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Crustal architecture during the early Mesoproterozoic Hiltaba-related mineralisation event: are the Gawler Range Volcanics a foreland basin fill?

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Hand, MP and Reid, AJ and Szpunar, MA and Direen, NG and Wade, B and Payne, J and Barovich, KM (2008) Crustal architecture during the early Mesoproterozoic Hiltaba-related mineralisation event: are the Gawler Range Volcanics a foreland basin fill? MESA Journal, 51. pp. 19-24. ISSN 1326-3544

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Abstract

The tectonic setting of Hiltaba Suite
(1595–1575 Ma) magmatism within
the Gawler Craton has long been
regarded as anorogenic, accompanied
by mild extension (Flint et al. 1993;
Creaser 1995). This evaluation was
largely based on the apparently limited
deformation recorded within the Hiltaba
Suite and Gawler Range Volcanics,
their enriched geochemical signature
and the high-temperature nature of
magmatism. However, there is now
growing evidence that contractional
fault reactivation, metamorphism and
locally pervasive deformation were
associated with the emplacement of the
Hiltaba Suite and the associated iron
oxide – copper–gold (IOCG) ± uranium
and gold mineral systems, suggesting
the existence of a compressional regime
in the early Mesoproterozoic Gawler
Craton. In this contribution, we briefly
summarise evidence for crustal-scale
early Mesoproterozoic deformation
in the Gawler Craton and suggest it
forms part of a broader system that
incorporates the Olarian Orogeny of
the Curnamona Province. In the light
of the new data on the spatial nature
of early Mesoproterozoic deformation
and metamorphism across southern
Australian Proterozoic terranes (Fig. 1),
we suggest that the Gawler Range and
Benagerie volcanics are an unusual
volcanic-fill within a foreland basin
that formed within a broadly NW–SEdirected
compressional regime.

Item Type: Article
Journal or Publication Title: MESA Journal
Page Range: pp. 19-24
ISSN: 1326-3544
Additional Information:

Copyright © PIRSA

Date Deposited: 06 Sep 2010 06:39
Last Modified: 29 Apr 2011 06:44
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