Mafic Rocks Granite

The most common felsic rock is granite which represents the purified end product of the earth s internal differentiation process.

Mafic rocks granite.

Cool and solidify more quickly. Felsic rocks are produced primarily in convergent plate boundaries in which an oceanic plate is subducting beneath either another oceanic plate such as in japan. The bushveld complex in south africa is earth s largest mafic layered intrusion and comprises mafic cumulate rocks of the rustenburg layered suite rls which are overlain by felsic rocks of the rashoop granophyre and the lebowa granite suites the bc was intruded at 2 055 ga at shallow crustal level 200 mpa mostly into sediments of the transvaal supergroup pitra and de waal 2001. Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.

Granodiorite ˌ ɡ r æ n oʊ ˈ d aɪ ə r aɪ t n ə is a phaneritic textured intrusive igneous rock similar to granite but containing more plagioclase feldspar than orthoclase feldspar according to the qapf diagram granodiorite has a greater than 20 quartz by volume and between 65 to 90 of the feldspar is plagioclase. Mafic rocks including the volcanic rocks and dolerites from this study crop out in the cenxi and wuzhou areas at the ne end of the dsgc belt fig. A greater amount of plagioclase would designate the rock as. 1a d they provide an opportunity to explore the interaction between crust and mantle and to refine the tectonic setting of uht metamorphism and high temperature magmatism in the dsgc belt.

Mafic rocks have between 45 and 55 of silica whereas felsic rocks have over 65 of silica the highest of all types. It is important to note that there are many intermediate steps in the purification process and many intermediate magmas which are produced during the conversion from mafic to felsic. If magma or lava cools quickly the resulting igneous rock will have. These minerals are high in magnesium and ferric oxides and their presence gives mafic rock its characteristic dark colour.

As compared to coarse grained igneous rocks fine grained igneous rocks. Chemical analyses of the most abundant components in rocks usually are presented as oxides of the elements. Igneous rocks typically consist of approximately 12 major oxides totaling over 99 percent of the rock of the oxides silica sio 2 is usually the most abundant. Therefore rocks are divided into ultramafic mafic intermediate and felsic.

Coarse grained granite is most similar in mineral composition to fine grained. Felsic and mafic rocks division of igneous rocks on the basis of their silica content. Are lighter in color than mafic rocks. Strictly speaking granite is an.

This is an order showing increased silica content. Due to the color of the minerals forming them the rocks are either light or dark. Granites can be predominantly white pink or gray in color depending on their mineralogy the word granite comes from the latin granum a grain in reference to the coarse grained structure of such a completely crystalline rock. Mafic rock is commonly contrasted with felsic rock in which.