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Geological Introduction

Published:
January 01, 2012

Abstract

The area considered lies at three major geological boundaries. Paleogeographically, it lies at the border between the NNE-SSW-trending (all orientations are present day) Neoproterozoic to early Paleozoic continental margin of western Baltica, now exposed in the Caledonian nappes, and the contemporary WNW-ESE-trending Timanian basin, relicts of which are seen sparsely along the northern coast of Norway and Russia (Siedlecka, 1975; Siedlecka et al., 2004; Gayer and Rice, 1989). Structurally, it lies across the boundary between deformation associated with crustal shortening (thrusting) in the Scandinavian Caledonides in the west and the underlying autochthonous Baltic Shield (Gayer et al., 1987). Finally, it also lies at the border of the Scandinavian Caledonides in the west and Timanide deformation in the east (Siedlecka et al., 2004).

The Scandinavian Caledonides have been divided into an Autochthon, Lower Allochthon, Window Allochthon, Middle Allochthon, Upper Allochthon, and Uppermost Allochthon (Fig. 2). The Upper Allochthon is divided into Seve-type nappes and overlying Köli-type nappes.

Rocks including the Seve-type nappes down to the Lower Allochthon (the Baltic cover sheets and crystalline sheets of Hossack and Cooper, 1986) represent the strongly shortened Baltoscandian continental shelf, including the ocean-continent transition, overlying a late Neoproterozoic to lower Paleozoic autochthonous sedimentary sequence resting with a marked unconformity on basement rocks of the Baltic Shield. Of these units, only the Autochthon (East Finnmark Autochthon) and Lower Allochthon (Gaissa Thrust Belt), with a poorly defined parautochthonous intermediary zone, are of importance here

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Contents

GSA Field Guide

Neoproterozoic Glacial and Associated Facies in the Tanafjord-Varangerfjord Area, Finnmark, North Norway

A.H.N. Rice
A.H.N. Rice
Department of Geodynamics and Sedimentology University of Vienna Althanstrasse 14 1090 Vienna Austria
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Marc B. Edwards
Marc B. Edwards
3420 Yoakum Blvd Houston, Texas 77006 USA
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T.A. Hansen
T.A. Hansen
Talisman Energy Norge AS Verven 4 PO Box 649 Stavanger Norway
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Geological Society of America
Volume
26
ISBN electronic:
9780813756264
Publication date:
January 01, 2012

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