Seismic volcanostratigraphy of the Gascoyne margin, Western Australia

Rey, S.; Planke, Sverre; Symonds, P. A.; Faleide, Jan Inge

doi:10.1016/j.jvolgeores.2006.11.013

Cited by 49 publications

(48 citation statements)

References 20 publications

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“…This extension was accommodated by an array of NE-SW striking, low-throw (c. <0.1 km), conjugate normal faults that are predominantly hosted within the Dingo Claystone (Figs 1b and 2) Magee et al, 2013c). The exact timing of 'syn-rift II' faulting is poorly constrained (Figs 1b and 2), with previous studies suggesting faulting initiated in either the early Tithonian (Driscoll & Karner, 1998;Mihut & M€ uller, 1998), early Berriasian (Tindale et al, 1998) or early Valanginian (Rey et al, 2008). In contrast, proposed that the conjugate faults developed during the late Berriasian or early Valanginian in response to thermal subsidence.…”

Section: Geological Settingmentioning

confidence: 88%

“…Due to uncertainties regarding the precise position and age of the 'post-rift I' and 'syn-rift II' transition (Driscoll & Karner, 1998;Mihut & M€ uller, 1998;Tindale et al, 1998;Rey et al, 2008), this boundary is only mapped locally (e.g., Figs 1b, 2 and 4). Additionally, 383 faults have been mapped every c. 140 m along-strike and fault traces extracted at different stratigraphic levels (e.g., Fig.…”

Section: Tectono-stratigraphic and Magmatic Frameworkmentioning

confidence: 99%

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Fault‐controlled fluid flow inferred from hydrothermal vents imaged in 3D seismic reflection data, offshore NW Australia

et al. 2015

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Fluid migration pathways in the subsurface are heavily influenced by pre-existing faults. Although studies of active fluid-escape structures can provide insights into the relationships between faults and fluid flow, they cannot fully constrain the geometry of and controls on the contemporaneous subsurface fluid flow pathways. We use 3D seismic reflection data from offshore NW Australia to map 121 ancient hydrothermal vents, likely related to magmatic activity, and a normal fault array considered to form fluid pathways. The buried vents consist of craters up to 264 m deep, which host a mound of disaggregated sedimentary material up to 518 m thick. There is a correlation between vent alignment and underlying fault traces. Seismic-stratigraphic observations and fault kinematic analyses reveal that the vents were emplaced on an intra-Tithonian seabed in response to the explosive release of fluids hosted within the fault array. We speculate that during the Late Jurassic the convexupwards morphology of the upper tip-lines of individual faults acted to channelize ascending fluids and control where fluid expulsion and vent formation occurred. This contribution highlights the usefulness of 3D seismic reflection data to constraining normal fault-controlled subsurface fluid flow.

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Section: Geological Settingmentioning

confidence: 88%

Section: Tectono-stratigraphic and Magmatic Frameworkmentioning

confidence: 99%

Fault‐controlled fluid flow inferred from hydrothermal vents imaged in 3D seismic reflection data, offshore NW Australia

et al. 2015

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“…Features synchronous with breakup are the extrusion of seaward-dipping reflectors and flood basalts from the Gascoyne margin, Cuvier margin rift axis, Wallaby Saddle, and in the Galah Province ( Fig. 1; Symonds et al, 1998;Rey et al, 2008). Extrusives are relatively scarce in the Exmouth region compared with other volcanic margins, with many of the extrusive rocks in the South Exmouth subbasin probably eroded, as observed by truncated sills on seismic data (Mihut and Müller, 1998).…”

Section: Geologic Settingmentioning

confidence: 97%

Delineating the Exmouth mantle plume (NW Australia) from denudation and magmatic addition estimates

Rohrman¹

2015

Lithosphere

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Volcanic margins are a class of large igneous provinces (LIPs) characterized by rifting-derived basaltic magmatism. This is commonly attributed to extension-related lithospheric thinning, generating decompression melting. Another mechanism influencing magmatism on volcanic margins is mantle plume-induced lithospheric thinning. Unfortunately, it is difficult to differentiate between these mechanisms because they seem to take place almost contemporaneously. Whereas rifted volcanic margins produce linear denudation and magmatic addition patterns, mantle plumes or active upwellings would generate more subcircular domal patterns. Here, I use magmatic addition and denudation patterns to discriminate between these scenarios in a data set from the volcanic margin offshore NW Australia. Seismic and well data results suggest the presence of a domal component that is used to delineate the Late Jurassic Exmouth mantle plume. This upwelling was centered on a highly extended and subsided continental fragment bounded by the present-day subsea Sonne and Sonja Ridges and includes the Cuvier margin and Cape Range fracture zone. The region is characterized by ~2.6 km of denudation and ~500 m of tectonic uplift, with erosion products acting as source material for the Early Cretaceous Lower Barrow delta. Denudation analysis indicates that only ~40% of the seismically detected magmatic underplate is melt related, with the effective underplate ~4 km thick near the locus of uplift and decreasing in the outer regions. Tectonic subsidence analysis, seismic stratigraphy, and plate reconstruction suggest that the plume-induced domal uplift preceded magmatism and breakup. Plume activity was followed by a westward-propagating hotspot track, possibly terminating in Greater India (present Tibet).

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“…In magma-rich margins, though magmatism may be very extensive within the rift basin segments, it is generally absent along adjoining transform domains (Berndt et al, 2001;Rey et al, 2008). This observation has been explained by reduced ambient mantle temperature and melt production along the transform margin as a result of lowered heatflow from the oceanic lithosphere to the adjacent continental lithosphere (e.g., Berndt et al, 2001).…”

Section: Lower Crustal Bodies (Lcbs): Evidence Of Rift-related Volcanmentioning

confidence: 99%

Rift–shear architecture and tectonic development of the Ghana margin deduced from multichannel seismic reflection and potential field data

Antobreh

Faleide

Tsikalas

et al. 2009

Marine and Petroleum Geology

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Seismic volcanostratigraphy of the Gascoyne margin, Western Australia

Cited by 49 publications

References 20 publications

Fault‐controlled fluid flow inferred from hydrothermal vents imaged in 3D seismic reflection data, offshore NW Australia

Fault‐controlled fluid flow inferred from hydrothermal vents imaged in 3D seismic reflection data, offshore NW Australia

Delineating the Exmouth mantle plume (NW Australia) from denudation and magmatic addition estimates

Rift–shear architecture and tectonic development of the Ghana margin deduced from multichannel seismic reflection and potential field data

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