Interpretation of a seismic profile across the continental margin off British Columbia

1982 ◽  
Author(s):  
D. A. Waldron ◽  
R. M. Clowes
Keyword(s):  
British Columbia ◽  
Continental Margin ◽  
Seismic Profile

Crustal velocity structure of the southern Nechako basin, British Columbia, from wide-angle seismic traveltime inversion1This 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.

2011 ◽  
Vol 48 (6) ◽  
pp. 1050-1063 ◽  
Author(s):  
A.L. Stephenson ◽  
G.D. Spence ◽  
K. Wang ◽  
J.A. Hole ◽  
K.C. Miller ◽  
...  
Keyword(s):  
British Columbia ◽  
Mountain Pine Beetle ◽  
Velocity Structure ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Velocity Model ◽  
Seismic Profile ◽  
Wide Angle ◽  
Seismic Velocities ◽  
Coast Mountains

In the BATHOLITHSonland seismic project, a refraction – wide-angle reflection survey was shot in 2009 across the Coast Mountains and Interior Plateau of central British Columbia. Part of the seismic profile crossed the Nechako Basin, a Jurassic–Cretaceous basin with potential for hydrocarbons within sedimentary strata that underlies widespread volcanic rocks. Along this 205 km-long line segment, eight large explosive shots were fired into 980 seismometers. Forward and inverse modelling of the traveltime data were conducted with two independent methods: ray-tracing based modelling of first and secondary arrivals, and a higher resolution wavefront-based first-arrival seismic tomography. Material with velocities less than 5.0 km/s is interpreted as sedimentary rocks of the Nechako Basin, while velocities from 5.0–6.0 km/s may correspond to interlayered sedimentary and volcanic rocks. The greatest thickness of sedimentary rocks in the basin is found in the central 110 km of the profile. Two sub-basins were identified in this region, with widths of 20–50 km and maximum sedimentary depths of 2.5 and 3.3 km. Such features are well-defined in the velocity model, since resolution tests indicate that features with widths greater than ∼13 km are reliable. Beneath the sedimentary rocks, seismic velocities increase more slowly with depth — from 6.0 km/s just below the basin to 6.3 km/s at ∼17 km in depth, and then to 6.8–7.0 km/s at the base of the crust. The Moho is found at a depth of 33.5–35 km beneath the profile, and mantle velocities are high at 8.05–8.10 km/s.

Silurian hexactinellid sponges from northern British Columbia, Canada

1998 ◽  
Vol 72 (2) ◽  
pp. 202-220 ◽  
Author(s):  
J. Keith Rigby ◽  
Joanne L. Nelson ◽  
B. S. Norford
Keyword(s):  
British Columbia ◽  
New Species ◽  
Black Shale ◽  
Continental Margin ◽  
Early Paleozoic ◽  
Hexactinellid Sponge ◽  
Hexactinellid Sponges

Faunules of largely hexactinellid sponges have been collected from siltstones of Early Silurian Wenlock or latest Landovery age within the upper Road River Group from northern British Columbia. The assemblages include the new species: Protospongia columbiana, Hexatractiella pseudonevadensis and Cyathophycus akiensis. Other taxa described include the hexactinellids Protospongia conica Rigby and Harris, 1979, Hexatractiella nevadensis (Rigby and Stuart, 1988), Diagoniella sp., Gabelia pedunculus? Rigby and Murphy, 1983, and a specimen of the monaxonid demosponge Wareiella typicala Rigby and Harris, 1979. Also included is a fragment of what must have been a steeply obconical-cylindrical hexactinellid sponge of uncertain taxonomy; it has a skeleton of robust hexactines in an unquadruled net, above a root-tuft of 10-20 spicules. Other sponge impressions include small circular clusters of hexactines with radiating, to basketlike patterns and somewhat similar, isolated and dissociated, long probably roof tuft spicules and possible basal root tuft rosettes of monaxons. The faunules are similar to other outer continental margin, black shale, sponge assemblages of the Early Paleozoic Era, and include elements previously described from northern British Columbia and central Nevada.

Deep structure and structural inversion along the central California Continental Margin from edge seismic profile RU-3

1991 ◽  
Vol 96 (B4) ◽  
pp. 6459-6473 ◽  
Author(s):  
K. D. McIntosh ◽  
D. L. Reed ◽  
E. A. Silver ◽  
A. S. Meltzer
Keyword(s):  
Continental Margin ◽  
Deep Structure ◽  
Seismic Profile ◽  
Central California ◽  
Structural Inversion

scholarly journals Structure of the Continental Margin West of Vancouver Island, British Columbia

1970 ◽  
Author(s):  
S M Barr ◽  
J W Murray
Keyword(s):  
British Columbia ◽  
Continental Margin ◽  
Vancouver Island

Upper Proterozoic 'Limestone Unit', Northern Dogtooth Mountains, British Columbia

1973 ◽  
Vol 10 (2) ◽  
pp. 292-305 ◽  
Author(s):  
T. P. Poulton
Keyword(s):  
British Columbia ◽  
Sea Level ◽  
Continental Margin ◽  
Sea Level Fluctuations ◽  
Metasedimentary Rocks ◽  
Upper Proterozoic ◽  
Clastic Sediments ◽  
Carbonate Deposition ◽  
Stratigraphic Position

The Upper Proterozoic 'Limestone Unit' of the Horsethief Creek Group in the northern Dogtooth Mountains consists of deformed sedimentary and metasedimentary rocks with complex depositional and erosional relationships. They are interpreted to represent a westwardly prograding terrigenous and carbonate wedge in a continental margin situation. Shoaling resulted in differential carbonate deposition on top of a largely pelitic succession. Sea level fluctuations produced a complex unit characterized by alternating erosion and sedimentation, in different fades from east to west. This was succeeded by terrigenous clastic sediments with easterly or southeasterly provenance. The last recognizable events produced a widespread carbonate and sandstone blanket.A carbonate unit of similar stratigraphic position occurs in several locations north–northwest of the Dogtooth Mountains, approximately along a line paralleling the trend of Phanerozoic fades belts.

Structurally controlled hydrocarbon seeps on a glaciated continental margin, Hecate Strait, offshore British Columbia

2008 ◽  
Vol 252 (3-4) ◽  
pp. 193-206 ◽  
Author(s):  
E.J. Halliday ◽  
J.V. Barrie ◽  
N.R. Chapman ◽  
K.M.M. Rohr
Keyword(s):  
British Columbia ◽  
Continental Margin ◽  
Hydrocarbon Seeps

Sedimentation and Tectonics of Pacific Continental Margin of British Columbia: ABSTRACT

AAPG Bulletin ◽  
1974 ◽  
Vol 58 ◽  
Author(s):  
D. L. Tiffin, B. E. B. Cameron
Keyword(s):  
British Columbia ◽  
Continental Margin

INTEGRATED GEOPHYSICAL RESEARCH IN THE MIDDLE-NORTHERN CONTINENTAL MARGIN OF THE SOUTH CHINA SEA BASED ON WIDE-ANGLE SEISMIC PROFILE OBS2006-3

2013 ◽  
Vol 33 (6) ◽  
pp. 81
Author(s):  
Bin XUE ◽  
Aiguo RUAN ◽  
Jinyao GAO ◽  
Yuanming GUO ◽  
Yueping DING ◽  
...  
Keyword(s):  
South China Sea ◽  
Continental Margin ◽  
South China ◽  
Seismic Profile ◽  
The South China Sea ◽  
Wide Angle ◽  
The South ◽  
Geophysical Research ◽  
China Sea
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