An Outline of the Pre-Carboniferous Geology of Nordaustlandet

By Audun Hjelle
Bok · Engelsk · 1978

Utgitt	1978
Omfang	s. 62-77 : ill. + + 1 Geological map - Geologisk kart (Nordaustlandet - Northern and Central part - Nordre og midtre del, 1:250000, Norsk Polarinstitutt 1966)
Opplysninger	Særtrykk fra Polarforschung, 48. jahrgang, 1978, nr 1-2. - The general features of the pre-Cerbontferous geology of NE Svalbard are summarized in this paper and are based mainly on work done by four Norsk Polarinstitutt expeditions in 1957, 1965, 1976 and 1978. The supracrustal strata, which are of late Precambrian to Cambro-Ordovician age, have all undergone Caledonian metamorphism; the lowest part of the succession gene rally occurs as paragneisses, or hasb ee n more Of less migmatized. Isotopic ages suggest an orogenic episode around 530 m. y. ago. Posttectonic granites which cut the migmatites have revealed ages ot 350 to 450 m. y. Syn- to late tectonic intrusives include a range trom granite to quartz diorite; in the NE extensive gabbros and diorites are also found.
Emner	geologi svalbard