Mafic Rocks Granite

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.

Mafic rocks granite.

Are lighter in color than mafic rocks. 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. Coarse grained granite is most similar in mineral composition to fine grained. Strictly speaking granite is an.

Mafic rock is commonly contrasted with felsic rock in which. Granite is the name given to intrusive felsic rocks whereas rhyolite is the name given to extrusive felsic rocks. Chemical analyses of the most abundant components in rocks usually are presented as oxides of the elements. Mafic rocks are produced in a variety of plate tectonic settings.

The most common felsic rock is granite which represents the purified end product of the earth s internal differentiation process. As compared to coarse grained igneous rocks fine grained igneous rocks. Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Therefore rocks are divided into ultramafic mafic intermediate and felsic.

Felsic and mafic rocks division of igneous rocks on the basis of their silica content. Mafic rock in geology igneous rock that is dominated by the silicates pyroxene amphibole olivine and mica. 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.

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. 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. If magma or lava cools quickly the resulting igneous rock will have.

This is an order showing increased silica content. 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. Due to the color of the minerals forming them the rocks are either light or dark. These minerals are high in magnesium and ferric oxides and their presence gives mafic rock its characteristic dark colour.