Cordilleran Intermontane thermotectonic history and implications for neotectonic structure and petroleum systems, British Columbia, Canada

Majorowicz, Jacek; Osadetz, Kirk G.

doi:10.1007/s00531-007-0215-x

Cited by 5 publications

(2 citation statements)

References 68 publications

(92 reference statements)

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“…On the other hand, such relationship was theoretically predicted to exist by Bodri and Bodri (1985) for the general case and by Hyndman and Lewis (1999), who included elevation into the equation. It was confirmed in a study of the Canadian Cordilleran region by Majorowicz and Osadetz (2008;their Fig. 6).…”

Section: Introductionmentioning

confidence: 55%

Terrestrial heat flow versus crustal thickness and topography – European continental study

Majorowicz¹,

Grad

Polkowski

2019

ijthfa

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The relation between heat ﬂow, topography and Moho depth for recent maps of Europe is presented. Newest heat ﬂow map of Europe is based on updated database of uncorrected heat ﬂow values to which paleoclimatic correction is applied across the continental Europe (Majorowicz and Wybraniec 2010). Correction is depth dependent due to a diﬀusive thermal transfer of the surface temperature forcing, of which glacial–interglacial history has the largest impact. This explains some very low uncorrected heat ﬂow values of 20–30 mW/m2in shallow boreholes in the shields, shallow basin areas of the cratons, and in other areas including orogenic belts where heat ﬂow was likely underestimated due to small depth of the temperature logs. New integrated map of the European Moho depth (Grad et al 2009) is the ﬁrst high resolution digital map for European plate, which is understood as an area from Ural Mountains in the east to mid-Atlantic ridge in the west, and Mediterranean Sea in the south to Spitsbergen and Barents Sea in Arctic, in the north. For correlation we used the following: onshore heat ﬂow density data with palaeoclimatic correction (5318 locations), topography map (30x30 arc seconds, by Danielson and Gesch 2011) and Moho map by Grad et al (2009), providing longitude, latitude and Moho depth (with resolution of 0.1 degree). Analysis was limited to locations for which datasets were available. The area of continental Europe has been divided into two large domains: Precambrian East European craton and Palaeozoic Platform of the West Europe. In addition, two smaller areas were considered, corresponding to Scandinavian Caledonides and Anatolia. The results obtained reveal significantly diﬀerent correlations between Moho depth, elevation and heat ﬂow for these regions. For each region detailed analysis of these relations in diﬀerent elevation ranges are presented. In general, it is observed that Moho depth is more signiﬁcant for heat flow than elevation. Depending on the region and elevation range, heat flow value is up to two times larger than Moho depth, while relation of heat flow to elevation has much more variability.

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Section: Introductionmentioning

confidence: 55%

Terrestrial heat flow versus crustal thickness and topography – European continental study

Majorowicz¹,

Grad

Polkowski

2019

ijthfa

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“…1). This area comprises a collage of oceanic and microcontinental terranes accreted to North America in the early Mesozoic (Monger et al 1972;Monger and Nokleberg 1996;Majorowicz and Osadetz 2008;Riddell 2011). The sedimentary basins beneath the Nechako-Chilcotin plateau extend over about 69 000 km 2 .…”

Section: Introductionmentioning

confidence: 99%

Mapping crustal structure of the Nechako–Chilcotin plateau using teleseismic receiver function analysis^,

