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Sills are fed by dikes, [3] except in unusual locations where they form in nearly vertical beds attached directly to a magma source. The rocks must be brittle and fracture to create the planes along which the magma intrudes the parent rock bodies, whether this occurs along preexisting planes between sedimentary or volcanic beds or weakened planes related to foliation in metamorphic rock.
A sill of monzonite intrudes Cambrian carbonate bedrock, near Notch Peak, Utah. A sheet intrusion, or tabular intrusion, is a planar sheet of roughly the same thickness, that forms inside a pre-existing rock. [1] When it cuts into another unlayered mass, or across layers, it is called a dike.
Sill (geostatistics) Sill (river), a river in Austria; Sill plate, a construction element Window sill, a more specific construction element than above; Automotive sill, also known as a rocker panel; see Glossary of automotive design#R; Fort Sill, a United States Army post near Lawton, Oklahoma; Mount Sill, a California mountain
Intrusive contacts are the surfaces between host (or country) rock and an intrusive magmatic body. [3] The older country rock is crosscut by a younger magmatic body. The nature of the intruding body depends on its composition and depth. Common examples are igneous dikes, sills, plutons, and batholiths. Depending on the composition of the magma ...
A rock fragment which becomes enveloped in a larger rock during the latter's development and hardening. In geology, the term is almost exclusively used to describe inclusions in igneous rock during magma emplacement and eruption. xenotime A rare earth phosphate mineral whose major component is yttrium orthophosphate (YPO 4). X-ray diffraction (XRD)
A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies.
When describing a pluton or dike, the igneous rock can be described as intruding the surrounding country rock, the rock into which the pluton has intruded. [3]When country rock is intruded by a dike, perpendicular to the bedding plane, it is called discordant intrusion, while a parallel intrusion by a sill indicates a sub-parallel or concordant intrusion.
Solidified lava flow in Hawaii Sedimentary layers in Badlands National Park, South Dakota Metamorphic rock, Nunavut, Canada. Geology (from Ancient Greek γῆ (gê) 'earth' and λoγία () 'study of, discourse') [1] [2] is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. [3]