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USE OF MAGNETIC SUSCEPTIBILITY DATA FOR THE LITOLOGYCAL ANALYSIS AND TO ESTABLISH THE SEDIMENTATION RATE IN A HYDROGRAPHICAL BASIN FROM THE SUB-CARPATHIAN AREA OF ROMANIA
Abstract
The use of magnetic susceptibility data in order to determine the lithology of river and lakes deposits has become an efficient and rapid method of analyzing sedimentary material. This paper aims to achieve both a more accurate determination of sediment lithology based on the study of the magnetic susceptibility of the cores extracted from the bottom of the rivers, as well as the rate of deposition. The sediment lithology and the deposition rate represent the most important information for the characterization of the evolution of hydrographic system parameters of a river. By means of this parameter we can determine both the flow velocity of the water on the main course and the variance of the flows of the tributaries. From a lithological point of view sediments are divided into the following categories: detritical fraction, total organic matter and the carbonatic component. To determine magnetic susceptibility we will use a KLY-2 kappabridge and a Bartington susceptibilimeter with two-frequency MS 2b sensor. In the case of the use of orientated samples, a determination of susceptibility anisotropy can also be obtained. The study of susceptibility allows us to detect several depositional types depending on dominant sedimentary components: high content of detritical matter, low content of organic matter, high content of detritical matter and high content of carbonate matter, high content of detritical matter and low content of carbonate matter. The study of the anisotropy of susceptibility allows the analysis of the variation of the flow direction of the river during the sedimentation of the analyzed sample. This method correlated with sedimentological analysis techniques (granulometry, argilous mineral content analysis through x-ray diffractometry and optical microscopy study) allows for a complete characterization of the course of a river.
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