What type of mineral composition is diorite?
|Color||Approximately half dark, half white minerals|
|Mineral Composition||Sodium – Calcium Plagioclase, Quartz, Hornblende, Biotite|
|Miscellaneous||Salt and Pepper Appearance|
What is the mineral composition of diorite 5 minerals?
Diorite (/ˈdaɪ. əˌraɪt/ DY-ə-ryte) is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene.
What metamorphic rock is formed from diorite?
Diorite – Medium-grained hornblende diorite metamorphosed in part to amphibolite and hornblende gneiss.
Does diorite have a felsic composition?
Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is …
Which igneous rock has the most similar composition to diorite?
Diorite and andesite are similar rocks. They have the same mineral composition and occur in the same geographic areas.
What is andesitic composition?
Andesite most commonly denotes fine-grained, usually porphyritic rocks; in composition these correspond roughly to the intrusive igneous rock diorite and consist essentially of andesine (a plagioclase feldspar) and one or more ferromagnesian minerals, such as pyroxene or biotite.
How is diorite rock formed?
Diorite is a course-grained igneous rock that forms when magma rich in silica cools slowly deep within the Earth’s crust.
Is diorite a metamorphic?
It is a metamorphosed gabbro (metagabbro or more specifically hornblende-scapolite rock). The original pyroxene-plagioclase assemblage has been hydrothermally altered to hornblende-scapolite assemblage.
What processes form diorite?
What do granite and diorite have in common?
Granite and diorite do have some things in common, however. They are both types of hard, igneous rock, and is each known for its durability.
What is the common environment of formation of diorite?
Formation of Diorite Partial melting of the oceanic plate produces a basaltic magma that rises and intrudes the granitic rock of the continental plate. There, the basaltic magma mixes with granitic magmas or melts granitic rock as it ascends through the continental plate.
What is the difference between diorite and andesite?
The differences are in their grain sizes and their rates of cooling. Diorite crystallized slowly within the Earth. That slow cooling produced a coarse grain size. Andesite forms when a similar magma crystallizes quickly at Earth’s surface.
What kind of rock is a diorite made of?
Diorite will typically fall in-between this range with a concentration of 70-50% albite with a 30-50% of anorthite, which is known as andesine in the plagioclase group of minerals. What type of rock is diorite? Answer: Intrusive igneous rock
What kind of rock is the wehrlite made of?
Clinopyroxenite is composed of equigranular diopside with <10% hornblende and up to 50% disseminated, massive, and euhedral magnetite, often forming layers. In some outcrops west of the wehrlite unit, clinopyroxenite becomes richer in olivine and the rock grades into hornblende clinopyroxenite.
What is the diopside content of a wehrlite?
The homogeneous wehrlite consists of >10 vol.% diopside, with large olivine crystals evenly distributed in a matrix of finer grained olivine. The graded wehrlite member has a higher content of coarse-grained diopside with respect to the finer grained crystals.
What kind of plagioclase is in a diorite?
DIORITE – Intrusive igneous, plutonic. A phaneritic igneous rock composed of essential sodic plagioclase (oligoclase or andesine) and a mafic, usually hornblende, or more rarely, biotite or pyroxene. In the IUGS classification diorite contains 0 – 5 Q, P/(A + P) >90, and the plagioclase composition < An50.