Early earth geodynamics: cross examining the geological testimony
Early earth geodynamics: cross examining the geological testimony
复制标题
早期地球地球动力学：交叉检验地质证据
DOI：
10.1098/rsta.2018.0169
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
A. Kemp
中科院分区：
文献类型：
--
作者：
A. Kemp
许多研究将地球上大陆的存在与板块构造的作用联系起来。然而，放射性同位素数据长期以来一直将地壳生成和保存的大部分委托给前寒武纪地球的黑暗领域，由于这些早期地质记录的稀疏和复杂性，主要的地球动力学系统是高度不确定的。本文的目的是研究这种地质记录的性质，考虑到可能破坏其保真度的偏见和人工制品，并评估什么是最强大的证据线，从中可以得出有意义的地球动力学推论。这是追求参考Hadean碎屑锆石，太古宙片麻岩复合体和太古宙花岗岩-绿岩杂岩，并考虑壳幔相互作用的同位素代理。这些证据强化了长期以来的观点，即一些最古老的大陆核的形成涉及一种独特的行星地球动力学模式，这种模式不符合现代风格的板块构造的定义。对最古老的岩石进行详细的询问，整合来自保存最完好的全岩和矿物档案的多尺度信息，并强调在取样和分析阶段的仔细选择，将为早期地球过程的岩石学和热力学模型提供最可靠的输入数据。本文是“地球动力学和板块构造发展”讨论会的一部分。
Many studies link the presence of continents on Earth to the operation of plate tectonics. Radiogenic isotope data have, however, long consigned the bulk of crust generation and preservation to the murky realm of the Precambrian Earth, where the prevailing geodynamic systems are highly uncertain due to the sparse and complex nature of the geological record of these early eons. The purpose of this paper is to examine the nature of this geological record, considering the biases and artefacts that may undermine its fidelity, and to assess what are the most robust lines of evidence from which meaningful geodynamic inferences can be drawn. This is pursued with reference to Hadean detrital zircons, Archean gneiss complexes and Archean granite–greenstone terranes, and by considering isotopic proxies of crust–mantle interaction. The evidence reinforces long held views that the formation of some of the oldest continental nuclei involved a distinctive mode of planetary geodynamics that rests uneasily within definitions of modern style plate tectonics. A detailed interrogation of the oldest rocks, integrating multi-scale information from the best preserved whole-rock and mineral archives, and emphasizing careful selection at the sampling and analytical stages, will lead to the most robust input data for petrological and thermodynamic models of early Earth processes. This article is part of a discussion meeting issue ‘Earth dynamics and the development of plate tectonics’.
影响因子：
64.8
作者：
T. Næraa;A. Schersten;M. Rosing;A. Kemp;J. Hoffmann;T. Kokfelt;M. Whitehouse
通讯作者：
T. Næraa;A. Schersten;M. Rosing;A. Kemp;J. Hoffmann;T. Kokfelt;M. Whitehouse