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引用次数: 0
摘要
板块的动态沉降和隆升通常用地幔中密度异常的垂直运动来解释。这种模式预测地表垂直运动速率在长波长下小于100 m Myr−1,时间跨度为几十Myr。然而,在海平面相对稳定的时期,板块稳定部分的某些垂直运动阶段发生的速率大于100米迈r−1,而这些阶段可能只持续几个迈r。在这里,我们表明,垂直表面运动的速率大于100 m Myr−1,持续时间小于几个Myr,可以用相对于软流层的粘性板块的水平运动变化引起的基底剪切应力的变化来解释。我们将我们的物理模型应用于澳大利亚南缘短暂的中始新世浸没。
Brief immersion of southern Australia by change in relative plate speed
Dynamic subsidence and uplift of plates are often explained by the vertical motion of density anomalies in the mantle. Such models predict surface vertical motion rates of less than 100 m Myr−1 at long‐wavelengths with a timespan of tens of Myr. However, during periods of relative sea‐level stability, some of the phases of vertical motion on stable portions of plates have occurred at rates greater than 100 m Myr−1 during episodes that may last only a few Myr. Here, we show that vertical surface motions, with rates greater than 100 m Myr−1 and durations less than a few Myr, can be explained by changes in basal shear stress caused by variation in horizontal motion of a viscous plate relative to the asthenosphere. We apply our physical model to the short‐lived mid‐Eocene immersion of the southern margin of Australia.
期刊介绍:
Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.