Inferences concerning the distribution and composition of pre-Carboniferous rocks in southeastern Tasmania
Leaman, DE (1990) Inferences concerning the distribution and composition of pre-Carboniferous rocks in southeastern Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 124 (1). pp. 1-12. ISSN 0080-4703
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Interpretation of gravity and magnetic data in southeastern Tasmania indicates that blanketing post-Carboniferous rocks
generally lie unconformably on late Precambrian rocks. Supporting evidence is provided by clasts of basement within
overlying pyroclastics and till, and three boreholes.
Near Hobart, west of the Huon River and south of Bruny Island, deep troughs were filled with (?) Cambrian sequences
with a significant volcanic component. Some ultramafics are present along the western margins. Relatively thin wedges
of Ordovician-Devonian rocks are also implied, especially west of the Huon River. All rock-units are comparable with
those exposed in western Tasmania.
The boundary between eastern and western Tasmania terranes occurs near Sorell and granitoids are dominant east of it.
Jurassic dolerite feeder locations have been controlled by basement structure, and doming at Cygnet is related to a thick
syenite intrusion. Many modem topographic, or Tertiary structural patterns may be recognised in deep structures.
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|Keywords:||Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library|
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|Deposited On:||23 May 2012 13:50|
|Last Modified:||27 Jun 2012 11:13|
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