Bibliographic record
Abstract
Impact cratering must be one of the most spectacular displays ever witnessed in the solar system.Although the ancient Indian astronomers, the ancient Vedic texts and the poets who have chronicled the history of India in the great Ra ma yana and Maha bha rata, described heavenly events in the past in lines of great poetic beauty, the subject has not evoked much interest in the modern generation of geoscientists.India has a hoary tradition of study of astronomical bodies, but these studies have come to be neglected, considered more as myths deserving no serious attention. Impact Metallogeny"Impact Metallogeny" may be defined as the study of major metallic and diamond deposits from the perspective of extra-terrestrial impacts that have been directly or indirectly responsible for metallogeny.An increasingly large body of evidence -geochemical (trace and rare element data, stable isotope systematics, field and structural data, geographical distribution patterns) is pointing to a causal link between impact processes and metallogeny either directly or indirectly.My plea is to re-examine our known large metallic and diamond areas from this fresh perspective so that we identify and characterise major impact structures and related metallogeny in the Indian sub-continent. The Mystery of Abnormal Concentration of Metals at Selected 'Hot Spots' in the EarthSpectacular concentrations of gold and uranium are to be found in the Witwatersrand Basin in South Africa, from where over 50,000 tonnes of gold have already been extracted and another 50,000 tonnes indicated in reserve; at Homestake Mines, (South Dakota); Colorado Mineral belt with its several large deposits; at Porcupine district of Ontario, (Canada); at Cadea (New South Wales), Kalgoorlie, Bendigo and Ballarat of Victoria, (Australia); nickel and platinum group elements at Sudbury (Canada); chromite, nickel and platinum at Bushveld (South Africa); nickel in Zimbabwe (Africa).Lead and zinc deposits (Australia).Quite a few remarkably large concentrations of metals in Russia, China and Indonesia and uranium-bearing conglomerate at Blind River, (Canada); tin deposits in Malaysia; gold deposits at Kolar and Hutti (India).The distribution of rich concentrations appears to be at random and no particular reason could currently be given for such extraordinary enrichment within a very restricted area.Why is this randomness in distribution and exceptional enrichment confined to selected hot spots in the outer skin of planet Earth?Let us take a look at how Earth originated.
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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 | 0.001 |
| 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".