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Economic Geology; April 1989; v. 84; no. 2; p. 434-443; DOI: 10.2113/gsecongeo.84.2.434
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Mineral reactions in manganese oxide rocks; P-T-X phase relations

Somnath Dasgupta, Pulak Sengupta, P. K. Bhattacharya, M. Mukherjee, M. Fukuoka, H. Banerjee, and Supriya Roy

Jadavpur Univ., Dep. Geol. Sci., Calcutta, India

Phase relations of braunite, hausmannite, jacobsite, bixbyite, hematite, pyrolusite, quartz, and rhodochrosite in the system Mn-Fe-Si-C-O and the subsystem Mn-Fe-Si-O are evaluated using petrographic and thermodynamic data. The results are applicable to metamorphosed Mn oxide-rich rocks occurring in various parts of the world. Petrogenetic grids are constructed in isobaric log f (sub O 2 ) - T space and the dependence of the mineral reactions on X (sub CO 2 ) fluid is evaluated.

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This article has been cited by other articles:


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P-T-X relationships during metamorphism of manganese-rich sediments: Current status and future studies
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[Abstract] [PDF]


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