Skip to Main Content
Book Chapter

North American Continent-Ocean Transects Program Transect D4: Rifted Continental Margin Off Labrador

By
C. E. Keen
C. E. Keen
Geological Survey of Canada, Atlantic Geoscience Centre, Bedford Institute of Oceanography, Dartmouth, Nova Scotia B2Y 4A2
Search for other works by this author on:
R. T. Haworth
R. T. Haworth
Geological Survey of Canada, Atlantic Geoscience Centre, Bedford Institute of Oceanography, Dartmouth, Nova Scotia B2Y 4A2
Search for other works by this author on:
Published:
January 01, 1985

Abstract

The Labrador margin is the result of continental break-up between Greenland and North America in Late Cretaceous time. This margin formed by rifting of Precambrian Shield rocks (Fig. 1). Four Precambrian Shield Structural Provinces are represented on the geological map: Nain, Makkovik, Churchill and Grenville Provinces. The Nain Province (Taylor, 1972; Umpleby, 1979) probably extends offshore beneath the region of the D4 Transect. It consistsprimarily of Archean rocks and is older than either the Churchill Province to the south and west or the Grenville Province to the south. South of the Nain Province, the Makkovik Province was affected by Hudsonian (1600 Ma) deformation and metamorphism, which characterizes much of the nearby Churchill Province. The Grenville Front separates the older rocks of the Churchill and Makkovik Provinces from the younger Grenville Province (1000 Ma or less). The latter may represent an overthrust orogenic belt (Wynne-Edwards, 1972).

The Paleozoic history of the region is not well known. Paleozoic rocks are virtually absent from the mainland. Thin Paleozoic sediments have been sampled locally in the bottom of deep boreholes in the continental shelf (Umpleby, 1979). This may reflect the presence of a Paleozoic epicontinental seaway in the region, but its tectonic significance and extent are unknown. No Paleozoic rocks were sampled near the D4 Transect.

You do not currently have access to this article.

Figures & Tables

Contents

DNAG, Continent-Ocean Transect Series

D-4 Rifted continental margin off Labrador

C. E. Keen
C. E. Keen
Search for other works by this author on:
R. T. Haworth
R. T. Haworth
Search for other works by this author on:
Geological Society of America
Volume
4
ISBN electronic:
9780813754352
Publication date:
January 01, 1985

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal