Seismic reflectivity of the Sudbury Structure North Range from borehole logs

White, Don; Milkereit, B.; Wu, Juntao; Salisbury, Matthew H.; Mwenifumbo, J.; Berrer, E. K.; Moon, Wooil M.; Lodha, G.S.

doi:10.1029/93gl02609

Cited by 16 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deepest reflections can be traced upward to the boundary between the -these south-dipping reflections, and the manner in which they detachment surface along which northwest-southeast shortening took place. The observed offset of lithologic contacts by geophysical logging (White et al 1994), and electromagnetic up to 5 km at the southwest closure of the SIC (Fig. 1) is the profiling (Boerner et al 1994b).…”

Section: South Rangementioning

confidence: 93%

Timing constraints on deformation history of the Sudbury Impact Structure

Wu¹,

Milkereit²,

Boerner³

1994

Can. J. Earth Sci.

View full text Add to dashboard Cite

Herein, we present new high-resolution seismic images of the Sudbury Impact Structure, acquired across the Sudbury Igneous Complex and its environs, which provide evidence for the relative timing of the deformation events that reshaped the initial Sudbury Structure. The seismic images show that the lower unit of the Sudbury basinal fill sediments, the Onwatin argillite, is penetrated by a set of blind, imbricated thrusts, whereas the overlying Chelmsford turbidites are unaffected by faulting. We interpret this observation to mean that the deposition of the Chelmsford sediments postdates the latest major deformation of the Sudbury Structure, suggesting that the uniform paleocurrent trends observed in the Chelmsford turbidites are not related to the initial shape of the Sudbury Structure.Nous prksentons ici de nouvelles images sismiques de haute rCsolution de la structure d'impact de Sudbury, prClevCes en travers du Complexe ignC de Sudbury et ses environs; ces images fournissent des enseignements sur la pCriode relative des Cvknements de dCformation qui ont modifik la structure initiale de Sudbury. Les images sismiques rkvklent que I'unitC inferieure composCe des sCdiments de remplissage du bassin de Sudbury, l'argilite d'onwatin, est pCnCtrCe par un ensemble masquC de failles imbriquCes, tandis que les turbidites de Chelmsford sus-jacentes ne sont pas affectkes par les failles. Nous croyons que cette observation signifie que le dCpBt des skdiments de Chelmsford postdate la dernikre dCformation majeure de la structure de Sudbury, ce qui suggkre que les directions uniformes des palCocourants observkes dans les turbidites de Chelmsford ne sont pas likes i la morphologie initiale de la structure de Sudbury.[Traduit par la r6dactionlCan.

show abstract

Section: South Rangementioning

confidence: 93%

Timing constraints on deformation history of the Sudbury Impact Structure

Wu¹,

Milkereit²,

Boerner³

1994

Can. J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…If) and Sudbury-2 ( Fig. lg) boreholes reach depths of about 900 and 2000 rn, respectively White et al 1994). Both boreholes were drilled for mineral exploration purposes.…”

Section: Canada: Sudbury Impact Structurementioning

confidence: 99%

Upper-crustal seismic velocity heterogeneity as derived from a variety ofP-wave sonic logs

Holliger¹

1996

Geophysical Journal International

138

109

View full text Add to dashboard Cite

S U M M A R YSonic-log measurements provide detailed 1-D information on the distribution of elastic properties within the upper crystalline crust at scales from about one metre to several kilometres. 10 P-wave sonic logs from six upper-crustal drill sites in Europe and North America have been analysed for their second-order statistics. The penetrated lithological sequences comprise Archean volcanic sequences, Proterozoic mafic layered intrusions, and Precambrian to Phanerozoic gneisses and granites. Despite this variability in geological setting, tectonic history, and petrological composition, there are notable similarities between the various data sets: after removing a large-scale, deterministic component from the observed velocity-depth function, the residual velocity fluctuations of all data sets can be described by autocovariance functions corresponding to bandlimited self-affine stochastic processes with quasi-Gaussian probability density functions. Depending on the maximum spatial wavelength present in the stochastic part of the data, the deterministic trend can be approximated either by a low-order polynomial best fit or by a moving-average of the original sonic-log data. The choice of the trend has a significant impact on the correlation length and on the standard deviation of the residual stochastic component, but does not affect the Hurst number. For trends defined by low-order polynomial best fits, correlation lengths were found to range from 60 to 160m, whereas for trends defined by a moving average the correlation lengths are dominated by the upper cut-off wavenumber of the corresponding filter. Regardless of the trend removed, the autocovariance functions of all data sets are characterised by low Hurst numbers of around 0.1-0.2, or equivalently by power spectra decaying as -l/k. A possible explanation of this statistical uniformity is that sonic-log fluctuations are more sensitive to the physical state, in particular to the distribution of cracks, than to the petrological composition of the probed rocks.

show abstract

“…Lithoprobe was instrumental in establishing acquisition, processing, and interpretation approaches suitable for the hard-rock environment that is typical to several volcanogenic massive sulfide mining camps across Canada. This includes the Bathurst , Buchans (Spencer et al, 1993;Wright et al, 1994), Manitouwadge (Roberts et al, 2003), Matagami (Milkereit et al, 1992a;Adam et al, 1996Adam et al, , 1998Adam et al, , 2003Calvert and Li, 1999), Noranda (Adam et al, 1992;Verpaelst et al, 1995;Perron and Calvert, 1998), Selbaie (Milkereit et al, 1992b;Perron et al, 1997), Sudbury (White et al, 1994;Wu et al, 1995;Adam et al, 2000;Milkereit et al, 2000), and Thompson (White et al, , 2000 mining camps. During Lithoprobe, seismic reflection methods were proposed as a deep exploration tool that could improve the knowledge of structures and stratigraphy in existing mining camps, but also to provide drilling targets at depths beyond those achieved with conventional geophysical mining methods.…”

Section: Canadamentioning

confidence: 99%

Seismic methods in mineral exploration and mine planning: A general overview of past and present case histories and a look into the future

et al. 2012

View full text Add to dashboard Cite

Due to high metal prices and increased difficulties in finding shallower deposits, the exploration for and exploitation of mineral resources is expected to move to greater depths. Consequently, seismic methods will become a more important tool to help unravel structures hosting mineral deposits at great depth for mine planning and exploration. These methods also can be used with varying degrees of success to directly target mineral deposits at depth. We review important contributions that have been made in developing these techniques for the mining industry with focus on four main regions: Australia, Europe, Canada, and South Africa. A wide range of case studies are covered, including some that are published in the special issue accompanying this article, from surface to borehole seismic methods, as well as petrophysical data and seismic modeling of mineral deposits. At present, high-resolution 2D surveys mostly are performed in mining areas, but there is a general increasing trend in the use of 3D seismic methods, especially in mature mining camps.

show abstract

Seismic reflectivity of the Sudbury Structure North Range from borehole logs

Cited by 16 publications

References 4 publications

Timing constraints on deformation history of the Sudbury Impact Structure

Timing constraints on deformation history of the Sudbury Impact Structure

Upper-crustal seismic velocity heterogeneity as derived from a variety ofP-wave sonic logs

Seismic methods in mineral exploration and mine planning: A general overview of past and present case histories and a look into the future

Contact Info

Product

Resources

About