Early pyroxene crystallisation deep below mid-ocean ridges: Supplementary data of gabbro phase mapping

The data repository contains part of the original microscopy imagery datasets from optical microscopy, electron microscopy backscattered electron (SEM-BSE), and Synchrotron X-ray fluorescence microscopy (XFM) experiments presented in Ubide et al. (2025) 'Early pyroxene crystallisation deep below mid-ocean ridges' by Teresa Ubide*, David T Murphy, Robert B Emo, Michael Jones, Marco Acevedo Zamora, and Balz S Kamber Specifically, it includes the QuPath software (Bankhead et al., 2017) project including rock (mid-ocean ridge olivine gabbro) thin sections 81-R5w and 80-R6w. The project contains the semantic image segmentation outputs generated with the Pixel Classifier and MatLab script described in Acevedo Zamora et al. 2023 (see code repository). Sample 80-R6w was segmented using image annotations in QuPath and an input comprising a false-colour Cr-Ti-Ca XFM image, cross-polarised light maximum intensity (XPL-max), and plane-polarised light (PPL-0 degrees) photomicrographs. Similarly, Sample 81-R5w used a false-colour Cr-Ti-Ca XFM image, deep sparse autoencoder image representation of XFM (after Acevedo Zamora et al., 2024), cross-polarised light (XPL-0 degrees), plane-polarised light (PPL-0 degrees) photomicrographs, and recoloured SEM-BSE (after Acevedo Zamora et al. 2023). The segmentation of both samples provided a conservative estimate of the locations of relict clinopyroxene cores (~4% volume of cpx mask), mantles, and rims in a similar phase map colour scheme for better comparison. If there are questions regarding the utilisation of the data, contact Marco Acevedo ([e-mail] ; [e-mail]).