Archives - Page 4

  • Volume 9 cover page

    Scientific results from the deepened Lopra-1 borehole, Faroe Islands
    Vol. 9 (2006)

    Editors: James A. Chalmers and Regin Waagstein

    The Faroe Islands in the northern North Altantic consist primarily of Palaeogene eruptive volcanic rocks. Two research boreholes were drilled in 1980 and 1981 on the islands, the deeper of which, Lopra-1, extended 2 km into the unexposed part of the volcanic succession.

    Exploration for hydrocarbons in the area to the south-east of the Faroe Islands and leakage of gas from the still-open Lopra-1 borehole suggested the presence of a sedimentary section below the volcanics that might contain hydrocarbons. VSP (Vertical Seismic Profiling) studies from the Lopra-1 borehole indicated the presence of seismic reflections from below its final depth that might indicate the base of the volcanic series underlain by sediments.

    These observations motivated an industry consortium to drill an extension to the Lopra-1 borehole in 1996 that, including a side-track, reached a final depth of 3565 m. The extension penetrated a thick sequence of previously unknown volcanic rocks, but not pre-volcanic siliciclastic sediments as hoped.

    This bulletin presents many new scientific studies of both the extended and original Lopra-1/1A boreholes, in some cases combined with regional studies from elsewhere in the Faroe Islands.


  • Volume 8 cover page

    Structural analysis of the Rubjerg Knude Glaciotectonic Complex, Vendsyssel, northern Denmark
    Vol. 8 (2005)

    Stig A. Schack Pedersen

    The coastal cliff (99 m high at its highest point) at Rubjerg Knude on the west coast of Vendsyssel, northern Denmark. The lower two-thirds of the cliff, beneath the prominent dark sub-horizontal surface, forms part of the cross-section through the Rubjerg Knude Glaciotectonic Complex displaying imbricated thrust sheets composed of the Lønstrup Klint Formation (bluish-grey colour) and the overlying Rubjerg Knude Formation (yellow colour), both of Late Weichselian age. The thrust sheets are truncated by a glaciotectonic unconformity (the prominent surface), upon which the Kattegat Till Formation is only preserved as a boulder bed due to subsequent aeolian erosion of the till matrix. The upper third of the cliff comprises recent aeolian dune sands that have accr eted over the last 100 years and now encroach on the Rubjerg Knude lighthouse, the top of which is just visible above the clifftop. 

  • Volume 7 cover page

    The Review of Survey activities 2004
    Vol. 7 (2005)

    Editors: Martin Sønderholm & A.K. Higgins

    The Review of Survey activities presents a selection of 18 papers reflecting the wide spectrum of activities of the Geological Survey of Denmark and Greenland, from the microbial to the plate tectonic level.

    Activities in Denmark: The Survey's activities in Denmark are documented by 11 papers. The main themes are petroleum- and groundwater-related topics and Quaternary geology but neotectonics of the Baltic Shield and new methods in provenance studies of sandstones are also touched upon.

    Activities in Greenland: The Survey's activities in Greenland and the North Atlantic are covered by six articles focusing on climate research, the mineral potential of the Precambrian basement terranes in West Greenland and on the possibility of exploiting dimension stones.

    Other countries: During 2004, the Survey carried out work in more than 20 countries outside Denmark, Greenland and the Faroe Islands. In this report a project on developing small-scale mining in Mongolia and Kyrgyzstan is described.



  • Volume 6 cover page

    East Greenland Caledonides, stratigraphy, structure and geochronology
    Vol. 6 (2004)

    Edited by A.K. Higgins and Feiko Kalsbek

    The Caledonian orogen of East Greenland has been intensely studied over the last 30 years during a series of regional mapping expeditions. The orogen that extends between 70°N and 81°30´N in East Greenland, is now completely covered by five geological map sheets in the Survey's regional 1:500 000 series.

    This collection of six papers includes two on aspects of Neoproterozoic and Lower Palaeozoic stratigraphy. Two other papers describe structural studies, one the geometry of the thin-skinned thrust belt in Kronprins Christian Land and the second the significance of the discovery of the Eleonore Sø and Målebjerg foreland windows. The remaining two papers report the results of geochronological studies.



  • Volume 5 cover page

    The Jurassic of North-East Greenland
    Vol. 5 (2004)

    Edited by L. Stemmerik and S. Stouge

    The Jurassic rift succession of East Greenland has been intensely studied over the last 25 years, particularly within the main outcrop areas of Jameson Land and Wollaston Forland. The more isolated and poorly known outcrops on Traill Ø, Hold with Hope, Hochstetter Forland and Store Koldewey were investigated in the late 1980s and mid-1990s in order to develop a better regional understanding of the Jurassic in eastern Greenland.

    This collection of seven papers focuses on stratigraphic and depositional aspects of the Jurassic at these localities. Comprehensive descriptions of the Jurassic on Hold with Hope and south-eastern Traill Ø are accompanied by papers covering fluvial deposits and new ammonite collections from the Middle Jurassic of Traill Ø. The bulletin is concluded by studies of the dinoflagellate cyst stratigraphy of the Middle and Upper Jurassic of Hold with Hope, Hochstetter Forland and Store Koldewey.



