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Guyot. In marine geology, a guyot (/ ˈɡiː.oʊ, ɡiːˈoʊ /), [1][2] also called a tablemount, is an isolated underwater volcanic mountain (seamount) with a flat top more than 200 m (660 ft) below the surface of the sea. [3] The diameters of these flat summits can exceed 10 km (6 mi). [3] Guyots are most commonly found in the Pacific Ocean ...
Since fine-grained granite is less porous, this "outer skin" sealed the magma body and helped to trap rare elements and water inside. Over time, the water and rare elements were concentrated along the edges of the magma. While the magma cooled and crystallized, the water content of the remaining liquid magma increased rapidly.
Magma that cools slowly within a magma chamber usually ends up forming bodies of plutonic rocks such as gabbro, diorite and granite, depending upon the composition of the magma. Alternatively, if the magma is erupted it forms volcanic rocks such as basalt , andesite and rhyolite (the extrusive equivalents of gabbro, diorite and granite ...
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Mount Tibrogargan. / 26.933°S 152.950°E / -26.933; 152.950. Mount Tibrogargan is a small mountain in the Glass House Mountains National Park, north-northwest of Brisbane, Australia. It is a magma intrusion of hard alkali rhyolite that squeezed up into the vents of an ancient volcano 27 million years ago. [ 1]
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