Multiple sulfur isotopes reveal a magmatic origin for the Platreef platinum group element deposit, Bushveld Complex, South Africa
Bibliographic record
Abstract
Research Article| December 01, 2008 Multiple sulfur isotopes reveal a magmatic origin for the Platreef platinum group element deposit, Bushveld Complex, South Africa Sarah C. Penniston-Dorland; Sarah C. Penniston-Dorland * 11Department of Geology, University of Maryland, College Park, Maryland 20742, USA *E-mail: sarahpd@geol.umd.edu Search for other works by this author on: GSW Google Scholar Boswell A. Wing; Boswell A. Wing 22Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec H3A 2A7, Canada, and GEOTOP-UQAM-McGill, University of Quebec, Montreal, Quebec H3C3P8, Canada Search for other works by this author on: GSW Google Scholar Paul A.M. Nex; Paul A.M. Nex 33Umbono Group of Companies, Johannesburg, South Africa Search for other works by this author on: GSW Google Scholar Judith A. Kinnaird; Judith A. Kinnaird 44Department of Geological Sciences, University of the Witwatersrand, Private Bag 3, Johannesburg, Wits 2050, South Africa Search for other works by this author on: GSW Google Scholar James Farquhar; James Farquhar 55Department of Geology and the Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, Maryland 20742, USA Search for other works by this author on: GSW Google Scholar Michael Brown; Michael Brown 11Department of Geology, University of Maryland, College Park, Maryland 20742, USA Search for other works by this author on: GSW Google Scholar Elizabeth R. Sharman Elizabeth R. Sharman 22Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec H3A 2A7, Canada, and GEOTOP-UQAM-McGill, University of Quebec, Montreal, Quebec H3C3P8, Canada Search for other works by this author on: GSW Google Scholar Geology (2008) 36 (12): 979–982. https://doi.org/10.1130/G25098A.1 Article history received: 25 Apr 2008 rev-recd: 29 Aug 2008 accepted: 02 Sep 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Sarah C. Penniston-Dorland, Boswell A. Wing, Paul A.M. Nex, Judith A. Kinnaird, James Farquhar, Michael Brown, Elizabeth R. Sharman; Multiple sulfur isotopes reveal a magmatic origin for the Platreef platinum group element deposit, Bushveld Complex, South Africa. Geology 2008;; 36 (12): 979–982. doi: https://doi.org/10.1130/G25098A.1 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 The Platreef ore horizon of the Bushveld Complex, South Africa, is the third largest platinum group element ore deposit in the world, but the origin of its ore remains enigmatic. A complex contact relationship between the igneous and footwall rocks of the Bushveld Complex, coupled with evidence for widespread late-stage hydrothermal processing, obscures the original mineralization history of the Platreef. We constrain the parental magmatic origin of the Platreef by exploiting multiple sulfur isotope contrasts across Bushveld Complex contact zones in order to see through the effects of postmineralization hydrothermal activity. We report S isotope measurements made on samples collected along two profiles through the Platreef into underlying metapelitic and metacarbonate footwall rocks. In both profiles, igneous rocks far from the contact have low Δ33S values (average Δ33S = 0.15‰), whereas metasedimentary rocks far from the contact have high Δ33S values (Δ33S to 5.04‰) with a smoothly varying profile between the two end members. The midpoint in both isotope profiles is displaced into the footwall, defining a classic advective-dispersive tracer geometry. This geometry is not present in the associated δ34S values. The displacement of the Δ33S front suggests fluid transport and advection of S into the country rocks; this was accompanied by back diffusion of the S isotope tracer into the Platreef. The Platreef magma was apparently S saturated prior to emplacement and, counterintuitively, lost S during the formation of the present Platreef ore horizon. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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 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 | 0.000 |
| 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) | 0.005 | 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".