Neoproterozoic and Cambro-Ordovician magmatism: episodic growth and reworking of continental crust, Himachal Himalaya, India
Bibliographic record
Abstract
U-Pb SHRIMP and LA-MC-ICP-MS zircon dates from Dalhousie and Dhauladhar granite yield weighted mean ages of 900 to 700 Ma for magmatic cores. The rim has an age of 460 Ma age, representing the time of reworking of early Neoproterozoic bodies during Cambro-Ordovician time. The plutons are composed of granite, monzogranite, and granodioritic having a peraluminous character with pronounced Eu anomaly. Higher Rb content and Rb/Sr ratio along with REE enrichment in Dalhousie granite show that the body is more evolved than Dhauladhar granite. New U-Pb data from Dalhousie and Dhauladhar areas suggest that Cambro-Ordovician continental magmatism took place within the Greater India by reworking of already existing Neoproterozoic granite. These two magmatic episodes can be correlated with the amalgamation of Gondwanaland over granite that formed during the Rodinia break-up.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.005 |
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".