Spatial and Temporal Variations in Crustal Structure in the Eurasian Basin

Zhao, Lihong; Zhang, Tao; Ling, Zilong; Li, Mujie; Zhi, Pengyao; Ding, Renwei; Li, Chaoyang

doi:10.3390/jmse10020157

Cited by 3 publications

(1 citation statement)

References 51 publications

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“…The residual bathymetry (RB) reflects the initial topography during mid-ocean ridge formation [30,32]. The RB is calculated by removing of the predicted effects of plate cooling [27] and sediment loading from the observed bathymetry [25].…”

Section: Residual Bathymetrymentioning

confidence: 99%

Influence of Melt Supply on the Spreading State of a Slow–Ultraslow-Spreading Ridge: The Reykjanes Ridge, North Atlantic

Zhao,

Liu,

Ling

et al. 2024

JMSE

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Although recent research suggests that the morphology and crustal structure of slow–ultraslow-spreading ridges are mainly controlled by melt supply, there is a lack of quantitative understanding of the effect of systematic changes in melt supply on the seafloor spreading state of mid-ocean ridges. In this study, we used bathymetry, free-air gravity anomaly, and sediment thickness data to calculate the residual bathymetry, mantle Bouguer gravity and crustal thickness of the Reykjanes Ridge. According to the gradient of changes in crustal thickness and residual bathymetry along the axis, the influence of melt supply on the spreading state of the Reykjanes Ridge can be divided into three zones: ultra-strong effect zone (0–160 km), strong effect zone (160–610 km), and weak effect zone (610–930 km). In the ultra-strong effect zone, excess melt supply and a higher melting degree result in a strong upwelling and large melt eruption. The change in relative position between the Reykjanes Ridge and the Iceland hotspot results in the spreading state of the Reykjanes Ridge transforming from asymmetric spreading to symmetric spreading. In the strong effect zone, the decrease in melt supply and melting degree weakens the mantle upwelling and enhances the viscosity of the dehydrated mantle layer. Sufficient viscosity of the dehydrated mantle layer forces asymmetric asthenosphere rise along the sloping boundary of the lithosphere, resulting in symmetric spreading. In the weak effect zone, the pattern of magma upwelling becomes a focused magma supply pattern similar to that of the slow–ultraslow-spreading of the mid-ocean ridge, and tectonics dominate the spreading process. The asymmetry of this weak effect zone may be due to the concentration of tectonic and magmatic activity on one flank of the ridge.

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Section: Residual Bathymetrymentioning

confidence: 99%

Influence of Melt Supply on the Spreading State of a Slow–Ultraslow-Spreading Ridge: The Reykjanes Ridge, North Atlantic

Zhao,

Liu,

Ling

et al. 2024

JMSE

Self Cite

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The Effective Elastic Thickness of the Lithosphere Reveals Tectonic Process and Lithospheric Rheology of the Eurasian Basin

Ling,

Liu,

Zhao

et al. 2024

Terra Nova

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We obtained the effective elastic thickness of the lithosphere (Te) in the Eurasian Basin using the fan‐shaped wavelet method. For ultraslow spreading ridges, the magmatic heat input is insufficient to form continuous quasisteady‐state magma lenses along the axis, resulting in significant variability in the rheological strength of the lithosphere. We suggested that the tectonic inheritance resulted in the different lithospheric rheology of WVZ and SMZ, consequently leading to distinct tectonic‐magmatic activities. The SMZ with less magmatic activity has a weaker lithosphere than that of the EVZ with extensive magmatism. We propose that the lithospheric rheology and thermal structure of ultraslow spreading ridge may be influenced not by the amount of magma supply but by the mode of magma emplacement.

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Digital models of the deep structure of the Earth’s crust in the Eurasian Basin of the Arctic Ocean

Chernykh,

Yakovenko,

Korneva

et al. 2024

Geotektonika

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Based on the method of gravity modeling, taking into account the accumulated geophysical data on the Eurasian Basin of the Arctic Ocean, the authors have developed digital models of the deep structure of the Earth’s crust. The digital models of the basement relief and sedimentary cover thickness in the Eurasia Basin are calculated on the basis of reinterpretation of depth multi-channel seismic cross-sections and 2D gravity modeling. The digital models of the Mohorovichich surface relief and the earth’s crust thickness were calculated using the improved 3D gravity modeling method. It is shown that the reason for the deepening of the basement in the Nansen Basin by 1‒1.5 km in comparison with the Amundsen Basin is a larger volume of accumulated sedimentary cover in the Nansen Basin, with a similar thickness of the crust ~4.8 km in both basins. The characteristics of the oceanic crust studied on the basis of the obtained digital models reveal a complex, three-dimensional variability characteristic of ultra-slow spreading ridges. In the region of the Gakkel Ridge, which was formed at full spreading rates of less than 12 mm/year, the maximum spread of crust thickness is observed, as well as the predominance of the role of the tectonic factor over the magmatic one during the accretion of oceanic crust. Latter fact is expressed in the formation of extended subsea ridges parallel to the amagmatic segments of the ridge.

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Spatial and Temporal Variations in Crustal Structure in the Eurasian Basin

Cited by 3 publications

References 51 publications

Influence of Melt Supply on the Spreading State of a Slow–Ultraslow-Spreading Ridge: The Reykjanes Ridge, North Atlantic

Influence of Melt Supply on the Spreading State of a Slow–Ultraslow-Spreading Ridge: The Reykjanes Ridge, North Atlantic

The Effective Elastic Thickness of the Lithosphere Reveals Tectonic Process and Lithospheric Rheology of the Eurasian Basin

Digital models of the deep structure of the Earth’s crust in the Eurasian Basin of the Arctic Ocean

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