Despinning of the earth rotation in the geological past and geomagnetic paleointensities

Denis, C.; Schreider, A. A.; Varga, P.; Závoti, József

doi:10.1016/s0264-3707(02)00049-2

Cited by 38 publications

(27 citation statements)

References 21 publications

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“…Stoyko (1970), Scrutton (1978) and Lambeck (1980) reviewed with a critical mind the published palaeontological evidence for the corals and bivalves. Later, Varga, Denis & Varga (1998), Williams (2000), and Denis et al (2002) have summarized the available information on palaeo-LOD data both for the Phanerozoic (Pz) and the Proterozoic (Ptz) aeons. The latter information is sketched in Fig.…”

Section: Rate Of Change Of Lod In the Geological Pastmentioning

confidence: 99%

Length of the day and evolution of the Earth's core in the geological past

et al. 2011

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In this paper, we study quantitatively the effect of the Earth's core formation on the secular rate of change of the length of day (LOD). We find that for the present epoch, a growth rate of the core comprised between 1 and 10 mm/cy seems to be a plausible guess, leading to a relative decrease of LOD comprised roughly between 10 and 100 μs/cy. Such values do not affect significantly the observed secular increase of LOD caused by tidal braking, which amounts to about 1.79 ms/cy. However, in the remote geological past, before the Phanerozoic, the effects of core growth may have been much more important, because the total change of LOD associated with core formation has been estimated by Birch in 1965 to be 2.4 hours for an initially undifferentiated cold Earth, and 3.1 hours for an initially undifferentiated hot Earth. We consider a number of scenarios, some of them corresponding to very early and/or very fast core formation, others corresponding to slow and/or late core formation. We show that palaeo-LOD measurements seem to favour slow core formation during the Proterozoic, contrarily to the now largely prevailing hypothesis based on geochemical arguments that the iron core formed very early in the Earth's history and during a geologically short time interval.

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Section: Rate Of Change Of Lod In the Geological Pastmentioning

confidence: 99%

Length of the day and evolution of the Earth's core in the geological past

et al. 2011

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“…One of the forces mentioned before is the tidal friction, which produces a westward drift of the continental plates and which is strong enough to serve among the driving mechanisms of plate tectonics (Denis et al;2002;Riguzzi et al, 2010). The second force which possibly able to move the plates is the "pole-fleeing" force, caused by the horizontal component of the centrifugal acceleration, due to Earth's spinning.…”

Section: Motion Of Continental Plates Under the Influence Of Global Fmentioning

confidence: 99%

Evolution of the oceanic and continental crust during Neo-Proterozoic and Phanerozoic

Varga

Krumm

Grafarend

et al. 2014

Rend. Fis. Acc. Lincei

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In present contribution palaeogeographical maps for the time interval 0.6 Ga BP to present are analyzed in terms of (a) the ratio between continental to oceanic crust areas in order to estimate the speed of continental growth, and (b) the surface motion of continental plates under the influence of global forces of tidal friction and Eötvös force ("pole-fleeing"). It is concluded that the area of the continents during the Phanerozoic was growing and it exhibited a rate ~0.5 km 3 /yr. It is also found that beside the westward oriented tidal frictional forces the Eötvös force can play also a role in tectonical processes. It is shown that the continental plates on average tend to find a position close to the equator during the whole investigated 600 Ma time interval.

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“…The maximum number of VDM values used in this study fall in the intervals of 0-10 Ma (1828 determina tions), [10][11][12][13][14][15][16][17][18][19][20] In the Paleozoic, there are several maxima of the dipole moment at 530-560 Ma (the Lower Cambrian: an absolute value of up to 7. ).…”

Section: Marine Geologymentioning

confidence: 99%