Igneous rock is produced by the melting of the Earth's crust into magma. There are two primary types of igneous rock: intrusive and extrusive. Intrusive igneous rock is produced by the slow cooling of magma below the surface. Extrusive igneous rock is produced by the rapid cooling of lava a...
Click here to learn more about rocks with Geology Rocks 3. Igneous rock comes from molten magma. Molten magma is the very hot stuff you find in volcanos! The magma turns to rock when it cools. There are two different types of igneous rock, depending on if the magma has cooled on the ...
geochemistry, and chronology were conducted in this paper, which reveal that it is composed of granite-monzogranite assemblage (granitoid) and tonalite-trondhjemite-granodiorite assemblage (TTG). The two types of rocks are generally enriched in large ion litho...
HM Lang,P Igneous 摘要: The Classification of Igneous Rocks. Messrs. Iddings 1 and Cross 2 have contributed two interesting articles on that most attractive of all petrographical problems, the classification and naming of igneous rocks. Although attacking the subject from entirely different stand...
Holmes, A.: The origin of igneous rocks. Geol. Mag. 69 , 543–558 (1932).HOLMES A. (1932)The originof igneous rocks.Geol. Mag. 69, 543-558.HOLMES, A., 1932. The origin of igneous rocks. Geol. Mag. 69, 543-58.Holmes A (1932) The origin of igneous rocks. Geol Mag 69:543...
they will have a crystalline structure, as in granite,and if very rapidly, a glassy structure, as in obsidian. Their structure can vary anywhere between these two extremes. A common dark colored variety of this kind of rock is called basalt. There are many varieties of igneous rocks, but ...
The top contact is conformable with the bedding of the Cretaceous sandstone. Fergusite and shonkinite are the principal rocks of the headed dike. Differentiation of the two types was gravitative after intrusion. 展开 关键词: Typesandconstitute phonolite mafic phonolite Differentiation pseudoleucite ...
III.—The Igneous Rocks, etc., of the Neighbourhood of the Warwickshire Coal-field 来自 Cambridge Univ Press 喜欢 0 阅读量: 34 作者:Rutley, Frank 摘要: These rocks may be classed into five or six more or less distinct groups.I. Syenitic Rocks (Croft Series).II. Andesite and Andesitic ...
Fine-grained igneous rock is one of two major types of igneous rock. Those with fine grains are called extrusive, and those with coarse grains are intrusive. Extrusive igneous rocks form outside of the Earth's surface, while intrusive igneous rocks form beneath the Earth....
(1) THE appearance of a revised edition of Hatch and Wells's Petrology of the Igneous Rocks is a matter of interest to British petrologists, since this has long been a standard text-book in British universities. Owing to the death of Dr. Hatch, the work is now, so far as the ...