Basic Sill Swarms in Wudang Block of the Southern Qinling and Its Geological Significance
Bibliographic record
Abstract
The tabular basic intrusives in Wudang block of Qinling orogen have been recognized as the result of the rifting of Yangtze ancient continent about 800 Ma. But recently, the geologic mapping finished by the authors in the north and southwest of Wudang block and the studying on the isotope geology and geochemistry of the swarms suggest that they are controlled by the major detachment plane of the Paleozoic extensional tectonics. The tabular basic intrusives mainly intruded at the core of the Wudang block, paralleling the boundary of the members of Wudang group, and along the major detachment plane and a series of low angular detachment zones in the basement rocks under the major detachment plane. These bodies, which usually occur on group, are thin in thickness, but extend up to 20km. They are conformity with the layers of the country rocks. It means that they are basic sill swarms and not dike swarms. We have got two sets of U-Pb isotopic ages, the zircons are selected from the basic sills in the southwestern of the block, which are 401 ± 14 Ma and 407 ± 12 Ma respectively. So the sills were intruded in the Devonian. It is in the Devonian that there occurred strongly alkali magmatism in the adjacent area and there were deposited conglomerates around the block. It is very possible that the intrusion of the basic magma suggests that there existed a strongly underplating of magma from the upper mantle in south Qinling during the Devonian. The underplating led the thinning of the upper lithosphere in south Qinling.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".