Architecture of volcanic rifted margins: new insights from the Exmouth – Gascoyne margin, Western Australia

Direen, Nicholas G.; Stagg, H.M.J.; Symonds, P. A.; Colwell, J. B.

doi:10.1080/08120090701769472

Cited by 55 publications

(79 citation statements)

References 37 publications

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“…This reflection displays numerous breaks in lateral continuity and is vertically offset indicating the presence of faults. This extensive horizon is interpreted as a Valanginian-Late Hauterivian unconformity associated with the breakup between India-Madagascar and AustraliaAntarctica (Borissova, 2002;Direen et al, 2008). This unconformity is thought to constitute a layer of volcanics, an interpretation that is reinforced from P-wave velocity analysis.…”

Section: Valanginian-late Hauterivian Breakup Unconformitymentioning

confidence: 87%

“…The Kerguelen hotspot was particularly active throughout the Albian with an estimated magma flux of 0.9 km 3 yr −1 (Coffin et al, 2002), which rapidly built-up a massive basaltic platform. Heat flux from the Kerguelen hotspot is a possible cause for the thin continental crust in the vicinity of the Mentelle Basin as predicted by Direen et al (2008). By the time of maximum magma output, plate motion resulted in the Kerguelen hotspot moving westwards relative to the Mentelle Basin leading to thermally relaxation-induced subsidence creating the central depocenter.…”

Section: Structural Reappraisal Of the Mentelle Basinmentioning

confidence: 99%

“…1 and 2) is the northern arm of a triple junction that formed during the final stages of Gondwana breakup (e.g. Powell et al, 1988;Royer and Coffin, 1992;Direen et al, , 2008. The tectonic history of the Mentelle Basin within this milieu is poorly defined (Borissova, 2002;Bradshaw et al, 2003;Borissova et al, 2010a, b), with basin history largely extrapolated from better-studied areas to the north (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

“…This rift propagated southwards through the Gascoyne, Cuvier and Perth margins during the Early Cretaceous producing a free plate boundary (Valanginian-Hauterivian) (Veevers and Li, 1991;Song and Cawood, 2000). The Argo AP -Wallaby-Zenith Fracture Zone rifted margin to the north is volcanic in nature (Planke et al, 2000;Direen et al, , 2008 (Figs. 1 and 2).…”

Section: Geological Settingmentioning

confidence: 99%

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Re-evaluation of the Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets

et al. 2011

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Abstract.Vintage 2-D (two-dimensional) seismic reflection surveys from the sparsely explored Mentelle Basin (western Australian margin) have been reprocessed and integrated with a recent high-quality 2-D seismic survey and stratigraphic borehole data. Interpretation of these data sets allows the internal geometry of the Mentelle Basin fill and depositional history to be reanalysed and new insights into its formation revealed. Basin stratigraphy can be subdivided into several seismically defined megasequences separated by major unconformities related to both breakup between IndiaMadagascar and Australia-Antarctica in the ValanginianLate Hauterivian and tectonically-driven switches in deposition through the Albian.Resting on the Valanginian-Late Hauterivian breakup unconformity are several kilometre-scale mounded structures that formed during Late Jurassic to Early Cretaceous extension. These have previously been interpreted as volcanic edifices although direct evidence of volcanic feeder systems is lacking. An alternative interpretation is that these features may be carbonate build-ups. The latter interpretation carries significant climatic ramifications since carbonate build-ups would have formed at high palaeolatitude, ∼60 • S.Soon after breakup, initial subsidence resulted in a shallow marine environment and deposition of Barremian-Aptian silty-sandy mudstones. As subsidence continued, thick successions of Albian ferruginous black clays were deposited. Internally, seismic megasequences composed of successions of black clays show previously unresolved unconformities, onlapping and downlapping packages, which reflect a com-

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Section: Valanginian-late Hauterivian Breakup Unconformitymentioning

confidence: 87%

Section: Structural Reappraisal Of the Mentelle Basinmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Re-evaluation of the Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets

et al. 2011

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“…Dunbar and Sawyer, 1989;Bertotti et al, 1993;Manatschal and Bernoulli, 1998). In the North Atlantic (Lundin and Doré, 2011) and the NW Shelf of Australia (Direen et al, 2008), the final breakup cuts not only through ancient orogenic belts, but also through earlier rift systems, suggesting that inheritance neither controls the location of breakup, nor the onset of seafloor spreading. Unfortunately, thick sedimentary and/or magmatic sequences prevent detailed investigation of the pre-rift crustal and lithospheric structures and composition.…”

Section: Introductionmentioning

confidence: 96%

The role of inheritance in structuring hyperextended rift systems: Some considerations based on observations and numerical modeling

Manatschal

Lavier²,

Chenin³

2015

Gondwana Research

166

112

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International audienceA long-standing question in Earth Sciences is related to the importance of inheritance in controlling tectonic processes. In contrast to physical processes that are generally applicable, assessing the role of inheritance suffers from two major problems: firstly, it is difficult to appraise without having insights into the history of a geological system; and secondly all inherited features are not reactivated during subsequent deformation phases. Therefore, the aim of this paper is to give some conceptual framework about how inheritance may control the architecture and evolution of hyperextended rift systems.In this paper, we use the term inheritance to refer to the difference between an “ideal” layer-cake type lithosphere and a “real” lithosphere containing heterogeneities. The underlying philosophy of this work is that the evolution of hyperextended rift systems reflects the interplay between their inheritance (innate/“genetic code”) and the physical processes at play (acquired/external factors). Thus, by observing the architecture and evolution of hyperextended rift systems and integrating the physical processes, one may get hints on what may have been the original inheritance of a system.We first define 3 types of inheritance, namely structural, compositional and thermal inheritance and develop a simple and robust terminology able to describe and link observations made at different scales using geological, geophysical and modeling approaches. To this, we add a definition of rift-induced processes, i.e. processes leading to compositional changes during rifting (e.g. serpentinization or decompression melting). Using this approach, we focus on 3 well-studied rift systems that are the Alpine Tethys, Pyrenean–Bay of Biscay and Iberia–Newfoundland rift systems. However, as all these examples are magma-poor, hyperextended rift systems that evolved over a Variscan lithosphere the concepts developed in this paper cannot be applied universally. For the studied examples we can show that:1) the inherited structures did not significantly control the location of breakup2) the inherited thermal state may control the mode and architecture of rift systems, in particular the architecture of the necking zone3) the architecture of the necking zone may be influenced by the distribution and importance of ductile layers during decoupled deformation and is consequently controlled by the thermal structure and/or the inherited composition of the crust4) conversely, the deformation in hyperextended domains is strongly controlled by weak hydrated minerals (e.g. clay, serpentinite) that result from the breakdown of feldspar and olivine due to fluid and reaction assisted deformation5) inherited structures, in particular weaknesses, are important in controlling strain localization on a local scale and during early stages of rifting6) inherited mantle composition and rift-related mantle processes may control the rheology of the mantle, the magmatic budget, the thermal structure and the localization of final rifting.Thes...

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Seismic reflection data reveal the 3D subsurface structure of pit craters

Magee

Kling

Byrne

et al. 2021

Preprint

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Architecture of volcanic rifted margins: new insights from the Exmouth – Gascoyne margin, Western Australia

Cited by 55 publications

References 37 publications

Re-evaluation of the Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets

Re-evaluation of the Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets

The role of inheritance in structuring hyperextended rift systems: Some considerations based on observations and numerical modeling

Seismic reflection data reveal the 3D subsurface structure of pit craters

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