Fluid and solid inclusions in large halite veins in the Kłodawa Salt Dome (Central Poland) – insights into its development

IF 0.9 4区 地球科学 Q3 GEOLOGY Geological Quarterly Pub Date : 2024-07-06 DOI:10.7306/gq.1748
Tomasz Toboła
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Abstract

Secondary rocks are often found in salt domes. Among these, large halite crystal (LHC) veins and nests are common, as in the Kłodawa Salt Dome of Poland. Mineralogical tests carried out on LHC here showed the presence of fluid and solid inclusions in the halite crystals. The halite itself commonly exhibits birefringence, suggesting lattice stresses. Among the solid inclusions, anhydrite is the most common. Three types of anhydrite crystals have been distinguished as regards their size and occurrence, while small, rounded inclusions of sylvite appear much less frequently. Fluid inclusions are generally rare and mostly of the secondary type. This type of fluid inclusion assemblage (FIA) comprises various kinds as regards their size and shape, as well as in their liquid-to-gas phase ratio. Primary FIAs are of two types: small, chevron-like inclusions containing sylvite daughter minerals, and large liquid-gas inclusions with carnallite and other daughter minerals. The melting temperature of sylvite ranged from 90 to 278°C, and for carnallite from 68 to 142°C. Complete homogenization of the inclusions took place at temperatures between 260 and 471.2°C. This indicates the high-temperature origin of the LHC and the presence of significant amounts of K+, Mg+2, Ca+2, and SO4-2 ions in the solutions.

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克沃达瓦盐丘(波兰中部)大型海绿石矿脉中的流体和固体包裹体--对其发展的启示
在盐穹隆中经常会发现次生岩。其中,大海泡石晶体(LHC)矿脉和矿巢很常见,波兰的克沃达瓦盐穹隆就是如此。对这里的大海泡石晶体进行的矿物学测试表明,海泡石晶体中存在流体和固体包裹体。海绿石本身通常表现出双折射,表明存在晶格应力。在固体包裹体中,无水石膏最为常见。无水石膏晶体的大小和出现情况可分为三种类型,而小而圆的锡石包裹体出现的频率要低得多。流体包裹体一般很少见,而且大多属于次生类型。这类流体包裹体集合体(FIA)的大小、形状以及液相与气相的比例各不相同。原生流体包裹体有两种类型:一种是含有锡石子矿物的小型螯状包裹体,另一种是含有光卤石和其他子矿物的大型液气包裹体。锡石的熔化温度在 90 至 278°C 之间,光卤石的熔化温度在 68 至 142°C 之间。包裹体在 260 至 471.2°C 的温度范围内完全均化。这表明 LHC 源自高温,溶液中存在大量 K+、Mg+2、Ca+2 和 SO4-2 离子。
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来源期刊
Geological Quarterly
Geological Quarterly 地学-地质学
CiteScore
2.20
自引率
0.00%
发文量
19
审稿时长
>12 weeks
期刊介绍: The policy of the Geological Quarterly is to publish significant contributions of information and geological insight relevant to an international readership. The journal has been issued since 1957 at the Polish Geological Institute - National Research Institute and, at present, is the leading Earth sciences journal in Poland. All aspects of Earth and related sciences, and universal and broad regional rather than locally oriented topics are covered. The journal is intended to be an international forum for the exchange of information and ideas, particularly on important geological topics of Central Europe.
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