The Structure and Evolution of the Bass Basin as Delineated by Aeromagnetic Data

Gunn, Peter; Mitchell, John C.; Meixner, A.J.

doi:10.1071/eg997214

Cited by 10 publications

(12 citation statements)

References 2 publications

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“…In particular, one belt can be clearly traced without apparent dislocations from offshore western Tasmania to the Mornington Peninsula in Victoria. The corresponding outcrops have been studied in southeastern King Island and led several authors to consider it as a strong evidence of an extension of the Tasmanian crust towards Victoria (Gunn et al, 1997a(Gunn et al, , 1997bVandenBerg et al, 2000;Cayley et al, 2002;Meffre et al, 2004;Calver, 2007;Moore et al, 2013). Other belts of high magnetic character, including the Togari Group, Rocky Cape Group and Arthur Lineament, appear to be cross-cut by a younger high magnetic anomaly almost in the middle of Bass Strait, coincident with the position of the Bass Basin.…”

Section: An Integrated Approach -Constraints From Other Datasetsmentioning

confidence: 99%

“…A diverse range of techniques have so far been exploited to infer information on crustal structure and composition beneath Bass Strait, mainly in studies focusing on similarities recognised in the geology (Crawford and Berry, 1992;Powell and Baillie, 1992;Reed, 2001;Cayley, 2011) and in geophysical, geochemical and other types of data in Tasmania and/or mainland Australia. Geophysical methods include potential field imaging and modelling (e.g., Leaman et al, 1994;Gunn et al, 1997aGunn et al, , 1997bMorse et al, 2009;McLean et al, 2010), seismic reflection profiling (Drummond et al, 2000;Cayley et al, 2011) and seismic tomography (Rawlinson and Kennett, 2008). Palaeomagnetic evidence in the form of magnetic remanence (Li et al, 1997) has also been used.…”

Section: Introductionmentioning

confidence: 99%

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Linking mainland Australia and Tasmania using ambient seismic noise tomography: Implications for the tectonic evolution of the east Gondwana margin

et al. 2015

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Section: An Integrated Approach -Constraints From Other Datasetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linking mainland Australia and Tasmania using ambient seismic noise tomography: Implications for the tectonic evolution of the east Gondwana margin

et al. 2015

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“…This raises the prospect that the sapphire-bearing melts crystallized at mantle levels, particularly as higher-level ultramafic intrusive bodies are not noted in northeastern Tasmania, even in airborne geophysical surveys (Gunn et al, 1996).…”

Section: Contrasts In Gem Corundum Characteristics Eastern Australiamentioning

confidence: 99%

Contrasts in gem corundum characteristics, eastern Australian basaltic fields: trace elements, fluid/melt inclusions and oxygen isotopes

Zaw¹,

Sutherland²,

Della-Pasqua³

et al. 2006

Mineral. mag.

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Corundum xenocrysts from alkaline basalt fields differ in characteristics and hence lithospheric origins. Trace element, fluid/melt inclusion and oxygen isotope studies on two eastern Australian corundum deposits are compared to consider their origins. Sapphires from Weldborough, NE Tasmania, are magmatic (high-Ga, av. 200 ppm) and dominated by Fe (av. 3300 ppm) and variable Ti (av. 400 ppm) as chromophores. They contain Cl, Fe, Ga, Ti and CO 2 -rich fluid inclusions and give d 18 O values (5.1À6.2%) of mantle range. Geochronology on companion zircons suggests several sources (from 290 Ma to 47 Ma) were disrupted by basaltic melts (47 Ô 0.6 Ma). Gem corundums from Barrington, New South Wales, also include magmatic sapphires (Ga av. 170 ppm; d 18 O 4.6À5.8%), but with more Fe (av. 9000 ppm) and less Ti (av. 300 ppm) as chromophores. Zircon dating suggests that gem formation preceded and was overlapped by Cenozoic basaltic melt generation (59À4 Ma). In contrast, a metamorphic sapphire-ruby suite (low-Ga, av. 30 ppm) here incorporates greater Cr into the chromophores (up to 2250 ppm). Fluid inclusions are CO 2 -poor, but melt inclusions suggest some alkaline melt interaction. The d 18 O values (5.1À6.2%) overlap magmatic sapphire values. Interactions at contact zones (T = 780À940ºC) between earlier Permian ultramafic bodies and later alkaline fluid activity may explain the formation of rubies.

