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Geophysical investigations in the emerged and submerged Atlantic coastal plain. Part VIII. Grand banks and adjacent shelves

Press, Frank and Beckman, Walter (1954) Geophysical investigations in the emerged and submerged Atlantic coastal plain. Part VIII. Grand banks and adjacent shelves. Geological Society of America Bulletin, 65 (3). pp. 299-314. ISSN 0016-7606. http://resolver.caltech.edu/CaltechAUTHORS:20140924-100459375

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Abstract

A reconnaissance refraction survey was conducted on the Grand Banks, St. Pierre Banks, Cabot Strait Trough, and Banquereau. Three stations on the Grand Banks indicate sedimentary layers ranging from 2300 to 10,700 feet in thickness. The sediments are underlain by basement rocks having velocities of 16,150–18,200 ft/sec. A striking feature, existing on a profile running from St. Pierre Bank across Cabot Strait Trough to Banquereau, is the occurrence under the trough of a prism of sediments that thickens to almost 14,000 feet near the northeast margin where it is almost entirely truncated by basement rock. The sequence of subsurface layers found on the banks south and southeast of Newfoundland is not unlike that reported for the submerged shelf off the northeast coast of the United States and the banks off Nova Scotia. The seismic results and the recent results from dredging and coring operations support the hypothesis that the shelf off eastern North America is a depositional feature dating back to at least Lower Cretaceous time. The physiographic differences north and south of Cape Cod are believed to be due to erosion. The data suggest a structural origin for the Cabot Strait Trough, although the possibility of subsequent modification by glaciation is not ruled out.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/0016-7606(1954)65[299:GIITEA]2.0.CO;2 DOIArticle
http://gsabulletin.gsapubs.org/content/65/3/299PublisherArticle
http://bulletin.geoscienceworld.org/content/65/3/299PublisherArticle
Additional Information:© 1954 Geological Society of America. Manuscript received by the Secretary of the Society, January 28, 1953.
Record Number:CaltechAUTHORS:20140924-100459375
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140924-100459375
Official Citation:PRESS, F., & BECKMANN, W. (1954). GEOPHYSICAL INVESTIGATIONS IN THE EMERGED AND SUBMERGED ATLANTIC COASTAL PLAIN: PART VIII. GRAND BANKS AND ADJACENT SHELVES. Geological Society of America Bulletin, 65(3), 299-314. doi: 10.1130/0016-7606(1954)65[299:giitea]2.0.co;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49984
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:24 Sep 2014 19:46
Last Modified:13 Feb 2019 18:03

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