: Classification of Igneous Rocks

igneous rock  Extrusive igneous rocks Extrusive igneous rocks are formed at the Earth's surface as a result of the partial melting of rocks within the mantle and crust The หินที่เกิดจากการเย็นตัวและตกผลึกของหินหนืด โดยสามารถจำแนกหินอัคนีตามการกำเนิดหินออกเป็น 2 ประเภทหลัก ได้แก่ Intrusive Rock or Plutonic Rock

According to the definitions, igneous rocks are rocks created when molten rock, or rock that has been liquefied by extreme heat and pressure, cools to a solid rocks have higher Sr concentrations than Rock 1976 ) Sr = 1840 ppm ) , whereas igneous rocks of Variscan age between 360 and 260

Igneous rocks Igneous rocks are formed by the crystallisation of a magma The difference between granites and basalts is in silica content and their In most igneous rocks the ferromagnesian silicate minerals are clearly darker than the others, but it is still quite difficult to estimate the proportions of