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“…The most recent and extensive period of volcanism occurred during the Oligocene to Miocene, with volcanic mounds, vents, lava flows and intrusive sills and dykes widespread throughout the central and northeastern Bass Basin (Smit, 1988;Gunn et al, 1997;Cummings and Blevin, 2003;Cummings et al, 2004). Large volcanic mounds of Miocene age occur near the Bass-1, Yolla-1 and Cormorant-1 wells (Fig.…”

Section: Bass Basinmentioning

confidence: 99%

Seismic analysis of igneous systems in sedimentary basins and their impacts on hydrocarbon prospectivity: examples from the southern Australian margin

Holford¹,

Schofield²,

MacDonald³

et al. 2012

The APPEA Journal

111

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The increasing availability of 3D seismic data from sedimentary basins at volcanic and non-volcanic continental margins has provided fundamental new insights into both the storage and transport of magma in the continental crust. As global hydrocarbon exploration increasingly focuses on passive margin basins with evidence for past intrusive and extrusive igneous activity, constraining the distribution, timing and pathways of magmatism in these basins is essential to reduce exploration risk. Producing and prospective Australian passive margin basins where igneous systems have been identified include the Bight, Otway, Bass, Gippsland and Sorell basins of the southern margin. This paper reviews both the impacts of volcanic activity on sedimentary basin hydrocarbon prospectivity (e.g. advective heating, reservoir compartmentalisation and diagenesis), and the styles, distribution and timing of late Cretaceous-Recent extrusive and intrusive igneous activity along basins of the southern Australian margin, providing illustrative examples based on 2D and 3D seismic reflection data. KEYWORDSAustralia, sedimentary basins, volcanics, intrusives, seismic reflection, petroleum systems. INTRODUCTIONThe past few decades have witnessed a progressive shift of focus in the quest for new conventional hydrocarbon resources, away from the onshore and shallow-water regions that dominated production throughout the 20th century, and towards the submerged and often deep-water (>500 m below sea level) continental margins that fringe the deep ocean basins (White et al, 2003). Although exploration of all hydrocarbon basins is subject to problems (Doré et al, 2002), exploration of continental margins poses major risks due to the significant geological uncertainties that stem from sparse data coverage and their poorly understood formation and evolution. An important geological risk associated with exploration in almost all continental margins is the presence of igneous rocks. Volcanic activity is a key outcome of lithospheric stretching processes (Planke et al, 2000), and thus all extensional sedimentary basins located along continental margins witness some degree of intrusive and extrusive activity during their life spans. This includes basins that are located along margins considered to be 'cold ' , or 'nonvolcanic' (White et al, 2003).Hydrocarbon exploration has traditionally overlooked or avoided basins containing igneous rocks (Schutter, 2003; Rohrman, 2007). This is mainly because of the difficulties associated with seismic imaging of sedimentary sequences beneath basalt covers, and the detrimental short-term and long-term impacts on petroleum systems, including reservoir degradation and compartmentalisation (Schutter, 2003; Planke et al, 2005; Rohrman, 2007). The depletion of reserves in traditional hydrocarbon provinces, however-coupled with improvements in seismic acquisition and processing methods in basins containing problematic high-impedance layers (e.g. basalts)-has led to increasing exploration activity, with some not...

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The Structure and Evolution of the Bass Basin as Delineated by Aeromagnetic Data

Cited by 10 publications

References 2 publications

Linking mainland Australia and Tasmania using ambient seismic noise tomography: Implications for the tectonic evolution of the east Gondwana margin

Linking mainland Australia and Tasmania using ambient seismic noise tomography: Implications for the tectonic evolution of the east Gondwana margin

Contrasts in gem corundum characteristics, eastern Australian basaltic fields: trace elements, fluid/melt inclusions and oxygen isotopes

Seismic analysis of igneous systems in sedimentary basins and their impacts on hydrocarbon prospectivity: examples from the southern Australian margin

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