Conference
Copper Partitioning in CO2-Bearing Melt-Vapor-Brine Systems
| العنوان: | Copper Partitioning in CO2-Bearing Melt-Vapor-Brine Systems |
|---|---|
| المؤلفون: | Tattitch, Brian C, Candela, Philip, Piccoli, Philip, Bodnar, Robert J., Fedele, Luca |
| المصدر: | Tattitch , B C , Candela , P , Piccoli , P , Bodnar , R J & Fedele , L 2012 , ' Copper Partitioning in CO2-Bearing Melt-Vapor-Brine Systems ' , Goldschmidt , Montreal , Canada , 24/06/12 - 29/06/12 . |
| سنة النشر: | 2012 |
| المجموعة: | University of Bristol: Bristol Reserach |
| الوصف: | Analysis of fluid and melt inclusions from arc-related intrusions and porphyry copper deposits (PCD) reveal that many fluid inclusions from PCD are typically characterized by XCO2 < 0.10, which is lower than that found in volatile phases exsolved from shallow (e.g., 5 to 10 km), arc magmas, in general (XCO2 up to order ~ 0.45). This disparity remains to be resolved. The efficiency with which copper can be removed from arc magmas into exsolving volatile phases is a function of the competition between crystalline phases (± liquid sulphides), and the exsolving vapor ± brine. Experiments in melt-vapor-brine systems permit the investigation of the partitioning of copper between silicate melts and volatile phases under magmatic conditions. However, the effect of CO2 on melt-volatile phase equilibria relevant to the formation of PCD has remained unconstrained. In this study, the partitioning of copper in CO2-bearing, sulfur-free and sulfur-bearing, experiments may provide additional insights into copper partitioning and the generation of PCD. We present results from experiments performed at 800 oC and 100 MPa in CO2-bearing, sulfur-free and sulfur-bearing melt-vapor-brine systems with XCO2 (bulk vapor ± brine) = 0.10 and 0.38. The compositions of vapor and brine inclusions and run-product glasses were used as proxies for the compositions of the magmatic phases. The salinities of vapor inclusions that nucleated clathrate (CO2 ± H2S clathrate) upon cooling were determined via Raman analysis and microthermometry [1]. The partitioning of copper between brine and vapor (Db/vCu(±2σ)) increases from 25(±6) to 100 (±30) for sulfur-free experiments and from 11(±3) to 95(±23) for sulfur-bearing experiments, as XCO2 is increased from 0.10 to 0.38. The partitioning of copper between vapor and melt increases with the addition of sulfur at XCO2 = 0.10: (Dv/mCu (±2σ)) = 9.6(±3.3) (sulfur-free, metaluminous melt); 18(±8) (sulfur-bearing, peralkaline melt); and 30(±11) (sulfur-bearing, metaluminous melt). These values are to be ... |
| نوع الوثيقة: | conference object |
| وصف الملف: | application/pdf |
| اللغة: | English |
| الاتاحة: | https://hdl.handle.net/1983/a371b9ec-c3da-4fd4-8884-4b52b08c1033 https://research-information.bris.ac.uk/en/publications/a371b9ec-c3da-4fd4-8884-4b52b08c1033 https://research-information.bris.ac.uk/ws/files/8647408/Tattitch_Goldschmidt2012.pdf |
| Rights: | info:eu-repo/semantics/restrictedAccess |
| رقم الانضمام: | edsbas.14A2529 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |