European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 3
Articles | Volume 38, issue 3
https://doi.org/10.5194/ejm-38-263-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-263-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 3
Research article
 | 
11 May 2026
Research article |  | 11 May 2026

Retrograde crystallization of clay minerals in metamorphic rocks linked to fluid circulation related to fault activity

Isabel Abad, Matías Reolid, Juan Jiménez-Millán, and Fernando Nieto

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Short summary
Metamorphic rocks affected by a fault have undergone chemical, mineralogical, and textural changes. The most significant is the enrichment in clay minerals (chlorite, kaolinite, and smectite). Geothermometry of the new chlorites made it possible to determine the temperatures of the processes (predominantly < 225°C), promoted by the fault dynamics (mainly fluid-related alterations). The retrograde alteration also affected the fluid-accessible zones of the original rocks, with growth of the same clay minerals.
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