Would you like to test out the isostatic effect of different ice thicknesses or different models for the Earth properties? Try out our new isostasy demo.
A new publication by Fjeldskaar et al. (2017) describes the methods used in our basin modelling software BMT. Full-text version of this paper can be ordered by sending us a request.
A new paper by Fjeldskaar and Amantov is now available in Journal of Geodynamics. The focus is on the exhumation in the Barents and Kara shelves and the resulting isostatic movements.
A new paper by Fjeldskaar and Amantov: Tilted Norwegian post-glacial shorelines require a low viscosity asthenosphere and a weak lithosphere. Published in Regional Geology and Metallogeny.
Full-text version of this paper can be ordered by sending us a request.
Fjeldskaar and Amantov have a new publication on the "effects of glaciations on sedimentary basins" in Journal of Geodynamics. The paper presents some of the major effects that glaciations have on sedimentary basins including examples of quantifications of their significance.
Our new article on the importance of sill thickness and timing of sill emplacement on hydrocarbon maturation was recently published in Marine and Petroleum Geology. The results are a part of Magnhilds Industrial PhD project on "Effects of magmatic intrusions on temperature history and diagenesis in sedimentary basins and the impact on petroleum systems”.
Isostasy is a fundamental concept in geology, and is based on the idea of equilibrium in the upper parts of the Earth.The Earth's crust is floating on the denser mantle similar to an iceberg floating in the sea. Read more about isostasy in our article in geoforskning.no.
The post glacial uplift in Novaya Zemlya is very small, but may however give some insights to the Earth's properties here. Read more about this in our new article in geoforskning.no.
The observed post glacial uplift in Franz Josef Land is not significant, however it may tell us something about the properties of the Earth in this area. More on this in our article in geoforskning.no.
What can the post-glacial uplift of Svalbard tell us about the properties of the Earth in that area? Read more about this in our article in geoforskning.no
The Barents Sea has been subject to significant uplift and erosion the last 60 million years. What may be the causes for this? Read more about this in our new article in geoforskning.no
Scandinavia has been uplifted several hundred meters after the last ice age. How much of this uplift is due to elastic deformation? Read our new article on geoforskning.no (in norwegian).
In part 1, we showed that two quite different models for mantle viscosity match the relaxation spectrum for Scandianavia. One assumes a thick lithosphere, the other assumes a thin lithosphere. Both models can not be correct. Which of the models is more realistic, and why? Read more about this in a new article on geoforskning.no (norwegian).
The properties of the mantle in relation to loading has been a topic of discussions among scientists for nearly 80 years. There is still no agreement on what the viscosity of the mantle is. One of the best ways to determine the viscosity of the mantle and properties of the lithosphere is by studying the post glacial uplift of Scandinavia after the last ice age. Read more about different schools and models, and how they match the observed post glacial uplift in a new article on geoforskning.no.
Greenland is covered by a 3 km thick ice. A new article published in geoforskning.no explains how the ice may have changed the topography of Greenland.
During Precambrian, the Baltica plate was a peneplain. Could the present shape of this plate tell us something about the Earth's elastic properties in Scandinavia?
Read more about this in our article in geoforskning.no.
The Utgard High and the Nyk High represent two of the highs visible on seismic from the Norwegian Sea. Could they have been formed due to compression? Most likely not.
Read more about our theory of the mechanisms behind their origin in geoforskning.no.
The permafrost in the southwestern Barents Sea was probably thin during the last ice age. This is partly due to high heatflow from the Earth's interior and ice streams.
Read more in our new article in geoforskning.no.
Thick sedimentary layers are deposited in the Viking Graben. Why are the upper sediments so different from the older and deeper sediments?
Read more in our new article in geoforskning.no
Sill intrusions may increase the temperature dramatically in a sedimenary basin. This could be great, or bad, news for the petroleum systems.
Read more about this in our new article in geoforskning.no.
In the Viking Graben in the North Sea the sedimentary layers reaches thicknesses up to 13 km. Read more about how this accomodation space could have been created in Geoforskning.no.
