2,726 research outputs found
Late Cretaceous basin inversion in the Kattegat – Skagerrak segment, Sorgenfrei – Tornquist Zone, Denmark, and Mesozoic – Cenozoic crustal tectonics of the eastern North Sea Basin
No full textLate Cretaceous basin inversion in the Kattegat – Skagerrak segment, Sorgenfrei – Tornquist Zone, Denmark, and Mesozoic – Cenozoic crustal tectonics of the eastern North Sea BasinOle Graversen, Department of Geosciences and Natural Resource Management, Section for Geology, University of Copenhagen, Denmark, [email protected]. The Sorgenfrei – Tornquist Zone is a NW-SE trending, 50-100 km wide fault zone that cut off the East North Sea Block (ENSB), i.e. the Mesozoic basement of the Eastern North Sea Basin, from the Baltica Palaeozoic platform. The break was established in the Triassic, where the ENSB was established as the hangingwall block in the Kattegat area; by contrast, the Baltica platform develloped as the hangingwall block in the Fjerritslev halfgraben to the northwest (1). In the Kattegat area, the Triassic faulting established a staircase fault block trajectory with downfaulting towards the southwest into the Danish Basin. In the Jurassic – Early Cretaceous, the Kattegat segment changed into an asymmetric, northeast dipping graben, the Kattegat Graben. In the Late Cretaceous, maximum subsidence returned to the southwest into the Danish Basin, while the Kattegat Graben was inverted during backward tilt of the graben block. The ENSB formed the northeast flank of the Central North Sea Dome (2). The Jurassic – Cenozoic structural evolution of the ENSB was governed by the rise and fall of the Central Graben rift dome: 1) synrift rise in the Jurassic – Early Cretaceous, 2) Late Cretaceous transition phase with collapse of the Central Graben rift, 3) Cenozoic postrift subsidence (3). A model of the Mesozoic crustal tectonics associated with the ENSB illustrates the interrelationship between the evolution of the Kattegat – Skagerrak segment and the Central Graben Dome across the eastern North Sea Basin (4).References(1) Vejbæk, O.V. 1997: Dybe strukturer i danske sedimentære bassiner. Geologisk Tidsskrift 4, 1-31. (2) Ziegler, P.A. 1990: Geologcal Atlas of Western and Central Europe, Shell Internationale Petroleum Maatschappij B.V.(3) Graversen, O. 2006: The Jurassic-Cretaceous North Sea Rift Dome and associated basin evolution. American Association of Petroleum Geologists, Search and Discovery Article #30040. (4) Graversen, O. 2002: A structural transect between the central North Sea Dome and the South Swedish Dome: middle Jurassic–Quaternary uplift–subdidence reversal and exhumation across the eastern North Sea Basin.Geological Society, London, Special Publications 196, 67-83.<br/
Mesozoic basin inversion governed by crustal extension in the Bornholm area, Sorgenfrei-Tornquist Zone, Denmark
No full textMesozoic basin inversion governed by crustal extension in the Bornholm area, Sorgenfrei-Tornquist Zone, DenmarkOle Graversen, Department of Geosciences and Natural Resource Management, Section for Geology, University of Copenhagen, [email protected] inversion describes the deformation of asymmetric grabens characterized by folding and thrusting, i.e. horizontal shortening, associated with uplift of the sedimentary graben fill above regional (1). The compressive stress field has been interpreted in a plate tectonic concept as a result of continent-continent collision that established a compressive stress field in the orogenic foreland (2, 3). However, structural analysis of basin inversion in the Sorgenfrei – Tornquist Zone illustrates, that basin inversion was the result of superposition of asymmetric extensional fault basins dipping in opposite directions. The evolution of the graben basins, took place during successive extensional tectonic regimes separated by stillstand intervals. During subsidence of the superposed, extensional basin, the primary basin was tilted backward, and the basin was inverted during local compression between the primary footwall blocks.The Mesozoic fault block pattern of the Bornholm area illustrates, that the NW-SE trending Sorgenfrei – Tornquist Zone was extended in two directions: The main extension was in a NE-SW direction across the strike of the fault zone, and a secondary NW-SE extension along the fault zone trend. Based on the changing graben activity, the Mesozoic has been divided into Triassic, Jurassic – Early Cretaceous and Late Cretaceous extensional tectonic regimes. Graben subsidence started in the Triassic, and basin inversion was active in the Jurassic – Early Cretaceous and again in the Late Cretaceous (4, 5). The tectonic regimes were separated by turnover intervals characterized by only minor tectonic activity in the late Late Triassic and the early Late Cretaceous. References(1) Ziegler, P.A. 1987: Compressional intra-plate deformations in the Alpine foreland – an introduction. Tectonophysics 137, 1-5. (2) Ziegler, P.A. 1987: Late Cretaceous and Cenozoic intra-plate compressional deformations in the Alpine foreland – a geodynamic model. Tectonophysics 137, 389-420.(3) Kley, J. & Voigt, T. 2008: Late Cretaceous intraplate thrusting in central Europe: Effect of Africa-Iberia-Europe convergence, not Alpine collision. Geology 36, 839-842. (4) Graversen, O. 2004: Upper Triassic–Lower Cretaceous seismic sequence stratigraphy and basin tectonics at Bornholm, Denmark, Tornquist Zone, NW Europe. Marine and Petroleum Geology 21, 579–612.(5) Graversen, O. 2004: Upper Triassic – Cretaceous stratigraphy and structural inversion offshore SW Bornholm, Tornquist Zone, Denmark. Bulletin of the Geological Society of Denmark 51, 111–136
Ole Miss Faculty and Staff Retirees Invited to Presentation
No full textLocal historian and author Jack Mayfield to speak at Inn at Ole Mis
Ole Miss Faculty and Staff Retirees Invited to Presentation
No full textLocal historian and author Jack Mayfield to speak at Inn at Ole Mis
Coping in Nordic Peripheries - on the Spatial Production of Societies
No full textIn many traditional approaches the notion of “society” has been taken for given as a territorial container of modern society per se, and regional development was only a question of how to organise and distribute within societies. However, increasingly globalisation, flows and networks across borders have been seen as the new dominant forces of the 21st century, and traditional approaches to regional development are seen as trapped in territorial understandings. The paper seeks to develop a third position that highlights the constitutive forces of spatial practices to the development of modernity in Nordic peripheries. Hence, the spatial practices inherent in coping strategies, regional policies, planning and other aspects of regional development are interpreted not as effects or consequences of social orders, but as producers of social orders. Specific focus is given to the constitutive role of the territorial orders of municipalities and the protestant church in the formation of, often surprising, modern orders in Nordic peripheries in the 20th century. The paper draws on and develops empirical and theoretical insights from the UNESCO MOST Circumpolar Coping Processes Project (co-ordinated by the author, see www.unesco.org/most/p91.htm and www.uit.no/MostCCPP).
