末次第四纪冰期前隆起对陆地垂直运动、海平面变化和岩石圈应力的影响

IF 25.2 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Christian Brandes, Holger Steffen, Rebekka Steffen, Tanghua Li, Patrick Wu
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引用次数: 0

摘要

冰川前隆起是冰川区外的岩石圈与弯曲有关的隆起,它与冰盖下的岩石圈凹陷同时发生。最后一次冰期的前隆起在一个多世纪以来引起了人们的注意,但对前隆起的几何形状的定量描述却很少。虽然许多研究提到前隆起动力学是某一观测的可能原因,但很少有研究对前隆起的精确动力学进行详细和系统的探索。这样,前隆起偶尔就变成了一个相当神秘的结构,有许多未知的东西。我们的目的是阐明前半部分的讨论。在回顾前隆起研究历史的基础上,概述了前隆起时空发展的理论基础和控制因素,并介绍了北美和中欧北部地区的地质和大地测量记录中的前隆起观测结果。我们使用最先进的有限元模型,该模型可以同时拟合末次冰期的多个观测结果,以说明北美和中欧北部的前隆起发展情况,并解决零隆起铰链线是否是前隆起锋面位置的良好指示的问题。最后,我们讨论了前隆起对海平面变化模式和岩石圈应力演化的影响,从而引起板内地震。研究还表明,冰缘外冰前隆起的存在与末次盛冰期均衡的假设不一致,不存在应变率-应力悖论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of the Last Quaternary Glacial Forebulge on Vertical Land Movement, Sea-Level Change, and Lithospheric Stresses

Effects of the Last Quaternary Glacial Forebulge on Vertical Land Movement, Sea-Level Change, and Lithospheric Stresses

A glacial forebulge is a bending-related upheaval of the lithosphere outside a glaciated area that co-occurs to the depression of the lithosphere below an ice sheet. The forebulge of the last glaciation attracted attention over more than one century, but quantitative descriptions on the geometry of the forebulge are rare. While many studies mention forebulge dynamics as a possible cause for a certain observation, very few studies provide a detailed and systematic exploration of the forebulge's precise dynamics. That way the forebulge became occasionally a rather mysterious structure with many unknowns. We aim to shed light into the forebulge discussion. After reviewing the history of forebulge research, we outline the theory behind the spatio-temporal forebulge development including controlling factors, and present forebulge observations in geological and geodetic records of North America and the northern parts of Central Europe. We use a state-of-the art finite-element model that can fit multiple observations of the last glaciation simultaneously, to illustrate forebulge development in North America and northern Central Europe and address the issue of whether the zero-uplift hinge line is a good indication of the location of the forebulge front. Finally, we discuss effects of the forebulge on the sea-level change pattern and the evolution of lithospheric stresses, which can induce intraplate earthquakes. We also show that the existence of a glacial forebulge outside the ice margin is not consistent with the assumption of isostatic equilibrium at the Last Glacial Maximum, and there is no strain rate-stress paradox.

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来源期刊
Reviews of Geophysics
Reviews of Geophysics 地学-地球化学与地球物理
CiteScore
50.30
自引率
0.80%
发文量
28
审稿时长
12 months
期刊介绍: Geophysics Reviews (ROG) offers comprehensive overviews and syntheses of current research across various domains of the Earth and space sciences. Our goal is to present accessible and engaging reviews that cater to the diverse AGU community. While authorship is typically by invitation, we warmly encourage readers and potential authors to share their suggestions with our editors.
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