0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Where do we find mafic rocks?
Pertaining to rocks rich in dark, ferromagnesian minerals.
Why are mafic rocks denser than felsic rocks?
Mafic rocks are denser than felsic rocks because they contain heavier compounds, minerals and other materials, they are ferromagnesian in composition.
Mafic minerals are often found near the bottom of a pluton and felsic minerals near the top what process is this because of?
The process is painful love. When the mafic minerals fall in love with the felsic minerals they fall to the bottom. The felsic is often there too and sees the minerals falling toward them so they scared to be in love again and go to the top. This makes the mafic mad and it stays there. The felsic is afraid to go back and stays on the top. :( <333 love hurts If I remember my geology, plutons are considered intrusions, and reflect the mineral composition of the magma they were formed from. That being said, what minerals are present in a pluton are directly a result of what they were made from, and the minerals condense out following Bowen's Reaction series. This means mafic minerals condense out at a higher temp and higher pressure, so as the pluton continues to intrude, it cools and depressurizes. Thus minerals lower in the reaction series cool and crystallize before the felsic minerals towards the top. You can also find contact metamorphic rocks on the edges of plutons. Some of these may wrongfully appear to be mafic rocks like Olivine. http://en.wikipedia.org/wiki/Bowen's_reaction_series
Basaltic magma forms what kind of igneous rock?
Mafic igneous rock. ( due to Ferromagnesian minerals).
Which minerals are not present in felsic type igneous rocks but are present in mafic type igneous rocks?
Minerals which contain much magnesium and iron, like olivine and pyroxene.
What are mafic rocks?
A mafic rock is composed of mafic minerals such as biotite mica, amphibole, proxene, and olivine. The actual word mafic refers to magnesium and iron; nevertheless, these minerals are called ferromagnesian. Mafic rocks include gabbro, scoria, and basalt. They each have about 46-85% mafic mineral crystals. Periodite, 86-100% mafic minerals, is considered ultramafic because of its olivine composition.
What is alaskite?
A plutonic rock consisting of oligioclase, microcline and quartz with subordinate muscovite and little or no mafic minerals. An alkali granite with no mafic minerals
What minerals are found in mafic rocks?
mafic rocks can be made up of orthoclase feldspar and quartz
Why are mafic minerals dark in color?
No. Felsic rocks are light-colored and high in silica. Mafic rocks are generally dark-colored and low in silica.
What is the comaprison of felsic and mafic?
Felsic minerals are Silicon-rich; whereas Mafic ones are low in Silicon, but contain Iron and Magnesium.
What is the mantle rich in?
Mafic and ultramafic minerals, high in magnesium and iron.
Is sandstone felsic or mafic?
Neither. The terms mafic and felsic refer to the composition of igneous rocks, which are dominated by silicate minerals. Marble is a metamorphic rock composed of carbonate minerals. The terms mafic and felsic do no apply to it.
What rock contains high density minerals such as olivine?
Mafic, igneous rocks
Where do we find mafic rocks?
Pertaining to rocks rich in dark, ferromagnesian minerals.
What type of rock contains high-density minerals such as olivine?
Mafic, igneous rocks
Why is the main reason that oceanic crust is heavier than continental crust?
Oceanic crust is mafic in composition and continental crust is felsic in composition. Mafic minerals generally have a higher density than felsic minerals and therefore, the oceanic crust is heavier.
What would be one of the first minerals to crystallize from liquid rock in a mafic igneous sill?
Olivine
