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Pyroxenes in altered volcanic rocks, Glenrock Station, NSW, Australia

Published online by Cambridge University Press:  05 July 2018

R. Offler
R. Offler*
Affiliation:
Department of Geology, The University of Newcastle, NSW, Australia 2308
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Summary

Microprobe analyses of relict pyroxenes in meta-basalts from thrust slices of the Peel fault zone, Glenrock Station, NSW, demonstrate that the majority of these rocks have a tholeiitic affinity. Those of Ordovician to L. Devonian(?) age in the upper thrust slices show a greater Fe-enrichment, and lower wollastonite, Al and Ti contents than their Devonian counterparts in the lowest thrust sheet. The pyroxene data also indicate that some rocks are geochemically transitional between tholeiitic and alkaline magmas. The relict pyroxenes in metadolerites emplaced in the Devonian sequence show that these rocks are transitional to tholeiitic in character and that they appear not to be consanguineous with the metabasalts.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 328 , December 1979 , pp. 497 - 503
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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