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- W4385830607 abstract "Fogo, Cape Verde, located upon thick oceanic lithosphere provides a window into processes occurring in the mantle where recycled ocean crust in an upwelling mantle plume interacts with ambient mantle. Our objective is to investigate the nature of the lithologies of the mantle sources involved in the petrogenesis of historic volcanic rocks from Fogo. We observe enclaves and mingling textures in the lavas combined with oxygen isotope disequilibrium between olivine and clinopyroxene phenocrysts. Olivine δ18O values display positive correlations with Zr/Hf and Zr/Y and a negative correlation with U/Th, whereas clinopyroxene δ 18O values correlate positively with Ba/Nb. Heterogeneity between crystal populations and within the groundmass indicates that multiple magma batches are mixed beneath Fogo. In terms of mantle endmembers and source lithologies, a HIMU endmember was generated by melting of carbonated eclogite as indicated by low δ 18O, Zr/Hf, Ba/Nb and high U/Th ratios. In contrast we show an EM1 endmember has high δ 18O, Zr/Hf, Ba/Nb and low U/Th ratios, derived from melting of variably carbonated peridotite. Additionally, Ba/Th ratio are high indicating that carbonatite melts have contributed to alkaline magma compositions at Fogo." @default.
- W4385830607 created "2023-08-16" @default.
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- W4385830607 date "2023-11-01" @default.
- W4385830607 modified "2023-10-17" @default.
- W4385830607 title "Disequilibrium in historic volcanic rocks from Fogo, Cape Verde traces carbonatite metasomatism of recycled ocean crust" @default.
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- W4385830607 doi "https://doi.org/10.1016/j.lithos.2023.107328" @default.
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