The Lowmead Graben—Geology, Tertiary oil shale genesis and regional tectonic implications

McConnochie, M. J.; Henstridge, David A.

doi:10.1080/08120098508729324

Cited by 13 publications

(2 citation statements)

References 4 publications

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“…3), which is similar to the stratigraphy of the Cenozoic Lowmead Basin to the east (Fig. 2b) (McConnochie & Henstridge, 1985). A middle-late Eocene age has been suggested for the upper 350 m of the Nagoorin beds (units C to E) based on palynological studies (Wood, 1982).…”

Section: Geological Settingsupporting

confidence: 79%

Style and intensity of late Cenozoic deformation in the Nagoorin Basin (eastern Queensland, Australia) and implications for the pattern of strain in an intraplate setting

et al. 2018

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Eastern Australia was affected by late Cenozoic intraplate deformation in response to far-field stress transmitted from the plate boundaries, but little is known about the intensity and pattern of this deformation. We used recently surveyed two-dimensional seismic reflection lines and aeromagnetic data, and data from the recently released Australian Stress Map, to investigate the structure of the Nagoorin Basin in eastern Queensland. The western margin of the Nagoorin beds was displaced by the Boynedale Fault, which is a NNW-striking SW-dipping oblique strike-slip reverse fault with a vertical throw ofc.900 m andc.16 km sinistral displacement. A significant part of this large sinistral displacement is interpreted to have occurred prior to late Cenozoic time. Several low-angle (<30°) thin-skinned thrusts with a flat-ramp geometry also displaced the Nagoorin beds, which are interpreted to have developed along detachment surfaces in oil shales and claystone. The Boynedale Fault is a segment within longer NNW-striking faults that include the North Pine and West Ipswich fault systems in eastern Queensland. These NNW-striking faults are potentially active, and may accommodate neotectonic thrust movement in response to the present-day NE–SW orientation of SHmax. Results of this study, in conjunction with previous information on sedimentary basins in eastern Australia, indicate that Cenozoic contractional deformation is stronger at the continental margins, possibly due to the presence of pre-existing rift-related structures.

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Section: Geological Settingsupporting

confidence: 79%

Style and intensity of late Cenozoic deformation in the Nagoorin Basin (eastern Queensland, Australia) and implications for the pattern of strain in an intraplate setting

et al. 2018

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“…These basins host oil shales which have been explored since 1980 for hydrocarbons (McConnochie & Henstridge 1985). Our Eocene model shows extremely small-magnitude maximum horizontal stresses (Figure 10), bordering on an extensional regime, in qualitative agreement with the Eocene change in stress regime indicated by graben formation in East Queensland.…”

Section: Cretaceous (Ca 100 Ma)mentioning

confidence: 99%

Australian paleo-stress fields and tectonic reactivation over the past 100 Ma

Müller

Dyksterhuis

Rey

2012

Australian Journal of Earth Sciences

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Even though a multitude of observations suggest time-dependent regional tectonic reactivation of the Australian Plate, its large-scale intraplate stress field evolution remains largely unexplored. This arises because intraplate paleo-stress models are difficult to construct, and that observations of tectonic reactivation are often hard to date. However, because the Australian plate has undergone significant changes in plate boundary types and geometries since the Cretaceous, we argue that even simple models can provide some insights into the nature and timing of crustal reactivation through time. We present Australian intraplate stress models for key times from the Early Cretaceous to the present, and link them to geological observations for evaluating time-dependent fault reactivation. We focus on the effect time-dependent geometries of mid-ocean ridges, subduction zones and collisional plate boundaries around Australia have on basin evolution and fault reactivation through time by reconstructing tectonic plates, restoring plate boundary configurations, and modelling the effect of selected time-dependent plate driving forces on the intraplate stress field of a rheologically heterogeneous plate. We compare mapped fault reactivation histories with paleo-stress models via time-dependent fault slip tendency analysis employing Coulomb-Navier criteria to determine the likelihood of strain in a body of rock being accommodated by sliding along pre-existing planes of weakness. This allows us to reconstruct the dominant regional deformation regime (reverse, normal or strike-slip) through time. Our models illustrate how the complex interplay between juxtaposed weak and strong geological plate elements and changes in far-field plate boundary forces have caused intraplate orogenesis and/or tectonic reactivation in basins and fold belts throughout Australia.

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Eogenetic siderites in lacustrine oil shales from Queensland, Australia, a stable isotope study

Spiro¹,

Gibson

Shaw

1993

Chemical Geology

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The Lowmead Graben—Geology, Tertiary oil shale genesis and regional tectonic implications

Cited by 13 publications

References 4 publications

Style and intensity of late Cenozoic deformation in the Nagoorin Basin (eastern Queensland, Australia) and implications for the pattern of strain in an intraplate setting

Style and intensity of late Cenozoic deformation in the Nagoorin Basin (eastern Queensland, Australia) and implications for the pattern of strain in an intraplate setting

Australian paleo-stress fields and tectonic reactivation over the past 100 Ma

Eogenetic siderites in lacustrine oil shales from Queensland, Australia, a stable isotope study

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