Subvolcanic rock
Encyclopedia
A subvolcanic rock, also known as a hypabyssal rock, is an igneous rock
that originates at medium to shallow depths within the crust
and contain intermediate grain size and often porphyritic texture. They have textures between volcanic
and plutonic rocks. Subvolcanic rocks include diabase
and porphyry
.
Igneous rock
Igneous rock is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava...
that originates at medium to shallow depths within the crust
Crust (geology)
In geology, the crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle...
and contain intermediate grain size and often porphyritic texture. They have textures between volcanic
Volcanic rock
Volcanic rock is a rock formed from magma erupted from a volcano. In other words, it is an igneous rock of volcanic origin...
and plutonic rocks. Subvolcanic rocks include diabase
Diabase
Diabase or dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. In North American usage, the term diabase refers to the fresh rock, whilst elsewhere the term dolerite is used for the fresh rock and diabase refers to altered material...
and porphyry
Porphyry (geology)
Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass. The larger crystals are called phenocrysts...
.