The Origin of Adakites in the Garibaldi Volcanic Complex, Southwestern British Columbia, Canada
Bibliographic record
Abstract
The Garibaldi Volcanic Complex (GVC) is located in southwestern British Columbia, Canada. It comprises two volcanic fields: the Garibaldi Lake Volcanic Field (GLVF) in the north and the Mount Garibaldi Volcanic Field (MGVF) in the south. Petrographical and geochemical studies on volcanic rocks collected from the GVC have determined that they exhibit adakitic characteristics; these intermediate rocks range from basaltic andesite to dacite represented mainly by lava flows, domes and minor pyroclastic material. All the lavas exhibit evidence of magma mixing, which include sieve textured crystals, dehydration reaction textures, differently sized phenocryst populations, xenocrysts and xenoliths. The geochemistry of the GVC magmas exhibit several adakitic indicators which include high Sr/Y (> 40), Mg# (~ 51), Al2O3 (> 15 wt. %), low K2O/Na2O (~ 0.3), low Yb (< 1.9 ppm) and fractionated rare earth element (REE) compositions (La/Yb(N)~ 10), which have not been identified in previous studies. Adakites are the product of subducted slab partial melts within the garnet stability field, subdivided into low silica adakites (LSA; < 60 wt. % SiO2) and high silica adakites (HSA; > 60 wt. % SiO2) reflecting differing source regions, where HSA are primary slab melts and LSA are partial melts of mantle wedge peridotite that has been previously modified by slab-derived magmas. Identification of adakitic rocks in tectonic regimes unrelated to subduction have led to the argument that the distinctive high Sr/Y and La/Yb ratios are not unique and cannot be used as an indicator of slab partial melting. Basalts in adakite suites are often enriched in high field strength elements (HFSE; Nb in particular) and are classified as niobium enriched basalts (NEB); NEB is argued to originate from mantle wedge peridotite that has been previously metasomatised by slab partial melts. Trace element modelling illustrates that the GVC adakites can be generated by partial melting of subducted ocean crust. Incompatible and compatible element ratios and relative crustal thickness beneath the GVC preclude AFC processes or high pressure partial melting or crystallisation of basalt as the source of the adakite signature in the GVC rocks and suggests that the GVC adakites likely result from slab partial melts.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot 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.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".