AEM Greenland 1998 (2) - Airborne GEOTEM magnetic survey over J.C. Christensen Land in central North Greenland
Bibliographic record
Abstract
The survey area for AEM Greenland 1998 (2) is located in the north-eastern J.C. Christensen Land, eastern North Greenland, with additional reconnaissance lines in eastern Peary Land, North Greenland. Measurements included acquisition of controlled source electromagnetic data (GEOTEM -time domain EM) and total field magnetic data.The survey (size of 1603km2) was collected by Geoterrex-Dighem Ltd. and financed by the Government of Greenland. The survey was flown with lines directed along NE45.8 deg and distance between lines of 400 metres. Orthogonal tie-lines were flown with a line separation of 4000 metres. Predominantly sedimentary rocks are exposed in North Greenland. Basin developments are separated by episodes of deformation caused by compressional loading of the crust. Crystalline basement rocks of early Proterozoic and Archean age crop out at the head of Victoria Fjord, but basement rocks have not been located in J.C. Christensen Land. A volcanic unit with widespread occurrence east of Independence Fjord intruded a thick sequence of undeformed Proterozoic sandstones. Rock outcrops in J.C. Christensen Land are controlled by a number of faults. The strikes of the faults are dominantly north-easterly and west-south-westerly; they are considered to be of importance in relation to the Cu-mineralizations reported at several locations within the area. The reconnaissance lines in eastern Peary Land covers the boundary between the Franklinian Basin and the Permian Wandel Sea Basin, which is intersected by a large number of faults. At Citronen Fjord in Peary Land a significant Pb-Zn mineralization was discovered by Platinova A/S in 1993. The mineralization is located in the Ordovician Amundsen Land Group of the Franklinian Basin and is interpreted to be of sedimentary-exhalative type. The overall base metal resource is estimated at 20 million tons stratiform ore of 7% zinc, including 7 million tons containing 9% zinc and 1% lead. The latest update by Ironbark Zinc Limited in 2017 makes this one of the biggest deposits in the world, and preparations for the opening of a mine is ongoing.
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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 | 0.001 |
| 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) | 0.003 | 0.001 |
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".