Abstract
Fluid inclusions in halite are widely used in research to determine the conditions of sedimentation in salt basins and reconstruct the chemical composition of seawater during a specific geological period. However, previous preliminary studies of the genetic types of inclusions, considered in the present research project, have not received due attention. Consequently, we decided to take into account the main distinguishing features of fluid inclusions in halite, belonging to various genetic types. The ultramicrochemical analysis (UMCA) method is one of the several methods that are used for the quantitative determination of the chemical composition of the primary fluid inclusions in halite. We have upgraded that technique, and that allowed us to reduce the analytical error rates of each component determination. The error rates were calculated in the study of Ca-rich and SO4-rich types of natural sedimentary brines.
Highlights
Fluid inclusions in halite constitute sources of information on the composition of seawater in the ancient oceans, e.g., [1,2,3,4], as well as the conditions of mineral crystallization in salt deposits [5,6,7]and others
The average volume of the brine contained in the fluid inclusions of halite is in a range from 0.00n to 0.00000n mm3, and such micro quantities of brines exclude the use of any conventional methods of chemical analysis to determine the quantitative chemical composition
The ultramicrochemical method (UMCA) method differs from other similar techniques by the simplicity of methodological operations, the speed of obtaining data, and low cost
Summary
Fluid inclusions in halite constitute sources of information on the composition of seawater in the ancient oceans, e.g., [1,2,3,4], as well as the conditions of mineral crystallization in salt deposits [5,6,7]. The ultramicrochemical method (UMCA) for studying the brines from fluid inclusions in halite was developed at the end of the 1960s by O.I. Petrychenko [10]. Works have been published on the successful use of laser ablation inductively coupled plasma mass spectrometry (the LA-ICP-MS method) for the study of brines from fluid inclusions in halite [15,16,17]. The UMCA method differs from other similar techniques by the simplicity of methodological operations, the speed of obtaining data, and low cost. Middle Miocene (Badenian) halite,(Badenian) in the context of the preselection of fluid inclusions, for a correct interpretation of the data obtained. Fluid inclusions of genetic typestypes are distinguished in halite: primary and and secondary [18,19,20]
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