Elasticity of mixtures and implications for piezobarometry of mixed-phase inclusions

IF 1.8 3区地球科学 Q2 MINERALOGY

European Journal of Mineralogy Pub Date : 2023-07-11 DOI:10.5194/ejm-35-461-2023

Ross J. Angel, M. Mazzucchelli, K. Musiyachenko, F. Nestola, M. Alvaro

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引用次数: 1

Abstract

Abstract. Elastic thermobarometry (or piezobarometry) is the process of determining the P (pressure) and T (temperature) of entrapment of inclusions from their pressure, stress or strain measured when their host mineral is at room conditions. The methods and software used for piezobarometry are currently restricted to inclusions consisting of single phases. In this contribution we describe the theory of the elasticity of mixtures of different phases and combine it with the existing isotropic analysis of the elastic interactions between single-phase inclusions and their hosts to calculate the inclusion pressures of mixed-phase inclusions. The analysis shows that the reliability of calculated entrapment conditions for mixed-phase inclusions, including those containing fluid plus minerals, depends in a complex way upon the contrasts between the elastic properties of the host and the phases in the inclusion. The methods to calculate the entrapment conditions of mixed-phase inclusions have been incorporated into the EosFit7c program (version 7.6) that is available as freeware from http://www.rossangel.net.

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混合物的弹性及其对混合相包裹体压压测量的意义

摘要弹性热气压测定法(或称压压测定法)是根据包裹体的压力、应力或应变测定包裹体在室温条件下包裹体的压力和温度的过程。用于压力计的方法和软件目前仅限于由单相组成的内含物。在这篇贡献中，我们描述了不同相混合物的弹性理论，并将其与现有的单相包裹体及其宿主之间弹性相互作用的各向同性分析相结合，计算了混合相包裹体的包裹压力。分析表明，混合相包裹体(包括含流体和矿物的包裹体)的包裹条件计算的可靠性在很大程度上取决于包裹体中矿体和相的弹性特性之间的对比。计算混合相包裹体夹带条件的方法已纳入EosFit7c程序(7.6版)，该程序可从http://www.rossangel.net获得免费软件。

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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来源期刊

European Journal of Mineralogy 地学-矿物学

CiteScore

2.80

自引率

9.50%

发文量

审稿时长

6-12 weeks

期刊介绍： EJM was founded to reach a large audience on an international scale and also for achieving closer cooperation of European countries in the publication of scientific results. The founding societies have set themselves the task of publishing a journal of the highest standard open to all scientists performing mineralogical research in the widest sense of the term, all over the world. Contributions will therefore be published primarily in English. EJM publishes original papers, review articles and letters dealing with the mineralogical sciences s.l., primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, but also biomineralogy, environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.