Tobermory Geology Granite

The pink caledonian granite at the western end of the ross of mull has been worked as a building stone and features locally in iona cathedral.

Tobermory geology granite.

Intrusion of the ross of mull granite. It forms from the slow crystallization of magma below earth s surface. Tobermory is a small community located at the northern tip of the bruce peninsula in the municipality of northern bruce peninsula it is 300 kilometres 190 miles northwest of toronto the closest city to tobermory is owen sound 100 kilometres 62 miles south of tobermory and connected by highway 6 due to similar harbour conditions it was named after tobermory ˌ t oʊ b ər ˈ m ɔːr i. Granite has a felsic composition and is more common in recent geologic time in contrast to earth s ultramafic ancient igneous history.

Skip to main content. In geology granite is one specific thing. All the errratics are found west of the granite not east thereby indicating the direction of ice flow. The main folding and metamorphism of moine and dalradian rocks occurred.

Mull s oldest rocks formed way south in the southern hemisphere and mull in common with the british isles has gradually drifted northwards to its present day position. On the shore of loch na keal a feature called p forms can be seen channels cut in the rock by glaciers. An igneous rock that is coarse grained and overall light colored. Deposition of sands and limy muds on top of the precambrian rocks.

Glacial erratic boulders of granite are found in iona scouring of the rocks by ice is clear in many places. Over geological time it has undergone enormous changes. But in the parlance of the natural stone industry the definition of granite is expanded to include all igneous rocks as well as many metamorphic rocks like gneiss and schist. Fm tm ub spc i ocean closed.

Mull has not always been in its present position and form. Iona is covered in erratic boulders that is great lumps of granite that have been carried westwards by the glaciers that once covered the area. It may also be found in the lighthouses at skerryvore and ardnamurchan point and much further afield in the albert memorial and blackfriars and westminster bridges in london. Felsic rocks are less dense than mafic and ultramafic rocks and thus they tend to escape subduction whereas basaltic or gabbroic rocks tend to sink into the mantle beneath the granitic rocks of the continental cratons.

Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals. Now only seen to the north of mull.