The rheological evolution of a phonotephritic melt upon variable degrees of carbonate assimilation and deformation regimes

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-02-27 DOI:10.1016/j.chemgeo.2025.122711

Gabriele Giuliani , Danilo Di Genova , Fabrizio Di Fiore , Silvio Mollo , Serena Dominijanni , Chiara Maria Petrone , Claudia Romano , Alessandro Vona

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引用次数: 0

Abstract

The dynamic interplay between magmas and carbonate wall rocks within volcanic plumbing systems heavily influences the chemical and physical properties of erupted magmas. In this study we present results from isothermal static experiments (ISEs) and isothermal deformation experiments (IDEs) aimed at investigating the rheological evolution of a phonotephritic melt from Somma-Vesuvius (Italy) under variable shear rates and CaO and CaO + MgO doping levels. Flash differential scanning calorimetry is also used to determine the viscosity of interstitial melt, allowing for the first direct assessment of how crystallization affects melt rheology without relying on empirical viscosity models. Two distinct rheological scenarios emerge from IDEs: 1) a viscous deformation, characterized by uniform flow, and 2) a non-homogeneous deformation, featuring shear localization and viscous/brittle rupture of the magma. As both shear rate and doping level increase, a non-Newtonian melt behavior is observed due to stress localization and rupture, facilitated by the development of the crystal network. The narrower viscosity range measured from IDEs, compared to models of pure viscous behavior, suggests that shear localization and fracturing reduce the resistance to flow in doped, crystal-rich samples. The complex rheology of doped melts reflects the disaggregation of skarn shells at the margins of magma chambers, thereby facilitating skarn recycling and enhancing magma contamination.

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音质熔体在不同程度的碳酸盐同化和变形机制下的流变演化

火山管道系统内岩浆与碳酸盐岩的动态相互作用对喷发岩浆的化学和物理性质影响很大。在这项研究中，我们介绍了等温静态实验（ISEs）和等温变形实验（IDEs）的结果，旨在研究来自意大利Somma-Vesuvius火山的音质熔体在不同剪切速率和CaO和CaO + MgO掺杂水平下的流变演化。闪光差示扫描量热法也用于确定间隙熔体的粘度，允许首次直接评估结晶如何影响熔体流变，而不依赖于经验粘度模型。ide产生了两种不同的流变情景：1)粘性变形，以均匀流动为特征；2)非均匀变形，以剪切局部化和岩浆粘性/脆性破裂为特征。随着剪切速率和掺杂水平的增加，由于应力局部化和破裂，晶体网络的发展促进了非牛顿熔体行为。与纯黏性行为模型相比，ide测量的黏度范围更窄，这表明剪切局部化和压裂降低了掺杂富晶样品的流动阻力。掺杂熔体的复杂流变学反映了岩浆房边缘矽卡岩壳的分解，从而促进了矽卡岩的再循环，增强了岩浆污染。

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.