Pluton emplacement by sheeting and vertical ballooning in part of the southeast Coast Plutonic Complex, British Columbia
Bibliographic record
Abstract
Research Article| May 01, 2000 Pluton emplacement by sheeting and vertical ballooning in part of the southeast Coast Plutonic Complex, British Columbia E.H. Brown; E.H. Brown 1Department of Geology, Western Washington University, Bellingham, Washington 98225, USA Search for other works by this author on: GSW Google Scholar W.C. McClelland W.C. McClelland 2Department of Geology and Geological Engineering, University of Idaho, Moscow, Idaho 83844, USA Search for other works by this author on: GSW Google Scholar Author and Article Information E.H. Brown 1Department of Geology, Western Washington University, Bellingham, Washington 98225, USA W.C. McClelland 2Department of Geology and Geological Engineering, University of Idaho, Moscow, Idaho 83844, USA Publisher: Geological Society of America Received: 30 Oct 1998 Revision Received: 19 Jul 1999 Accepted: 27 Jul 1999 First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2000) 112 (5): 708–719. https://doi.org/10.1130/0016-7606(2000)112<708:PEBSAV>2.0.CO;2 Article history Received: 30 Oct 1998 Revision Received: 19 Jul 1999 Accepted: 27 Jul 1999 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation E.H. Brown, W.C. McClelland; Pluton emplacement by sheeting and vertical ballooning in part of the southeast Coast Plutonic Complex, British Columbia. GSA Bulletin 2000;; 112 (5): 708–719. doi: https://doi.org/10.1130/0016-7606(2000)112<708:PEBSAV>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Batholiths of the Coast Plutonic Complex, in the area of Harrison Lake, British Columbia, are interpreted to have formed by horizontal sheeting and vertical inflation. Zoned ovoid batholiths exhibit sheeted margins as thick as 3 km. Shallow floors are indicated by moderately to gently inward dipping magmatic foliations, the observed trace of floor contacts across topography, and a published deep seismic reflection transect. Mineralogic aureoles under the floors preserve a paragenetic record of increasing pressure during aureole crystallization. Initial pressures of <3.0 kilobars are indicated by an early assemblage of andalusite + biotite. Garnet thermobarometry of late-stage aureole assemblages that overprint the andalusite indicates peak pressures of 5–6.5 kilobars, equating to an added load more than 7–12 km thick. The mode of emplacement of the ovoid batholiths is interpreted from these features to be a sequential process of (1) initial intrusion of a relatively shallow horizontal sheeted complex fed by a dike system, followed by (2) inflation vertically by multiple injections or ballooning of the original sheets to accommodate a high volume of magma. The floor of the initial sheets was pushed down and rotated into steeper dips at the pluton margins as the bottom sagged and the magma body assumed a bowl or tub shape. In this process, magma ascended via fractures, and space was made for the plutons primarily by downward displacement of country rock and concomitant depression of the Moho. U-Pb zircon dating reveals crystallization periods of as much as 8 m.y. for individual batholiths, a likely consequence of construction by episodic pulses of magma. This model finds accordance with observations of many workers in other orogenic belts. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.006 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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.
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".