Keywords : Factor Analysis


Diagensis and Factor Analysis of Sandstones of Injana Formation in Selected Sections Northern Iraq

Nabil Y. Al-Banna; Thamer A. Aghwan

Iraqi National Journal of Earth Sciences, 2008, Volume 8, Issue 1, Pages 11-23

Three sections of Injana Formation are studied in selected areas at Northern Iraq. Tewenty seven samples of sandstone are chosen for point counting and diagensis studies. The classification of these sandstone beds are feldspathic litharenite. A diagenetic study elucidates the presence of carbonate, iron oxide, clay and silicate cements, as well as compaction, replacement, recrystallization and alteration processes.
Factor analysis shows three main factors controlling the distribution of mineral and rock fragments in sandstones reflecting the type of source rocks and the maturity of the sandstone beds. The first is diagensis , the second is metamorphism of the source rocks, while the third factor is the mechanical erosion of the source rocks. The study of minerals and factor analysis indicate an acidic igneous rocks affected by differential metamorphism of the source rocks with sedimentary rock (carbonate and clastic) and immature texture of sandstone rocks.

Factor Analysis of Water Quality in Hit–Cubaisa Area, West of Iraq

Mohammed Faozy Omer Khattab

Iraqi National Journal of Earth Sciences, 2004, Volume 4, Issue 1, Pages 98-110

This study involves the use of factor analysis technique to evaluate the chemical analysis results of (58) water samples taken from Hit-Cubaisa in the western part of Iraq.
The samples were taken for two periods. An analyzing scheme, which includes correlation and factor analysis, is adopted. Fourteen variables representing measurements and chemical analysis of water sample, were considered for each period .The scheme is applied first to the samples of each period separately and then to the samples of both periods together.
When the scheme is applied separately to each period, correlation analysis has shown the effect of (pH) and (T) on the concentration of same element for both period samples. Besides, the analysis has shown that the amount of (TDS) is related to concentration of element (Ca, Mg, Na and Cl) for the first periods samples and it is related to concentration of elements (Ca,Mg,Na,Cl, K,and H2S) .
The results of factor analysis have shown the domination of two factors have different ratio depend on season of measurements. The first is the rock nature and the second is the environmental condition of the samples.
When the scheme is applied to the samples of both periods, the results of correlation analysis were similar to those of the first period sample. Factor analysis in this case has shown the domination of the same factor. This result indicates to the stability of the environmental condition effect factor and limited effect of rainfall on the water quality through short period of time after rainfall.