Statistical approach by factor and cluster analysis on origin of elements from the Hamit Plutonic (Turkey) rock samples

Abstract

The Hamit pluton forms part of the Central Anatolian Crystalline Complex. It is located N-NE of Kaman (Kirsehir). It covers an area of about 120 km2. The geochemical contents of 63 rock samples collected from this pluton were analyzed for their origin, homogeneity and relationship with crustal rocks. Their element contents were determined by using X-Ray Fluorescence spectroscopy. The samples were divided into 2 major groups based on their similarities: Group 1 contained 63.5% of the samples and indicated they were formed from melts whose contents might have evolved greatly due to crustal assimilation; while the 36.5% of samples belonged to Group 2, and show minimal evolution of the melt. According to the variation in K/Rb ratio versus SiO2 and the Rb/Zr versus SiO2 the initial melt had experience great evolution due to crustal assimilation. The initial melt is considered to have contained “most” of SiO2, TiO2, Fe2O3, MnO, MgO, CaO, P2O5, Sr, Zn, Cu, Ni, Co, Cr, Ba, Nd, Sc and V that formed the pluton, while “majority” of the Al2O3, Nb, Zr, U, Th, Pb, Ga, Rb, Ce and La are considered to have been derived from crustal contamination, and “almost all” of Na2O, K2O and Y are considered to have originated from crustal assimilation.

Keywords

• plutonic rocks’ data
• multivariate analysis
• cluster analysis
• factor analysis