Academic Journal
Nitrogen under super-reducing conditions:Ti oxynitride melts in xenolithic corundum aggregates from Mt Carmel (n. Israel)
| العنوان: | Nitrogen under super-reducing conditions:Ti oxynitride melts in xenolithic corundum aggregates from Mt Carmel (n. Israel) |
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| المؤلفون: | Griffin, William L., Gain, Sarah E. M., Saunders, Martin, Alard, Olivier, Shaw, Jeremy, Toledo, Vered, O'reilly, Suzanne Y. |
| المصدر: | Griffin , W L , Gain , S E M , Saunders , M , Alard , O , Shaw , J , Toledo , V & O'reilly , S Y 2021 , ' Nitrogen under super-reducing conditions : Ti oxynitride melts in xenolithic corundum aggregates from Mt Carmel (n. Israel) ' , Minerals , vol. 11 , no. 7 , 780 , pp. 1-15 . https://doi.org/10.3390/min11070780 |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | titanium nitrides, oxynitrides, methane–hydrogen fluids, mantle mineralogy, reducing conditions, Mt Carmel |
| الوصف: | Titanium oxynitrides (Ti(N,O,C)) are abundant in xenolithic corundum aggregates in py-roclastic ejecta of Cretaceous volcanoes on Mount Carmel, northern Israel. Petrographic observa-tions indicate that most of these nitrides existed as melts, immiscible with coexisting silicate and Fe-Ti-C silicide melts; some nitrides may also have crystallized directly from the silicide melts. The TiN phase shows a wide range of solid solution, taking up 0–10 wt% carbon and 1.7–17 wt% oxygen; these have crystallized in the halite (fcc) structure common to synthetic and natural TiN. Nitrides coexisting with silicide melts have higher C/O than those coexisting with silicate melts. Analyses with no carbon fall along the TiN–TiO join in the Ti–N–O phase space, implying that their Ti is a mixture of Ti 3+ and Ti 2+ , while those with 1–3 at.% C appear to be solid solutions between TiN and Ti0.75O. Analyses with >10 at% C have higher Ti 2+ /Ti 3+ , reflecting a decrease in fO2. Oxygen fugacity was 6 to 8 log units below the iron–wüstite buffer, at or below the Ti2O3–TiO buffer. These relation-ships and coexisting silicide phases indicate temperatures of 1400–1100 °C. Ti oxynitrides are prob-ably locally abundant in the upper mantle, especially in the presence of CH4–H2 fluids derived from the deeper metal-saturated mantle. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| DOI: | 10.3390/min11070780 |
| الاتاحة: | https://researchers.mq.edu.au/en/publications/5b9bee7d-dc99-447a-99d0-92018fc03199 https://doi.org/10.3390/min11070780 https://research-management.mq.edu.au/ws/files/175750841/175328781.pdf http://www.scopus.com/inward/record.url?scp=85110101983&partnerID=8YFLogxK |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.9B818A63 |
| قاعدة البيانات: | BASE |
| DOI: | 10.3390/min11070780 |
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