Variations in melt supply along an orthogonal supersegment of the Southwest Indian Ridge (16°–25°E)

Zha, Caicai; Lin, Jian; Zhou, Zhiyuan; Zhang, Xubo; Xu, Min; Zhang, Fan

doi:10.1007/s13131-021-1724-3

Acta Oceanol. Sin.

2021

DOI: 10.1007/s13131-021-1724-3

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Variations in melt supply along an orthogonal supersegment of the Southwest Indian Ridge (16°–25°E)

Caicai Zha

Jian Lin

Zhiyuan Zhou

et al.

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The crustal structure of the western Amundsen Basin, Arctic Ocean, derived from seismic refraction/wide-angle reflection data

Castro,

Funck,

Hopper

2023

Geophysical Journal International

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Summary Two geophysical expeditions (LOMROG II and III) were carried out in 2009 and 2012 to acquire seismic data in the western Amundsen Basin in the Arctic Ocean, a basin formed by ultraslow seafloor spreading at the Gakkel Ridge. Previous studies show alternating magmatic and amagmatic segments at the ridge but it is unclear if such segmentation persisted throughout the entire opening history of the basin. The seismic refraction data were used to develop P-wave velocity models down to the uppermost mantle employing forward modeling of travel times. The coincident seismic reflection data were used to constrain the geometry of the sedimentary layers and for characterising the acoustic basement. Two-dimensional gravity modeling was used to determine the Moho depth in areas when data quality was insufficient to resolve a Moho reflection. The models distinguish three different basement types: oceanic crust with layers 2 and 3, oceanic crust that is lacking a layer 3, and exhumed and serpentinised mantle. The maximum observed crustal thickness is 6 km. Areas with thin crust (< 3 km) may be underlain by partially serpentinised mantle. Where exhumed mantle is observed, a serpentinisation front separates highly serpentinised mantle at the top from partially serpentinised mantle below. The presence of oceanic crust off-axis of the presently amagmatic sector of the Gakkel Ridge indicates that there is both a spatial and temporal variation of crustal accretion processes at the ridge.

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The crustal structure of the western Amundsen Basin, Arctic Ocean, derived from seismic refraction/wide-angle reflection data

Castro,

Funck,

Hopper

2023

Geophysical Journal International

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show abstract

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Variations in melt supply along an orthogonal supersegment of the Southwest Indian Ridge (16°–25°E)

Cited by 1 publication

References 43 publications

The crustal structure of the western Amundsen Basin, Arctic Ocean, derived from seismic refraction/wide-angle reflection data

The crustal structure of the western Amundsen Basin, Arctic Ocean, derived from seismic refraction/wide-angle reflection data

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