Rb-Sr and U-Pb age patterns in polymetamorphic sediments from the southern part of the East

Rb-Sr analyses on sediments once believed to be late Precambrian show evidence of a middle Proterozoic metamorphic event overprinted by a Caledonian event which only partly reset the isotopic systems. U-Pb analyses on monazites support the Rb-Sr data, whereas zircons show evidence of a detrital orig...

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Bibliographic Details
Main Authors: Greenland Caledonides, Bent Tauber Hansen, Anthony K. Higgins, Marie-therese Bar
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Greenland
East Greenland
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.522.6943
http://2dgf.dk/xpdf/bull27-01-02-55-62.pdf
Description
Summary:Rb-Sr analyses on sediments once believed to be late Precambrian show evidence of a middle Proterozoic metamorphic event overprinted by a Caledonian event which only partly reset the isotopic systems. U-Pb analyses on monazites support the Rb-Sr data, whereas zircons show evidence of a detrital origin from an older source region. The age patterns support speculation of the presence of widespread early Proterozoic deposition and a significant middle Proterozoic orogenic episode within the East Greenland Caledonides.

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