Architecture and Evolution of the Crust during Continental Arc Magmatism: A Transect through the Coast Mountains Batholith, British Columbia
Bibliographic record
Abstract
ABSTRACT The Coast Mountains batholith (CMB) is one of the largest continental margin batholiths in the world. It is nearly continuously exposed for >1700 km along the west coast of North America in British Columbia through southeastern Alaska into southwestern Yukon Territory. This guide, prepared for the GSA Thompson Field Forum held in August 2018, describes the geology along the readily accessible Skeena River transect of the CMB in British Columbia. At this latitude, the CMB is bounded on the east by generally low-grade stratified rocks and subordinate Jurassic to Eocene plutons. These rocks are bounded on the west by a Paleogene, low-angle, top-to-the northeast detachment (the Eastside detachment). West of the detachment, the Central Gneiss Complex (CGC), which forms the lower plate of the detachment, consists of amphibolite to granulite-facies schist, gneiss, and orthogneiss, intruded by Late Cretaceous to Paleogene plutons. The CGC is characterized by regionally consistent Eocene 40Ar/39Ar and K-Ar cooling dates. This core belt is bounded on the west by the Paleogene Coast shear zone, a steep crustal-scale structure. Paleogene plutons do not occur west of this belt. West of the Coast shear zone, schists of the Western metamorphic belt show evidence for southwest-verging thrusting, and form an inverted metamorphic sequence with grade dramatically decreasing to the west. These rocks are intruded by Jurassic to Late Cretaceous plutons. We use this transect as a basis to examine the growth of the CMB as a whole, emphasizing commonalities and variations with the batholith and how these traits may reflect magmatic processes that create this and other convergent-margin batholiths. We conclude by highlighting a few of the many open questions regarding the evolution of this complex batholith.
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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) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.003 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".