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- W2064834605 abstract "Abstract A ternary diagram using MnO, TiO 2 , P 2 O 5 can discriminate between five petrotectonic environments of basaltic rocks (45–54% SiO 2 ). Fields for mid-ocean ridge, island arc tholeiite, island arc calc-alkaline, ocean island tholeiite, and ocean island alkalic rocks were distinguished on the basis of 507 analyses from well-defined environments. Boninites plot within island arc fields. Continental tholeiites, such as the Columbia River basalts, are high in P 2 O 5 relative to MnO and TiO 2 , and overlap portions of all five oceanic fields. MnO is depleted relative to TiO 2 in mid-ocean ridge analyses and may be controlled by early fractionation of olivine and/or clinopyroxene under conditions of low f O 2 . In island arc rocks, MnO is enriched relative to TiO 2 due to early crystallization of titanomagnetite in a high- f O 2 environment. Primitive mid-ocean ridge and arc tholeiites have similar MnO/TiO 2 /P 2 O 5 ratios which indicate a grossly similar parent magma. Increasingly differentiated basaltic rocks are more easily classified by the diagram. High relative abundances of TiO 2 and P 2 O 5 in ocean island rocks are consistent with their derivation from a separate source. Despite the purported high mobility of MnO, the MnO/TiO 2 /P 2 O 5 discriminant diagram may be applied to unspilitized and moderately spilitized zeolite to greenschist facies greenstones with good agreement between the environment determined by MnO/TiO 2 /P 2 O 5 and by other means such as trace elements, REE, or field relations." @default.
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- W2064834605 title "MnO/TiO2/P2O5: a minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogenesis" @default.
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- W2064834605 doi "https://doi.org/10.1016/0012-821x(83)90070-5" @default.
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