The geological and tectonic evolution of the Precambrian of northern Sweden; a case for basement reactivation?

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doi: 10.1016/0301-9268(84)90047-0
Authors:Witschard, Fred
Author Affiliations:Primary:
Studsvik Anal. AB, Birger Jarlsgatan, Stockholm, Sweden
Volume Title:Precambrian Research
Source:Precambrian Research, 23(3-4), p.273-315. Publisher: Elsevier, Amsterdam, International. ISSN: 0301-9268
Publication Date:1984
Note:In English. 150 refs.; illus. incl. sects., geol. sketch maps
Summary:It takes into account most of the geological, geochemical and geophysical data concerning the region. In the light of recent mapping results and radiometric age determinations. An attempt is made to trace the main petrogenetic trends of the volcanic and the plutonic rock series in order to determine which geotectonic model can best be inferred for the region. Following the Archean consolidation phase, two major tectonic episodes have been recognized: (1) a tensional episode characterized by incipient rifting which resulted in the extrusion of basic magma and in the deposition of predominantly quartzitic sediments and (2) a complex episode of reactivation of older structures and formations, corresponding to the peak of the Svecokarelian orogeny and to later consolidation. A characteristic feature of the aeromagnetic, gravimetric and Landsat maps is the profusion of circular and arcuate structures of variable magnitude and distincitiveness. The possibility that some of these are due to the process of sequential inheritance of early impact scars is discussed. [A.C.B.]
Subjects:Absolute age; Archean; Areal geology; Basement; Dates; Deformation; Diabase; Gabbros; Geochemistry; Geochronology; Granites; Greenstone; Igneous rocks; Impact features; Intrusions; Metamorphic rocks; Orogeny; Paleoproterozoic; Plutonic rocks; Precambrian; Proterozoic; Rb/Sr; Schists; Stratigraphy; Svecofennian Orogeny; Tectonics; U/Pb; Upper Precambrian; Caledonides; Europe; Scandinavia; Sweden; Western Europe; Evolution; Greenstone Group; Haparanda Suite; Kurravaara Conglomerate; Lina granite suite; Northern Sweden; Pertnite monzonite suite; Porphyry Group
Coordinates:N663000 N690000 E0240000 E0183000
Abstract Numbers:84M/4308
Record ID:1985013768
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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