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TiO2 Content and the Shoshonite and Alkaline Associations

Nature Physical Science volume 236, pages 110–111 (1972)Cite this article

Abstract

THERE are two distinct genetically unrelated “alkaline” magma series. First, there is the alkaline association proper which occurs on oceanic islands, continental margins and continental rift systems. Second, there is the characteristically potassic shoshonite association1, which typically appears in the later stages of island arc evolution2. Basaltic members lie in the alkaline field on the diagram of Na2O+K2O against SiO2, above the Macdonald–Katsura line, but are never strongly nepheline normative.

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Authors and Affiliations

  1. Geology Department, Australian National University, Canberra, ACT

    S. E. KESSON & I. E. SMITH

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  1. S. E. KESSON
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  2. I. E. SMITH
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KESSON, S., SMITH, I. TiO2 Content and the Shoshonite and Alkaline Associations. Nature Physical Science 236, 110–111 (1972). https://doi.org/10.1038/physci236110c0

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