The Birimian terranes in the south part of the West African craton are a mix of metamorphosed volcanic, sedimentary and plutonic rocks and low grade metavolcanics and metasediments.
32.
The ash has a rhyolitic composition, which is the volcanic equivalent of the plutonic rock granite; it covered what would later become the Grapevine Mountains in of ash.
33.
The formation of melt inclusions appears to be a normal part of the crystallization of minerals within magmas, and they can be found in both volcanic and plutonic rocks.
34.
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.
35.
A high angle east-west fault passing through Hatcher Pass separates the plutonic rocks on the north side of the fault from the Hatcher Pass schist south of the fault.
36.
In the past, the term " Zoroaster Plutonic Complex, " which has been used for all Paleoproterozoic granitic and grandioritic plutonic rocks in the Grand Canyon, has been abandoned.
37.
The uplifted rock masses are either magmatic plutonic rocks, easily shaped because of their higher temperature, or sediments or metamorphic rocks, which have a less robust structure, that are deposited in the synclines.
38.
This structure, formed by plutonic rocks including granodiorite and tonalite, is crossed north-south by the Liqui�e-Ofqui fault zone and surrounded by metamorphic rocks west and volcanic rocks east of the batholith.
39.
This elongate greenstone belt is characterized by Hausel as a synclinorium of metamorphosed volcanic, sedimentary and plutonic rocks that have been regionally metamorphosed to greenschist and amphibolite facies, and locally overprinted by a later retrogressive greenschist facies event.
40.
Exfoliation ( caused by the tendency of crystals in plutonic rocks to expand at the surface ) acting on granitic rock with widely spaced joints is responsible for creating domes such as Half Dome and North Dome and inset arches like Royal Arches.
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