WebSep 15, 2006 · FOZO, defined by Hart et al. (1992) and constrained in its composition by Hauri et al. (1994), is a component towards which many OIB isotopic compositions tend … WebA theoretical, pure EMII lava composition has been calculated and indicates an extremely smooth trace element pattern of this end-member mantle reservoir. The standard recycling model (of ocean crust/sediment) fails as an explanation for producing Samoan EM2, due to these smooth spidergrams for EM2 lavas, low 187Os/188Os ratios and high 3He/4He ...
Recycled metasomatized lithosphere as the origin of the enriched mantle ...
WebDec 4, 2016 · The composition of pre-metasomatic mantle in Sardinia was intermediate between FOZO and EM1, whereas MORB-type mantle rocks occurred beneath the western Aeolian arc. The upper mantle in the Ernici-Roccamonfina area consisted of a depleted MORB-type peridotite and was affected by two metasomatic events with Roman type … Webmantle reservoir, a mantle portion, physically distinct and potentially accessible, that may result from mixing of mantle components. ... OIB mixing trends converge towards a focal zone (e.g. the FOZO, Focal ZOne; Hart et al., 1992) on the DMM–HIMU edge . Because the tetrahedron can rotate around two of its axes, trends relative to each ocean ... cyber troopers virtual-on xbox
Highly heterogeneous mantle caused by recycling of oceanic …
WebC and FOZO are commonly occurring sources in ocean island basalts and are thought by some workers to be the signatures of mantle that underwent melt depletion early in the … WebOct 8, 2024 · In this case, mixing between ancient mantle (FOZO) and carbonated, variably altered MORB plus mafic (EM1) ref. 47 to silicic (EM2) ref. 48 metasediment are most likely involved (see also ref. 41). WebThe isotopic characteristics of the alkaline basalts (206 Pb/ 204 Pb = 19.52–19.91; 87 Sr/ 86 Sr = 0.7030–0.7033; 143 Nd/ 144 Nd = 0.5128–0.5130) from the KR1 ST reflect a dominant ‘PREMA (or FOZO)’ mantle component represented by radiogenic Pb and mildly enriched Sr and Nd isotopic compositions. cybertruck 0 60 time