Neoproterozoic and Cretaceous mantle oxidation states: Controls and heterogeneity through time
作者： Rabea A.M. Ali , Ayman E. Maurice , Iain K. Pitcairn , Ahmed H. Ahmed , Mokhles K. Azer
DOI: 10.1016/J.LITHOS.2020.105375
关键词: Olivine 、 Mineral redox buffer 、 Proterozoic 、 Precambrian 、 Geology 、 Spinel 、 Forearc 、 Mantle (geology) 、 Chromitite 、 Geochemistry
摘要: Abstract To estimate the oxygen fugacity (fO2) of Neoproterozoic and Cretaceous suprasubduction zone mantle, to evaluate possible secular changes in upper mantle oxidation state, compositions spinel, olivine orthopyroxene (Egypt Saudi Arabia) late (Iran) rocks were determined. For accurate estimation fO2, spinel ferric iron was calculated after correcting electron microprobe data using a set standards for which content measured by Mӧssbauer spectroscopy. The samples record strongly heterogenous fO2 values ranging from moderately oxidized (FMQ +0.54) ultra-reduced -4.73) harzburgites, highly +1.49) reduced -0.60) dunites as well one -1.61) value chromitite. Such heterogeneity is not apparent harzburgites that slightly +0.45) -0.85). forearc most easily explained melt-mantle interaction deep-mantle recycling, while can be attributed variable degrees interaction. estimated Neoproterozoic/Cretaceous unaffected melt-rock published Precambrian Modern suggest consistent state Proterozoic present day.
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