从类似利斯冈的模式推导出流速和初始浓度

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Geophysical Research: Solid Earth Pub Date : 2024-09-18 DOI:10.1029/2024JB029379
Chong Liu, Victor M. Calo, Klaus Regenauer-Lieb, Manman Hu
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引用次数: 0

摘要

斑马岩以赤铁矿(氧化铁)的红褐色条纹、棒状和斑点为特征,展示了在远非平衡条件下形成的复杂自组织模式。尽管它们很容易识别,但图案形成过程的内在机制仍然难以捉摸。我们引入了一种新颖的平流主导相场模型,该模型能有效复制在斑马岩中观察到的李斯钢样图案。这种数值模型利用了相分离的概念,这是一种在二维环境中管理李斯干现象的成熟原理。我们的研究结果表明,初始溶质浓度和流体流速是决定图案形态的关键因素。我们定量地解释了特定李斯钢样板类别的间距和宽度。此外,该模型还证明,初始浓度过低会促进斜纹的形成,而倾斜角度则受岩石异质性的影响。此外,我们还为正交带建立了带厚度与地质参数之间的定量关系。这样就能仅根据在斑马岩中观察到的静态图案来确定关键地质参数的特征,从而为了解斑马岩的形成环境提供有价值的信息。斑马岩中的各种形态与在早期地球和火星上观测到的形态(如带状铁构造和赤铁矿球)有相似之处。因此,我们的模型为这些图案的形成机制提供了合理的解释,并为破译其起源的地球化学环境提供了有力的工具。
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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Deriving Flow Velocity and Initial Concentration From Liesegang-Like Patterns

Zebra rocks, characterized by their striking reddish-brown stripes, rods, and spots of hematite (Fe-oxide), showcase complex self-organized patterns formed under far-from-equilibrium conditions. Despite their ease of recognition, the underlying mechanisms of pattern-forming processes remain elusive. We introduce a novel advection-dominated phase-field model that effectively replicates the Liesegang-like patterns observed in Zebra rocks. This numerical model leverages the concept of phase separation, a well-established principle governing Liesegang phenomena in a two-dimensional setting. Our findings reveal that initial solute concentration and fluid flow velocity are critical determinants in pattern morphologies. We quantitatively explain the spacing and width of a specific Liesegang-like pattern category. Furthermore, the model demonstrates that vanishingly low initial concentrations promote the formation of oblique patterns, with inclination angles influenced by rock heterogeneity. Additionally, we establish a quantitative relationship between band thickness and geological parameters for orthogonal bands. This enables the characterization of critical geological parameters based solely on static patterns observed in Zebra rocks, providing valuable insights into their formation environments. The diverse patterns in Zebra rocks share similarities with morphologies observed on early Earth and Mars, such as banded iron formations and hematite spherules. Our model, therefore, offers a plausible explanation for the formation mechanisms of these patterns and presents a powerful tool for deciphering the geochemical environments of their origin.

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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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