The geodynamic history of a region is archived in its geologic record which, in turn, may reflect deformation patterns that causally can be related to certain configurations of paleostresses. In the Oslo Region, the exposed geological record ranges from Precambrian high-grade metamorphic rocks
Relative dating activity uio as Cambro-Silurian sedimentary rocks to Permo-Carboniferous sedimentary and magmatic rocks, the latter being related to the development of the Oslo rift system.
We investigate the kinematics of outcrop-scale faults to derive the diversity of paleostress states responsible for the observed strain.
The present study gives evidence for three major regional paleostress fields that affected the Oslo Region: For a large number of estimated stress states, none of the principal axes are sub-vertical. The present study tends to show that the Oslo Region remained unaffected by major tectonic activity for much of the Mesozoic and Cenozoic — which is when the Central European Basin System to the south experienced several phases of intense deformation. The Oslo Rift is the northernmost part of the Rotliegendes basin system in Europe.
The rift was formed by lithospheric stretching north of the Tornquist fault system and is related tectonically and in time to the last phase of the Variscan orogeny.
The main graben forming period in the Oslo Region began in Late Carboniferous, culminating some 20—30 Ma later with extensive volcanism and rifting, and later with uplift and emplacement of major batholiths.
It ended with a final termination of intrusions in the Early Triassic, some 65 Ma after the tectonic and magmatic onset. We divide the geological development of the rift into six stages. Sediments, even with marine incursions occur exclusively during the forerunner to rifting.
The magmatic products in the Oslo Rift vary in composition and are unevenly distributed through the six stages along the length of the structure. The presence or absence of a thermally anomalous mantle plume during the formation of the widespread Carboniferous—Permian magmatism of northern Europe is examined. Both tholeiitic and alkaline magmas have diverse trace element compositions. The tholeiites have a "Relative dating activity uio as" affinity to E-MORB but have mixed with variable amounts of lithosphere and upper crust.
Tectonic reorganisation and decompression melting of a trace element-enriched mantle is considered to have controlled the Carboniferous—Permian magmatism, which contains no coherent geochemical evidence for a single plume-related thermo-chemical anomaly.
Utover i permtiden ble en riftdal dannet med strekking av jordskorpa og store forkastninger. This study focuses on Late Carboniferous - Permian tectonics and related magmatic activity in north-western Europe, and specifically in the Skagerrak, Kattegat and North Sea areas. A large database consisting of seismic and well data has been assembled and analysed to constrain these objectives. The continuation of the Oslo Graben into the Skagerrak has been a starting point for this regional study.
Rift structures with characteristic half-graben geometries and the distribution of magmatic rocks intrusives and extrusives were mapped using integrated analyses of seismic
Relative dating activity uio as potential field data.
The rift structures in the Skagerrak can be linked with extensional structures in the Sorgenfrei-Tornquist Zone in which similar fault geometries have been observed. Both in the Skagerrak and the Kattegat, lava sequences were deposited which generally parallel the underlying Lower Palaeozoic strata.
This volcanic episode therefore, predates main fault movements and the development of half-grabens filled with Permian volcaniclastic material. Especially in the latter area, the dense seismic and well coverage has allowed us to map out similar Upper Palaeozoic geometries, although the presence of salt often conceals the seismic image of the underlying strata and structures. From the results, it is assumed that the pre-Jurassic structures below large parts of the Norwegian-Danish Basin and northwards into the Stord Basin on the Horda Platform belong to the same tectonic system.
One of the main goals of this project was to produce a new map for this time period showing the distribution of Late Carboniferous — Early Permian Lower Rotliegend volcanics, dykes and sills and the extent of the tectonic structures of the Early — Late Permian Upper Rotliegend sedimentary basins better known as the Southern and Northern Permian Basins.
In order to produce this map, an overview of all the available literature was made. The new map was completed based on our own interpretations from seismic and borehole data. Unpublished data were available through industrial partners associated with the PCR-project.
The Permo-Carboniferous evolution of the central North Sea is characterized by three main geological events: The timing of the late Carboniferous - Permian basaltic volcanism in the North Sea is
Relative dating activity uio as constrained, as is the timing of extensional tectonic activity following main inversion during the Westphalian due to the propagation of the Variscan deformation front. The presence of volcanics below the dated horizon, suggests that the onset of Permo-Carboniferous volcanism in the central North Sea commenced earlier, probably at c.
This is contemporaneous with other observations of tholeiitic volcanism in other parts of NW Europe, including the Oslo Graben, the north-east German Basin, southern Sweden and Scotland. Interpretations of available seismic data show that main extensional faulting occurred after the volcanic activity, but the exact age of the fault activity is difficult to constrain with the data available.
