In contact metamorphism ( metamorphism caused by high temperatures at low pressure in the vicinity of an igneous intrusion ) a local contact aureole of zones is formed around a heat source.
22.
A subgroup is the andalusite-, staurolite-, kyanite-and sillimanite-schists which usually make their appearance in the vicinity of gneissose granites, and have presumably been affected by contact metamorphism.
23.
Deposits containing dolomite and siderite also readily yield amphibolites ( tremolite-schists, grunerite-schists, and others ) especially where there has been a certain amount of contact metamorphism by adjacent granitic masses.
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The size of the aureole depends on the heat of the intrusion, its size, and the temperature difference with the wall rocks . ultramafic intrusions can have significantly thick and well-developed contact metamorphism.
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In 1912 Goldschmidt got the most distinguished Norwegian scientific award ( the Fridtjof Nansen belonning ) for his dissertation on the topic of " Die Kontaktmetamorphose im Kristianiagebiet " ( " The contact metamorphism around Kristiania ).
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Additionally, bicchulite can be formed during the cooling episode of contact metamorphism, where the rock s texture is changed because of exposure to pressure and extreme temperatures from magma, or by metasomatism, which alters the rock chemically by hydrothermal fluids.
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Green chlorite, green garnet, and talc are associated with the asbestos veins, which occur in a 0.6-to-0.9 m ( 2-to-3 ft ) thick contact metamorphism zone associated with basaltic sills.
28.
Most of Mount Slesse is made up of granitic rocks related to the Chilliwack batholith, which intruded the region 26 to 29 million years ago after the major Darrington Phyllite, a metamorphic rock, produced by contact metamorphism with the rock of the Batholith and with an intrusion of granodiorite.
