The thermotectonic development of southern Sweden during Mesozoic and Cenozoic time
Published:January 01, 2002
Charlotte Cederbom, 2002. "The thermotectonic development of southern Sweden during Mesozoic and Cenozoic time", Exhumation of the North Atlantic Margin: Timing, Mechanisms and Implications for Petroleum Exploration, A. G. Doré, J. A. Cartwright, M. S. Stoker, J. P. Turner, N. White
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Late Carboniferous-Early Mesozoic exhumation of southern Sweden has previously been traced using apatite fission-track thermochronology. In addition, the morphotectonic development of the region has been studied using geomorphology. The aim of this study is to attain further knowledge of the Mesozoic and Cenozoic thermotectonic development of southern Sweden by integrating results from these methods.
Well-dated re-exposed palaeosurfaces and sedimentary records in the surrounding areas were used as constraints in the modelling of apatite fission-track data from the Precambrian basement. The obtained modelled thermal histories suggest that southern Sweden can be divided into three main tectonic areas associated with different cooling histories. In Triassic and Jurassic time, low to moderate exhumation in the central part was accompanied by more rapid exhumation in the SE and NW. Additionally, individual block movements may have occurred in the NW. It has also been possible to estimate the heating effect of renewed Cretaceous-Paleogene burial to 20-35 °C on the west and SE coasts.
Final Cenozoic unroofing of the basement is indicated by the modelled thermal histories. Areas around the southern tip of Lake Vättern together with the SE coast experienced the most pronounced exhumation compared with the surrounding parts.
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Exhumation of the North Atlantic Margin: Timing, Mechanisms and Implications for Petroleum Exploration
Northwest Europe has undergone repeated episodes of exhumation (the exposure of formerly buried rocks) due to such factors as post-orogenic unroofing, rift-shoulder uplift, hotspot activity, compressive tectonics, eustatic sea-level change, glaciation and isostatic readjustment. The main observational legacy of this exhumation around the North Atlantic is preserved in the comparatively young (Mesozoic and Cenozoic) geological record of this region. Despite a rapid increase in the understanding of the exhumation of this area, there are still many unknowns: the relative intensity of the various phases and their geographical variation; mechanisms of uplift; primary causes of exhumation. Tied to these problems is the larger-scale question of whether the circum-North Atlantic is unique or whether its behaviour is typical for passive margins.
There have been several attempts in recent years to bring together researchers to address these questions, but these have often focused on one particular geographical area or one particular exhumation phase. Before an integrated story can emerge, disciplines that have traditionally remained apart need to come together: geomorphology and offshore seismic interpretation; Palaeogene and Neogene studies; Scandinavian and British-Irish research schools. This volume represents a first step in this direction by providing an inter-disciplinary set of studies over a wide latitudinal range of the NW European margin.
The studies presented here are based on a variety of techniques that have been employed to address the main concerns of North Atlantic exhumation history, including timing, mechanisms and the sedimentary response of the continental margin. The 25 papers presented in this volume have been arranged in four sections to reflect the highly varied approach to this subject and the commercial implications. Part 1 is concerned with exhumation mechanisms, focusing primarily on the Iceland Plume. Parts 2 and 3 present ongoing research on the continental margin record offshore Scandinavia, Britain, Ireland and the Faroes. The papers in these two parts illustrate the communication that is now occurring between the two regional research schools and the acknowledgement of a multiphase Cenozoic denudation chronology for both areas. Part 4 contains five papers describing the significant changes to the hydrocarbon systems that occur in exhumed basins, detailing the implications for hydrocarbon-bearing basins.
Exhumation of the North Atlantic Margin: Timing, Mechanisms and Implications for Petroleum Exploration is the most up-to-date and complete volume integrating all aspects of the Mesozoic-Cenozoic exhumation of North Atlantic borderlands. Itwill be of interest to those within the oil industry, geomorphologists and other workers with an interest in NW European regional geology.