Microstructures and microshears as proxy for strain in subglacial diamicts: Implications for basal till formation
Bibliographic record
Abstract
Research Article| October 01, 2006 Microstructures and microshears as proxy for strain in subglacial diamicts: Implications for basal till formation Nicolaj K. Larsen; Nicolaj K. Larsen 1Department of Earth Sciences, University of Aarhus, C.F. Møllers Allé 120, DK-8000 Århus, Denmark Search for other works by this author on: GSW Google Scholar Jan A. Piotrowski; Jan A. Piotrowski 1Department of Earth Sciences, University of Aarhus, C.F. Møllers Allé 120, DK-8000 Århus, Denmark Search for other works by this author on: GSW Google Scholar Frits Christiansen Frits Christiansen 1Department of Earth Sciences, University of Aarhus, C.F. Møllers Allé 120, DK-8000 Århus, Denmark Search for other works by this author on: GSW Google Scholar Geology (2006) 34 (10): 889–892. https://doi.org/10.1130/G22629.1 Article history received: 26 Jan 2006 rev-recd: 15 May 2006 accepted: 18 May 2006 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Nicolaj K. Larsen, Jan A. Piotrowski, Frits Christiansen; Microstructures and microshears as proxy for strain in subglacial diamicts: Implications for basal till formation. Geology 2006;; 34 (10): 889–892. doi: https://doi.org/10.1130/G22629.1 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 SocietyGeology Search Advanced Search Abstract Ring-shear experiments were used to study subglacial sediment deformation and the development of S-matrix microstructures and microshears to constrain glacially induced deformation in diamicts. The experiments approximated subglacial conditions, and the diamict was sheared and sampled incrementally to strains of 0, 7, 18, 33, 57, and 107. At strains between 7 and 18, a steady association of S-matrix microstructures developed, which did not evolve further despite continued shearing. The IL-index, a measure of microshear-orientation strength parallel to the shearing direction correlates log-linearly with strain, which indicates its potential use as strain proxy. The ring-shear data were compared with the characteristics of Quaternary basal tills from Denmark, Poland, and Svalbard. Based on IL-index values, we conclude that these tills only experienced strain of ∼101, which is orders of magnitude lower than expected for deformation tills. This suggests that pervasive subglacial deformation and sediment advection in the mobile layer at the ice-bed interface may be less significant than previously assumed. 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 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 | 0.000 | 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".