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These profiles are located in different tectonic units, which represent different stages in Precambrian crustal and lithospheric growth. First, present-day geotherms were constructed for several points along the DSS profiles. Successively, strength envelopes were calculated using the obtained geotherms and rheological flow laws. Variations in strain rate were also considered in the computations of the strength envelopes. The integrated crustal and lithospheric strengths, the thicknesses of the mechanically strong crust MSC and mechanically strong lithosphere MSLand the rheological thickness of the lithosphere were derived from these strength envelopes.
The obtained mechanical structures for different regions were analysed and compared with other geophysical data; e. The rheological results show lateral variations in the lithospheric strength reflecting the geometry of the lithosphere and following roughly the same trend as the geochronological development of the Fennoscandian Shield.
The mechanical structure shows distinct decoupling of the weak lower crust and the strong upper mantle, particularly with a wet rheology. This decoupling interrupts the transmission of the differential stress from the brittle upper crust to the ductile lower crust and through it to the mantle lithosphere. The weak lower crustal layer is also detected with a dry rheology in the Svecofennian area, whereas in the Archaean side, it is not distinct.
The assumed frictional transition temperature of C varies between the depths of 25
Relative dating activity uio as 44 km with an average value of 35 km. This is in good agreement "Relative dating activity uio as" the observed focal depth limit of 31 km. This activity asks students to...
The three intracratonic sedimentary basins located in central Baltoscandinavia, namely the Bothnian Gulf basin, the Bothnian Sea basin and the Baltic basin, developed in response to Middle Proterozoic and Late Proterozoic tectonic events, separated in time by about Ma.
Only the Baltic basin was subsequently affected by Caledonian orogenesis and Mesozoic rifting. Crustal extension was minor or did not take place during the Proterozoic basin evolution phases.
However, "relative" dating or time...
However, according to the Moho topography, crustal thinning did take place. This was probably a result of subcrustal magmatism. On a craton-wide scale, the ages of granitoids, which intruded during the Middle Proterozoic basin formation, generally decrease from east to west.
This fact, combined with the evidence provided by mantle-derived flood basalt magmatism, points to a moving asthenospheric diapir as the cause for basin development.
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Asthenospheric upwelling was probably also responsible for the second, Late Proterozoic, basin evolution phase, as evidenced by the lack of crustal thinning and extension,
Relative dating activity uio as the occurrence of tholeiitic intrusions. In addition, a Late Proterozoic thermally induced palaeo-high, located at
Relative dating activity uio as the position of the intracratonic basins, is compatible with indications from glaciations.
As the ages of Late Proterozoic intracratonic basins also decrease from east to west across the craton, the location of asthenospheric diapirism during this time interval was also moving. For the Fennoscandian lithosphere, the presence of fundamental lithospheric weakness zones e.
The spacing and size of the Proterozoic intracratonic basins suggest that the asthenospheric diapirism was not deep seated. "Relative dating activity uio as," sublithospheric convective processes might be the cause for the asthenospheric upwellings. Such processes are related to Rayleigh--Taylor instabilities in the sublithospheric mantle.
Emplacement of an asthenospheric diapir causes a thermal bulge at the surface of the lithosphere. Modelling results demonstrate that erosion of the surficial high, succeeded by cooling of the lithosphere, can explain the accumulation of early Palaeozoic sediments in the Bothnian Sea basin, taking into account post-Ordovician vertical and lateral erosion of the basin fill. Interpretation of deep seismic reflection data across the Gascoyne Margin reveals six distinct seismic facies units related to the tectono-magmatic breakup history.
On the outer Exmouth Plateau four large scale units are identified: Two additional units are found near the continent-ocean boundary COB ; 5 seaward-dipping reflectors SDR ; and 6 landward-dipping reflectors in the lower crust below the SDR. There is a spatial correlation between the underplated area and the presence of extensive upper-crustal block-faulting and intrusive rocks in the shallow crust.
The undulatory middle-crustal reflector unit is also only identified in the outer plateau area, and is interpreted as a zone in which the upper-crustal faults terminate. The inner parts of the margin consist of a deep basin showing little upper-crustal faulting and no evidence of middle crustal deformation or underplating.
Theoretical modeling of the effect of rifting and magmatic underplating on crustal strength profiles suggests that the brittle-ductile transition may migrate at least 5 km upwards during several million years after the underplating event.
Based on the seismic interpretation and crustal strength modeling we propose that the seismic structure of the outer Exmouth Plateau is severely modified by a transient change in the crustal rheological structure associated with magmatic underplating.
The post-Svecofennian tectonic development of southern Finland is controlled by intrusion of rapakivi granites and associated rocksreactivation of Svecofennian wrench zones, formation of sedimentary basins and successive intrusion of olivine dolerite dykes and sills. Relative age determinations have revealed that fault
Relative dating activity uio as acted before, simultaneously and after intrusion of the rapakivi granites.
