Open AccessPreliminary Rb-Sr isotope evidence on the age and metamorphic history of the North Greenland crystalline basement
Author(s) -
Feiko Kalsbeek,
H.F Jepsen
Publication year - 1980
Publication title -
rapport
Language(s) - English
Resource type - Journals
eISSN - 2597-2944
pISSN - 0418-6559
DOI - 10.34194/rapggu.v99.7677
Subject(s) - geology , fjord , basement , gneiss , outcrop , precambrian , geochemistry , proterozoic , metamorphic rock , paleontology , geomorphology , archaeology , geography , tectonics
No outcrops of crystalline basement rocks are known in the eastem part of North Greenland, mapped in 1978 and 1979 by the Geological Survey of Greenland. The oldest rocks are sandstones of the Proterozoic Independence Fjord Group (Collinson, this report). However, ice-transported boulders of gneisses, amphibolites and granitic rocks indicate the presence of crystalline rocks under the Inland Ice, perhaps not far south of the ice margin (fig. 46). The nearest outcrops of crystalline basement in North Greenland occur at the head of Victoria Fjord, c. 250 km west of Independence Fjord (Hurst & Peel, 1979). These rocks have as yet not been mapped or studied.