Aleutian basin oceanic crust

Christeson, G. L.; Barth, G. A.

doi:10.1016/j.epsl.2015.06.040

Cited by 12 publications

(6 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This structure, named the "Vitus arch," was instead interpreted by Chekhovich et al (2012) as a large push-up structure formed along a large strike-slip fault during the Middle Eocene. However, a recent seismic study of the crustal structure of the Aleutian Basin across the Vitus Arch by Christeson and Barth (2015) found no evidence for Cenozoic spreading or push-up structures and we do not reconstruct significant Cenozoic deformation in this region.…”

Section: Plate Circuit and Marine Magnetic Anomaly-based Isochronscontrasting

confidence: 82%

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

2019

View full text Add to dashboard Cite

The Eocene (~50–45 Ma) major absolute plate motion change of the Pacific plate forming the Hawaii‐Emperor bend is thought to result from inception of Pacific plate subduction along one of its modern western trenches. Subduction is suggested to have started either spontaneously, or result from subduction of the Izanagi‐Pacific mid‐ocean ridge, or from subduction polarity reversal after collision of the Olyutorsky arc that was built on the Pacific plate with NE Asia. Here we provide a detailed plate‐kinematic reconstruction of back‐arc basins and accreted terranes in the northwest Pacific region, from Japan to the Bering Sea, since the Late Cretaceous. We present a new tectonic reconstruction of the intraoceanic Olyutorsky and Kronotsky arcs, which formed above two adjacent, oppositely dipping subduction zones at ~85 Ma within the north Pacific region, during another Pacific‐wide plate reorganization. We use our reconstruction to explain the formation of the submarine Shirshov and Bowers Ridges and show that if marine magnetic anomalies reported from the Aleutian Basin represent magnetic polarity reversals, its crust most likely formed in an ~85‐ to 60‐Ma back‐arc basin behind the Olyutorsky arc. The Olyutorsky arc was then separated from the Pacific plate by a spreading ridge, so that the ~55‐ to 50‐Ma subduction polarity reversal that followed upon Olyutorsky‐NE Asia collision initiated subduction of a plate that was not the Pacific. Hence, this polarity reversal may not be a straightforward driver of the Eocene Pacific plate motion change, whose causes remain enigmatic.

show abstract

Section: Plate Circuit and Marine Magnetic Anomaly-based Isochronscontrasting

confidence: 82%

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

2019

View full text Add to dashboard Cite

show abstract

“…We model the crust that underlies the Aleutian Basin as a trapped piece of 83‐ to 68‐million‐year‐old Pacific Ocean crust (Scholl et al, ) with entrapment occurring at 46 Ma. A recent crustal velocity structure analysis of the Aleutian Basin failed to find differences in crustal structure to support an alternative back‐arc basin model (Christeson & Barth, ). The opening of the Makarov Basin between the Alpha and Lomonosov Ridges from 57 to 69 Ma is modeled after Alvey et al () and Døssing et al () (Figure ).…”

Section: Deforming Regions Within the Global Plate Modelmentioning

confidence: 99%

A Global Plate Model Including Lithospheric Deformation Along Major Rifts and Orogens Since the Triassic

et al. 2019

View full text Add to dashboard Cite

Global deep‐time plate motion models have traditionally followed a classical rigid plate approach, even though plate deformation is known to be significant. Here we present a global Mesozoic–Cenozoic deforming plate motion model that captures the progressive extension of all continental margins since the initiation of rifting within Pangea at ~240 Ma. The model also includes major failed continental rifts and compressional deformation along collision zones. The outlines and timing of regional deformation episodes are reconstructed from a wealth of published regional tectonic models and associated geological and geophysical data. We reconstruct absolute plate motions in a mantle reference frame with a joint global inversion using hot spot tracks for the last 80 million years and minimizing global trench migration velocities and net lithospheric rotation. In our optimized model, net rotation is consistently below 0.2°/Myr, and trench migration scatter is substantially reduced. Distributed plate deformation reaches a Mesozoic peak of 30 × 106 km2 in the Late Jurassic (~160–155 Ma), driven by a vast network of rift systems. After a mid‐Cretaceous drop in deformation, it reaches a high of 48 x 106 km2 in the Late Eocene (~35 Ma), driven by the progressive growth of plate collisions and the formation of new rift systems. About a third of the continental crustal area has been deformed since 240 Ma, partitioned roughly into 65% extension and 35% compression. This community plate model provides a framework for building detailed regional deforming plate networks and form a constraint for models of basin evolution and the plate‐mantle system.

