Stochastic behavior of geomagnetic field in the Middle Jurassic-Paleogene

Kurazhkovskii, A. Yu.; Kurazhkovskaya, N. A.; Klain, B. I.

doi:10.1134/s0016793215010089

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…Following and developing this hypothesis, Wendler (2004) suggested that significant turbulent magnetic influences of the spiral arms resulted in reversing geomagnetic fields, while the geomagnetic regime with sparse reversals (superchrons) occurred while the Solar System was positioned in the space between the spiral arms. However, this seems to conflict with a more recent study showing that enhanced turbulence in Earth's liquid core produced the geomagnetic regime with sparse reversals, one of which took place during the warm Cretaceous time (Kurazhkovskii et al, 2015). Barenbaum (2012Barenbaum ( , 2013 and references therein) found even more associations of geological events with "the impact of the Galaxy at the moments when the Solar System gets into the jet flows and spiral galactic arms" (Barenbaum, 2012; page 1).…”

contrasting

confidence: 56%

“…The Cretaceous evolutionary turn was reflected by a specific geomagnetic field (Granot et al, 2012;Molostovskii et al, 2007;Wendler, 2004), including a long period when reversals were sparse or too frequent for detection (Jalal Hyperchron,N88,. This period was also characterized by maxima of chaotic magnetic disturbances, suggesting enhanced turbulence in Earth's liquid core (Kurazhkovskii et al, 2015). Earth's dynamo-machine may not have fully functioned at this time (Molostovskii et al, 2007).…”

Section: Phanerozoic and Late Proterozoicmentioning

confidence: 97%

“…The voluminous extreme release of magma and fluids from Earth's interior reached their apotheosis at 125-100 Ma. They were most likely caused by some deformation in the Earth's outer core that enhanced its turbulence (Kurazhkovskii et al, 2015), and partial closure of the deep channels under elevating influence of the Earth's gravitation. Our planet released 'escaped vapor' at the beginning of its seasonal contraction.…”

Section: Phanerozoic and Late Proterozoicmentioning

confidence: 99%

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The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia

Nechaev

Dai

Sutherland

et al. 2018

Acta Geologica Sinica (Eng)

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this work focuses on one of the critical points of Earth's history when the Solar System passed through the most distant point of its galactic orbit. During this event, Earth may have suffered from maximum extension, associated with its relative proximity to the Sun at that time, followed by long‐term contraction related to its later distancing. This paper is based on generalized data on the Cretaceous evolution of the Earth as a whole and of East Asia in particular. The evidence suggests that major geological processes at this time may be interpreted as transitional changes in the state of Earth. A liquid nature of its core may have reacted to the gravitational and electromagnetic transformations. When the cosmic changes took place at 135–120 Ma, more turbulent flows in the outer core would have favoured the rise of voluminous magmatic plumes and associated fluid flows. These would substantially transform the mantle, crust, hydrosphere, biosphere and atmosphere. In particular, plume‐related melting of overlying subducting slabs and lower continental crust could have initiated numerous adakitic melts that formed the East Asian Adakitic Province. These and associated juvenile events produced numerous metallic ore, coal, gas and oil deposits. The Cretaceous is one of the most significant resource‐producing periods.

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contrasting

confidence: 56%

Section: Phanerozoic and Late Proterozoicmentioning

confidence: 97%

Section: Phanerozoic and Late Proterozoicmentioning

confidence: 99%

See 1 more Smart Citation

The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia

Nechaev

Dai

Sutherland

et al. 2018

Acta Geologica Sinica (Eng)

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Experimental and numerical investigation of bistability in rotating permanent magnet-generated electrolyte flow in a ring-shaped container

Berenis

Grants

2022

Physics of Fluids

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Here, the stability of a transversely magnetized rotating permanent magnet-generated flow in a concentric cylindrical ring channel is studied. Numerical calculations show that the steady-state solution becomes asymmetric through a pitchfork bifurcation at a Reynolds number (Re) of 60. The two new antisymmetric steady-state solutions become cyclic at Re = 90. Nonlinearities develop at larger Re values and the limit cycle solutions are destabilized at Re = 250, enabling random transition events between the two pitchfork branches. Such transitions have been observed in all kinds of natural phenomena, spanning from neuroscientific to astrophysical systems, which are often too complex to be directly computed. Our presented system is physical yet simple enough to be used to conduct a parametric study with full three-dimensional direct numerical simulations. It raises the possibility of numerically and experimentally analyzing transitions in more detail. Experimental measurements indicated the existence of long-lived states and suitability for the proposed system for future studies of such phenomenon. However, the experimental results did not conclusively observe bistability.

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