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Geological Society, London, Special Publications; 1997; v. 119; p. 327-337;
DOI: 10.1144/GSL.SP.1997.119.01.21
© 1997 Geological Society of London

Geochemistry and Mineralogy

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

Somnath Dasgupta

Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India

This paper aims at reviewing the mineralogy, mineral chemistry and petrology of metamorphosed manganese-rich sediments from occurrences described since 1988. It presents a summary of new experimental data and evaluates the merits and shortcomings of the petrogenetic grids so far proposed for Mn-rich metamorphic rocks. The paper focuses on the inadequacies of experimental data on Mn-rich systems and discusses the problems associated with further quantification of the petrogenetic grids. Finally, a few suggestions for future research on Mn-rich systems are put forward.