Analysis of Tektite Clusters in Australian Strewnfield Based on Geochemical Data Using the Hierarchical Average Linkage Method
Romi Lentika Sinaga (a), Triyana Muliawati (a*)

a) Department of Mathematics, Institut Teknologi Sumatera
Jalan Terusan Ryacudu, Lampung 35365, Indonesia
*triyana.muliawati[at]ma.itera.ac.id

Abstract

Tektite is a natural glass material formed by the impact of meteors on the earth^s crust. There are currently 4 strewnfield tektites associated with separate impact and ejection fields: North American, Central-European, Ivory-Coast and Australian. Of the four strewnfields, the Australian strewnfield has the widest distribution. One of them was found on Belitung Island, Indonesia. This study aims to classify tektite in the Australian Strewnfield based on geochemical data and analyze the characteristics of the tektite from the grouping results obtained. The method used is the Hierarchical Average Linkage method with 60 textite data and 8 geochemical composition variables. Principal Component Analysis is carried out to take the k main components that represent the diversity of the data. Before using the average linkage method, the Silhoutte method was used to obtain the k cluster values used for confirmation in the analysis of the results. The results showed that the tektite at Australian Strewnfield formed 3 clusters where the first cluster consisted of 36 samples with the lowest silica but the highest aluminum oxide. The third cluster of 10 samples has the highest silica and the second cluster of 14 samples has silica whose value is between the second and third clusters.

Keywords: Tektite- Australian Strewnfield- Cluster- Average Linkage

Topic: MATHEMATICS AND STATISTICS