Sample of Epidosite

Epidosite (/ɪˈpɪdəst/) is a highly altered epidote and quartz bearing rock.[1] It is the result of slow hydrothermal alteration or metasomatism of the basaltic sheeted dike complex and associated plagiogranites that occurs below the massive sulfide ore deposits which occur in ophiolites.[2][3][4] Most epidosites represent the zone of intense metal leaching below and lateral to the sulfide deposits which is the result of convection of heated ocean water through the fractured basalts of the sheeted dikes.[2][3] Some epidosites form by hydrothermal fluids exsolved from plagiogranitic magma. These epidosites contain allanite, a REE-rich member of the epidote group.[4][5]


  1. ^ Peter T Flawn (1951). "Nomenclature of epidote rocks". American Journal of Science. 249 (10): 769–777. doi:10.2475/ajs.249.10.769.
  2. ^ a b Banerjee, Neil R., et. al., Discovery of epidosites in a modern oceanic setting, the Tonga forearc, Geology, February, 2000 v. 28, no. 2, p. 151-154
  3. ^ a b Lori Bettison-Varga, Robert J. Varga and Peter Schiffman, Relation between ore-forming hydrothermal systems and extensional deformation in the Solea graben spreading center, Troodos ophiolite, Cyprus, Geology, 1992, v. 20 no. 11 p. 987-990
  4. ^ a b Michael Anenburg; Yaron Katzir; Dieter Rhede; Niels Jöns; Wolfgang Bach (2015). "Rare earth element evolution and migration in plagiogranites: a record preserved in epidote and allanite of the Troodos ophiolite". Contributions to Mineralogy and Petrology. 169: 25. doi:10.1007/s00410-015-1114-y.
  5. ^ Michael Anenburg; Simon Jowitt; Yaron Katzir; Niels Jöns (2017). "Sub-seafloor self-metasomatism and REE mobility in and around plagiogranites: Allanite and epidote of the Troodos ophiolite epidosites". Figshare. doi:10.6084/m9.figshare.4640299.v1.

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