系统KCl–CaCO3和KCl–MgCO3在6 GPa

IF 1.2 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

High Pressure Research Pub Date : 2022-07-03 DOI:10.1080/08957959.2022.2102426

I. Podborodnikov, A. Shatskiy, A. Arefiev, A. Bekhtenova, K. Litasov

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引用次数: 1

摘要

金刚石熔体包裹体组成从富钾盐酸盐到碳酸盐岩的连续变化表明它们之间可能的成因关系。这引起了人们对高压下氯化物-碳酸盐岩体系研究的兴趣。本文给出了KCl-CaCO3和KCl-MgCO3体系在6 GPa和1000-1600℃条件下相关系的实验数据。所研究的体系具有共晶型的T-X图。亚固相以文石+ KCl和菱镁矿+ KCl为代表。KCl-CaCO3共晶位于1200℃和K2# 20，而KCl-MgCO3共晶位于1400℃和K2# 43，其中K2# = 2KCl/(2KCl + CaCO3 + MgCO3)×100 mol%。水溶性氯化物中K和Cl的浓度以及碳酸盐中Ca、Mg和CO2的浓度表明，被“纤维状”钻石包裹的富K盐流体可能是含有KCl和H2O的碳酸盐熔体的低温衍生物。

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The systems KCl–CaCO3 and KCl–MgCO3 at 6 GPa

ABSTRACT Continuous variations in the composition of melt inclusions in diamonds from K-rich saline to carbonatitic indicate their possible genetic relationship. This causes interest in the study of chloride-carbonate systems at high pressure. Here we present experimental data on phase relations in the KCl–CaCO3 and KCl–MgCO3 systems at 6 GPa and 1000–1600 °C. The studied systems have the eutectic type of T-X diagrams. Subsolidus phases are represented by aragonite + KCl and magnesite + KCl. The KCl–CaCO3 eutectic is situated at 1200 °C and K2# 20, while the KCl–MgCO3 eutectic is located at 1400 °C and K2# 43, where K2# = 2KCl/(2KCl + CaCO3 + MgCO3)×100 mol%. The concentration of K and Cl in water-soluble chloride, and Ca, Mg, and CO2 in carbonate suggests that K-rich saline fluid entrapped by ‘fibrous’ diamonds could be a low-temperature derivative of a carbonatite melt containing KCl and H2O.

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来源期刊

High Pressure Research 物理-物理：综合

CiteScore

3.80

自引率

5.00%

发文量

审稿时长

2 months

期刊介绍： High Pressure Research is the leading journal for research in high pressure science and technology. The journal publishes original full-length papers and short research reports of new developments, as well as timely review articles. It provides an important forum for the presentation of experimental and theoretical advances in high pressure science in subjects such as: condensed matter physics and chemistry geophysics and planetary physics synthesis of new materials chemical kinetics under high pressure industrial applications shockwaves in condensed matter instrumentation and techniques the application of pressure to food / biomaterials Theoretical papers of exceptionally high quality are also accepted.