Thermal metamorphism in the trial harbour district, tasmania

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A Devonian granite complex intrudes Precambrian and Silurian siltstones and sandstones as well as (?) Cambrian volcanics and dunite.Metamorphism of the Precambrian sediments is slight, and an andalusite‐bearing, pelitic hornfels is the only characteristic assemblage. The (?) Cambrian volcanics give rise to a variety of assemblages; (1) lime‐ and ferromagnesia‐rich (hypersthene — cummingtonite — labradorite; diopside — hornblende — labradorite); (2) magnesia‐rich (cordierite — hypersthene; cordierite — anthophyllite); (3) ultrabasic (olivine and/or pleonaste). Biotite (or phlogopite) is an almost invariable component, and garnet may also be present in these groups.No significant metamorphism of the dunite is evident; minor development of veins and segregrations of aragonite, magnetite, phlogopite, brucite, chalcedony and antigorite may result from low‐grade hydrothermal activity Metamorphic assemblages in calcareous Silurian siltstones contain garnet, diopside, calcite and epidote.A characteristic feature of the contact metamorphic aureole is the occurrence of diopside‐rich bodies in granite, volcanic hornfels, quartzite and dunite host rocks.

LanguageEnglish
Pages405-418
Number of pages14
JournalJournal of the Geological Society of Australia
Volume13
Issue number2
DOIs
Publication statusPublished - 1 Jan 1966
Externally publishedYes

Fingerprint

dunite
diopside
labradorite
hornfels
harbor
metamorphism
cordierite
phlogopite
siltstone
Silurian
Precambrian
garnet
granite
cummingtonite
anthophyllite
antigorite
chalcedony
brucite
andalusite
aureole

Cite this

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title = "Thermal metamorphism in the trial harbour district, tasmania",
abstract = "A Devonian granite complex intrudes Precambrian and Silurian siltstones and sandstones as well as (?) Cambrian volcanics and dunite.Metamorphism of the Precambrian sediments is slight, and an andalusite‐bearing, pelitic hornfels is the only characteristic assemblage. The (?) Cambrian volcanics give rise to a variety of assemblages; (1) lime‐ and ferromagnesia‐rich (hypersthene — cummingtonite — labradorite; diopside — hornblende — labradorite); (2) magnesia‐rich (cordierite — hypersthene; cordierite — anthophyllite); (3) ultrabasic (olivine and/or pleonaste). Biotite (or phlogopite) is an almost invariable component, and garnet may also be present in these groups.No significant metamorphism of the dunite is evident; minor development of veins and segregrations of aragonite, magnetite, phlogopite, brucite, chalcedony and antigorite may result from low‐grade hydrothermal activity Metamorphic assemblages in calcareous Silurian siltstones contain garnet, diopside, calcite and epidote.A characteristic feature of the contact metamorphic aureole is the occurrence of diopside‐rich bodies in granite, volcanic hornfels, quartzite and dunite host rocks.",
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Thermal metamorphism in the trial harbour district, tasmania. / Green, T. H.

In: Journal of the Geological Society of Australia, Vol. 13, No. 2, 01.01.1966, p. 405-418.

Research output: Contribution to journalArticleResearchpeer-review

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