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


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Language: Russian


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.