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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Terminal suturing of Gondwana and the onset of the Ross–Delamerian Orogeny: the cause and effect of an Early Cambrian reconfiguration of plate motions
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Terminal suturing of Gondwana and the onset of the Ross–Delamerian Orogeny: the cause and effect of an Early Cambrian reconfiguration of plate motions

机译：冈瓦纳的最终缝合和罗斯-德拉默造山运动的开始：早期寒武纪板块运动重构的原因和影响

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摘要

A review of U–Pb age data from intrusive and volcanic rocks for Antarctica and Australia has highlighted the remarkable synchronicity in the shift from passive margin or continental arc tectonism, to convergent orogenesis along the Pacific margin of Gondwana. This event, the Ross–Delamerian Orogeny, marks a distinct and rapid shift in the style of deformation, rate of uplift, volume of magmatism and syn-orogenic sedimentation along the entire 4000+ km length of the orogen. The Ross–Delamerian Orogeny is constrained to have begun at 515±5 Ma, an interval that also encompasses the youngest collisional events that lead to the suturing of Gondwana. We propose that these geographically separate events are intimately linked and represent the cause and effect of a major tectonic reorganisation in the motion of the Earth's plates. We suggest the mechanism controlling this Early to Middle Cambrian plate reorganisation was the rapid reduction in relative motion, driven by continental collision, between the final two components of Gondwana. Due to the need to maintain a zero sum for all plate motions, the change in the rate of convergence at this boundary resulted in compensatory changes elsewhere in the global plate circuit. One such change was an increase in the rate and perhaps direction of convergence along the Pacific margin of Gondwana.
机译：对来自南极洲和澳大利亚的侵入性和火山岩中U-Pb年龄数据的回顾，突显了从被动边缘或大陆弧构造运动到冈瓦纳太平洋边缘汇聚造山运动的显着同步性。罗斯-德拉默造山运动这一事件标志着造山带的整个4000+ km长度上的变形方式，上升速度，岩浆活动量和同造山作用沉积发生了明显而迅速的转变。罗斯-德拉默造山运动被限制在515±5 Ma开始，这个时间间隔还包括导致刚多纳缝合的最年轻的碰撞事件。我们建议将这些地理上分开的事件紧密联系起来，并代表地球板块运动中主要构造重组的因果关系。我们建议控制这种早至中寒武世板块重组的机制是冈瓦纳的最后两个组成部分之间由大陆碰撞驱动的相对运动迅速减少。由于需要将所有极板运动的总和保持为零，因此该边界处会聚速率的变化导致整体极板电路中其他位置的补偿性变化。这样的变化之一是沿着冈瓦纳太平洋边缘的汇聚率或方向的增加。

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