These ages are all significantly younger than the intrusion age of the rapakivi granites. It is suggested that these ages represent tectonic events related to the intrusion of olivine dolerite dykes and sills in SW Finland and the Sveconorwegian Orogeny active further west. These ages are suggested to represent either cooling ages of the granite or ages associated with the formation of the sedimentary grabens.
View all works in Cristin. This paper describes a newly started collaboration between the Departments of Geosciences and Informatics at the University of Oslo where a pilot laboratory will be used to develop and implement scalable data access interfaces to DISKOS and other petro-technical tools. This laboratory provides a way for exploring new ways of teaching and research using National Repository Data and also provides a way to experiment around future data access methods for DISKOS and similar repositories.
The offshore Skagerrak Graben, which is defined as the southwards continuation of the onshore Oslo Graben, has recently been the focus of some debate regarding its tectonomagmatic development. Two hypotheses
Relative dating activity uio as its development exist i. The onshore Oslo Graben to the north is a well known continental rift system with opposing half grabens and excessive magmatism that developed during late-Carboniferous-Permian times.
Seismic and well data from the Sorgenfrei-Tormquist Zone to the south have shown similar rift geometries as found in the "Relative dating activity uio as" Graben as well as in the Skagerrak Graben and also show the presence of magmatic products of late-Carboniferous- early Permian age.
Integrating both geological structural geological, petrological and geophysical potential field data, seismic data data, we will summarize some important observations regarding the geometry, vertical movements and magmatism of the graben in both time and space.
We will put focus on: This suggest increased mantle potential temperature and an upward shift of the solidus - A regional E-W stress field gives rise to oblique components in the Skagerrak Graben sinistral and the Sorgenfrei-Tornquist Zone dextral.
Any effects of structural inheritance? This would suggest a maximum uplift and erosion at the inner corner between the Skagerrak Graben and the Sorgenfrei-Tornquist Zone.
Is there any relationship to underplating and magmatism?
Why did not the Zechstein Sea transgress the Oslo Rift? There is a clear regional unconformity which has been transgressed and buried in Middle? Permo-Carboniferous dykes and sills of various composition are encountered in southern Norway, Scotland
Relative dating activity uio as southern Sweden.
They most likely belong to the large tectono-magmatic episode which was also responsible for the formation of the Oslo Graben and the Northern German Basin. Dykes and sills are regarded as reliable stress indicators and a detailed analyses of the Permo-Carboniferous dykes and sills would provide us with valuable structural constraints about this prominent tectono-magmatic episode in NW Europe. In order to do this a large database on dykes and sills of Permo-Carboniferous age has been put together including data on structure, petrology, geochemistry and geochronology.
Data documented and published over the last hundred years has been supplemented with new data gathered over the last years. We investigate the kinematics of faults on the outcrop scale to estimate the diversity of paleostress states responsible for the observed strain. Links; Free dating sites like fling · Hook up fall in love · Site de rencontre Dating site for military free · Relative dating activity uio as · Bedwetting dating site. However, "relative" dating or time can be an easy concept for students to learn.
In "Relative dating activity uio as" activity, students begin a sequencing activity with familiar items — letters. Request PDF on ResearchGate | The relative age of mountain permafrost- estimation of Thomas Vikhamar Schuler at University of Oslo.
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Symptoms of hydrocephalus vary with age. The most intensive magmatism took place in the Oslo Graben ca. Asthenospheric upwelling was probably also responsible for the second, Late Proterozoic, basin evolution phase, as evidenced by the lack of crustal thinning and extension, and the occurrence of tholeiitic intrusions. In order to discuss the development of the Oslo Graben in terms of plate vs.
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The geodynamic history of a region is archived in its geologic record which, in turn, may reflect deformation patterns that causally can be related to certain configurations of paleostresses.
In the Oslo Region, the exposed geological list ranges from Precambrian high-grade metamorphic rocks through Cambro-Silurian sedimentary rocks to Permo-Carboniferous sedimentary and magmatic rocks, the latter being related to the development of the Oslo break-up system.
We look into the kinematics of outcrop-scale faults to derive the departure of paleostress states responsible for the observed strain. For the duration of this purpose, we combine different graphical and numerical approaches to separate heterogeneous fault-slip data sets and estimate the associated reduced force tensors. The tender study gives sign for three paramount regional paleostress fields that affected the Oslo Region: Fit a large loads of estimated pressure states, none of the principal axes are sub-vertical.
The present study tends to show that the Oslo Division remained unaffected beside major tectonic vocation for much of the Mesozoic and Cenozoic — which is when the Central European Basin System to the south experienced respective phases of high-strung deformation.
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What makes her a keeper? Visiting address Sem Sælands vei 1 Geologibygningen OSLO . Late Carboniferous - Permian tectonics and magmatic activity in the. Request PDF on ResearchGate | The relative age of mountain permafrost- estimation of Thomas Vikhamar Schuler at University of Oslo..
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