Isotopic evidence for a Precambrian metamorphic event within the Charcot Land window, East

V tj Rb-Sr, U-Pb and K-Ar analyses on rocks and minerals from a tectonic window below a Caledonian thrust f sheet in the westernmost part of the Scoresby Sund region (70°-72°N) give evidence for a Precambrian age of formation. The Charcdt Land supracrustal sequence rests on a basement that is probab...

Full description

Bibliographic Details
Main Authors: Greenland Caledonian Fold Belt, B. T. Hansen, R. H. Steiger, A. K. Higgins
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 1980
Subjects:
Charcot
Charcot Land
Scoresby
Scoresby Sund
Sund
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.513.8540
http://2dgf.dk/xpdf/bull29-03-151-160.pdf
Description
Summary:V tj Rb-Sr, U-Pb and K-Ar analyses on rocks and minerals from a tectonic window below a Caledonian thrust f sheet in the westernmost part of the Scoresby Sund region (70°-72°N) give evidence for a Precambrian age of formation. The Charcdt Land supracrustal sequence rests on a basement that is probably of Archaean development and older than at least 2100 m.y. The major regional metamorphism of the supracrustal rocks is probably not much older than the intrusion of two post-kinematic bodies, i.e. about 1840 m.y. Low-grade metamorphism in a tillite and low-grade retrogressive overprinting of the supra-crustal rocks are related to Caledonian orogenesis.

Similar Items