Early Proterozoic history of the Karari Fault Zone, northwest Gawler Craton, South Australia

Rankin, Leigh R.; Martín, Alexis; Parker, A. J.

doi:10.1080/14400958908527955

Cited by 16 publications

(5 citation statements)

References 10 publications

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“…This area has been named the Fowler Orogenic Belt (Daly et al 1998) and is considered cogenetic with the Karari Fault Zone. A deformed high-grade metamafic rock from the Fowler Orogenic Belt contains metamorphic zircons dated at 1543• by SHRIMP U-Pb techniques (Fanning 1997), and structures in the drill core from the Karari Fault Zone (Rankin et al 1989) and rare outcrop in the Fowler Orogenic Belt are consistent with sinistral transpression and east-side-up dip-slip movement.…”

Section: Gawler Cratonmentioning

confidence: 73%

Proterozoic basement provinces of southern and southwestern Australia, and their correlation with Antarctica

Fitzsimons

2003

288

256

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Three Precambrian basement provinces extend from the southern coast of Australia into East Antarctica when reconstructed in a Gondwana configuration. These are, from east to west, the Mawson Craton, and the Albany-Fraser and Pinjarra Orogens. The Mawson Craton preserves evidence for tectonic activity from the late Archaean until the earliest Mesoproterozoic. It is exposed in the Gawler Craton of South Australia, the Terre Adélie and King George V Land coastline of East Antarctica, and the Miller Range of the central Transantarctic Mountains. It may form a significant part of the ice-covered East Antarctic Shield, although insufficient data are available to constrain its lateral extent. The Mawson Craton underwent late Palaeoproterozoic tectonism along its eastern margin (the Kimban Orogeny) and the occurrence of c. 1700Ma eclogites in the Transantarctic Mountains implies that this was, in part, a collisional event, although elsewhere it was characterized by low P/T metamorphism. The western margin of the Mawson Craton collided with a continental fragment comprising the Nawa Domain of the Gawler Craton, the Coompana Block and the Nornalup Complex of Western Australia at c. 1560Ma during the Kararan Orogeny. The western edge of the Nornalup Complex later collided with the Biranup and Fraser Complexes and Yilgarn Craton to form the Albany-Fraser Orogen during two stages of tectonism at c. 1350–1260 and 1210–1140Ma. The Pinjarra Orogen truncates the western margin of the Yilgarn Craton and Albany-Fraser Orogen, and contains allochthonous 1100–1000Ma gneissic blocks transported along the craton margin during at least two stages of Neoproterozoic transcurrent movement. It divides East Gondwana into Australo-Antarctic and Indo-Antarctic domains, which are distinct continental fragments with different Proterozoic histories that were juxtaposed by oblique collision at 550–500Ma during the assembly of Gondwana. The path taken by the Pinjarra Orogen beneath the Antarctic ice sheet is unknown, but it is of similar width and length to the East African Orogen, and must have been a fundamental Neoproterozoic boundary of critical importance to supercontinent assembly and breakup.

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Section: Gawler Cratonmentioning

confidence: 73%

Proterozoic basement provinces of southern and southwestern Australia, and their correlation with Antarctica

Fitzsimons

2003

288

256

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“…This magnetic response is not consistent with that expected from mafic rocks. The northeast‐trending, highly magnetic, Karari Fault Zone lies in the northwest portion of this domain (Figure 2) (Rankin et al . 1989; Fraser et al .…”

Section: Aeromagnetic Response Of the Central Western Gawler Cratonmentioning

confidence: 99%

Geophysical constraints of shear zones and geometry of the Hiltaba Suite granites in the western Gawler Craton, Australia

McLean

Betts

2003

Australian Journal of Earth Sciences

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The emplacement of the ca 1590-1575 Ma Hiltaba Suite granites records a large magmatic event throughout the Gawler Craton, South Australia. The Hiltaba Suite granites intrude the highly deformed Archaean-Palaeoproterozoic rocks throughout the craton nuclei. Geophysical interpretation of the poorly exposed central western Gawler Craton suggests that the region can be divided into several distinct domains that are bounded by major shear zones, exhibiting a sequence of overprinting relationships. The north-trending Yarlbrinda Shear Zone merges into the east-trending Yerda Shear Zone that, in turn, merges into the northeast-trending Coorabie Shear Zone. Several poorly exposed Hiltaba Suite granite plutons occur within a wide zone of crustal shearing that is bounded to the north by the Yerda Shear Zone and to the south by the Oolabinnia Shear Zone. This wide zone of crustal shearing is interpreted as a major zone of synmagmatic dextral strike-slip movement that facilitated the ascent of Hiltaba Suite granite intrusions to the upper crust. The aeromagnetic and gravity data reveal that the intrusions are ~ 15-25 km in diameter. Forward modelling of the geophysical data shows that the intrusions have a tabular geometry and are less than 6 km deep.

