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Abstract

A Devonian (?) granite complex intrudes
Cambrian (?) volcanics, serpentinised dunite
(olivine Fo,), and siltstones and quartzites of the
Precambrian (?) Oonah Quartzite and Slate and
the Silurian Crotty Quartzite and Amber Slate
Formations. The general trends of these country
rocks are parallel to the granite margins.
The complex is composed of grey, pink and
white granites all with the same mineralogical
composition (quartz, orthoclase dominant, plagioclase
subordinate). The white granite commonly
contains tourmaline nodular segregations, Emplacement
began with the pink and grey granites,
followed closely by the white granite, and finally
the intrusion of minor bodies (porphyritic aplite,
micro-granite, aplite, pegmatite, quartz-tourmaline
dykes, pyroxene dyke) . Tourmaline is abundant
in the later intrusions and is sometimes accompanied
by cassiterite.

Item Type:	Article
Authors/Creators:	Green, TH
Keywords:	Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title:	Papers and Proceedings of the Royal Society of Tasmania
ISSN:	0080-4703
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	Copyright Royal Society of Tasmania
Item Statistics:	View statistics for this item

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