The Wood Lake, Ontario, H4 ordinary chondrite, a new Canadian meteorite 1
Bibliographic record
Abstract
The Wood Lake meteorite was found in the Muskoka region of Ontario in July 2003. We examine the mineralogy, physical properties, shock, and weathering state of this recently reported Canadian meteorite. Bulk physical properties for Wood Lake (bulk density 3.57 0.10 g/cm 3 , grain density 3.64 0.01 g/cm 3 , and magnetic susceptibility log 5.17) are typical of slightly weathered H chondrite falls and consistent with visual observations of its observed low weathering state (W1). Reconnaissance X-ray micro computed tomography of a Wood Lake fragment yields a similar bulk density (3.56 g/cm 3 ) and allows for a three-dimensional description of the meteorite. Petrographic and electron probe microanalysis examination of the Wood Lake meteorite reveal sharp definition of chondrule margins, occasional mesostasis chondrule glass, only minor development of recrystallized matrix feldspar, and little variation in silicate chemical compositions, indicating Wood Lake to be an H4 ordinary chondrite. Mineral chemistry for Wood Lake olivine (Fa18.6 0.7, n 26) and low-Ca pyroxene (Fs17.5 2.6, n 16) agrees well with H chondrite averages for these minerals. The bulk of the stone has undergone a low to moderate level of shock (S3), as indicated in thin section by undulose optical extinction and the presence of planar dislocations in olivine and pyroxene grains. Moderate distortion of olivine crystal structures observed using in situ micro X-ray diffraction quantifies the shock deformation as a full width half maximum (FWHM) of 3.38° 1.13° (16 reflections from seven olivine grains), consistent with shock stage S3 ordinary chondrites. Wood Lake is confirmed as a new Canadian meteorite find that likely arrived on Earth not long before it was recovered.
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 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 | 0.004 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".