What is the Protolith of amphibolite?Geology
Amphibolite is a metamorphosed mafic igneous rock (basalt, gabbro) although it is usually difficult to determine the protolith because original features are often obliterated. Basalt is composed of pyroxene + plagioclase.
What is the parent rock of amphibolite?
|Metamorphic Grade||Middle Grade (Middle P – Middle T)|
|Parent Rock||Basalt; Mafic igneous rocks|
|Metamorphic Environment||Middle grade regional metamorphism along a convergent plate boundary|
How is amphibolite created?
How Does Amphibolite Form? Amphibolite is a rock of convergent plate boundaries where heat and pressure cause regional metamorphism. It can be produced through the metamorphism of mafic igneous rocks such as basalt and gabbro, or from the metamorphism of clay-rich sedimentary rocks such as marl or graywacke.
What is amphibolite made of?
The mineral composition of the amphibolites is simple and mostly contains hornblende and plagioclase, with variable amounts of anthophyllite, garnet, mica, quartz, and epidote. The rocks may originate from pelitic sediments, with amphibole (hornblende), plagioclase, and typically include green pyroxene.
Is basalt a parent rock of amphibolite?
Mafic igneous rocks (e.g., basalts and gabbros) and sedimentary dolomite can be the parent rocks of amphibolite.
How are amphibolite facies formed?
amphibolite facies, one of the major divisions of the mineral-facies classification of metamorphic rocks, the rocks of which formed under conditions of moderate to high temperatures (500° C, or about 950° F, maximum) and pressures.
What type of protolith would yield a amphibolite what minerals are in the protolith and which ones form in the amphibolite?
Amphibolite is a non foliated metamorphic rock that is mainly composed of mineral amphibole and plagioclase feldspar with little or no quartz.
What is protolith marble?
Limestone is a protolith for marble.
What is marble’s parent rock?
Parent Rock. Limestone or Dolostone. Metamorphic Environment. Variable grade regional or contact metamorphism along a convergent plate boundary.
Is amphibolite metamorphic?
Amphibolite is a coarse-grained metamorphic rock, predominantly composed of mineral amphibole and plagioclase feldspar. It can also contain minor amounts of other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite, and sillimanite.
Which is a protolith of quartzite?
quartzite—quartzite is a metamorphic rock made almost entirely of quartz, for which the protolith was quartz arenite. Because quartz is stable over a wide range of pressure and temperature, little or no new minerals form in quartzite during metamorphism.
Is amphibolite felsic or mafic?
The name amphibolite has been used in geological literature for nearly 200 years, since Brongniart (1813).
Is amphibolite a Porphyroblastic?
Amphibolites have massive structure and porphyroblastic texture due to plagioclase (18-14e2) and garnet grains (18-4a). Sample 18-14e2 is an epidote amphibolite with primary amphibole + epidote + plagioclase (magmatic fragments) assemblage.
Is amphibolite a gneiss?
Melanocratic, fine- to coarse-grained, weakly to strongly foliated, irregularly layered amphibole-rich gneiss and schist.
Amphibolite, Amphibole Gneiss, and Schist.
|Name||Amphibolite, Amphibole Gneiss, and Schist|
|Geologic age||Proterozoic Y|
How do you identify amphibolite?
Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase, with little or no quartz. It is typically dark-colored and dense, with a weakly foliated or schistose (flaky) structure. The small flakes of black and white in the rock often give it a salt-and-pepper appearance.
Where can you find amphibolite?
Amphiboles are found principally in metamorphic and igneous rocks. They occur in many metamorphic rocks, especially those derived from mafic igneous rocks (those containing dark-coloured ferromagnesian minerals) and siliceous dolomites.
Why can basalt or gabbro be the protolith for amphibolite?
Basalt is composed of pyroxene + plagioclase. In order to make amphibolite out of basalt, we need heat and pressure to initiate chemical reactions and also need to add water because amphiboles, unlike pyroxenes, are hydrous minerals.
What is the parent rock of quartzite?
|Metamorphic Type||Regional or Contact|
|Parent Rock||Quartz Sandstone|
|Metamorphic Environment||Variable grade regional or contact metamorphism along a convergent plate boundary|
Is amphibolite mafic?
Amphibolite is a gneissose or granofelsic metamorphic rock mainly consisting of green, brown or black amphibole and plagioclase (including albite), which combined form ≥75% of the rock and both of which are present as major constituents; the amphibole constitutes ≥50% of the total mafic constituents and is present in …
What kind of rock can be a protolith?
Protoliths are usually granites, rhyolites, or arkose sandstones and metamorphism results in gneisses containing an abundance of quartz, feldspar, and biotite.
What is the density of amphibolite?
Densities of Metamorphic Rocks
|Material||Density Range (g/cm )|
|Gneiss||2.59 – 3.00|
|Granulite||2.52 – 2.73|
|Amphibolite||2.90 – 3.04|
|Eclogite||3.20 – 3.54|
What is the streak of amphibolite?
Physical Properties of Glaucophane
Color. Grey to lavender-blue. Streak. Pale grey to bluish-grey. Luster.
What is the protolith of Migmatite?
Other migmatite hypotheses
Such granites derived from sedimentary rock protoliths would be termed S-type granite, are typically potassic, sometimes containing leucite, and would be termed adamellite, granite and syenite.
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