A structural transect between the central North Sea Dome and the South Swedish Dome: Middle Jurassic – Quaternary uplift/subsidence reversal and exhumation across the eastern North Sea Basin
No full textAbstract: The Jurassic-Cenozoic structural evolution of the eastern North Sea Basin is influenced by the central North Sea Dome, the Danish Megablock, the Tornquist Zone and the South Swedish Dome. The central North Sea Dome isa composite dome comprising the Triple Junction Dome, the Central Graben Dome and the Friesland Dome. The Danish Megablock, newly recognized here, is a first-order tectonic element between the Central Graben and the Tornquist Zone. In Jurassic-Cretaceous time it was tilted towards the east during uplift of the Central Graben Dome, whereas the movement was reversed uring the Cenozoic post-rift subsidence. Contemporaneous with the westward tilting of the Danish Megablock, the South Swedish Dome was uplifted to the east. The uplift-subsidence reversal across the eastern North Sea Basin links the collapse of the Central Graben Dome and the tilt reversal of the Danish Megablock with the uplift of the South Swedish Dome. The uplift followed by subsidence probably involved mass flow in the asthenosphere to account for the observed balance between post-rift subsidence and marginal uplift. The model explains the uplift of both the South Swedish Dome and southern England as the result of Cenozoic post-rift subsidence of the Mesozoic Central Graben Dome
The Jurassic-Cretaceous North Sea Rift Dome and Associated Basin Evolution* By
No full textThe Middle-Late Jurassic North Sea Rift Dome was established by recognition of the near base Middle Jurassic erosional unconformity in the central North Sea. The distribution and range of the overlying hiatus illustrates the gross outline and duration of the exposed dome. The presence of Upper Jurassic deposits both in the central rifts and in the marginal troughs in the Sole Pit Basin and along the Tornquist Zone documents that the dome continued across the entire North Sea Basin. In addition, thick Lower Jurassic Series preserved beyond the erosional hiatus along the dome margins, suggests that the dome may have been initiated already in the Early Jurassic. The dome raised above sea level during the Middle Jurassic, and deflation of the dome associated with rifting took place during the Late Jurassic. Lower Cretaceous sequences onlap the Central Graben footwall blocks, and this relationship has been interpreted to illustrate that post-rift basin infilling was initiated in the Cretaceous. However, regional isopach maps illustrates that the Jurassic rift system down through the Viking Graben-Central Graben was continued in the Cretaceous. In addition, the marginal basins down the dome flanks indicates that the Jurassic dome continued through the Cretaceous across the entire North Sea Basin between the Sole Pit Basin to the west and the Egersund Basin and the Norwegian-Danish Basin to the east; the sea level was high, and the dome remained below sea level. Post-rift subsidence was not attained until the Tertiary a
Best-selling Author Lawrence Otis Graham to Sign New Book Oct. 24 at Ole Miss Bookstore
No full textOXFORD, Miss. -- New York Times best-selling author Lawrence Otis Graham is scheduled to sign and read from his latest book Tuesday (Oct. 24) at the University of Mississippi. Graham is to be at the Ole Miss Bookstore in the Student Union at 12:30 p.m. to promote The Senator and the Socialite: The True Story of America\u27s First Black Dynasty (HarperCollins, 2006)
Jack Ford: Why I Love Ole Miss
No full textCBS News Legal Analyst and author Jack Ford loves visiting Ole Miss and the Grove, especially on game weekends. Video by Mary Stanton Knighthttps://egrove.olemiss.edu/umvideo/1467/thumbnail.jp
Jüri Okas’ ‘specific objects’: diverging discourses in Estonian Art in the 1970s.
No full textPreviously in the University eprints HAIRST pilot service at http://eprints.st-andrews.ac.uk/archive/00000367/Article 3 of 6 in issue devoted to the visual culture of the Scandinavian and Baltic region.This article will look at the early works of Estonian architect and artist Jüri Okas and will try to work between diverging languages and interpretations, reading works by Okas against the background of Anglo-american conceptualism and minimalism of the same period. The first part of the paper will analyse a print by Jüri Okas that paraphrases works by the American artist Donald Judd and will try to show how Okas’ concept of minimalism differed from the Western one and the reasons behind it. The second part of the paper will focus on a conceptual book by Jüri Okas, consisting of a series of photographs of everyday and banal architectural objects, and compare it to Rober Venturi’s book on Complexity and Contradiction in Architecture. Finally, a comparison will be made with works of Robert Smithson in the context of concepts of waste, excess and the remainders of industrial civilisationPostprin
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