Determination of the fluctuation of the Caspian sea water in recent century by surveying calcium amounts in coastal sediments-A case study at Sari region

Abstract

<span style="font-size:9.0pt;font-family: " times="" new="" roman","serif";mso-fareast-font-family:"times="" roman";mso-bidi-font-family:="" mangal;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" hi"="" lang="EN-GB">In this study fluctuation of the Caspian Sea level in recent century was determined by surveying the sediments types, facial changes and calcium amount in sediment samples. Study was done by collecting 3 sedimentary cores of the Southern shores of the Caspian Sea in Sari region. In field operation after complete description of the cores and consideration of the color, organic matter content, sedimentation rate and cohesion characteristics, etc, facies were separated and from each facies a sedimentary sample was taken. Findings suggest that there is a positive correlation between the changes in calcium concentration in samples and the Sea water level but a negative correlation between the Sea water level and size of gravel in various periods. Indeed, it was found out that with an increase in the amounts of calcium from surface (new) to depth (old) and decrease in the percentage of gravel from the surface to depth the Sea water level decreases.</span>