Foliation-boudinage control on the formation of the Rosebery Pb-Zn orebody, Tasmania

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doi: 10.1016/0191-8141(91)90002-Z
Authors:Aerden, Domingo G. A. M.
Author Affiliations:Primary:
James Cook Univ. North Queensl., Dep. Geol., Townsville, Queensl., Australia
Volume Title:Journal of Structural Geology
Source:Journal of Structural Geology, 13(7), p.759-775. Publisher: Pergamon, Oxford-New York, International. ISSN: 0191-8141
Publication Date:1991
Note:In English. 56 refs.; illus. incl. 2 plates, geol. sketch map
Summary:The Rosebery Pb-Zn-Ag-Au massive sulphide deposit occurs within the Middle Cambrian Mt Read volcanics of W Tasmania. The mineralization is generally parallel to the dominant external cleavage, but discordant to folds in the host rock. This conflicts with previous volcanogenic interpretations of the orebody, as a conformable sediment layer. During deformation, reverse shearing along the Rosebery fault caused intensification and extension of the foliation and the formation of anastomosing shear-planes associated with foliation boudinage. Material transport was channelled through the Rosebery fault zone. Gaping of extensional ramps caused fracturing and brecciation of the wall rock, infiltration of the hydrothermal fluids and replacement of the host rock by sulphides and silicates. The hydrothermal fluids potentially derived their metals and sulphur from disseminated primary sulphides in the footwall volcanics of the deposit. [J.M.H.]
Subjects:Boudinage; Deformation; Economic geology; Extension tectonics; Faults; Foliation; Geometry; Interpretation; Lead-zinc deposits; Lineation; Metal ores; Mineral deposits, genesis; Structural analysis; Structural controls; Structural geology; Tectonics; Thrust faults; Zoning; Australasia; Australia; Rosebery Australia; Tasmania Australia; Western Tasmania
Abstract Numbers:92M/1474
Record ID:1991047425
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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