Sr–Nd–Pb–Hf isotopic constraints on the diversity of magma sources beneath the Aden Ridge (central Gulf of Aden) and plume–ridge interaction

Abstract

This paper presents new Sr-Nd-Pb-Hf isotopic compositions of tholeiitic basalts dredged along the Aden Ridge of the central Gulf of Aden (45.5°E-49°E). Two groups of basalts are identified based on their contrasting spatial distributions and geochemical signatures. Basalts dredged from east of 46.2°E (Group 1) are LREEdepleted but have relatively wide variations in

From rifting to oceanization in the Gulf of Aden: Insights from 2D numerical models

“…In proximity to plumes, midocean ridge basalts (MORB) can have H 2 O percentages up to 0.03-0.1%, similar to those observed in oceanic island basalts (OIB) (Dixon et al, 2002;Hirschmann, 2006). This feature can also be observed in the central and eastern parts of the Gulf of Aden, where basalts show the geochemical signature of normal MORB (N-MORB) (Rooney et al, 2014;Shinjo et al, 2015) incorporating a component from a plume-associated source. Therefore, we considered the solidus of a wet lherzolite with a bulk of H 2 O between 0.05 and 0.1%.…”