Tracing the composition and origin of fluids at an ancient hydrocarbon seep (Hollard Mound, Middle Devonian, Morocco): A Nd, REE and stable isotope study

Oxfordian neptunian dykes with brachiopods from the southern part of the Kraków-Częstochowa Upland (southern Poland) and their links to hydrothermal vents

“…However, the ε Nd values found in sediments filling both the neptunian dykes (particularly the BC) are less radiogenic and the range of ε Nd values is 1.8 (Table 3), which cannot be explained by simple acquisition of Nd from the water column (cf. Jakubowicz et al 2015). Hence, we are of the opinion that the diversity of ε Nd values in the BC dyke representing sediment of the same age must be related to the influence of hydrothermal solutions sourced in the continental crust.…”

“…The primary Ndisotope composition of hydrothermal vents is not derived directly from the water column, but is representative of shallow burial conditions (cf. Jakubowicz et al 2015).…”

Geochemical Evidence for Large‐Scale Drainage Reorganization in Northwest Africa During the Cretaceous

“…To characterize the sedimentary sources of the Cretaceous sediments deposited in the eastern Central Atlantic Ocean, we use a compilation of 794 published Sr and Nd isotope values measured on sedimentary and magmatic rocks of the WAC (supporting information Table S1, Ajaji et al, ; Ali et al, ; Allègre et al, ; Asiedu et al, ; Azzouni‐Sekkal et al, ; Bea et al, ; Blanc et al, ; Boher et al, ; Deckart et al, ; Dia et al, ; D'Lemos et al, ; Dupuy et al, ; El Baghdadi et al, ; Ennih & Liégeois, ; Errami et al, ; Essaifi et al, ; Fullgraf et al, ; Gasquet et al, ; Jakubowicz et al, ; Key et al, ; Kouamelan et al, ; Le Goff et al, ; Meyer et al, ; Montero et al, ; Othman et al, ; Pawlig et al, ; Peucat et al, ; Potrel et al, ; Roddaz et al, ; Samson et al, ; Schaltegger et al, ; Schoepfer et al, ; Soumaila et al, ; Mohammed et al, 2015; Tahiri et al, ; Taylor et al, ; Thomas et al, ; Toummite et al, ; Verati et al, ). This database allows a comprehensive picture of differences in the isotopic composition of the main geological units present in the WAC (Figure c).…”

Differentiating marine vs hydrothermal processes in Devonian carbonatemounds using rare earth elements (Kess Kess mounds, Anti-Atlas, Morocco)

“…As REE patterns of seafloor hydrothermal fluids co-vary with the chemical and physical conditions of fluid-rock interaction, we must consider that SRG overlies a ca. 35 meter thick succession of basaltic rocks (Merzane Group basaltic breccia) which show a distinct positive Eu anomaly (see Jakubowicz et al, 2015). Hydrothermal fluids of relatively high temperatures emanating from oceanic crust show a LREE-enriched pattern relative to mid-ocean ridge basalt (MORB) and frequently show a positive Eu anomaly due to breakdown of plagioclase (e.g.…”

“…The enrichment of REE within the mounds limestones is probably due to a kinetic effect, indeed the slow precipitation of micrite may lead to the adsorption of large quantities of REE (e.g. Webb et al, 2009;Jakubowicz et al, 2015).…”