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Now showing items 1-35 of 35
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The formation of the NE Atlantic conjugate margins is the result of multiple rifting phases spanning from the Late Paleozoic and culminating in the early Eocene when breakup was accompanied with intense magmatic activity. ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The Ediacaran Period was an interval of significant global transformation, marked by major changes in the biosphere, cryosphere, hydrosphere and atmosphere, and possibly the solid Earth. A better understanding of this ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The Ordovician global cooling trend observed by several temperature proxies, which coincides with one of the most significant evolutionary diversifications on Earth, is yet to be fully understood. This study presents new ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The validity of sea level estimates based on stratigraphic correlations has been debated since the 1990 s as relative sea level curves differ between sites due to local tectonics, different deposition rates and changes in ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Here we present new 40Ar/39Ar geochronology, rock magnetic, and paleomagnetic data obtained from rocks from three distinct domains of the Precambrian Sveconorwegian orogen (Southern Norway) that record progressively younger ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Long-term carbon cycle models are critical for understanding the levels and underlying controls of atmospheric CO2 over geological time-scales. We have refined the implementation of two important boundary conditions in ...
Jurassic fast polar shift rejected by a new high-quality paleomagnetic pole from southwest Greenland
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
A selective compilation of paleomagnetic data from North America indicates that a vast amount of rapid polar motion occurred in Late Jurassic time. The over 30° polar shift that accumulated during a relatively short time ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Although central to an understanding of Earth's paleogeography and the myriad processes that it affects, the geometry of Pangea during the early phase of its lifetime has remained a topic of contention since the plate ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
New palaeogeographical reconstructions for the earlier Ordovician (480 Ma), and later Ordovician (450 Ma) integrate revised longitude-calibrated palaeomagnetic reconstructions and the inclusion of synthetic plate margins ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
Abstract The origin of Large Igneous Provinces (LIPs) associated with continental breakup and the reconstruction of continents older than c. 320 million years (pre-Pangea) are contentious research problems. Here we study ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
We provide an independent test for the proposed pre-breakup fits between the South American and African continental margins based on new palaeomagnetic data. In the course of modelling the opening of the South Atlantic ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
The northeast Atlantic encompasses archetypal examples of volcanic rifted margins. Twenty-five years after the last ODP (Ocean Drilling Program) leg on these volcanic margins, the reasons for excess melting are still ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
We have devised a new absolute Late Jurassic‐Cretaceous Pacific plate model using a fixed hot spot approach coupled with paleomagnetic data from Pacific large igneous provinces (LIPs) while simultaneously minimizing plate ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
Decades of geochronological work have shown the temporal distribution of zircon ages to be episodic on billion-year timescales and seemingly coincident with the lifecycle of supercontinents, but the physical processes ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
In the classical concept, a hotspot track is a line of volcanics formed as a plate moves over a stationary mantle plume. Defying this concept, intraplate volcanism in Greenland and the North Atlantic region occurred ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
A fragment of continental crust has been postulated to underlie the young plume-related lavas of the Indian Ocean island of Mauritius based on the recovery of Proterozoic zircons from basaltic beach sands. Here we document ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Gondwana was an enormous supertarrane. At its peak, it represented a landmass of about 100 × 106 km2 in size, corresponding to approximately 64% of all land areas today. Gondwana assembled in the Middle Cambrian, merged ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
The notorious ~60° bend separating the Hawaiian and Emperor chains marked a prominent change in the motion of the Pacific plate at ~47 Ma (million years ago), but the origin of that change remains an outstanding controversy ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
A conspicuous 60° bend of the Hawaiian-Emperor Chain in the north-western Pacific Ocean has variously been interpreted as the result of an abrupt Pacific plate motion change in the Eocene (∼47 Ma), a rapid southward drift ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Earth’s spin axis follows the maximum moment of inertia axis of mantle convection, with some delay due to adjustment of the rotational bulge. Here we compute this axis for geodynamic models based on subduction history, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
Absolute reconstructions of large igneous provinces (LIPs) for the past 300 Ma reveal a remarkable spatial pattern suggesting that almost all LIPs have erupted over the margins of the two large‐scale structures in the ...
(Journal article / Tidsskriftartikkel / SubmittedVersion, 2016)
Kevin Burke’s original and thought-provoking contributions have been published steadily for the past 60 years, and more than a decade ago he set out to resolve how plate tectonics and mantle plumes interact by proposing a ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
Hotspot tracks are thought to originate when mantle plumes impinge moving plates. However, many observed cases close to mid‐ocean ridges do not form a single age‐progressive line, but vary in width, are separated into ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2013)
Viscous convection within the mantle is linked to tectonic plate motions and deforms Earth’s surface across wide areas. Such close links between surface geology and deep mantle dynamics presumably operated throughout Earth’s ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2013)
The Laccadive–Chagos Ridge and Southern Mascarene Plateau in the north-central and western Indian Ocean, respectively, are thought to be volcanic chains formed above the Réunion mantle plume1 over the past 65.5 million ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2012)
A significant number of new palaeomagnetic poles have become available since the last time a compilation was made (assembled in 2005, published in 2008) to indicate to us that a new and significantly expanded set of tables ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
We defined a new global moving hot spot reference frame (GMHRF), using a comprehensive set of radiometric dates from arguably the best‐studied hot spot tracks, refined plate circuit reconstructions, a new plate polygon ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
It is generally believed that subduction of lithospheric slabs is a major contribution to thermal heterogeneity in Earth's entire mantle and provides a main driving force for mantle flow. Mantle structure can, on the one ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2012)
The Earth's internal magnetic field varies on timescales of months to billions of years. The field is generated by convection in the liquid outer core, which in turn is influenced by the heat flowing from the core into the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
We present geodynamic models featuring mantle plumes that are almost exclusively created at the margins of large thermo‐chemical piles in the lowermost mantle. The models are based on subduction locations and fluxes inferred ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2012)
The equipotential figures of Earth (residual geoid), and of Mars (areoid) are characterized by pairs of elevated and pairs of depressed antipodal equatorial regions. Elevated regions of the residual geoid lie vertically ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2010)
Diamonds are formed under high pressure more than 150 kilometres deep in the Earth’s mantle and are brought to the surface mainly by volcanic rocks called kimberlites. Several thousand kimberlites have been mapped on various ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)
Earth's orientation relative to its spin axis is determined by its nonhydrostatic inertia tensor. We show here that the present‐day nonhydrostatic inertia tensor can be modeled by combining contributions due to large low ...
(Journal article / Tidsskriftartikkel / SubmittedVersion, 2010)
We have developed an improved model of global digital palaeo-plate boundaries and plate motion to describe the distribution and history of plates since the Late Jurassic. From this history we computed net lithospheric ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2010)
The relation between gravity anomalies, topography and volcanism can yield important insights about the internal dynamics of planets. From the power spectra of gravity and topography on Earth, Venus and Mars we infer that ...