An application of GIS analysis on structural data from metamorphic rocks in Santorini Island.

Abstract

The Santorini volcanic island is located in the northern Cretan Sea and is part of the recent subduction-related volcanic arc. The opening of Cretan Sea is the result of extension associated with a series of ductile and brittle detachment faults developed

Implications of Petrography and Geochemistry of Athinios Metamorphic Units Using PXRF and Gis Analyses in Thera (Santorini, Greece).

“…Jolivet et al, 2003;Papazachos et al, 2005). In Santorini, the exposed schists and phyllites at Athinios have shown Miocene (10.9 ± 0.7Ma, ZFT; 9.4 ± 0.3 Ma, AHe) and Eocene (46.3± 2.8 Ma, ZFT; 49.34 ± 2.9 Ma, AHe) exhumation ages (Marsellos et al, 2013) implying a thermal reset in Miocene which is possibly related to a granitic intrusion that took place at 9.5 Ma (Skarpelis et al, 1992).…”

“…Using a previous methodology of k-means cluster analysis in a GIS software (Marsellos et al, 2013) the two metamorphic units were separated through their stretching lineations (with clusters at NNW-Miocene and at NNE-Eocene) values. A representative average of the major elements geochemistry of each unit was calculated, which is summarized in Table 1.…”

“…Using a previous methodology (Marsellos et al, 2013) of separating the two metamorphic units through their stretching lineation (NNW-Miocene and NNE-Eocene) values, we calculated a representative average of the major elements geochemistry of each unit, which is summarized in Table 1. In the GIS software using the kriging function, a series of major and minor elements contour maps were created.…”

“…Santorini metamorphic basement is part of the metamorphic complex called Cycladic Massif. In the study area, a metamorphic unit with Miocene cooling ages is juxtaposed structurally below an Eocene metamorphic unit (Marsellos et al, 2013). Both units have undergone two stages of the Alpine metamorphism: at Eocene high-pressure event producing blueschist-facies assemblages and a Miocene medium-pressure event producing greenschist-facies assemblages (Altherr et al, 1982Andriessen et al, 1979.…”