Major-element geochemistry of pelites

Review Geochemistry & Geophysics

A review of the geochemical changes occurring during metamorphic devolatilization of metasedimentary rocks

Aleksandr S. Stepanov

Summary: The redistribution of elements by fluids produced by metamorphic devolatilization is a major process responsible for crustal differentiation. Geochemical changes caused by devolatilization vary in different metamorphic complexes, with some elements depleted in almost all complexes. This process has the potential to concentrate dispersed elements into ore-grade mineralization, particularly in the formation of orogenic gold deposits.

CHEMICAL GEOLOGY (2021)

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Article Mineralogy

IMA-CNMNC approved mineral symbols

Laurence N. Warr

Summary: This contribution presents the first International Mineralogical Association (IMA) Commission on New Minerals, Nomenclature and Classification (CNMNC) approved collection of 5744 mineral name abbreviations by combining four methods of nomenclature based on the Kretz symbol approach. The collection incorporates 991 previously defined abbreviations for mineral groups and species and presents a further 4753 new symbols that cover all currently listed IMA minerals. Adopting IMA-CNMNC approved symbols is considered a necessary step in standardising abbreviations by employing a system compatible with that used for symbolising the chemical elements.

MINERALOGICAL MAGAZINE (2021)

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Article Geochemistry & Geophysics

Ferrous/ferric (Fe2+/Fe3+) partitioning among silicates in metapelites

Jacob B. Forshaw et al.

Summary: Fe3+ and XFe3+ are key parameters in phase equilibrium modeling but can only be estimated using certain techniques. Analyses of XFe3+ in different minerals show variations, influenced by the type of Fe-oxide present in the rocks.

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY (2021)

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Article Geology