Terranes of the Wonominta block, far western New South Wales

Leitch, E. C.; Webby, Barry D.; Mills, K. J.; Kolbe, P.

doi:10.1029/gd019p0031

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…Previous geological studies of the area were by Brunker and O’Connell (1967), Wilson (1967), Brunker et al (1971), Leitch et al (1987), Mills (1992) and Crawford et al (1997): however, detailed investigations of the Ordovician Yandaminta Quartzite, Rowena Formation and younger Ravendale Formation have not been undertaken previously. Evans (1977) and Neef and Larsen (2000) discovered fold trends indicating sinistral and dextral faulting and deformation of Devonian strata of western New South Wales.…”

Section: Introductionmentioning

confidence: 98%

Stratigraphy, structure and tectonics of Lower Ordovician and Devonian strata of the central part of the Wonominta Block, western New South Wales

Neef¹,

Bottrill²

2001

Australian Journal of Earth Sciences

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Cover strata of the 40 km‐wide north‐northwest‐trending Wonominta Block are sandstone‐dominated and Palaeozoic in age. The block is bounded by the Koonenberry and Mootwingee Faults, and cut by the Mt Wright Fault, and it has a basement of mildly metamorphosed and deformed siliciclastic Neoproterozoic and Lower Cambrian rocks. The cover strata of the block, mostly well‐sorted quartz arenites to arkoses, are represented by: (i) the Lower Ordovician Yandaminta (marine) and Rowena Formations (mostly non‐marine), which in the north form a shoreline of an Ordovician island (Wertago Island); (ii) the Middle Devonian, Snake Cave Sandstone (Emsian–Eifelian) and Waverley Creek beds (Givetian), and the largely Upper Devonian Ravendale Formation. On Koonawarra Station the Ravendale Formation has lower (Upper Givetian – Frasnian?) and upper (Famennian?) parts, which are separated by a local unconformity and were deposited mainly by braided streams. The arcuate, northwest‐trending Koonawarra Syncline formed during northeast–southwest compression. Its growth commenced prior to the Givetian (Middle Devonian) and continued during the Late Devonian (?late Frasnian), post‐dating the deposition of the lower part of the Ravendale Formation. The fold was subsequently truncated by erosion, which was followed in the ?Famennian by the deposition of the upper Ravendale Formation, preserved in the core of the Mt Lynn Syncline (which refolds the Koonawarra Syncline). The Mt Lynn Syncline was cut by the Mt Wright Fault and the western and eastern parts of the fold were displaced ~6 km dextrally by the fault during, or following, a late phase of the Kanimblan Orogeny.

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Section: Introductionmentioning

confidence: 98%

Stratigraphy, structure and tectonics of Lower Ordovician and Devonian strata of the central part of the Wonominta Block, western New South Wales

Neef¹,

Bottrill²

2001

Australian Journal of Earth Sciences

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“…Significant faults and other features within the basin include the NW-SE trending Koonenberry Fault (Rose and Brunker 1969;Leitch et al 1987;Neef and Larsen 2003;Neef 2005), the prominent ENE-trending Darling River Lineament (Hills 1956), and the Bynguano Fault (Buckley 2001) on the eastern side of the Bancannia Trough. The Lake Wintlow Line separates the Bancannia Trough and the Pondie Range Sub-basin in the north and the Menindee Trough and Blantyre Sub-basin in the southwestern part of the basin.…”

Section: Structural Frameworkmentioning

confidence: 99%

Tectonostratigraphic evolution of the Blantyre sub-basin and adjacent regions, New South Wales, based on integration of seismic, gravity and well data.

Khalifa¹

2009

Journal and Proceedings of the Royal Society of New South Wales

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This paper presents the principal tectonostratigraphic features within the Blantyre Sub-basin, a central part of the regional Darling Basin, that results from deformation of the latest Silurian to Devonian sequence. This case study shows that by integrating well data, seismic data and gravity data, conceptual geologic models in the Blantyre Sub-basin and surrounding area can be constructed. Integration of the gravity contour map with two-way time structure contour maps suggest that five major structural features can be identified: (a) the Mount Emu High that is interpreted as an anticlinal fold with an associated thrust fault, (b) the Wilcannia High, interpreted as an uplift, clearly identified on the northern margin of the Blantyre Sub-basin, (c) the Snake Flat High, interpreted as an asymmetric anticlinal fold with a number of high-angle reverse faults, (d) a structural low occurring in the central part of the Blantyre Sub-basin, interpreted as an elongate synclinal fold that covers an area of approximately 400 square kilometres, and (e) another small structural low, interpreted to be a synclinal fold. Structure and isochore maps reveal that faults profile the primary control on subsidence patterns. Understanding these structural features should help to decrease the risks for hydrocarbon exploration by applying better defined and up-to-date concepts throughout the Blantyre Sub-basin.

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“…West of the fault the basement rocks (Cambrian-Precambrian rocks) have abundant magnetic anomalies, which are lacking east of the fault (Wilson, 1967;Stevens, 1985). Leitch et al (1987) considered that there are three late Precambrian to ?Early Cambrian stratigraphic units west of the mapped area.…”

Section: Geological Settingmentioning

confidence: 99%

The Mt. Daubeny Formation: arenite-rich ?Late Silurian-Early Devonian (Gedinnian) strata in far western New South Wales. and Addendum

Carranza‐Edwards¹,

Neef²,

Vaughan³

1990

Journal and Proceedings of the Royal Society of New South Wales

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The 6 km-thick, nonmarine Mt Daubeny Formation, commonly pale-red in colour, crops out in far western New South Wales. It is largely composed of arenite with subordinate siltstone and rudite. A basal orthoquartzite, the Koonburra Creek Quartzite Member, is present in the south whereas in the north three horizons (~ 0.5 km, 2.5 km and ~4.5 km above basement) contain andesite flows. The central part of the outcrop contains common 6m-thick orthoquartzite beds which are interbedded largely with pale-red or grey arenite and siltstone. The sequence containing orthoquartzite beds is at least 775m thick in che west and it is ~ 690m thick in the east where it is overlain by a ~610m sequence composed of brownred arenite and siltstone.The upper part of the formation is Early Devonian (Gedinnian) in age, is dated by fossil plants. The base of the formation is probably ~ 4 m.y. older than the fossiliferous horizon and this basal part may be latest Silurian in age. An unknown thickness of the formation has been removed by erosion since it was deposited.Palaeocurrents indicate that during the ?Latest Silurian-Early Devonian a mountainous terrain composed largely of Precambrian -? Cambrian rocks lay west of the present outcrop area of the formation area and provided the sediment from which the formation was formed.

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Terranes of the Wonominta block, far western New South Wales

Cited by 15 publications

References 9 publications

Stratigraphy, structure and tectonics of Lower Ordovician and Devonian strata of the central part of the Wonominta Block, western New South Wales

Stratigraphy, structure and tectonics of Lower Ordovician and Devonian strata of the central part of the Wonominta Block, western New South Wales

Tectonostratigraphic evolution of the Blantyre sub-basin and adjacent regions, New South Wales, based on integration of seismic, gravity and well data.

The Mt. Daubeny Formation: arenite-rich ?Late Silurian-Early Devonian (Gedinnian) strata in far western New South Wales. and Addendum

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