European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 2
Articles | Volume 38, issue 2
https://doi.org/10.5194/ejm-38-179-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-38-179-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 2
Research article
 | 
09 Apr 2026
Research article |  | 09 Apr 2026

Hydrous partial melting in gabbros drilled at the Southwest Indian Ridge (ODP Hole 735B): evidence from microstructures at grain boundaries

Jürgen Koepke

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Short summary
Gabbroic rocks from the Southwest Indian Ridge have been investigated. The results show that hydrous partial melting triggered by hydrothermal fluids percolating on grain boundaries above the wet gabbro solidus is a common process at slow-spreading mid-ocean ridges. The main indication of this process is plagioclase strongly enriched in anorthite content at grain boundaries, which can only be identified via backscattered electron imaging and related electron microprobe profiles.
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