Articles | Volume 38, issue 2
https://doi.org/10.5194/ejm-38-179-2026
https://doi.org/10.5194/ejm-38-179-2026
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

Related authors

ICDP Oman Drilling Project: varitextured gabbros from the dike–gabbro transition within drill core GT3A
Artur Engelhardt, Jürgen Koepke, Chao Zhang, Dieter Garbe-Schönberg, and Ana Patrícia Jesus
Eur. J. Mineral., 34, 603–626, https://doi.org/10.5194/ejm-34-603-2022,https://doi.org/10.5194/ejm-34-603-2022, 2022
Short summary

Cited articles

Berndt, J., Liebske, C., Holtz, F., Freise, M., Nowak, M., Ziegenbein, D., Hurkuck, D., and Koepke, J.: A combined rapid-quench and H2-membrane setup for internally heated pressure vessels: Description and application for water solubility in basaltic melts, Am. Mineral., 87, 1717–1726, 2002. 
Berndt, J., Koepke, J., and Holtz, F.: An experimental investigation of the influence of water and oxygen fugacity on differentiation of MORB at 200 MPa, J. Petrol., 46, 135–167, 2005. 
Bosch, D., Jamais, M., Boudier, F., Nicolas, A., Dautria, J.-M., and Agrinier, P.: Deep and high-temperature hydrothermal circulation in the Oman ophiolite – Petrological and isotopic evidence, J. Petrol., 45, 1181–1208, 2004. 
Boulanger, M., France, L., Ferrando, C., Ildefonse, B., Ghosh, B., Sanfilippo, A., Liu, C. Z., Morishita, T., Koepke, J., and Bruguier, O.: Magma-Mush Interactions in the Lower Oceanic Crust: Insights From Atlantis Bank Layered Series (Southwest Indian Ridge), J. Geophys. Res.-Sol. Ea., 126, https://doi.org/10.1029/2021jb022331, 2021. 
Brophy, J. G. and Pu, X. F.: Rare earth element-SiO2 systematics of mid-ocean ridge plagiogranites and host gabbros from the Fournier oceanic fragment, New Brunswick, Canada: a field evaluation of some model predictions, Contrib. Mineral. Petrol., 164, 191–204, https://doi.org/10.1007/s00410-012-0732-x, 2012. 
Download
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.
Share