The nature of the basement to the Kimberley Block, Northwestern Australia

Gunn, Peter; Meixner, A.J.

doi:10.1071/eg998506

Cited by 26 publications

(14 citation statements)

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“…Figure 2 shows large-scale features (heavy black lines) that were identified through interpretation, or supported through previous studies (e.g. Tyler et al 1995;Gunn and Meixner, 1998). Notably, the intersection of these features coincides with complex structures.…”

Section: Methods and Resultssupporting

confidence: 59%

“…1a). The eastern part of the Lamboo Province, known as the Halls Creek Orogen, is inferred to be a series of northeasterly-trending Archean and Paleoproterozoic terranes (Gunn and Meixner, 1998;Hollis et al, 2014 (Blake et al, 2000). The central zone is characterised by the Tickalara Metamorphics, a metamorphosed group of lithologies attributed to an ocean arc formed during the Hooper Orogeny, and the felsic to mafic intrusive rocks of the 1832-1808 Ma Sally Downs Supersuite, emplaced during the Halls Creek Orogeny (Sheppard et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Integrated interpretation of magnetotelluric and potential field data: assessing the northeast Kimberley region

Lindsay¹,

Spratt²,

Occhipinti³

et al. 2016

ASEG Extended Abstracts

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SUMMARYAn integrated interpretation of potential field and magnetotelluric (MT) data was performed in the east Kimberley, northern Western Australia Structural interpretation of potential field data was constrained by geological field observations, petrophysics, remotesensing and an understanding of the tectonic history of the region. Forward modelling of the potential field data located along the same survey traverse as the magnetotelluric data allowed comparison between the two datasets to assess complementarity of images and assist interpretation. Interpreted features include the presence of large-scale structures and associated electrical anomalies that indicate the presence of mineralisation deep in the crust, and guide prediction of mineralisation at or near the surface. The King River Fault is revealed to be a crustal-scale, west-dipping structure, which footwall bounds the western side of a large resistive body. A conductive anomaly is also located on the hanging wall of the King River Fault. A number of scenarios are discussed to the source of conductivity, including the presence of sulphides, saline water and graphite. Our assessment suggests that graphitic rocks, most likely with some sulphide content, contribute to the strength of this anomaly, and highlights the known potential of the east Kimberley to host graphite deposits. The conductive anomaly has a spatial and geometric correlation to Speewah Dome, a known prospective region. The depth of the conductor (c. 5km) precludes mining, but does indicate King River Fault is likely to form a mineralising conduit, and may contribute to possible Pb-Zn mineralisation where the fault reaches the surface.

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Section: Methods and Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Integrated interpretation of magnetotelluric and potential field data: assessing the northeast Kimberley region

Lindsay¹,

Spratt²,

Occhipinti³

et al. 2016

ASEG Extended Abstracts

View full text Add to dashboard Cite

show abstract

“…However, within the basement, a conjugate Proterozoic dyke-filled fracture system extends out from the onshore Kimberley Block (Etheridge and Wall, 1994;O'Brien et al, 1996). These fracture systems have controlled present-day topography in the onshore Kimberley Ranges (Gunn and Meixner, 1998). They are imaged as a conjugate Fig.…”

Section: Aeromagnetic Anomaliesmentioning

confidence: 96%

Characterisation and correlation of active hydrocarbon seepage using geophysical data sets: An example from the tropical, carbonate Yampi Shelf, Northwest Australia

Rollet

Logan

Kennard

et al. 2006

Marine and Petroleum Geology

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“…The dyke has discontinuous exposure, but is traceable for at least 200 km, trends to the northwest and is best observed near Bell Gorge on the Gibb River Road (Griffin et al 1993). Magnetic data (Gunn & Meixner 1998) show that the Milliwindi dyke extends at least 70 km offshore at Collier Bay, north of Derby. The Milliwindi dyke is positively magnetised, similar to a number of other northwest‐trending dykes that cut sedimentary rocks of the Kimberley Basin (Gunn & Meixner 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic data (Gunn & Meixner 1998) show that the Milliwindi dyke extends at least 70 km offshore at Collier Bay, north of Derby. The Milliwindi dyke is positively magnetised, similar to a number of other northwest‐trending dykes that cut sedimentary rocks of the Kimberley Basin (Gunn & Meixner 1998). Sample MWD1 was obtained from a fresh surface exposure of the Milliwindi dyke where it is cut by the Lennard River (GR 746500E, 8100100N).…”

Section: Introductionmentioning

confidence: 99%

SHRIMP zircon age for an Early Cambrian dolerite dyke: An intrusive phase of the Antrim Plateau Volcanics of northern Australia

Hanley

Wingate

2000

Australian Journal of Earth Sciences

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The Antrim Plateau Volcanics, Australia’s largest Phanerozoic flood‐basalt province, originally covered an area of at least 300 000 km2 across northern Australia. Stratigraphic constraints indicate that the Antrim Plateau Volcanics are of Early Cambrian age (ca 545–509 Ma), although previous attempts to date the Antrim basalts by radiometric methods have been inconclusive. We present an ion microprobe U–Pb zircon age of 513 ± 12 Ma for the ∼250 km‐long Milliwindi dolerite dyke in the west Kimberley. The dolerite is geochemically identical to basalts of the Antrim Plateau Volcanics, and was probably a feeder dyke for basalts that have since been eroded. It is suggested that the Antrim Plateau Volcanics extended hundreds of kilometres further to the west than recognised previously and may have once covered part of the Kimberley block.

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The nature of the basement to the Kimberley Block, Northwestern Australia

Cited by 26 publications

References 0 publications

Integrated interpretation of magnetotelluric and potential field data: assessing the northeast Kimberley region

Integrated interpretation of magnetotelluric and potential field data: assessing the northeast Kimberley region

Characterisation and correlation of active hydrocarbon seepage using geophysical data sets: An example from the tropical, carbonate Yampi Shelf, Northwest Australia

SHRIMP zircon age for an Early Cambrian dolerite dyke: An intrusive phase of the Antrim Plateau Volcanics of northern Australia

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