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Episodic tectonic plate reorganizations driven by mantle convection

机译:地幔对流驱动的大地构造板块重组

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Periods of relatively uniform plate motion were interrupted several times throughout the Cenozoic and Mesozoic by rapid plat reorganization events [R. Hey, Geol. Soc. Am. Bull. 88 (1977) 1404-1420; P.A. Rona, E.S. Richardson, Earth Planet. Sci. Lett. 40 (1978) 1-11; D.C. Engebretson, A. Cox R.G. Gordon, Geol. Soc. Am. Spec. Pap. 206 (1985); R.G. Gordon, D.M. Jurdy, J. Geophys. Res. 91 (1986) 12389-12406; D.A. Clague, G.B. Dalrymple, US Geol. Surv. Prof. Pap. 1350 (1987) 5-54; J.M. Stock, P. Molnar, Nature 325 (1987) 495-499; C. Lithgow-Bertelloni, M.A. Richards, Rev. Geophys. 36 (1998) 27-78]. We present an alternative hypothesis: convection-driven plate motions are intrinsically unstable due to a buoyant instability that develops as a result of the influence of plates on an internally heated mantle. This instability, which has not been described before, is responsible for episodic reorganizations of plate motion. Numerical mantle convection experiments demonstrate that high-Rayleigh number convection with internal heating and surface plates is sufficient to induce plate reorganization events, changes in plate boundary forces, or plate geometry, are not required.
机译:在整个新生代和中生代,板块运动相对均匀的时期被快速的板块重组事件中断了几次[R.嘿,Geol。 Soc。上午。公牛。 88(1977)1404-1420; P.A.罗纳(E.S.)理查森,地球行星。科学来吧40(1978)1-11; D.C. Engebretson,A.Cox R.G.戈登,地质学家。 Soc。上午。规格爸爸206(1985); R.G.戈登(D.M.) Jurdy,J。Geophys。 Res。 91(1986)12389-12406; D.A.克莱格(G.B.)美国地质学家达勒姆普。生存爸爸教授1350(1987)5-54; J.M. Stock,P.Molnar,Nature 325(1987)495-499;和C. Lithgow-Bertelloni,M.A。Richards,Rev。Geophys。 36(1998)27-78]。我们提出了另一种假设:对流驱动的板块运动本质上是不稳定的,这是由于板块对内部加热的地幔的影响而产生的浮力不稳定。这种不稳定状态(以前没有描述过)是导致板块运动发生偶发性重组的原因。数值对流对流实验表明,内部加热和表面板对流的高瑞利数对流足以引发板块重组事件,不需要板边界力或板几何形状的变化。

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