
Threshold uncertainty score0.023

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0010.002
Meta-epidemiology (narrow)0.0010.000
Meta-epidemiology (broad)0.0010.001
Bibliometrics0.0030.004
Science and technology studies0.0020.005
Scholarly communication0.0040.003
Open science0.0010.002
Research integrity0.0030.002
Insufficient payload (model declined to judge)0.0070.001

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 head0.009
GPT teacher head0.172
Teacher spread0.163 · 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

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designObservational
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations436
Published2005
Admission routes3
Has abstractyes

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