Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Crustal structure, fossil subduction, and the tectonic evolution of the Newfoundland Appalachians; evidence from a reprocessed seismic reflection survey

Arie J. van der Velden, Cees R. van Staal and Frederick A. Cook
Crustal structure, fossil subduction, and the tectonic evolution of the Newfoundland Appalachians; evidence from a reprocessed seismic reflection survey
Geological Society of America Bulletin (December 2004) 116 (11-12): 1485-1498

Abstract

Reprocessed Lithoprobe seismic reflection data across the Appalachian orogen in Newfoundland provide images of an Ordovician-Devonian collision zone that separates Laurentia from Ganderia, an accreted peri-Gondwanan microcontinent. Prominent reflectivity within Ganderian basement tapers westward and merges with reflections that project beneath the Moho, outlining a probable Ordovician to Devonian subduction zone. Reflectivity within Ganderian basement likely originates from transposed compositional layering within Cambrian-Neoproterozoic arc basement. Migmatites and other high-grade rocks of the Meelpaeg allochthon were likely extruded in the Devonian toward the northeast. The reflection Moho may have been established in the Devonian in parts of Newfoundland by partial melting of the lower crust. Reflection truncations outline a near-vertical Carboniferous strike-slip fault zone that cuts the entire crust.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 116
Serial Issue: 11-12
Title: Crustal structure, fossil subduction, and the tectonic evolution of the Newfoundland Appalachians; evidence from a reprocessed seismic reflection survey
Affiliation: University of Calgary, Department of Geology and Geophysics, Calgary, AB, Canada
Pages: 1485-1498
Published: 200412
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 92
Accession Number: 2004-085843
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Geol. Surv. Can., Contrib. No. 2003239
Illustration Description: illus. incl. sects., 3 tables, geol. sketch map
N46°30'00" - N50°00'00", W59°19'60" - W54°00'00"
Secondary Affiliation: Geological Survey of Canada, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200424
Close Modal

or Create an Account

Close Modal
Close Modal