Mineralium Deposita

, Volume 7, Issue 1, pp 13–17 | Cite as

Textural and chemical evidence bearing on sulfide-silicate reactions in metasediments

  • W. J. Mallio
  • M. A. Gheith
Article
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Abstract

Two textural relationships between pyrrhotite and ferromagnesian silicates were found to occur in a metamorphosed sandy pelite at the staurolite grade of metamorphism. (1) Increased grain size of silicates at the pyrrhotite-silicate boundary; (2) Oriented intergrowths of pyrrhotite in large grains of chlorite and biotite. Both textures were interpreted as resulting from sulfide-silicate reactions. Ferromagnesian silicates in these sulfidic rocks show higher Mg/Fe ratios than those in non-sulfidic rocks in the same area.

Keywords

Grain Size Mineral Resource Chemical Evidence Textural Relationship Ferromagnesian Silicate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

In einem bis zur Staurolith-Fazies metamorphosierten ehemaligen sandigen Pelit werden zwei Gefügebeziehungen zwischen Magnetkies und Eisen-Magnesium-Silikaten festgestellt: (1) Eine Kornvergrößerung der Silikate an der Grenze Magnetkies—Silikate; (2) Eine orientierte Verwachsung von Magnetkies mit großen Kristallen von Chlorit und Biotit. Beide Gefüge werden als Reaktionsgefüge zwischen Sulfiden und Silikaten gedeutet. Die Eisen-Magnesium-Silikate zeigen in diesen Gesteinen reich an Sulfiden höhere Mg/Fe-Verhältnisse als in sulfidfreien Gesteinen desselben Gebietes.

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Copyright information

© Springer-Verlag 1972

Authors and Affiliations

  • W. J. Mallio
    • 1
  • M. A. Gheith
    • 1
  1. 1.BostonUSA

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