Classification of gabbro
What is the classification of granite?
Mineralogical classification of granites includes four rock types: tonalites, granodiorites, granite (monzogranite and syenogranites) and alkali-feldspar granites. Alphabetical classification subdivided granites into: I-type, S-type, A-type and M-type granites.
Is gabbro igneous sedimentary or metamorphic?
Gabbro (olivine gabbro)
Gabbro is a basic igneous rock, the intrusive equivalent of basalt.
Is gabbro a sedimentary rock?
No, gabbro is not a sedimentary rock. It is an igneous rock. It was formed from the cooling of magma after it intruded into the overlying rock.
What type of rock is a gabbro how is it formed?
Gabbros are intrusive igneous rocks that cool slowly and have coarse-grained crystals. Divergent boundary: In the oceanic crust, basalt forms near the surface at a divergent boundary, but gabbro forms at depth from slow crystallization.
What type of rock is gabbro?
Mafic Intrusive Igneous Rocks
1 Mafic Intrusive Igneous Rocks. Gabbro is a mafic intrusive coarse-grained rock with allotriomorphic texture. Gabbros contain low silicon (no Quartz or Alkali feldspar) and essentially of ferromagnesian minerals and Plagioclase feldspar rich in calcium.
How do you identify gabbro?
What is gabbro made up of?
gabbro, any of several medium- or coarse-grained rocks that consist primarily of plagioclase feldspar and pyroxene. Essentially, gabbro is the intrusive (plutonic) equivalent of basalt, but whereas basalt is often remarkably homogeneous in mineralogy and composition, gabbros are exceedingly variable.
What is the texture of gabbro rock?
Gabbro
| Rock group | Igneous |
|---|---|
| Classification | Intrusive/plutonic |
| Composition | Mafic |
| Texture | Phaneritic |
| Extrusive counterpart | Basalt |
What is the physical properties of gabbro?
Below Core 209-1275B-6R, the properties of the gabbros are less variable. Bulk densities are generally in the range 3.1–3.2 Mg/m3, porosities are commonly 1.5%–2.5%, velocities are mostly 4.7–5.4 km/s (mean = 5.2 km/s), and the apparent seismic anisotropy is generally <2.5% (mean = ~2%).
What type of rock is gabbro igneous sedimentary metamorphic submit?
igneous rock
Gabbro is formed when magnesium and iron-rich magma cools slowly underground, so it is an igneous rock.
Where is gabbro found?
Gabbros are commonly found underground in the vicinity of volcanoes, as well as in oceanic crust near mid-ocean ridge spreading centers. It contains a variety of dark colored minerals that are classified by geologists as being mafic. These minerals include pyroxene, plagioclase, amphibole, and olivine.
What is the difference between gabbro and diorite?
The difference between gabbro and diorite lies in the composition of plagioclase, sodic in diorites (An5–50; oligoclase – andesine), calcic in gabbros (An50–100; labradorite – bytownite – anorthite). In the field, a light-colored gabbroid rock is more likely to be a diorite, rather than a gabbro.
What is the difference between gabbro and granite?
Granite is a coarse-grained igneous rock with average grain size ranging from 1 to 25 millimeters. Gabbro is generally coarse grained, with crystals in the size range of 1 mm or greater.
What is the definition of gabbro?
Definition of gabbro
: a granular igneous rock composed essentially of calcic plagioclase, a ferromagnesian mineral, and accessory minerals.
What is the physical properties of gabbro?
Below Core 209-1275B-6R, the properties of the gabbros are less variable. Bulk densities are generally in the range 3.1–3.2 Mg/m3, porosities are commonly 1.5%–2.5%, velocities are mostly 4.7–5.4 km/s (mean = 5.2 km/s), and the apparent seismic anisotropy is generally <2.5% (mean = ~2%).
What is gabbro made up of?
gabbro, any of several medium- or coarse-grained rocks that consist primarily of plagioclase feldspar and pyroxene. Essentially, gabbro is the intrusive (plutonic) equivalent of basalt, but whereas basalt is often remarkably homogeneous in mineralogy and composition, gabbros are exceedingly variable.
What is the texture of gabbro rock?
Gabbro
| Type | Igneous Rock |
|---|---|
| Texture | Phaneritic (Coarse-grained) |
| Origin | Intrusive/Plutonic |
| Chemical Composition | Mafic |
| Color | Dark Gray |
What is the density of gabbro?
Densities of Igneous Rocks
| Rock Type | Density Range (g/cm ) |
|---|---|
| Granite | 2.50 – 2.81 |
| Andesite | 2.40 – 2.80 |
| Basalt | 2.70 – 3.30 |
| Gabbro | 2.70 – 3.50 |