It may be crucial to take the fault activity in to account when modelling geohistory and temperature history in a sedimentary basin.
Read more about this in our new article in geoforskning.no.
The presence of salt can be of vital importance for where hydrocarbons are generated and where they accumulate in a sedimentary basin.
Read our new article in geoforskning.no (in norwegian).
Temperature is an important factor in the generation and migration of hydrocarbons. What are the main factors affectsing the temperature in a sedimentary basin?
More about this in our new article in geoforskning.no (in norwegian).
In Jurassic time, the landscape of the Barents Sea was flat. Today the topography of this plain varies more than the mountain areas in Norway - what could be the explaination for this?
Read more about this in our new publication in geoforskning.no
New observations on sea level changes near the poles raise new questions on the claimed melting of ice caps on Antarctica and Greenland the last 40 years.
Read more at geoforskning.no (in Norwegian).
Our studies on glacial isostasy and glacial erosion, and the resulting subsequent tilting of petroleum systems are now available for purchase for the North Sea, Norwegian Sea, and the Barents Sea. The project results are sold in the form of a report and a number of digital maps.
More information on each of the studies can be found under Products.
The enormous masses of ice covering North Europe during the ice ages may have affected faults in the Utsira High area, and thereby lead the migration oil into Johan Sverdrup reservoir.
More about the results from our study with Lundin Norge AS in Geoforskning.no (in Norwegian).
Late movement of the Utsira High related to the ice ages may have given room for migration of oil into the Johan Sverdrup trap.
In Geoforskning.no you can read more about our project with Lundin Norge AS about the effects of glaciations in the Utsira High area.
Isostatic modelling can be helpful in mapping the appearance of former land area of Doggerland during the Last Ice Age.
More about our study in geoforskning.no (in Norwegian).
A new study shows that ice ages may lead to stress changes large enough to reactivate faults. This may have affected the migration routes of hydrocarbons during the last 3.5 million years.
Read more about our results in Geoforskning.no (in Norwegian).
The largest uplift of Norway in relation to the ice ages occurred in the mid Norwegian shelf and in the Norwegian Trough. Here, the uplift could be more than 300 meters.
Read more in our article in Geoforskning.no (in Norwegian).
Current uplift in Scandinavia may give us insight in the ice thickness during the Last Ice Age. In the central parts of the ice cover, the ice thickness were probably around 2000 meters.
More on the calculations in our article in Geoforskning.no (in Norwegian)
New calculations show that the ice advance 11500 years ago can explain the simultaneous sea level rise in West Norway.
Read more about our study in Geoforskning.no (in Norwegian).
A new model shows how much of the rocks that were eroded, and the amount of sediments deposited during the Last Ice Age, the last 100 000 years.
More about our model in Geoforskning.no (in Norwegian).
A new model gives an insight in how the Last Ice Age eroded North Europe and where the sediments were deposited.
More about this in our article in Geoforskning.no (in Norwegian).
The results from a new study shows that the sea level may rise by 40-70 cm the next 200 years.
Read more about the results from our research project in Geoforskning.no (in Norwegian).
The sea level rises by 1.7 mm/year globally. A newly finalized research project shows that this rise is caused by thermal expansion of sea water, which is a result of increased temperature after the Last Ice Age.
Read more about our project results in Geoforskning.no (in Norwegian).
Tectonor participated in the seminar 'Hydrocarbon Habitats – Quaternary Processes in NCS Petroleum Systems' in Oslo 24th of October, 2013. Ronny Setså from geoforskning.no was present at Willy's talk on ice ages and their effects on petroleum systems in the Barents Sea (photo by Ronny Setså).
Read Ronny's article in Geoforskning.no (in Norwegian).
The mid Norway topography has significantly changed since the Last Ice Age. New land arised, and other areas submerged.
Read more about the changes and causing mechanisms in our article in Geoforskning.no (in Norwegian).
