氯在硅酸盐熔体中的溶解度:新实验和热力学混合模型

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
L. Y. Aranovich, M. A. Golunova, J. A. D. Connolly, M. V. Ivanov
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引用次数: 0

摘要

摘要 我们提供了关于Cl在共晶成分透辉石(Di)-橄榄石(Ab)和透辉石±石英(Qtz)模型玄武岩熔体中溶解度的新实验数据。在 900-1200°C 的温度范围内,用 NaCl-CaCl2 水溶液在 4 千巴条件下平衡起始玻璃。实验表明,随着流体中 NaCl 的增加,Cl 的溶解度会降低。熔体和流体之间的钙呐分配每周都与温度有关,与斜长石-流体系统相似。新获得的实验数据与之前发表的关于存在(Na,K)Cl 盐水的花岗岩熔融模型结果(Aranovich 等人,2013 年)一起,用于校准硅酸盐熔体中盐物种(NaCl、KCl 和 CaCl2)的经验热力学模型。计算结果表明,随着流体(以及相应的熔体)中 K/Na 比率的增加,Cl 在单斜体熔体中的溶解度降低。根据获得的熔体和流体中 Ca 和 Na 的分配数据,可以模拟玄武岩熔体结晶过程中 Ca/Na 比率的演变。在高压(10 千巴)下,Cl 在模型花岗岩中的溶解度随着 Н2О 含量的增加而增加。计算得到的简单伪三元体系 Ab-H2O-NaCl 的相图显示了复杂的相关系,并相应地显示了熔体中 Н2О 和 NaCl 浓度的演变。巴德扎尔火山-岩浆岩带 Verkhneurmisskii 地块花岗岩中石英托管熔体和流体包裹体的成分数据说明了这种复杂的演变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Chlorine Solubility in Silicate Melts: New Experiments and Thermodynamic Mixing Model

Chlorine Solubility in Silicate Melts: New Experiments and Thermodynamic Mixing Model

We present new experimental data on Cl solubility in model basalt melts of eutectic compositions diopside (Di)–albite (Ab) and Di–anorthite ± quartz (Qtz). The starting glasses were equilibrated with aqueous NaCl–CaCl2 fluid at 4 kbar in the temperature range of 900–1200°C. The experiments show that Cl solubility decreases with increasing NaCl in the fluid. Ca–Na partitioning between melts and fluid is weekly temperature dependent and resembles that of the plagioclase–fluid system. The newly obtained experimental data, along with previously published results on the model granite melting in the presence of (Na,K)Cl brines (Aranovich et al., 2013), are used to calibrate an empirical thermodynamic model for salt species (NaCl, KCl, and CaCl2) in silicate melt. Calculations show that Cl solubility in haplogranite melt decreases with increasing K/Na ratio in the fluid (and correspondingly, melt). The data acquired on Ca and Na partitioning between melt and fluid make it possible to model the evolution of the Ca/Na ratio in the crystallization course of basalt melts. At a high pressure (10 kbar), Cl solubility in model granite increases with increasing Н2О content. The calculated phase diagram for a simple pseudo-ternary system Ab–H2O–NaCl demonstrates complex phase relations and, correspondingly, evolution of the Н2О and NaCl concentrations in the melt. This complex evolution is illustrated by data on the composition of quartz-hosted melt and fluid inclusions from granites in the Verkhneurmisskii massif in the Badzhal volcano-plutonic zone.

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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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