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Events in the Precambrian history of the earth : challenges in discriminating their global significance

机译:前寒武纪历史上的事件:区分其全球意义的挑战

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摘要

This paper discusses geological events with an approximately global preservational scale which can aidinter-cratonic correlations and contribute to postulates of supercontinents for a set of chosen Precambriancratons. The chronological scale of such events is highly variable, and most event types detailed(supercontinent-, mantle plume-, orogenic-, chemostratigraphic-, glacial events and major unconformities)have durations concomitant with the large-scale interaction of mantle thermal and plate tectonicprocesses that were largely responsible for their genesis, i.e. 10s to 100s of millions of years. Geologicallyinstantaneous events of global compass (e.g., impact or major eruptive events) provide importantchronological markers for interpreting the longer term events. The same interplay of tectono-thermalgeodynamic processes that drives the evolution of the Earth and the operation of its supercontinentcycles is also, ultimately, responsible for and of comparable duration to first- and second-order sequencestratigraphic cyclicity. This paper thus serves to introduce these concepts and discuss the problems intheir application to specific Precambrian cratons, in relation to the aim of this special issue, of providinga set of accommodation curves for many of these ancient crustal terranes.
机译:本文讨论了具有大致全球保存规模的地质事件,该事件可以辅助克拉通之间的相关性,并有助于为一组选定的前寒武纪的超大陆假设。这些事件的时间尺度是高度可变的,并且详细描述的大多数事件类型(超大陆,地幔羽,造山运动,化学地层学,冰河事件和主要不整合面)的持续时间都与地幔热和板块构造过程的大规模相互作用有关。这是造成它们成因的主要原因,即十亿到一亿亿年。全球罗盘的地质瞬时事件(例如撞击或重大喷发事件)为解释长期事件提供了重要的年代学标记。最终,与一阶和二阶序列地层学周期性相关的持续时间也与驱动地球演化及其超大陆周期运行的构造-热地球动力学过程相互作用相同。因此,本文旨在介绍这些概念,并讨论与特定前寒武纪克拉通的应用有关的问题,与本期特刊的目的有关,为许多这些古老的地壳地形提供一套适应曲线。

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