Reequilibration Processes Occurring in Plagioclase‐Hosted Melt Inclusions From Plagioclase Ultraphyric Basalts
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چکیده
منابع مشابه
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, ...
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متن کاملDetermination of zircon/melt trace element partition coefficients from SIMS analysis of melt inclusions in zircon
Partition coefficients (DM) for rare earth elements (REE) (La, Ce, Nd, Sm, Dy, Er and Yb) and other trace elements (Ba, Rb, B, Sr, Ti, Y and Nb) between zircon and melt have been calculated from secondary ion mass spectrometric (SIMS) analyses of zircon/melt inclusion pairs. The melt inclusion-mineral (MIM) technique shows that DREE increase in compatibility with increasing atomic number, simil...
متن کاملChemical 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 ...
متن کاملMorphology and microstructure of magnetite and ilmenite inclusions in plagioclase from Adirondack anorthositic gneiss
It is well known that oriented iron and titanium oxide inclusions occur in pyroxenes and plagioclase of anorthosites and granulites, and they are attributed to exsolution at subsolidus conditions. The oxides occur as needles or platelets. In this study, we determine the morphology of oxide needles as well as their orientation in plagioclase (An 30–35) in anorthosite gneiss from the Adirondack m...
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ژورنال
عنوان ژورنال: Geochemistry, Geophysics, Geosystems
سال: 2019
ISSN: 1525-2027,1525-2027
DOI: 10.1029/2018gc007795