Variation in Major and Trace Elements of Primary WÖhlerite As an Indicator of the Origin of Pegmatites in the Larvik Plutonic Complex, Norway
Bibliographic record
Abstract
Research Article| October 23, 2018 Variation in Major and Trace Elements of Primary WÖhlerite As an Indicator of the Origin of Pegmatites in the Larvik Plutonic Complex, Norway Øyvind Sunde; Øyvind Sunde § Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway § Corresponding author e-mail address: oyvind.geologi@gmail.com Search for other works by this author on: GSW Google Scholar Henrik Friis; Henrik Friis Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway Search for other works by this author on: GSW Google Scholar Tom Andersen Tom Andersen Department of Geosciences, University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar The Canadian Mineralogist (2018) 56 (4): 529–542. https://doi.org/10.3749/canmin.1700050 Article history first online: 23 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Øyvind Sunde, Henrik Friis, Tom Andersen; Variation in Major and Trace Elements of Primary WÖhlerite As an Indicator of the Origin of Pegmatites in the Larvik Plutonic Complex, Norway. The Canadian Mineralogist 2018;; 56 (4): 529–542. doi: https://doi.org/10.3749/canmin.1700050 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyThe Canadian Mineralogist Search Advanced Search Abstract Wöhlerite is an abundant primary high field-strength element-bearing mineral in alkaline pegmatites occurring in the Permian Larvik Plutonic Complex in the Oslo Rift, Norway. Wöhlerite has a flexible crystal-chemical structure able to incorporate cations of different size and valence and is therefore a potential indicator mineral in mildly peralkaline systems. The major- and trace-element composition of wöhlerite from pegmatites across the complex has been studied as a potential geochemical proxy for the pegmatite-forming melt. The pegmatites are mainly confined to larvikite (i.e., hypersolvus monzonite) and nepheline syenite of the complex, but the genetic relationship between the pegmatites and their host rock is unclear. Pegmatites carrying primary wöhlerite were sampled from different sections of the complex to investigate whether or not compositional variations within the host larvikite were recorded in wöhlerite from the pegmatites. Rare-earth element distribution patterns of wöhlerite show that pegmatites associated with nepheline syenite are identical to pegmatites occurring in evolved larvikites, whereas wöhlerite from pegmatites situated in less-evolved larvikite shows different rare-earth element distributions. Variations in wöhlerite Fe/Mn atomic ratio agree with a model in which different intrusive members of the complex formed by emplacement of separate batches of larvikite magma. The relationship between Mn and Nb may also be explored as a means to discriminate between wöhlerite crystallized from different alkaline systems, e.g., nepheline syenitic or carbonatitic melts. You do not currently have access to this article.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot 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.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".