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“…Given the pressure estimates discussed above, thrusting was responsible for at least *3 kbar or *10 km of vertical offset, exhuming the terranes north of the Karari Shear Zone (Figure 8). Fraser & Lyons (2006) Map patterns in regional magnetic images, and previous field observations ( Rankin et al 1989;Betts & Giles 2002;Direen et al 2005;Swain et al 2005a;Stewart & Betts 2010) have been interpreted to infer significant sinistral strike-slip motion across the Karari Shear Zone. Although some of this strike-slip motion may have occurred in concert with thrust motion in the interval ca 1580 to 1550 Ma, a distinct subsequent episode of strike-slip shearing is interpreted to have occurred at ca 1450-1440 Ma, based on the consistency of 40 Ar/ 39 Ar mica ages from hydrous shear fabrics within the Karari Shear Zone, and that these ages post-date 40 Ar/ 39 Ar ages from both south and north of the shear zone (Fraser & Lyons 2006;this study).…”

Section: Regional Implications and Discussionmentioning

confidence: 91%

“…Sample locations and drill holes from which samples were taken are shown on Figure 2 and in Tables The drill-hole Ooldea DDH3 was located directly over the magnetic trace of the Karari Shear Zone and rocks from this drill-hole represent the only available samples from within the shear zone (Rankin et al 1989), which is not exposed anywhere along its length. Sample 2007371003a is a strongly mylonitic garnet-quartz-plagioclase-K-feldspar-magnetite gneiss.…”

Section: Resultsmentioning

confidence: 99%

“…The most prominent of these is the Karari Shear Zone (Rankin et al 1989), which spans at least *400 km in an arcuate north to north-east orientation, and truncates the regional structural grain evident in magnetic images ( Figure 2). The Karari Shear Zone defines the boundary between the Christie Domain to the south and east, composed of Mulgathing Complex gneisses, and the Nawa Domain to the north and west.…”

Section: Geological Settingmentioning

confidence: 98%

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Timing of deformation and exhumation across the Karari Shear Zone, north-western Gawler Craton, South Australia

Fraser

Reid²,

Stern

2012

Australian Journal of Earth Sciences

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In the north-western Gawler Craton of South Australia, the Karari Shear Zone defines a boundary between late-Archean to earliest Paleoproterozoic rocks, which have remained largely undisturbed since the earliest Paleoproterozoic, and younger Paleoproterozoic rocks that have been reworked through multiple late Paleoproterozoic and Mesoproterozoic metamorphic and deformation events. The history of movement across the Karari Shear Zone has been investigated via new U-Pb and 40 Ar/ 39 Ar geochronology, in combination with pre-existing geochronological and metamorphic constraints, as well as the structural geometry revealed by a recently acquired reflection seismic transect. The available data suggest a complex history of shear-zone movement in at least four stages, with contrasting sense of motion at different times. The first period of movement across the Karari Shear Zone is inferred to have been a period of extension at ca 1750-1720 Ma. This was likely closely followed by reactivation during the Kimban Orogeny between ca 1720 and 1680 Ma, although the sense of movement during this period is unclear. Further reactivation, in a thrust sense, occurred between ca 1580 and 1560 Ma, resulting in significant exhumation of marginal domains of the Gawler Craton to the north of the Karari Shear Zone. A final episode of largely strike-slip shear-zone movement occurred at ca 1450 Ma.

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Early Proterozoic history of the Karari Fault Zone, northwest Gawler Craton, South Australia

Cited by 16 publications

References 10 publications

Proterozoic basement provinces of southern and southwestern Australia, and their correlation with Antarctica

Proterozoic basement provinces of southern and southwestern Australia, and their correlation with Antarctica

Geophysical constraints of shear zones and geometry of the Hiltaba Suite granites in the western Gawler Craton, Australia

Timing of deformation and exhumation across the Karari Shear Zone, north-western Gawler Craton, South Australia

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