The Geochemistry and Experimental Petrology of Sodic Alkaline Basalts from Oatlands, Tasmania

1 December 1990

journal article
Published by Oxford University Press (OUP) in Journal of Petrology

Vol. 31 (6) , 1201-1223
https://doi.org/10.1093/petrology/31.6.1201

Abstract

Sodic basalts of Oligocene-Early Micene age occur within an Early Tertiary graben in the Oatlands district of Tasmania. They include olivine tholeiites, alkali olivine basalts, basanites, transitional nephelinites, nepheline hawaiites, and nepheline mugearites. They have compositional characteristics in common with sodic alkaline basalt suites from other parts of the world. With decreasing SiO₂, concentrations of CaO, alkalis, P₂O₅, and incompatible trace elements increase.

Keywords

OATLANDS
SODIC
BASALTS
OLIVINE
NEPHELINE
MICENE
BASANITES
EXPERIMENTAL
GEOCHEMISTRY
HAWAIITES

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