A study in clinopyroxene composition: implications for kimberlite exploration
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Bibliographic record
Abstract
Clinopyroxene is a mineral commonly associated with kimberlite. However, its use as a kimberlite indicator mineral in overburden studies is limited because of its association with many other bedrock types. Historically, the Cr 2 O 3 concentration has been used to identify clinopyroxenes associated with kimberlite intrusions. However, since the Cr 2 O 3 concentrations of clinopyroxene isolated from Ontario kimberlite varies from 0.03 wt% to 3.0 wt% and compositionally overlaps with a variety of other rock types, this approach is ineffective and can be misleading. In an attempt to improve on this technique the role of additional components, such as Al and Na, on the paragenesis of clinopyroxenes is investigated. The entry of Al, Na and Cr into the clinopyroxene structure is controlled by a number of molecules that are discussed in detail. At high pressures (mantle depths) these elements preferentially enter the clinopyroxene structure as jadeite or kosmochlor molecules. To demonstrate this, clinopyroxene data from many sources are presented on a ternary diagram representing atomic proportions of Al, Na and Cr. Clinopyroxenes isolated from kimberlites are unique in that the trend of data extends from the mid portion of the bottom axis (low Cr, high Al and Na) to the mid portion of the right axis (low Al, intermediate Cr and high Na). This trend is consistent with a jadeite–kosmochlor control on the entry of these elements into the mineral structure. A template defining those clinopyroxenes associated with a deep mantle paragenesis and, therefore, an association with kimberlite is presented.
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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 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.010 | 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 it