  • Volume 4 cover page

    Review of Survey activities 2003
    Vol. 4 (2004)

    Editors: Martin Sønderholm & A.K. Higgins

    The Review of Survey activities presents a selection of 23 papers reflecting the wide spectrum of activities of the Geological Survey of Denmark and Greenland, from the microbial to the plate tectonic level.

    The Survey's activities in Denmark are documented by ten papers. These include discussion of the complex history of hydrocarbon filling of Danish chalk fields, the possibilities for CO2 storage in Denmark and other European countries, and the geothermal potential of Denmark. Also covered is the search for new aquifers, several aspects of groundwater vulnerability to pesticide leaching, the various cutting-edge technologies used for groundwater analysis, the environmental history of Danish lakes and the distribution and transport of sediments along the North Sea coast of Denmark. One paper deals with the management of environmental data using the Internet.

    The Survey's activities in Greenland and around the Faroe Islands are reported in ten articles. In Greenland, activities in 2003 were focused on West Greenland. Papers include a documentation of evidence for possible Jurassic source rocks off West Greenland, and reports on a mapping campaign in the Archaean province of central West Greenland that included exploration for gold and diamonds. The influence of climate change on the Greenland Inland Ice and its outlet glaciers is presented in two papers. On and around the Faroe Islands, seismic properties of basalts have been studied in detail and a geohazard study has been completed in Faroese offshore areas. The investigations relating to possible extended continental shelf claims off Greenland and the Faroe Islands that were initiated in 2003 are also outlined.

    The Survey's international activities, funded by the European Union and various national and international funds for aid to developing countries, are the subject of three papers. The PROTECT project aiming at prediction of chalk cliff collapse is reported on, as well as two developing aid projects in cooperation with the Geological Survey Department of Ghana and the Vietnam Petroleum Institute.



  • Volume 3 cover page

    ​Late Quaternary environmental changes recorded in the Danish marine molluscan faunas
    Vol. 3 (2004)

    K. Strand Petersen

    The main result of this work was the comparison between the fossil faunas and the mollusc faunas now living before our eyes using the C.G.J. Petersen bottom community concept step by step in the seven stages from the Eemian to the Subatlantic within the seven regions in the Danish realm.

    It appears that the differences in facies made the difference between the regions and that the more temperate Eemian marine fauna was only connected with the shallow water environment.

    The climatic changes recorded in the mollusc fauna have given a clear record as far as the main trends are concerned – the interglacial/glacial cycle, however, the climatic changes during the Holocene were small.


  • Volume 2 cover page

    Fish otoliths from the Paleocene of Denmark
    Vol. 2 (2003)

    Werner Schwarzhans

    The microscopic otoliths (granule of calcium carbonate in vertebrate inner ear) are becoming important for biostratigraphical evaluations in the Cenozoic of Europe. Recently, Denmark has proven to be an important area for the investigation of otoliths.

    This bulletin presents a comprehensive account on Paleocene otoliths from eastern Denmark and recorded from respectively the Fakse Quarry (Danian), Gemmas Allé (Selandian) Sundkrogen (Selandian), Kongedybet (Selandian) and Vestre Gasværk (Selandian). The Selandian locations are all in the vicinity of Copenhagen, Denmark, but today they are covered. The described otolith material from these localities is therefore obtained from older collections.

    The study describes and reinterprets the classic works of Koken (1891) and Roedel (1930) and new otolith based genera and species are introduced. The evolutionary history of the taxa is investigated and the palaeoecological significance and the palaeobiographical distribution are evaluated. The potential stratigraphical value of the taxa is investigated. Affinities to other otolith bearing locations in Europe and Greenland are discussed.


  • Volume 1 cover page

    The Jurassic of Denmark and Greenland
    Vol. 1 (2003)

    Editors: Jon R. Ineson and Finn Surlyk

    The Jurassic rocks of Denmark and East Greenland record the evolution of two discrete portions of the Mesozoic rift complex, now separated by the North Atlantic Ocean. The Jurassic of Denmark and adjacent areas occurs mostly in the subsurface and research has thus focussed on the wealth of borehole and reflection seismic data resulting from over thirty years of hydrorcarbon exploration. The Jurassic of East Greenland, in contrast, is exposed in spectacular cliffs along fjords and mountainsides and has come to be regarded as a unique 'field laboratory', particularly amongst those working on the Norwegian shelf - the conjugate margin of East Greenland.

    This bulletin contains 28 articles, preceded by a short overview article, presenting the results of a period of intensive research into the Jurassic in the late 1980s and 1990s. Following detailed chronostratigraphic and biostratigraphic reviews of the Jurassic of Northwest Europe, the successions of Denmark and East Greenland are subjected to a range of stratigraphic, sedimentological, structural and geochemical studies that together provide the basis for a detailed comparison of the Jurassic evolution of the East Greenland and Danish sedimentary basins.

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