Pre-Quaternary Geology of Southwest Greenland and Its Bearing on North Atlantic Correlation Problems
Published:January 01, 1969
J. H. Allaart, D. Bridgwater, N. Henriksen, 1969. "Pre-Quaternary Geology of Southwest Greenland and Its Bearing on North Atlantic Correlation Problems", North Atlantic—Geology and Continental Drift, Marshall Kay
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Two major divisions of Precambrian plutonic rocks are present in West Greenland south of 62°30′ N lat. The oldest (pre-Ketilidian) rocks, giving ages between 2,500 and 2,700 m.y., are in the north. They consist mainly of gneisses, but include amphibolite and mica-schist and contain a belt of locally migmatized supracrustal rocks (the Tartoq Group). The gneisses and the supracrustal rocks are cut by several generations of cratogenic basic dikes.
The pre-Ketilidian rocks are overlain unconformably by Ketilidian metasedimentary and metavolcanic rocks at approximately 61°15′ N lat. Southward the Ketilidian supracrustal rocks and the underlying gneisses and basic dikes are...
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North Atlantic—Geology and Continental Drift
The Gander Conference, an International Conference on Stratigraphy and Structure Bearing on the Origin of the North Atlantic Ocean, was held in Gander, Newfoundland, August 1967. The conference gave geologists familiar with the areas bordering the North Atlantic Ocean with an opportunity to present their knowledge and ideas to colleagues dealing with similar rocks and structures. This publication contains most of the papers that were presented at that conference and a few others that were prepared for the sessions.