Stratigraphic and structural relationships and evidence for Cambrian deformation at the western margin of the Mt Read Volcanics, Tasmania

Corbett, K. D.; Lees, T. C.

doi:10.1080/08120098708729393

Cited by 30 publications

(20 citation statements)

References 21 publications

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“…The lithostratigraphy of the Mount Read Volcanics is disrupted by a major Cambrian fault zone, the Henty Fault ( Fig. 1) (Berry, 1989), and the succession has been faulted and folded mainly during the Early to Middle Devonian (Corbett and Lees, 1987;Crawford and Berry, 1992). Regional metamorphism to greenschist facies accompanied Devonian deformation (Green et al, 1981;Walshe and Solomon, 1981;Corbett and Solomon, 1989).…”

Section: Geological Settingmentioning

confidence: 99%

“…1). The Mount Read Volcanics crop out in a 200U20 km area and are dominated by submarine, calc-alkaline volcanic and sedimentary rocks (Corbett and Lees, 1987;Corbett, 1992). The lithostratigraphic units comprise compositionally and texturally diverse volcanic and non-volcanic sedimentary facies.…”

Section: Geological Settingmentioning

confidence: 99%

“…2) (Braithwaite, 1974;Corbett and Lees, 1987;Lees, 1987;Corbett and Solomon, 1989;Allen and Cas, 1990;Allen and Hunns, 1990;Allen, 1994a,b). Bedforms and textures within the volcaniclastic units are consistent with deposition from turbidity currents, debris £ows and suspension in a below-wave-base submarine environment.…”

Section: Geological Settingmentioning

confidence: 99%

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Pumiceous rhyolitic peperite in ancient submarine volcanic successions

Gifkins

McPhie

Allen

2002

Journal of Volcanology and Geothermal Research

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Pumiceous peperite is associated with a rhyolitic sill that intruded wet, unconsolidated, submarine stratified pumice breccia in the Cambrian Mount Read Volcanics, Australia. Other examples of pumiceous peperite described in this paper occur at the pumiceous base of a rhyolitic lava and the margins of a rhyolitic cryptodome complex in the Miocene Green Tuff Belt, Japan. Intervals of pumiceous peperite are thin ( 6 15 m), laterally discontinuous, massive, poorly sorted and the clast-to-matrix ratio varies significantly over short distances. They are composed of feldsparphyric tube pumice clasts and domains of clastic sediment that include stratified pumice breccia, pumiceous siltstone and bioturbated mudstone. The sediment domains may be massive or may display relic depositional structures. Sediment adjacent to pumice clasts is silicified, possibly reflecting induration on contact with hot pumice. Pumiceous peperite has gradational contacts with in situ and clast-rotated pumiceous hyaloclastite and coherent pumiceous rhyolite. Gradational relationships between pumiceous peperite and coherent pumiceous rhyolite, pumice clasts with chilled margins and curviplanar surfaces, and abundant jigsaw-fit texture imply that quench fragmentation and autobrecciation were the dominant mechanisms of clast formation. The formation of pumiceous peperite is favoured by a combination of low confining pressure and delayed quenching allowing vesiculation. Pumiceous peperite may easily be misinterpreted or overlooked as it resembles other pumice-rich facies that are common in submarine volcanic successions. The correct identification of pumiceous peperite can provide evidence to constrain the timing of intrusive episodes in volcanic successions. ß

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Pumiceous rhyolitic peperite in ancient submarine volcanic successions

Gifkins

McPhie

Allen

2002

Journal of Volcanology and Geothermal Research

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“…Previous interpretations and summaries have been given by Corbett (1981) and Corbett and Lees (1987).…”

Section: • 1 Simp]ified Geologic M•p Showing Present Distribution Omentioning

confidence: 96%

Stratigraphic-volcanic setting of massive sulfide deposits in the Cambrian Mount Read Volcanics, Tasmania

Corbett¹

1992

Economic Geology

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The Cambrian Mount Read Volcanics of western Tasmania host the volcanic-hosted massive sulfide (VHMS) deposits at Hellyer, Que River, Rosebery, Hercules, and Mount Lyell. The volcanics were erupted along, and partly onto, the western margin of a Precambrian basement terrane now represented by the Tyennan region. The volcanic belt is asymmetrical in section, with a main eastern zone of relatively massive lava-rich sequences, accompanied by abundant intrusions and a broader western zone of volcano-sedimentary sequences rich in volcaniclastic mass-flow sandstone and breccia. The rocks have been strongly deformed, regionally metamorphosed to lower greenschist facies, and hydrothermally altered in many areas.Stratigraphic and facies relationships within the highly complex volcanic belt are critically reviewed and reassessed. The main volcanic zone is considered to comprise two interfingering lava-rich associations: the quartz-feldspar-porphyritic Eastern sequence and the largely feldspar-porphyritic Central Volcanic Complex. This lava-rich zone interfingers with the western volcano-sedimentary sequences, herein referred to as: the Yolande River sequence, the Dundas Group, and the Mount Charter Group (new term). Recent volcanologic studies indicate that the lava-rich sequences, and indeed the bulk of the preserved Mount Read Volcanics, are submarine in character, despite the presence of abundant ignimbritelike pumiceous deposits.The early volcanism was predominantly rhyolitic-dacitic in composition but was followed by a period of active andesitic-basaltic volcanism during which the massive sulfide deposits at Hellyer and Que River, and some of those at Mount Lyell, were formed. This widespread andesitic-basaltic volcanism appears to coincide with a period of active extension and rifting along the belt, focused to some extent on the Henty fault system. The rifting episode is •videnced by abundant tholeiitic dikes along the Henty fault and throughout the northern Central Volcanic Complex and by tholeiitic pillow lavas within the Henty fault wedge.The andesitic-basaltic volcanism appears to have culminated in distinctive P205 and light rare earth element (LREE)-enriched basalts at Hellyer, and similar rocks at Lynch Creek and Howards Plains near Queenstown may be correlates. The Hellyer basalts were buried by black shale, and the final volcanic phase was marked by a return to active felsic volcanism which produced widespread crystal-and pumice-rich mass-flow deposits of the Southwell Subgroup and Tyndall Group.

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“…Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. Corbett and Lees (1987) are to be congratulated for their descriptive work on the geology of the Rosebery atea, and particularly their outstanding contribution in delimiting the various rock-units within the metalliferous ore-rich Mt Read Volcanics in western Tasmania. However, since they did not make a clear distinction between Devonian cleavage-associated folds and those believed to be of Cambrian age their structural evaluations are rather speculative (cf.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%