Badania geochemiczne osadów węglanowych cechsztynu z otworu wiertniczego Grzybnica IG 1 z zastosowaniem analizy czynnikowej – sposób R

Halina Ważny, Przemysław Stenzel

Abstract


AN INTERPRETATION OF GEOCHEMICAL DATA CONCERNING CARBONATE ZECHSTEIN DEPOSITS FROM BOREHOLE GRZYBNICA IG 1 BY MEANS OF FACTOR ANALYSIS - R MODE

Summary

The authors present preliminary results obtained in the interpretation of geochemical data by means of a mathematical method, known as factor analysis (R mode). This is one of those mathematical statistical methods which allow us to determine certain hypothetical concepts referred to as factors. On the one hand, these factors may throw some light on the origin of a given environment; on the other, they may indicate the causes which lead to changes within this environment.

The method concerned is based on an assumption that there is a linear function between certain characteristics and these factors. In the study described here, the characteristics were the following elements, subdivided into two groups: Cl, Ba, V, Ni, Pb, Ti, Fe and Mn, Sr, F, Cu. The first group is connected with the clayey and detrital fraction in the deposits, which represents mainly the terrigenous components of these deposits; the second group is connected with the chemical precipitation of the deposits. A certain part of the concentration of these elements if of biogenic origin.

The authors used this mathematical analysis for an interpretation of chemical data to check whether the elements examined here are really genetically connected and can be subdivided into two or more groups and to determine in which associations they occur in the whole interval concerned and in which associations they are found in the particular sedimentation horizons.

The factor analysis was applied here to geochemical data from the whole Zechstein column, treated as one class of data, and to geochemical data from three sedimentation horizons, analysed as three seperate classes of data. The analysis shows that differences in the chemical composition of one type of deposits can be explained as due to a few factors. The associations of characteristics (elements) investigated here are controlled by influences of mineral origin, physical and chemical processes, and geochemical relationship between the particular elements. The authors find that changes taking place within the deposits are influenced more by the terrigenous factor than those factors which are due to chemical and biogenic processes.


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