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- W2063056121 abstract "Optical examination of the opaque oxide minerals in specimens of diabase, intermediategranophyric diabase, granophyre, and diabase pegmatite from Triassic intrusionsof Pennsylvania revealed distinct changes through the diabase-granophyre differentiationsequence. Qualitative electron microprobe scans across complex mineral grains supplementedand confirmed the optical interpretations. The opaque oxide minerals consistalmost entirely of ilmenite, magnetite, and ulvospinel, and they comprise between 1 and10 percent of the rocks in the diabase-granophyre sequence. Magnetite occurs in twoforms: the first contains exsolved ulvospinel and is intimately associated with ilmenite;the second is Ti-poor and it does not contain microscopically visible Ti-bearing phases.The second form occurs as rims on the first or as separate crystals in differentiatedrocks. Ilmenite occurs as intergrowths, as skeletal growths, and as individual crystals.Accompanying the igneous differentiation sequence there is a gradation from titaniferousmagnetite with ilmenite, to skeletal ilmenite retaining an original spinel outline. Wesuggest that during the stage of iron-enrichment in the igneous differentiation sequencean aqueous fluid developed within the crystallizing intermediate magma and was capableof dissolving iron from the titaniferous magnetite intergrowths, leaving skeletal crystalsof ilmenite. Some or all of this iron was redeposited as a second generation of Ti-poormagnetite within the source rock. It is possible that iron-bearing solutions so derivedcould escape to higher levels where they would be a potential source of magnetitedeposits of Cornwall type." @default.
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- W2063056121 date "1968-12-01" @default.
- W2063056121 modified "2023-10-17" @default.
- W2063056121 title "Opaque oxide minerals of some diabase-granophyre associations in Pennsylvania" @default.
- W2063056121 doi "https://doi.org/10.2113/gsecongeo.63.8.950" @default.
- W2063056121 hasPublicationYear "1968" @default.
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