水二氧化碳深层流体中 NaCl 和 CaCl2 的分离

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2024-04-22 DOI:10.1134/S0869591124020036
M. V. Ivanov, S. A. Bushmin
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引用次数: 0

摘要

我们研究了改变 H2O-CO2-NaCl-CaCl2 流体异质化后形成的流体相中 NaCl 和 CaCl2 盐浓度比例的可能性,同时降低了 P-T 参数。关于 H2O-CO2-NaCl 和 H2O-CO2-CaCl2 三元体系的一个众所周知的实验事实是,与类似的 H2O-CO2-NaCl 体系相比,H2O-CO2-CaCl2 体系更倾向于分离成主要共存的水相-盐相和水相-二氧化碳相。这一实验事实可以解释为,与 CaCl2 相比,NaCl 对 CO2 的亲和力更大。利用最近开发的 H2O-CO2-NaCl-CaCl2 四元流体系统数值热力学模型,可以确定 NaCl 和 CaCl2 与二氧化碳相互作用的这种差异在地质学上的重大影响。H2O-CO2-NaCl-CaCl2流体多级异质化,P-T参数显著降低,最终形成水相-二氧化碳流体相f2,与初始流体相比,其中的盐成分明显富含NaCl,贫含CaCl2。在每个异质化阶段形成的流体相 f1 主要由水-盐组成,其中 NaCl 和 CaCl2 盐的摩尔分数比与初始流体中的差别不大。然而,f1 相中盐的总摩尔分数通常大大超过初始流体中的总摩尔分数。在 f1 相流体的多级异质化过程中,与 NaCl 和 CaCl2 的初始摩尔分数比相比,没有形成 CaCl2 明显富集的流体。与此同时,f2 相的连续多次分离会导致其盐组分中 NaCl 的富集。在有利条件下,这一过程可导致形成一种几乎含有纯 NaCl 盐的流体。考虑了流体 H2O-CO2-NaCl-CaCl2 盐成分的变化,并将其应用于拉普兰花岗岩带 HP 变质作用和共花岗岩变质作用的 P-T 趋势回归分支的流体成分演变。
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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Separation of Salts NaCl and CaCl2 in Aqueous-Carbon Dioxide Deep Fluids

The possibility of changing the ratio of the concentrations of NaCl and CaCl2 salts in fluid phases formed as a result of heterogenization of the H2O–CO2–NaCl–CaCl2 fluid with a decrease in P-T parameters has been studied. A well-known experimental fact regarding the ternary systems H2O–CO2–NaCl and H2O–CO2–CaCl2 is the greater tendency of the H2O–CO2–CaCl2 system to separate into coexisting predominantly aqueous-salt and aqueous-carbon dioxide phases compared to the similar system H2O–CO2–NaCl. This experimental fact can be interpreted as a greater affinity of NaCl for CO2 compared to CaCl2. Using a recently developed numerical thermodynamic model of the H2O–CO2–NaCl–CaCl2 quaternary fluid system, it was possible to identify geologically significant consequences of this difference in the interaction of NaCl and CaCl2 with CO2. Multistage heterogenization of the H2O–CO2–NaCl–CaCl2 fluid with a significant decrease in P-T parameters ultimately leads to the formation of aqueous-carbon dioxide fluid phase f2, the salt component of which is significantly enriched in NaCl and depleted in CaCl2 compared to the initial fluid. The fluid phase f1 formed at each stage of heterogenization has a predominantly water-salt composition with the ratio of the mole fractions of NaCl and CaCl2 salts, differing little from that in the initial fluid. However, the total mole fraction of salt in the f1 phase, as a rule, significantly exceeds that in the original fluid. The density of phase f1 significantly exceeds the density of phase f2. During the process of multistage heterogenization of the fluid phase f1, there is no formation of a fluid with a significant enrichment of CaCl2 compared to the initial ratio of the mole fractions of NaCl and CaCl2. At the same time, successive multiple separation of the f2 phase leads to the enrichment of its salt component in NaCl. Under favorable conditions, this process can lead to the formation of a fluid with almost pure NaCl salt. Changes in the salt composition of the fluid H2O–CO2–NaCl–CaCl2 are considered in application to the evolution of fluid composition along the regressive branch of the P-T trend of HP metamorphism and syngranulite metasomatism in the Lapland granulite belt.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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