Experimental determination of activities in FeTiO3-MnTiO3 ilmenite solid solution by redox reversals

Article Abstract:

Analysis of synthesized Fe-Mn ilmenite by electron microprobe (EMP) shows that a synthesis duration of greater than or about 100 hours produces homogenous ilmenite. Run durations of 2-5 days with intermediate grindings are sufficient to produce 100% ilmenite of good crystallinity. Shorter run durations can produce additional traces of rutile and MnO. The ilmenite shows ideal stoichiometry with (Fe-Mn) = Ti = 1, when normalized to 3 oxygens.

Ilmenite

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Geochemical reversals within the lower 100 m of the Palisades sill, New Jersey

Article Abstract:

Petrographic and geochemical data obtained from Palisades sill at Fort Lee, New Jersey, indicate that olivine zone (OZ) may have formed due to initial emplacement of a heterogenous initial magma. The magma originated from a compositionally stratified, sub-Palisades storage chamber situated inside the upper crust. Heterogenity came into existence either directly from the mantle or during quick ascent.

Observations, Natural history, Analytic geochemistry, Palisades

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Complex zoning between super-calcic pigeonite and augite from the Graveyard Point sill, Oregon: a record of the interplay between bulk and interstitial liquid fractionation

Article Abstract:

An analysis of minerals from the Snake River Plain region in Oregon indicates that olivine assists in the transformation of augite to super-calcic pigeonite. The authors compare the fractional crystallization processes of bulk liquid and interstitial melt, and discuss the two processes' influence on mineral texture and chemistry.

Oregon, Statistical Data Included, Research, Composition, Crystallization, Olivine, Silicate minerals, Fractionation, Fractional distillation

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