Open AccessSm-Nd model age of an early Proterozoic gabbro-anorthosite from the Caledonian fold belt in North-East Greenland
Author(s) -
Ole Stecher,
N Henriksen
Publication year - 1994
Publication title -
rapport
Language(s) - English
Resource type - Journals
eISSN - 2597-2944
pISSN - 0418-6559
DOI - 10.34194/rapggu.v162.8255
Subject(s) - gabbro , anorthosite , geology , geochemistry , gneiss , archean , proterozoic , crust , fold (higher order function) , petrology , plagioclase , igneous rock , paleontology , metamorphic rock , mechanical engineering , quartz , engineering , tectonics
Metamorphosed anorthositic and gabbro-anorthositic rocks are found as scattered occurrences in the basement gneisses of the Caledonian fold belt of North-East Greenland. A Tm-MD-nd model age determined on a gabbro- anorthositic sample yields a value of 2146 Ma. This model age is in agreement with the general age of crust formation in the region. The result shows that anorthosites, which are of Archaean derivation in many areas in Greenland, cannot on their own be used as an indicator of Archaean crust.