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Inter-phase Partitioning of Pb and Zn in Granitoid Fluid-Magmatic Systems: Experimental Studyстатья
- Автор: Chevychelov V.Yu
- Сборник: Advances in Experimental and Genetic Mineralogy
- Серия: Special Publication to 50th Anniversary of DS Korzhinskii Institute of Experimental Mineralogy of the Russian Academy of Sciences. Litvin Yu.A. Safonov O.G (Editors)
- Том: 11
- Глава в коллективной монографии
- Год издания: 2020
- Издательство: Springer International Publishing
- Местоположение издательства: New York
- Первая страница: 289
- Последняя страница: 336
- Номер статьи: Chapter 13
- DOI: 10.1007/978-3-030-42859-4_13
- Аннотация: Experimental studies of the partitioning of Pb and Zn between the fluid and the granite melt have shown that relatively low pressure (~100 MPa) and temperature (~750oC) and acidic chloride composition of the fluid (0.1N HCl+1N NaCl) will promote the best extraction these metals from the melt. Herein the partition coefficients are fluid/meltDPb,Zn ≥ 10. In systems with acidic chloride fluids these coefficients increase proportionally to the square of the fluid chloride concentration: fluid/meltDPb ≈(7±1.6)×fluidCCl2 and fluid/meltDZn ≈(5.7±2.0)×fluidCCl2, which allows us to assume pure chloride complexes in these systems for Pb+2 and Zn+2. Increases in temperature and, in particular, pressure significantly reduce the partition coefficients of these metals. At the conditions of two-phase fluid of composition of H2O-NaCl there is a significant (~5-7 times) accumulation of Pb and Zn in the dense water-salt fluid phase relatively low-density essentially aqueous phase. The addition of CO2 to the fluid increases the concentration of these metals in the water-salt phase, and for Pb it is much higher than for Zn. In the process of crystallization of granite melt at pressure of ~500 MPa polymetals do not pass into the nascent fluid. Herein Pb is concentrated in crystallizing feldspars (Olg and Kfs), and Zn remains in the residual melt. With decreasing pressure (up to ~250 MPa) the fluid is visibly enriched with polymetals, and the content of Pb and Zn become almost the same in the fluid and in feldspars, except for the sharply lower content of Zn in Ab and Ancl. At change of composition of melt from granite to andesite and basalt the partition coefficients, fluid/meltDPb,Zn, sharply decrease (on ~1.5-2 orders of magnitude); positive linear correlation dependences between coefficients of fluid/meltDPb,Zn and silica content in melt are established (RPb = 0.95, and RZn = 0.93).
- Добавил в систему: Чевычелов Виталий Юрьевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | ChevychelovVYu_2020_Adv_Exper_Chapter_13.pdf | 718,5 КБ | 20 ноября 2020 [Chevychelov] | |
| 2. | Contents.pdf | Contents.pdf | 26,8 КБ | 20 ноября 2020 [Chevychelov] | |
| 3. | Первая страница | Title.pdf | 11,8 КБ | 20 ноября 2020 [Chevychelov] |