et al. 2014

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This paper presents results of a passive-source seismic mapping study in the Nechako-Chilcotin plateau of central British Columbia, with the ultimate goal of contributing to assessments of hydrocarbon and mineral potential of the region. For the present study, an array of nine seismic stations was deployed in 2006-2007 to sample a wide area of the Nechako-Chilcotin plateau. The specific goal was to map the thickness of the sediments and volcanic cover, and the overall crustal thickness and structural geometry beneath the study area. This study utilizes recordings of about 40 distant earthquakes from 2006 to 2008 to calculate receiver functions, and constructs S-wave velocity models for each station using the Neighbourhood Algorithm inversion. The surface sediments are found to range in thickness from about 0.8 to 2.7 km, and the underlying volcanic layer from 1.8 to 4.7 km. Both sediments and volcanic cover are thickest in the central portion of the study area. The crustal thickness ranges from 22 to 36 km, with an average crustal thickness of about 30-34 km. A consistent feature observed in this study is a low-velocity zone at the base of the crust. This study complements other recent studies in this area, including active-source seismic studies and magnetotelluric measurements, by providing site-specific images of the crustal structure down to the Moho and detailed constraints on the S-wave velocity structure.Résumé : Cet article présente les résultats d'une étude de cartographie sismique, de sources passives, dans le plateau de Nechako-Chilcotin, au centre de la Colombie-Britannique; le but ultime de l'étude est de contribuer aux évaluations du potentiel d'hydrocarbures et de minéraux de la région. Pour cette étude, un réseau de neuf stations sismiques a été déployé en 2006-2007 pour échantillonner un vaste secteur du plateau de Nechako-Chilcotin. Le but spécifique était de cartographier l'épaisseur des sédiments et de la couverture volcanique, ainsi que l'épaisseur en général de la croûte et sa structure géométrique sous le secteur à l'étude. L'étude utilise des enregistrements d'environ 40 séismes éloignés entre 2006 et 2008 pour calculer les fonctions de réception; elle construit des modèles de vitesse pour l'onde S pour chaque station au moyen de l'inversion de l'algorithme de voisinage. Les sédiments à la surface ont une épaisseur de 0,8 à 2,7 km et celle de la couche volcanique sous-jacente est de 1,8 à 4,7 km. Les sédiments et la couverture volcanique atteignent leur épaisseur maximale dans la portion centrale du secteur à l'étude. L'épaisseur de la croûte varie de 22 à 36 km, avec une épaisseur moyenne d'environ 30 à 34 km. Une caractéristique constante observée dans cette étude est la zone à faible vitesse à la base de la croûte. La présente étude s'ajoute aux autres études récentes dans ce secteur, dont les études sismiques de sources actives et les mesures magnétotelluriques; elle fournit des images, spécifiques aux sites, de la structure de la croûte jusqu'à la profondeur du Moho, et encadre, de ma...

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Near-surface and crustal-scale images of the Nechako basin, British Columbia, Canada, from magnetotelluric investigations¹This article is one of a series of papers published in this Special Issue on the theme of New insights in Cordilleran Intermontane geoscience: reducing exploration risk in the mountain pine beetle-affected area, British Columbia.²Geological Survey of Canada, GSC Contribution No.: 20100129.

Spratt¹,

Craven

2011

Can. J. Earth Sci.

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Two-dimensional (2-D) models of audio and broadband magnetotelluric (MT) data collected throughout the southern Nechako basin in south–central British Columbia, Canada, provide electrical resistivity images of the Cretaceous to Oligocene volcanic and sedimentary packages and underlying crustal-scale features. Analysis of distortion effects and structural dimensionality indicate that the MT responses are primarily one-dimensional (1-D) at periods less than 0.1 s. Departures from a 1-D response occur with maximum phase differences occurring between 0.1 and 10 s. The upper crustal resistivity models reveal a low resistivity layer at near surface depths, interpreted as Chilcotin basalts, that blankets portions of the region to depths less than 50 m, but locally thicken up to 200 m. Cretaceous sedimentary units (those showing the highest potential for hydrocarbons) are characterized by moderately low resistivities that are laterally variable. More uniform, lower resistivities appear to be associated with the Eocene volcaniclastic groups, suggesting that the MT method can distinguish between these units and may be useful in targeting areas that are more prospective for hydrocarbon exploration. In general midcrustal resistivity values are high, consistent with values of typical volcanic terranes; however, a low-resistivity zone is identified at 8–10 km depth that correlates closely with the location of seismic reflectors as well as recent microseismic activity. This low-resistivity zone is interpreted as a midcrustal reservoir of magma, the top of which marks the upper limit of fluids migrating from lower crust depths. Additionally, several crustal-scale faults are imaged.

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Cordilleran Intermontane thermotectonic history and implications for neotectonic structure and petroleum systems, British Columbia, Canada

Cited by 5 publications

References 68 publications

Terrestrial heat flow versus crustal thickness and topography – European continental study

Terrestrial heat flow versus crustal thickness and topography – European continental study

Mapping crustal structure of the Nechako–Chilcotin plateau using teleseismic receiver function analysis^,

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Cordilleran Intermontane thermotectonic history and implications for neotectonic structure and petroleum systems, British Columbia, Canada

Cited by 5 publications

References 68 publications

Terrestrial heat flow versus crustal thickness and topography – European continental study

Terrestrial heat flow versus crustal thickness and topography – European continental study

Mapping crustal structure of the Nechako–Chilcotin plateau using teleseismic receiver function analysis,

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Mapping crustal structure of the Nechako–Chilcotin plateau using teleseismic receiver function analysis^,