Magma migration, folding, and disaggregation of migmatites in the Karakoram Shear Zone, Ladakh, NW India
Bibliographic record
Abstract
Research Article| July 01, 2008 Magma migration, folding, and disaggregation of migmatites in the Karakoram Shear Zone, Ladakh, NW India Roberto F. Weinberg; Roberto F. Weinberg † 1School of Geosciences, Monash University, Clayton, Vic 3800, Australia †E-mail: roberto.weinberg@sci.monash.edu.au Search for other works by this author on: GSW Google Scholar Geordie Mark Geordie Mark 1School of Geosciences, Monash University, Clayton, Vic 3800, Australia *Present address: Haywood Securities Inc., 2000, 400 Burrard St., Vancouver, British Columbia V6C 3A6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Roberto F. Weinberg † 1School of Geosciences, Monash University, Clayton, Vic 3800, Australia Geordie Mark *Present address: Haywood Securities Inc., 2000, 400 Burrard St., Vancouver, British Columbia V6C 3A6, Canada 1School of Geosciences, Monash University, Clayton, Vic 3800, Australia †E-mail: roberto.weinberg@sci.monash.edu.au Publisher: Geological Society of America Received: 15 Mar 2007 Revision Received: 20 Aug 2007 Accepted: 09 Oct 2007 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2008 Geological Society of America GSA Bulletin (2008) 120 (7-8): 994–1009. https://doi.org/10.1130/B26227.1 Article history Received: 15 Mar 2007 Revision Received: 20 Aug 2007 Accepted: 09 Oct 2007 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Roberto F. Weinberg, Geordie Mark; Magma migration, folding, and disaggregation of migmatites in the Karakoram Shear Zone, Ladakh, NW India. GSA Bulletin 2008;; 120 (7-8): 994–1009. doi: https://doi.org/10.1130/B26227.1 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 Efficient extraction of granitic magma from crustal sources requires the development of an extensive permeable network of melt-bearing channels during deformation. We investigate rocks that have undergone deformation and melting within the Karakoram Shear Zone of Ladakh, NW India, in which leucosome distribution is inferred to record the permeable network for magma extraction. Delicate structures preserved in these rocks record the development of this permeable magma network and its subsequent destruction to form a mobile mass of melt and solids, resulting from the interplay between folding and magma migration. During folding, magma migrated from rock pores into layer-parallel and axial-planar sheets, forming a stromatic migmatite or metatexite with two communicating sets of sheets, intersecting parallel to the fold axis. Once the network was developed, folding and stretching was eased by magma migration and slip along axial planar magma sheets. Folding and magma migration led to layer disaggregation, transposition, and the formation of a diatexite where rock coherency and banding were destroyed. A number of structures developed during this process such as cuspate fold hinges, disharmonic folds, truncated layering, shear along axial planar leucosomes, and flow drag and disruption of melanosomes. In this system, magma migration was an integral part of deformation and assisted the folding and stretching of metatexites, while folding gave rise to a magma sheet network, now preserved as leucosomes, as well as the pressure gradients that drove magma migration and the breakup of the metatexite. Thus, metatexite folding increased melt interconnectivity, while magma mobility increased strain rate and released differential stresses. 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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".