Break-up and seafloor spreading domains in the NE Atlantic

Gaina, Carmen; Nasuti, Aziz; Kimbell, G. S.; Blischke, Anett

doi:10.1144/sp447.12

Cited by 68 publications

(101 citation statements)

References 84 publications

(98 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our gridded oceanic crustal ages (Figure ) are based on an improved database of magnetic anomaly identifications that were modeled as described by Müller, Sdrolias, Gaina, and Roest () using the geomagnetic polarity timescale of Ogg (). The presented oceanic lithospheric age model builds on the Seton et al () global model and includes recent regional plate tectonic models of the African plate, Indian Ocean, NE Atlantic, and the Arctic (Gaina et al, , , , respectively, Nikishin et al, ) and a revised, more detailed global model for Eocene age oceanic lithosphere (Gaina & Jakob, ). The computation of age of oceanic lithosphere considers the formation of “normal” oceanic lithosphere through seafloor spreading.…”

Section: Age Morphology and Sediment Distribution On Oceanic Lithosmentioning

confidence: 99%

GlobSed: Updated Total Sediment Thickness in the World's Oceans

Straume

Gaina

Medvedev

et al. 2019

Geochem Geophys Geosyst

253

202

View full text Add to dashboard Cite

We present GlobSed, a new global 5‐arc‐minute total sediment thickness grid for the world's oceans and marginal seas. GlobSed covers a larger area than previously published global grids and incorporates updates for the NE Atlantic, Arctic, Southern Ocean, and Mediterranean regions, which results in a 29.7% increase in estimated total oceanic sediment volume. We use this new global grid and a revised global oceanic lithospheric age grid to assess the relationship between the total sediment thickness and age of the underlying oceanic lithosphere and its latitude. An analytical approximation model is used to mathematically describe sedimentation trends in major oceanic basins and to allow paleobathymetric reconstructions at any given geological time. This study provides a much‐needed update of the sediment thickness distribution of the world oceans and delivers a model for sedimentation rates on oceanic crust through time that agrees well with selected drill data used for comparison.

show abstract

Section: Age Morphology and Sediment Distribution On Oceanic Lithosmentioning

confidence: 99%

GlobSed: Updated Total Sediment Thickness in the World's Oceans

Straume

Gaina

Medvedev

et al. 2019

Geochem Geophys Geosyst

253

202

View full text Add to dashboard Cite

show abstract

“…The opening of the Northeast Atlantic, which saw Greenland separate from Northwest Europe, commenced c . 56 Ma (around the Palaeocene/Eocene boundary) with spreading continuing to the present (Gaina, Nasuti, Kimbell, & Blischke, ). However, its proximity to Baffin Island (in some places ≤50 km), and then to the rest of northern Canada, means that it is not especially isolated.…”

Section: The Different Sorts Of “Continental” Islandsmentioning

confidence: 99%

Islands as biological substrates: Continental

Ali

2018

Journal of Biogeography

View full text Add to dashboard Cite

Aim Describe the main geo‐physical features of the various sorts of marine islands that are associated with the continents and consider how the ontogenetic pathways of each landmass type might have shaped the hosted biotas. Location Global. Methods Review of the literature that underpins understanding of the “continental” marine islands, particularly those publications with biological, geological, geophysical, oceanographical and palaeoceanographical foci. Results Based on their geo‐physical settings, islands with continental basements/close connections to the continents can be assigned to one of nine categories: shelf, shelf volcano, orogenic margin, continental arc, continental fore‐arc, rifted arc‐raft, isolated raft atoll, isolated block and micro‐continental terrane. As each functions in a distinctive manner, this must have strongly imprinted the native biotas. Main conclusions “Continental” marine islands can be allocated to one of nine groups based on their respective geo‐physical locations. When geological time is considered, then the unique histories of each insular landmass type will have played a critical role in moulding the land‐locked faunal assemblages that have amassed and evolved atop them. Researchers investigating insular biotas, particularly those exploring biodiversity growth, may wish to accommodate these insights.

show abstract

“…Opening of the Labrador Sea and rifting between Greenland and Europe competed for many tens of million years (Dickie et al, 2011;Hosseinpour et al, 2013;Barnett-Moore et al, 2016) before the present-day North East Atlantic mid-ocean ridge 10 formed in Eocene times (Gernigon et al, 2015;Gaina et al, 2017) possibly due to the arrival of the Iceland hotspot (Coffin and Eldholm, 1992;Storey et al, 2007). Final separation between Greenland and Europe took place along the sheared margin of the Fram Strait in Miocene times ~17-15 Ma (Jakobsson et al, 2007;Knies and Gaina, 2008).…”

Section: North Atlantic Riftmentioning

confidence: 99%

Oblique rifting: the rule, not the exception

Brune¹,

Williams²,

Müller³

2018

Preprint

View full text Add to dashboard Cite

Abstract. Movements of tectonic plates often induce oblique deformation at divergent plate boundaries. This is in striking contrast with traditional conceptual models of rifting and rifted margin formation, which often assume 2D deformation 10 where the rift velocity is oriented perpendicular to the plate boundary. Here we quantify the validity of this assumption by analysing the kinematics of major continent-scale rift systems in a global plate tectonic reconstruction from the onset of Pangea breakup until present-day. We evaluate rift obliquity by joint examination of relative extension velocity and local rift trend using the script-based plate reconstruction software pyGPlates. Our results show that the global mean rift obliquity amounts to 34° with a standard deviation of 24°, using the convention that the angle of obliquity is spanned by extension 15 direction and rift trend normal. We find that more than ~70% of all rift segments exceeded an obliquity of 20° demonstrating that oblique rifting should be considered the rule, not the exception. In many cases, rift obliquity and extension velocity increase during rift evolution (e.g. Australia-Antarctica, Gulf of California, South Atlantic, India-Antarctica), which suggests an underlying geodynamic correlation via obliquity-dependent rift strength. Oblique rifting produces 3D stress and strain fields that cannot be accounted for in simplified 2D plane strain analysis. We therefore highlight the importance of 3D 20 approaches in modelling, surveying, and interpretation of most rift segments on Earth where oblique rifting is the dominant mode of deformation.

show abstract

Break-up and seafloor spreading domains in the NE Atlantic

Cited by 68 publications

References 84 publications

GlobSed: Updated Total Sediment Thickness in the World's Oceans

GlobSed: Updated Total Sediment Thickness in the World's Oceans

Islands as biological substrates: Continental

Oblique rifting: the rule, not the exception

Contact Info

Product

Resources

About