DESCRIPTIONS OF PILLOW BASALTS FROM ICELAND
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Date
2019-05
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Publisher
The Ohio State University
Abstract
Twenty-five thin sections were prepared from different rock samples collected from two
different locations in Iceland. Two of the rock samples are pillow lavas from the Miðfell area,
other samples are xenoliths also from the Miðfell area, and the last are also samples of pillow
lavas, collected from the Undirhlíðar area. Nine thin section were made from one pillow basalt
from Midfell. Six other thin section are from a different pillow basalt near the same location at
Midfell. Five thin sections were made from pillow basalts from locations near the Undirhlíðar
area. A set of thin sections include five made from different xenoliths collected from the Miðfell
area. The microscope that was used for the identification of minerals and texture is the Leica
DM750P with the following objectives: 4x/0.10 (low magnification), 10x/0.25 (medium
magnification), and 63x/0.75 (high magnification) combined with the eyepiece at a
magnification of 10x/20. The points that will be discussed in this thesis include: (1) the
volcanism of Iceland and the geologic setting from which the samples were retrieved; (2) the
methods and techniques of the petrographic microscope used to identify textures and minerals;
and (3) a detailed description of the igneous textures, mineral composition and mineral
percentage of the four types of samples listed above.
Description
Keywords
Pillow Basalt, Iceland, igneous textures, Glass, description, Miðfell, Undirhlíðar