Stratigraphic and structural relationships and evidence for Cambrian deformation at the western margin of the Mt Read Volcanics, Tasmania
作者:
K. D. Corbett,
T. C. Lees,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1987)
卷期:
Volume 34,
issue 1
页码: 45-67
ISSN:0812-0099
年代: 1987
DOI:10.1080/08120098708729393
出版商: Taylor & Francis Group
关键词: Mt Read Volcanics;western Tasmania;Dundas Trough;Cambrian;forearc;accretionary complex;Henty Fault
数据来源: Taylor
摘要:
Detailed geological mapping and drilling has shown that the contact between the Cambrian volcano‐sedimentary sequence at Rosebery and the Mt Read Volcanics is formed by a major thrust fault dipping east at 40° and having a displacement of at least 1.5 km. The sedimentary sequence is part of the Dundas Group, a Middle to Late Cambrian forearc‐like sequence which unconformably overlaps the volcanics south of Rosebery. The Rosebery Thrust Fault marks the eastern boundary of a zone of folding, faulting and disruption which affects the Dundas Group and the tectonically interfingered and underlying basaltic greywacke‐mudstone sequence of the Crimson Creek Formation. At least some of this deformation occurred prior to deposition of the Ordovician Limestone, as evidenced by marked angular discordances. The complex area can be interpreted as a Cambrian accretionary prism‐forearc‐arc sequence developed above an east‐dipping subduction zone.
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