Secular isotopic variation in lithospheric mantle through the Variscan orogen: Neoproterozoic to Cenozoic magmatism in continental Europe
Bibliographic record
Abstract
Research Article| May 02, 2019 Secular isotopic variation in lithospheric mantle through the Variscan orogen: Neoproterozoic to Cenozoic magmatism in continental Europe Jaroslav Dostal; Jaroslav Dostal 1Department of Geology, Saint Mary's University, 923 Robie Street, Halifax, Nova Scotia B3H 3C3, Canada Search for other works by this author on: GSW Google Scholar J. Brendan Murphy; J. Brendan Murphy 2Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada3Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia Search for other works by this author on: GSW Google Scholar J. Gregory Shellnutt J. Gregory Shellnutt 4Department of Earth Sciences, National Taiwan Normal University, 88 Tingzhou Road Section 4, Taipei 11677, Taiwan Search for other works by this author on: GSW Google Scholar Author and Article Information Jaroslav Dostal 1Department of Geology, Saint Mary's University, 923 Robie Street, Halifax, Nova Scotia B3H 3C3, Canada J. Brendan Murphy 2Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada3Earth Dynamics Research Group, ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia J. Gregory Shellnutt 4Department of Earth Sciences, National Taiwan Normal University, 88 Tingzhou Road Section 4, Taipei 11677, Taiwan Publisher: Geological Society of America Received: 29 Jan 2019 Revision Received: 27 Mar 2019 Accepted: 10 Apr 2019 First Online: 02 May 2019 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2019 Geological Society of America Geology (2019) 47 (7): 637–640. https://doi.org/10.1130/G46067.1 Article history Received: 29 Jan 2019 Revision Received: 27 Mar 2019 Accepted: 10 Apr 2019 First Online: 02 May 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jaroslav Dostal, J. Brendan Murphy, J. Gregory Shellnutt; Secular isotopic variation in lithospheric mantle through the Variscan orogen: Neoproterozoic to Cenozoic magmatism in continental Europe. Geology 2019;; 47 (7): 637–640. doi: https://doi.org/10.1130/G46067.1 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 The evolution of the mantle source beneath a terrane is recorded by the Sm-Nd isotopic systematics of mafic rocks over extended periods of time. The evolution of the mantle beneath the Variscan massifs of continental Europe is tracked in order to examine the coupling between the crust and underlying continental lithospheric mantle during the late Paleozoic Variscan orogeny. Late Neoproterozoic and early Paleozoic (Cambrian–Devonian) extension-related mafic rocks have εNd(t) values similar to depleted mantle and so were probably derived from juvenile mantle sources. Thus, weak deformation and low-grade metamorphism associated with the ca. 540 Ma Cadomian orogeny did not change the mantle source beneath the Variscan massifs. In contrast, late Carboniferous–Permian mafic magmatism, which erupted in the aftermath of the collision between Gondwana and Laurussia, is characterized by negative εNd(t) values and significantly older depleted mantle model ages (TDM = 1800–800 Ma), suggesting derivation from a lithospheric mantle contaminated by late Paleozoic subduction. This characteristic is shared by most Variscan massifs, and it is consistent with the vast tracts of allochthonous peri-Gondwanan terranes exposed within the orogen, which suggest regional crust-mantle decoupling during Variscan collision. The regionally extensive Cenozoic European Volcanic Province has higher εNd(t) values (+5 to +7) and significantly lower TDM ages (ca. 500–100 Ma), suggesting that the continental lithospheric mantle was refertilized. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| 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) | 0.015 | 0.002 |
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; both teacher heads agree on what is shown here.
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".