The role of hydrothermal fluids in the production of subduction zone magmas: Evidence from siderophile and chalcophile trace elements and boron

Thallium elemental behavior and stable isotope fractionation during magmatic processes

“…However, study of sulphur-rich ore deposits (Baker et al 2010) Most recently, Nielsen et al (2014) have shown that the only phase housing significant Tl in the lherz massif are interstitial sulphides, which yielded variable concentrations from 23 to 430 ng/g. Noll et al (1996) assumed that Tl behaved as a chalcophile element and used chalcophile/lithophile element ratios in subductionrelated lavas to determine relative fluid mobility of trace elements. They suggested that Tl has a similar bulk partition coefficient to La, but admitted their Tl data was 'perplexing' in that they expected to see indications of fluid mobility, yet Tl did not correlate with 'fluid-mobile' elements such as As, Sb and Pb.…”

Deciphering petrogenic processes using Pb isotope ratios from time-series samples at Bezymianny and Klyuchevskoy volcanoes, Central Kamchatka Depression

“…10). These values are within the range of typical arc basalts (1-10: Miller et al 1994;Noll et al 1996;Plank 2005) and are low compared to MORB values (Hofmann 1988). The lower Ce/Pb ratios of arc basalts reflect addition of a slab fluid (Brenan et al 1994;Miller et al 1994), or partial melt of the subducting slab or sediment (Tatsumi 2000; Kelemen et al 2003 Fig.…”

“…The relatively unconstrained nature of AFC model parameters in the CKD does not justify a more complex formulation than the essential batch melting, assimilation and fractionation process we calculate here using equations of DePaolo (1981). A high-alumina basalt composition measured from Klyuchevskoy (Kersting and Arculus 1995) -10: Miller et al 1994;Noll et al 1996;Plank 2005). Sediment addition from the subducted slab would impart a high Ce/Pb ratio; however, the Ce/Pb ratios between Bezymianny and Klyuchevskoy are similar.…”

Mineralogy, geochemistry and sulfur isotope characterization of Cerro de Maimón (Dominican Republic), San Fernando and Antonio (Cuba) lower Cretaceous VMS deposits: Formation during subduction initiation of the proto-Caribbean lithosphere within a fore-arc

“…In general, the geochemical behavior of Sb is similar to that of Pb (Noll et al, 1996) and, in subduction environments, is described to be even more mobile (Jochum and Hofmann, 1997);…”

“…In intraoceanic settings, Timm et al (2012) summarized that arc-related mafic lavas are enriched in most of the siderophile and chalcophile elements when compared to MORB; these workers attributed this fact to metasomatism of the suprasubduction mantle by hydrous melts derived from the downgoing slab, the input of which can be further traced from back-arc to arcfront positions. Chalcophile elements such as As and Sb are highly mobile in hydrous fluids under oxidizing mantle conditions (Noll et al, 1996) and can be fluid-transported from the slab to the melting region in the suprasubduction zone. Among other parameters (e.g.…”