Chemical Composition Of Granite And Basalt

It is defined in the tas diagram shown above.

Chemical composition of granite and basalt.

Tholeiites vs alkali basalts. Included in this category are most basalts of the ocean floor most large oceanic islands and continental flood basalts such as the columbia. Two mica granites are typically high in potassium and low in plagioclase and are usually s type granites or a type granites. A magma the earth gets very hot just below the surface and there is lots of liquidrock available.

Both are made up of minerals from the silicate group so both have large amounts of silicon. It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth. A granite containing both muscovite and biotite micas is called a binary or two mica granite. Basalt has a strict chemical definition.

Sio 2 49 97 tio 2 1 87 al 2 o 3 15 99 fe 2 o 3 3 85 feo 7 24 mno 0 20 mgo 6 84 cao 9 62 na 2 o 2 96 k 2 o 1 12 p 2 o 5 0 35. Average chemical composition of basalt determined by 3594 chemical analyses of basaltic rocks 2 numbers are mass percents recalculated volatile free to total 100. The chemical composition of granite is typically 70 77 silica 11 13 alumina 3 5 potassium oxide 3 5 soda 1 lime 2 3 total iron and less than 1 magnesia and titania. Learn more about the properties and uses of granite in this article.

Tholeiitic basalt is relatively rich in silica and poor in sodium. Volcanic rock of equivalent chemical composition and mineralogy is called rhyolite. Types of basalt basalt types. Basalt is mafic while granite is felsic.

Among other differences the nature of these rocks reveals that basalt is basic in nature whereas granite is acidic in nature. Basalt is an igneous rock that contains more than 45 and less than 52 of sio2 and less than five percent of total alkalies k2o na2o 3. A worldwide average of the chemical composition of granite by weight percent based on 2485 analyses. Basalt is common on both earth and other solar system bodies such as the moon and mars while granite is only common on earth and rare elsewhere in the solar system.

Basalt is volcanic or extrusive forming at the surface while granite is plutonic or intrusive forming beneath the surface. Granite coarse or medium grained intrusive igneous rock that is rich in quartz and feldspar. This composition is as follows. Of the two basalt is darker and consists of fine grained minerals such as magnesium and iron while granite is lighter and consist of feldspar and quartz.