A
ring dike or
ring dyke in
geologyGeology is the science and study of the solid and liquid matter that constitutes the Earth. The field of geology encompasses the study of the composition, structure, physical properties, dynamics, and history of Earth materials, and the processes by which they are formed, moved, and changed...
refers to an intrusive igneous body. Their chemistry,
petrologyPetrology is the branch of geology that studies rocks, and the conditions in which rocks form...
and field appearance precisely match those of
dikesA dike or dyke in geology is a type of sheet intrusion referring to any geologic body that cuts discordantly across* planar wall rock structures, such as bedding or foliation...
or
sillIn geology, a sill is a tabular pluton that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock. The term sill is synonymous with concordant intrusive sheet...
, but their concentric or radial geometric distribution around a centre of volcanic activity indicates their sub-volcanic origins.
Discussion
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A
ring dike or
ring dyke in
geologyGeology is the science and study of the solid and liquid matter that constitutes the Earth. The field of geology encompasses the study of the composition, structure, physical properties, dynamics, and history of Earth materials, and the processes by which they are formed, moved, and changed...
refers to an intrusive igneous body. Their chemistry,
petrologyPetrology is the branch of geology that studies rocks, and the conditions in which rocks form...
and field appearance precisely match those of
dikesA dike or dyke in geology is a type of sheet intrusion referring to any geologic body that cuts discordantly across* planar wall rock structures, such as bedding or foliation...
or
sillIn geology, a sill is a tabular pluton that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock. The term sill is synonymous with concordant intrusive sheet...
, but their concentric or radial geometric distribution around a centre of volcanic activity indicates their sub-volcanic origins.
Notable examples
One of the best exposed and studied ring dikes is the Loch Bà ring dike,
Isle of MullThe Isle of Mull or simply Mull is the second largest island of the Inner Hebrides, off the west coast of Scotland in the council area of Argyll and Bute....
,
ScotlandScotland is a country that is part of the United Kingdom. Occupying the northern third of the island of Great Britain, it shares a border with England to the south and is bounded by the North Sea to the east, the Atlantic Ocean to the north and west, and the North Channel and Irish Sea to the...
.
One notable ring dike in
New HampshireNew Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It borders Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian province of...
has been mistaken for a
meteorMETEOR is a metric for the evaluation of machine translation output. The metric is based on the harmonic mean of unigram precision and recall, with recall weighted higher than precision...
impact craterIn the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...
(see
Pawtuckaway State ParkPawtuckaway State Park is a preserve in New Hampshire, United States. It is one of the largest state parks in southeastern New Hampshire
).
See also
- Batholith
A batholith is a large emplacement of igneous intrusive rock that forms from cooled magma deep in the earth's crust...
- Fissure vent
A fissure vent, also known as a volcanic fissure or simply fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is usually a few meters wide and may be many kilometers long. Fissure vents can cause large flood basalts and lava channels...
- Laccolith
A laccolith is an igneous intrusion that has been injected between two layers of sedimentary rock. The pressure of the magma is high enough that the overlying strata are forced upward, giving the laccolith a dome or mushroom-like form with a generally planar base.Laccoliths tend to form at...
- Runamo
Runamo is a cracked dolerite dike that was for centuries held to be a runic inscription and gave rise to a famous scholarly controversy in the 19th century. It is located 2.7 km from the church of Bräkne-Hoby in Blekinge, Sweden...
, formerly interpreted as a runic inscription.