Volcanic greywackes from the upper Devonian baldwin formation, Tamworth‐Barraba district, New South Wales

B. W. Chappell

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The Baldwin Formation consists of interbedded greywackes and mudstones deposited in the New England Eugeosyncline during Late Devonian times. The greywackes consist essentially of andesitic detritus and they may be termed volcanic greywackes. They contain very little detrital quartz or sedimentary rock fragments. Chemical analyses of ten greywackes are presented. These show that the greywackes have an andesitic composition, differing only in their relatively high sodium contents. The high sodium values may be due to reaction between the detritus and sea water. Burial metamorphism of the greywackes has produced minerals characteristic of the prehnite‐pumpellyite metagreywacke facies. Secondary minerals include albite, chlorite, calcite, prehnite, pumpellyite and epidote.

LanguageEnglish
Pages87-102
Number of pages16
JournalJournal of the Geological Society of Australia
Volume15
Issue number1
DOIs
Publication statusPublished - 1 Jan 1968

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pumpellyite
prehnite
detritus
metagreywacke
sodium
secondary mineral
epidote
albite
mudstone
chlorite
sedimentary rock
metamorphism
calcite
quartz
seawater
mineral
chemical

Cite this

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Volcanic greywackes from the upper Devonian baldwin formation, Tamworth‐Barraba district, New South Wales. / Chappell, B. W.

In: Journal of the Geological Society of Australia, Vol. 15, No. 1, 01.01.1968, p. 87-102.

Research output: Contribution to journalArticleResearchpeer-review

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