show abstract

“…Significant regional variations in the total crustal thickness (6.2 to 9.6 km at the Vitus Arch) are not related to changes in orientation of magnetic lineaments (Fig. 3) (Christeson and Barth, 2015). 2 for details.…”

Section: Babs Of the North-western Pacific Ocean #1 Aleutian Basinmentioning

confidence: 97%

“…Recent seismic refraction profiles with the length of ~450 km across the central part of the basin (the Vitus Arch) image thick sediments (2 to 5 km, on average ca 4 km thick) overlying a 7-9 km thick oceanic crust (Fig. 11) (Christeson and Barth, 2015). Basement velocities increase from ca.…”

Section: Babs Of the North-western Pacific Ocean #1 Aleutian Basinmentioning

confidence: 99%

Back-arc basins: A global view from geophysical synthesis and analysis

Artemieva

2023

Preprint

View full text Add to dashboard Cite

<p>This global study of 31 off-shore back-arc basins (BABs) identifies their principal characteristics based on a broad spectrum of geophysical and subduction-related parameters. My synthesis is used to identify trends in the evolution of BABs for improving our understanding of subduction systems in general. The analysis, based on the present plate configuration, demonstrates that geophysical characteristics and fate of the BABs are essentially controlled by the tectonic type of the overriding plate, which controls the lithosphere thermo-compositional structure and rheology. The type of the plate governs the length of the extensional zone in back-arc settings along the trench, the efficiency of lithosphere stretching, and the crustal structure, buoyancy and bathymetry of the BABs. Subduction dip angle apparently controls the location of the slab melting zone and the efficiency of slab roll-back with feedback links to other parameters. By the tectonic nature of the overriding plate (the downgoing plate is always oceanic) the back-arc basins are split into active BABs formed by ocean-ocean, arc-ocean, and continent-ocean convergence, and extinct back-arc basins. By geophysical characteristics, BABs formed on continental plates are subdivided into active BABs with and without seafloor spreading, and extinct BABs are subdivided into the Pacific BABs, possibly formed on oceanic plates, and the non-Pacific BABs with reworked continental or arc fragments. Six types of BABs are distinctly different. Extension of the overriding oceanic plate above a steeply dipping old oceanic plate, preferentially subducting nearly westwards, forms large deep back-arc basins with a thin oceanic- type crust. In contrast, BABs on the overriding continental or arc plates form at small opening rates and often by shallow subduction of younger oceanic plates with a random subduction orientation; these BABs have small sizes, shallow bathymetry, and hyperextended or transitional ~20 km thick arc- or continental-type crust typical of passive margins. The presence of a 2&#8211;5 km thick high-Vp lowermost crustal layer, characteristic of BABs in all settings, indicates the importance of magmatic underplating in the crustal growth. Conditions required for the initiation of a back-arc basin and transition from stretching to seafloor opening depend on the nature of the overriding plate. BABs formed on oceanic plates always evolve to seafloor spreading. BABs formed on continental or arc plates require long spreading duration with large (>8 cm/y) opening rates and a large crustal thinning factor of 2.8&#8211;5.0 to progress from crustal extension to seafloor spreading. On the present Earth such transition does not happen in the BABs formed behind a shallow subduction (<45o) of a young (<40 My) oceanic plate. The nature of the overriding plate also determines the fate of back-arc basins after termination of lithosphere extension: the extinct Pacific BABs with oceanic-type crust evolve towards deep old &#8220;normal&#8221; oceans, while the shallow non-Pacific BABs with low heat flow and thick crust are likely to preserve their continental or arc affinity. BABs do not follow the oceanic cooling plate model predictions. Distinctly different geophysical signatures for mid-ocean ridge spreading and for back-arc seafloor spreading are caused by principally different dynamics. https://doi.org/10.1016/j.earscirev.2022.104242</p>

show abstract

Aleutian basin oceanic crust

Cited by 12 publications

References 34 publications

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

A Global Plate Model Including Lithospheric Deformation Along Major Rifts and Orogens Since the Triassic

Back-arc basins: A global view from geophysical synthesis and analysis

Contact Info

Product

Resources

About