Fluid inclusions in zoisite from the Merelani Hills deposit, Tanzania

Kazantseva М. I., Ponomareva N. I., Bocharov V. N.

Zapiski RMO (Proceedings of the Russian Mineralogical Society). 2018. V. 147. N 3. P. 69-81

https://doi.org/10.30695/zrmo/2018.1473.05

Full text is available on eLIBRARY.RU

Language: Russian

Abstract

The study was focused upon fluid inclusions in zoisite from the Merelani Hills deposit (Northern Tanzania) — they are characterized by the unique composition. The Raman spectroscopy has detected there mostly the system H₂S (N₂) (CH₄), together with remarked presence of liquid H₂O and the ion HS–. Solid phases in inclusions are identified as graphite, calcite, quartz, dickite, micas, and the native sulfur (S₈). The average temperature of partial homogenization corresponds for gas-liquid inclusions, according to authors, is equal to 60—70 °C, complete homogenization and dissolution of solid phases occurs at temperature about 400 °C (Malisa et al., 1986). Physical-chemical parameters of the zoisite formation were estimated with techniques of chemical thermodynamic calculation: Eh ≤ –0.2; pH ≤ 6.4.

Key words: zoisite, fluid inclusions, Raman spectroscopy, Merelani Hills deposit, mineralization conditions.