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Crustal thickness and V P/V S variations in the Grenville orogen (Ontario, Canada) from analysis of teleseismic receiver functions
Department of Earth Sciences, University of Western Ontario.
Department of Earth Sciences, University of Western Ontario.
2006 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 420, no 1-2, p. 223-238Article in journal (Refereed) Published
Abstract [en]

We have developed a simple semblance-weighted stacking technique to estimate crustal thickness and average V P/V S ratio using teleseismic receiver functions. We have applied our method to data from 32 broadband seismograph stations that cover a 700 × 400 km 2 region of the Grenville orogen, a 1.2-0.98 Ga Himalayan-scale collisional belt in eastern North America. Our seismograph network partly overlaps with Lithoprobe and other crustal refraction surveys. In 8 out of 9 cases where a crustal-refraction profile passes within 30 km of a seismograph station, the two independent crustal thickness estimates agree to within 7%. Our regional crustal-thickness model, constructed using both teleseismic and refraction observations, ranges between 34.0 and 52.4 km. Crustal-thickness trends show a strong correlation with geological belts, but do not correlate with surface topography and are far in excess of relief required to maintain local isostatic equilibrium. The thickest crust (52.4 ± 1.7 km) was found at a station located within the 1.1 Ga mid-continent (failed) rift. The Central Gneiss Belt, which contains rocks exhumed from deep levels of the crust, is characterized by V P/V S ranging from 1.78 to 1.85. In other parts of the Grenville orogen, V P/V S is found to be generally less than 1.80. The thinnest crust (34.5-37.0 km) occurs northeast of the 0.7 Ga Ottawa-Bonnechere graben and correlates with areas of high intraplate seismicity

Place, publisher, year, edition, pages
2006. Vol. 420, no 1-2, p. 223-238
Identifiers
URN: urn:nbn:se:ltu:diva-11640DOI: 10.1016/j.tecto.2006.01.023Local ID: aa78308c-a1e5-454d-b2b0-2a47555a4ff9OAI: oai:DiVA.org:ltu-11640DiVA, id: diva2:984590
Note
Upprättat; 2012; 20120924 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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