What is IUGS classification?

In order to create a sustainable classification of igneous rocks which all geologists might use, an international body was set up by the IUGS: the IUGS Subcommission on the Systematics of Igneous Rocks. The nomenclature for these classifications necessitates only 297 rock names out of the. 1500 that exist.

Why does the QAPF diagram present problems for P rich rocks?

Why does the phaneritic QAPF diagram present problems for P-rich rocks? Gabbro, diorite, and anorthosite all contain much more plagioclase than quartz or alkali feldspar and thus all three plot near P and cannot be distinguished on the basis of QAPF ratios alone.

How do you plot a QAPF diagram?

Using QAPF diagram Each component is represented by the corners of the equilateral triangle, the length of whose sides are divided into 100 equal parts. Any composition plotting at a corner, therefore, has a mode of 100 percent of the corresponding component.

What does QAPF stand for?

The acronym QAPF stands for “Quartz, Alkali feldspar, Plagioclase, Feldspathoid (Foid)”. These are the mineral groups used for classification in QAPF diagram. Q, A, P and F percentages are normalized (recalculated so that their sum is 100%).

What is the difference between granite and granitoid?

A granitoid is a generic term for a diverse category of coarse-grained igneous rocks that consist predominantly of quartz, plagioclase, and alkali feldspar. The terms granite and granitic rock are often used interchangeably for granitoids; however, granite is just one particular type of granitoid.

What are the 2 basic classifications of igneous rocks?

The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

Is granite a potassium feldspar?

Granite is a light-colored plutonic rock found throughout the continental crust, most commonly in mountainous areas. It consists of coarse grains of quartz (10-50%), potassium feldspar, and sodium feldspar. These minerals make up more than 80% of the rock.

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Why is SIAL called granitoid?

A granitoid or granitic rock is a variety of coarse grained plutonic rock — granite or similar — which mineralogically is composed predominantly of feldspar and quartz mica . These A-type granitoids may have been produced by hotspots or mantle plumes.

How is granite cooled?

Where do granite and granodiorite form? Granite and granodiorite are intrusive igneous rocks that slowly cool deep underground in magma chambers called plutons. This slow cooling process allows easily visible crystals to form. Both rocks are the product of the melting of continental rocks near subduction zones.

What can a QAPF diagram be used for?

QAPF diagrams are mostly used to classify plutonic rocks ( phaneritic rocks), but are also used to classify volcanic rocks if modal mineralogical compositions have been determined.

What does QAPF stand for in mineral classification?

The acronym, QAPF, stands for “Quartz, Alkali feldspar, Plagioclase, Feldspathoid (Foid)”. These are the mineral groups used for classification in QAPF diagram. Q, A, P and F percentages are normalized (recalculated so that their sum is 100%).

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How to read the QAPF diagram for sandatlas?

How to read this diagram. There are four minerals or mineral groups chosen as important cornerstones of the classification. These are quartz (Q), alkali feldspars (A), plagioclase feldspars (P), and feldspathoids (F). F and Q for chemical reasons can not exist together in one plutonic rock.