From f758c74a9d6e303123967a1f71c1d1e99cf12a07 Mon Sep 17 00:00:00 2001 From: Romain Tilhac Date: Sat, 17 Aug 2024 17:19:40 +0200 Subject: [PATCH] Update fieldguide.md --- fieldguide.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fieldguide.md b/fieldguide.md index d88a811..dc6d12c 100644 --- a/fieldguide.md +++ b/fieldguide.md @@ -120,8 +120,8 @@ More work was then carried out by a Spanish and French collaboration (Arenas et #### Melt-peridotite interaction in an arc root The layered pyroxenite-dunite association exposed in the *Herbeira* cliffs was specifically interpreted as the magmatic stratigraphy of a lower-crustal cumulate in an arc root, based on increasing platinum-group element (PGE) content (from the PGE-poor lower dunite to the PGE-rich upper dunite) and progressive PGE fractionation (_i.e._ Pd-Pt enrichment; **Fig_PGE**) in chromitites (Moreno, 1999, Moreno et al. 1999, Moreno et al., 2001). This arc-related interpretation provided a better explanation to the residual character of the harzburgites which was confirmed by Santos et al. (2002) based on mantle-array-like Ol chemistry (_i.e._ ~0.4 % NiO, Fo90; **Fig_FoNiO**). The latter authors also identified a fractional crystallization trend of decreasing NiO and Fo in Ol between the pyroxenites and dunites. They considered lithological heterogeneity of the *Herbeira* massif reflects a "mantle wedge" (in broad sense) modified by slab-derived fluids or melts. - - + + > Add figure caption.