A Case for Brittle Deformation of the Basement During the Laramide Revolution in the Rocky Mountain Foreland Province

V. Matthews
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引用次数: 5

Abstract

Debate over the question of whether basement rocks folded or faulted during the Laramide orogeny in the Wyoming province of the Rocky Mountain foreland has raged for many years. Proponents of one view or the other have drawn support for their case from theoretical arguments, from experimental laboratory results, from interpretations of seismic and subsurface borehole data, and from direct observation of surface outcrops and subsurface mine exposures. An analysis of the validity and applicability of these various approaches included the generation of synthetic seismic sections and an evaluation at balanced cross sections. This analysis indicated that the notion of a folded basement is supported only by the interpretation of seismic and borehole data whereas the concept of brittle deformation of the basement is supported by all of these lines of reasoning, interpretation, and observation. The conclusion is that structural basement did not fold during the Laramide orogeny.
落基山前陆省拉腊米革命期间基底脆性变形的一个实例
关于在落基山脉前陆的怀俄明州的拉拉米造山运动中,基底岩石是褶皱的还是断裂的,这个问题的争论已经持续了很多年。这种或那种观点的支持者从理论论证、实验室实验结果、对地震和地下钻孔数据的解释以及对地表露头和地下矿山暴露的直接观察中为他们的观点提供了支持。对这些不同方法的有效性和适用性的分析包括合成地震剖面的生成和平衡截面的评估。这一分析表明,褶皱基底的概念仅由地震和钻孔数据的解释支持,而基底脆性变形的概念由所有这些推理、解释和观察线支持。结论是拉腊胺造山运动期间构造基底未发生褶皱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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