Aeromagnetometry and aerogammaspectrometry integrated with U-Pb zircon geochronology of northern Bossoroca ophiolite, Brasiliano Orogen

A suture related accretionary wedge in the Gondwana assembly: Insights from serpentinites in the Hoggar shield, Algeria

“…The presence of two different ages (770 and 630 Ma) would then suggests the precipitation of zircons at two metasomatic events that may corresponds to mantle wedge and exhumation stages. Similar interpretation was suggested for zircons within metasomatic chloritites, in serpentinites from the southern Brasiliano orogen (Arena et al, 2017;Hartmann et al, 2021).…”

“…14a), only two zircons with significant sizes (65 and 200 μm) were detected. Zircon crystals frequently occurs in mafic dikes intruded into peridotites (eg., Kaczmarek et al, 2007) but it has also been reported in metasomatic chloritites (eg., Arena et al, 2017;Hartmann et al, 2021). Evidence has been presented that zircons may form during metasomatism of harzburgite by basaltic liquid and volatile-rich accompagnying fluids (Griffin et al, 2000;Grieco et al, 2001;Dubinska et al, 2004).…”