Resolving the nature and geometry of major fault systems from geophysical and structural analysis: The Palmerville Fault in NE Queensland, Australia

Vos, Ivo Maria Antoine; Bierlein, Frank P; Barlow, M A; Betts, Peter Graham

doi:10.1016/j.jsg.2006.07.016

Cited by 19 publications

(7 citation statements)

References 18 publications

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“…The assumption made in worming is that maxima derived from the higher continuation elevations reflect deeper structure while those from smaller continuation distances relate to shallower sources, but this relationship is not always guaranteed due the nonuniqueness of potential field data [ Archibald et al ., ]. Nonetheless, plotting the “worms” or maxima locations in 3‐D by using the continuation distance as a proxy for depth provides a visual summary of possible geologic surfaces that can be used for structural interpretations [ Bierlein et al ., ; Vos et al ., ]. The color‐coded depth scale in Figure a and the inferred surfaces based on these depth estimates are approximate.…”

Section: Component Data Sets and Underlying Methodologiesmentioning

confidence: 99%

The 3‐dimensional construction of the Rae craton, central Canada

Snyder

Craven

Pilkington

et al. 2015

Geochem Geophys Geosyst

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Reconstruction of the 3‐dimensional tectonic assembly of early continents, first as Archean cratons and then Proterozoic shields, remains poorly understood. In this paper, all readily available geophysical and geochemical data are assembled in a 3‐D model with the most accurate bedrock geology in order to understand better the geometry of major structures within the Rae craton of central Canada. Analysis of geophysical observations of gravity and seismic wave speed variations revealed several lithospheric‐scale discontinuities in physical properties. Where these discontinuities project upward to correlate with mapped upper crustal geological structures, the discontinuities can be interpreted as shear zones. Radiometric dating of xenoliths provides estimates of rock types and ages at depth beneath sparse kimberlite occurrences. These ages can also be correlated to surface rocks. The 3.6–2.6 Ga Rae craton comprises at least three smaller continental terranes, which “cratonized” during a granitic bloom. Cratonization probably represents final differentiation of early crust into a relatively homogeneous, uniformly thin (35–42 km), tonalite‐trondhjemite‐granodiorite crust with pyroxenite layers near the Moho. The peak thermotectonic event at 1.86–1.7 Ga was associated with the Hudsonian orogeny that assembled several cratons and lesser continental blocks into the Canadian Shield using a number of southeast‐dipping megathrusts. This orogeny metasomatized, mineralized, and recrystallized mantle and lower crustal rocks, apparently making them more conductive by introducing or concentrating sulfides or graphite. Little evidence exists of thin slabs similar to modern oceanic lithosphere in this Precambrian construction history whereas underthrusting and wedging of continental lithosphere is inferred from multiple dipping discontinuities.

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Section: Component Data Sets and Underlying Methodologiesmentioning

confidence: 99%

The 3‐dimensional construction of the Rae craton, central Canada

Snyder

Craven

Pilkington

et al. 2015

Geochem Geophys Geosyst

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“…It is interpreted to have a dip which is shallow to the northeast and then flattens out to near subhorizontal, although as mentioned above, Fawckner (1981) and Shaw et al (1987) interpreted it to dip to the west, and suggested thrusting of the Etheridge Province towards the east. based on multiscale wavelet edge analysis combined with forward modelling of magnetic and gravity data, Vos et al (2006a) considered that the Palmerville Fault was a steeply eastward-dipping structure which could become listric at depth. Champion and Bultitude (1994) reached similar conclusions, based on marked changes in both granite geochemistry and their isotope signatures, which occur to the east of the position of the Palmerville Fault.…”

Section: The Tasman Linementioning

confidence: 99%

Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

et al. 2012

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“…The major structural control in the Mitchell catchment is the southnorth striking, steeply dipping Palmerville fault (Vos et al, 2006), which is considered a reactivated Precambrian structure (see Vos et al, 2006, for review). This fault separates the adjacent Palaeozoic Hodgkinson Province to the east from Proterozoic metamorphic rocks to the west, which are overlain by fl uvial megafan deposits (Figure 3).…”

Section: Geologymentioning

confidence: 99%

Alluvial gully erosion: an example from the Mitchell fluvial megafan, Queensland, Australia

Brooks

Shellberg

Knight

et al. 2009

Earth Surf Processes Landf

133

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Considerable attention has been focused on the role of gullies as a contributor to contemporary sediment loads of rivers in Australia. In southern Australia rapid acceleration of hillslope gully erosion has been widely documented in the postEuropean period (~ last 200 years). In the northern Australian tropics, however, gully erosion processes operating along alluvial plains have not been well documented and can differ substantially from those gullies eroding into colluvium on hillslopes. Aerial reconnaissance surveys in 2004 along 13 500 km of the main stem rivers that drain into the Gulf of Carpentaria (GoC), identifi ed extensive areas of alluvial lands that have been impacted by a pervasive form of gully erosion. More detailed remote sensing based mapping within the 31 000 km 2 Mitchell River fl uvial megafan has identifi ed that active gullying into alluvium occupies ~ 0·4% (129 km 2 ) of the lower Mitchell catchment. These alluvial gullies are concentrated along main drainage channels and their scarp heights are highly correlated to the local relief between the fl oodplain and river thalweg. While river incision into the megafan since the Pleistocene has developed the relief potential for erosion, other factors such as fl oodplain hydrology, soil dispersibility, and vegetation also infl uence the distribution of gullies. In this paper we present a conceptual model of alluvial gullies, and contend that they represent a distinct end member in the continuum of gully forms that have been described in the geomorphic literature. An understanding of the processes driving this form of alluvial gullying can only be gained when they are differentiated from widely described colluvial hillslope gully models and theories. We present evidence of type examples of alluvial gullying in the Mitchell, and through analysis of their distribution and morphology at different scales, highlight some of the key mechanisms that are potentially initiating these features and driving their expansion.

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Resolving the nature and geometry of major fault systems from geophysical and structural analysis: The Palmerville Fault in NE Queensland, Australia

Cited by 19 publications

References 18 publications

The 3‐dimensional construction of the Rae craton, central Canada

The 3‐dimensional construction of the Rae craton, central Canada

Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

Alluvial gully erosion: an example from the Mitchell fluvial megafan, Queensland, Australia

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