Greenland has been uplifted after the Last Ice Age, however, as supposed to Scandinavia most of the uplift occured in the periferal areas of the island.
Read more about ice melting and sea level change in Greenland in our article in Geoforskning.no (in Norwegian).
The ice cover during the ice ages have affected the temperature in the sediments beneath the ice. This may have importance for the generation and migration of hydrocarbons.
Read more about the temperature effect of glaciers in our article in Geoforskning.no (in Norwegian).
There were no sea level rise during the last 2000 years, before the sea level suddenly started rising 150 years ago. Why? and how much?
Read more about our study on possible causes in Geoforskning.no (in Norwegian).
Modelling of how the ice ages changed the landscape can give us a picture on how Norway looked like 3.5 million years ago. For petroleum exploration this is important for the mapping of migration routes. The main part of migration of oil and gas seems to have been taking place during the glaciation period.
More about our study in Geoforskning.no (in Norwegian).
In Scandinavia there has been 30-40 glaciations the last 3.5 million years. What did they look like, and what were the effects of these glaciations?
Read more about the glaciations in our article in Geoforskning.no (in Norwegian)
The sedimentary sequence in the russian part of the Barents Sea is up to 20 km thick. The mechanism behind the formation of the extremely deep basins in the east is not known.
Read more about how a compressional event could cause deepening of the basins in our article in Geoforskning.no (in Norwegian).
Present uplift rates in Lofoten area is higher than expected from glacial isostasy. Part of the uplift can be explained by post-glacial uplift, what mechanisms could explain the remaining uplift?
Read more about the Lofoton anomaly in Geoforskning.no (in Norwegian)
The sea level in Norway have changed in the past, and will change in the future. Various prognoses exist for the future sea level, and many of them predict a sea level rise exceeding 1 meter the next 100 years. A large number of these forecasts are not based on the physical processes causing sea level changes, which makes them less reliable. Which factors causes changes in sea level?
Read more about eustasy and isostasy in Geoforskning.no (in Norwegian).
When an area of the Earth is subject to a load, the periferal areas will become uplifted and create a forebulge. This uplift also occurred in Scandinavia during the Last Ice Age.
Read more about how this forebulge can be calculated in our article in Geoforskning.no (in Norwegian).
Svalbard is uplifting significantly more than can be explained by post-glacial effects. More recent ice melting may be the cause.
Read more about Willy's study on post-glacial uplift on Svalbard in Geoforskning.no (in Norwegian).
The properties of the mantle under loading has been discussed by researchers for nearly 80 years. New calculations show that the asthensophere beneath Scandinavia is very soft, whereas the viscosity for the rest of the mantle is of uniform.
Read more about the study and how it matches observations, in Geoforskning.no (in Norwegian)
The outer shell of the Earth is called lithosphere. By data from the post-glacial uplift, we can conclude that the elastic thickness of the lithosphere underneath Scandinavia is approximately 40 km.
Read more about the study and how it fits with observations in Geoforskning.no (in Norwegian)
A new research project investigates how 3.5 million years of ice ages may have affected the migration routes of oil and gas on the Norwegian shelf.
Our project on effects of glaciations, glacial isostasy and resulting tilting of potential petroleum reservoirs is presented in Geoforskning.no (in Norwegian).
It is said that the Greenland ice cover is melting faster than ever, but gravitational effects will prevent Norway from experience changes in sea level.
Read more about the study on gravitational effects resulting from melting of the Greenland ice in Geoforskning.no (in Norwegian).
The objective of a new research project is to understand the extent and effect of glaciations on petroleum systems in the Barents Sea and Norwegian Sea.
Our project 'Neogene Uplift of the Barents Sea' is presented in Geoforskning.no (in Norwegian).
Magmatic sills may have contributed to increased hydrocarbon maturation and functioned as reservoirs for petroleum offshore mid Norway. A new research project with the objective to investigate these effects has recently started.
Our 'VøMag' project is presented in Geoforskning.no. (in Norwegian)