Effects of black shale weathering on the mobility of rhenium and platinum group elements
Bibliographic record
Abstract
Research Article| May 01, 2000 Effects of black shale weathering on the mobility of rhenium and platinum group elements Bernhard Peucker-Ehrenbrink; Bernhard Peucker-Ehrenbrink 1Woods Hole Oceanographic Institution, MS 25, Woods Hole, Massachusetts 02543-1541, USA Search for other works by this author on: GSW Google Scholar Robyn E. Hannigan Robyn E. Hannigan 1Woods Hole Oceanographic Institution, MS 25, Woods Hole, Massachusetts 02543-1541, USA Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (5): 475–478. https://doi.org/10.1130/0091-7613(2000)28<475:EOBSWO>2.0.CO;2 Article history received: 22 Oct 1999 rev-recd: 14 Feb 2000 accepted: 23 Feb 2000 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Bernhard Peucker-Ehrenbrink, Robyn E. Hannigan; Effects of black shale weathering on the mobility of rhenium and platinum group elements. Geology 2000;; 28 (5): 475–478. doi: https://doi.org/10.1130/0091-7613(2000)28<475:EOBSWO>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Radiogenic Os from the continents dominates the late Cenozoic marine Os budget. A variety of proposed radiogenic sources includes organic-rich sediments, Precambrian shields, and Re-rich sulfides. Identifying the dominant sources of radiogenic Os to the oceans has a strong impact on past climate models because weathering of silicates acts as a net sink of CO2, whereas weathering of organic matter acts as a source. Here we investigate the effects of black shale weathering on the integrity of the Re-Os isotope system and release of Re and platinum group elements. Time-correlative pairs of fresh (drill core) and weathered (outcrop) black shales of Late Ordovician age (Utica Shale magnafacies, Québec) were analyzed for Re, Os, Ir, Pt, and Pd, as well as total S, N, and C (as Ccarb and Corg). The results indicate that 25%–64% of the initial Re budget, 45%–90% of the Os budget, 14%–65% of the Ir budget, 60%–77% of the Pt budget, 69%–86% of the Pd budget, and 44%–96% of the Corg budget are lost during weathering. We use positive correlations of Os, Pt, and Pd with Corg and N to calculate the respective platinum group element concentrations in the unweathered organic matter end member as ∼3 ng/g Os, ∼9 ng/g Pt, and 11–24 ng/g Pd. Although black shales make up <1% of the continental crust, mass-balance calculations indicate that such facies contribute significantly to the labile Os inventory of the continental crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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".