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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes


Pub. Id: A108 (1973)

First Page: 583

Last Page: 586

Book Title: M 19: Arctic Geology

Article/Chapter: Test of Nature and Extent of Continental Drift as Provided by Study of Proterozoic Dike Swarms of Canadian Shield: Evolution of Arctic Ocean Basin

Subject Group: Geologic History and Areal Geology

Spec. Pub. Type: Memoir

Pub. Year: 1973

Author(s): W. F. Fahrig (2), E. Irving (3), G. D. Jackson (2)


The Franklin intrusions are an extensive swarm of late Hadrynian (latest Proterozoic) diabase dikes that are present in an arc from Great Bear Lake eastward to Melville Peninsula, Baffin Island, and northern Ungava Bay. They are chemically and petrologically classified as tholeiites and are probably comagmatic. Paleomagnetic pole positions and numerous whole-rock K-Ar age determinations indicate that the dikes were emplaced at low latitudes 650 m.y. ago. They intrude Hadrynian sedimentary sequences that contain features indicative of depositon under warm climatic conditions.

The Baffin dikes are subparallel with the northeast coastline of Baffin Island and with a pronounced northwest-trending fault system. Intermittent, mainly normal movement along these faults persisted from the Helikian to the Quaternary and produced a series of graben structures which may be due to the same regional tension as the dikes. Thus, Baffin Bay and Davis Strait may have begun to form as early as the late Hadrynian, and they may contain Paleozoic strata.

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