Grain scale processes recorded by oxygen isotopes in olivine-hosted melt inclusions from two MORB samples

Chemical zonation in olivine-hosted melt inclusions

Significant zonation in major, minor, trace, and volatile elements has been documented in naturally glassy olivine-hosted melt inclusions from the Siqueiros Fracture Zone and the Galapagos Islands. Components with a higher concentration in the host olivine than in the melt (e.g., MgO, FeO, Cr2O3, and MnO) are depleted at the edges of the zoned melt inclusions relative to their centers, whereas ...

Variations in Melt Productivity and Melting Conditions along SWIR (708E^498E): Evidence from Olivine-hosted and Plagioclase-hosted Melt Inclusions

Melt inclusion and host glass compositions from the eastern end of the Southwest IndianRidge showaprogressive depletion in light rare earth elements (LREE), Na8 and (La/Sm)n, but an increase in Fe8, from the NE (648E) towards the SW (498E).These changes indicate an increase in the degree of mantle melting towards the SWand correlate with a shallowing of the ridge axial depth and increase in cru...

NanoSIMS results from olivine-hosted melt embayments: Magma ascent rate during explosive basaltic eruptions

Experimental Determination of Spinel / Melt , Olivine / Melt

Introduction Experimental studies have identified spinels as important hosts phases for many of the highly siderophile elements (HSE) [1-4]. Yet experimental studies involving chromite or Cr-rich spinel have been lacking. Experimental studies of partitioning of HSEs between silicate, oxides and silicate melt are plagued by low solubilities and the presence of small metallic nuggets at oxygen fu...

Contamination and melt aggregation processes in continental £ood basalts : constraints from melt inclusions in Oligocene basalts from Yemen

Melt inclusions from Oligocene continental flood basalts (CFB) erupted in Yemen provide unique insight into the timing and nature of the processes that lead to crustal contamination and melt aggregation in CFB magmas. Large variations in trace element indices that are sensitive to the degree and composition of assimilated crustal material (e.g. K2O=0.20^1.94 wt%, Ba= 13^543 ppm, K/Nb=128^1603, ...