New constraints on source location and emplacement mechanisms of extensive felsic units in the Gawler Range Volcanics, South Australia

Jocelyn McPhie; Fernando DellaPasqua; Sharon Allen; Mark Lackie

doi:10.1071/ASEG2006ab109

ISSN: 2202-0586
E-ISSN:

oa New constraints on source location and emplacement mechanisms of extensive felsic units in the Gawler Range Volcanics, South Australia
Authors Jocelyn McPhie^a, Fernando DellaPasqua^a, Sharon Allen^a and Mark Lackie^b
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^a School of Earth Sciences and CODESUniversity of Tasmania, Hobart, , Tasmania, [email protected] ^b Department of Earth and Planetary Sciences, Macquarie University, North Ryde, , New South Wales, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2006ab109
- Published online: 01 Dec 2006

Abstract

Eucairo Rhyolite is one of three voluminous (>675 km³) units in the upper part of the Gawler Range Volcanics. Eight stratigraphic sections through the Eucarro Rhyolite were sampled for anisotropy of magnetic susceptibility (AMS). The unit has AMS characteristics similar to those of lavas. AMS foliations (Kmax/Kint plane) consistently strike northwest and are very steeply dipping. Seven sections show a change from steep southwesterly dips near the base to vertical or northeasterly dips in the middle and near the top. Furthermore, the AMS pattern implies outflow from a source located to the southwest of present outcrops. In the remaining section, the AMS pattern implies outflow from the northeast. The opposing flow directions may be delineating the boundary between adjacent lava flow lobes. This study suggests that felsic lavas can have dimensions comparable with those of mafic lavas.

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2006-12-01

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References

Allen S A and McPhie J 2002 The Eucarro Rhyolite, Gawler Range Volcanics, South Australia: A >675 km3, compositionally zoned lava of Mesoproterozoic age. Geol Soc Amer Bull 114 1592-1609
Allen S A Simpson C and J McPhie J Daly S J 2003 Stratigraphy, distribution and geochemistry of widespread felsic volcanic units in the Mesoproterozoic Gawler Range Volcanics, South Australia. Aust J Earth Sci 50 97-112
Canñon-Tapia E and H Pinkerton 2000 The anisotropy and magnetic susceptibility of lava flows: an experimental approach. J Vole Geotherm Res 98 219-233
Canñon-Tapia E Walker J P L and Herrero-Bervera E 1997 The internal structure of lava flows – insights from AMS measurements II: Hawaiian pahoehoe, toothpaste lava and a’a. J Vole Geotherm Res 76 19-46
Constable C and Tauxe L 1990 The bootstrap for magnetic susceptibility tensors. J Geophys Res 95: 8383-8395
Garner A and McPhie J 1999 Partially melted lithic megablocks in the Yardea Dacite, Gawler Range Volcanics, Australia: implications for eruption and emplacement mechanisms. Bull Vole 61 396-410
Morrow N and McPhie J 2000 Mingled silicic lavas in the Mesoproterozoic Gawler Range Volcanics, South Australia. J Volc Geotherm Res 96 1-13
Tauxe L 1998 Paleomagnetic principles and practice. Kluwer Academic Publishers, Dordrecht, The Netherlands, 299 pp
Walker GPL Canñon-Tapia E Herrero-Bervera E 1999 Origin of vesicle layering and double imbrication by endogenous growth in the Birkett basalt flow (Columbia River Plateau). J Vole Geotherm Res 88 15-28

/content/journals/10.1071/ASEG2006ab109

Article Type: Research Article

Keyword(s): AMS; Eucarro Rhyolite; felsic lava; Gawler Range Volcanics; Mesoproterozoic

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oa New constraints on source location and emplacement mechanisms of extensive felsic units in the Gawler Range Volcanics, South Australia

Abstract

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