A sill is a concordant intrusive sheet, meaning that a sill does not cut across preexisting rock beds. Stacking of sills builds a sill complex and a large magma chamber at high magma flux. In contrast, a dike is a discordant intrusive sheet , which does cut across older rocks.
What is the difference between a sill and a dike What is the difference between a batholith and a stock?
A sill is concordant with existing layering, and a dike is discordant . If the country rock has no bedding or foliation, then any tabular body within it is a dike. Note that the sill-versus-dike designation is not determined simply by the orientation of the feature.
What is the main difference between a dike and a sill quizlet?
What is the difference between a dike and a sill? Dikes are formed across vertical cracks , and sills are formed across horizontal ones.
Why are the dikes and sills so easily distinguished?
Why are the dikes and sills so easily distinguished in Sinbad country? Basalt and the hardened, baked zones are more resistant to erosion than the sedimentary rocks. ... Sills form as magma intrudes with enough force to overcome the weight of the rocks above.
What is a dike in rock layers?
Dike, also called dyke or geological dike, in geology, tabular or sheetlike igneous body that is often oriented vertically or steeply inclined to the bedding of preexisting intruded rocks ; similar bodies oriented parallel to the bedding of the enclosing rocks are called sills.
Why are there no baked zones on the edges?
Why don’t the baked zones along the edges of the dikes and sills show evidence of metamorphism? They weren’t under enough pressure and didn’t remain hot for a long enough period of time .
How are sills and dikes similar and different?
Dykes (or dikes) are igneous rocks that intrude vertically (or across), while sills are the same type of rocks that cut horizontally (or along) in another land or rock form .
What are the 4 types of plutons?
The most common rock types in plutons are granite, granodiorite, tonalite, monzonite, and quartz diorite .
Could a pluton be formed from lava?
| Plutonic Volcanic | Granite Basalt |
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How is a sill formed?
Sills: form when magma intrudes between the rock layers , forming a horizontal or gently-dipping sheet of igneous rock.
Where are Sills found?
Sills occur in parallel to the bedding of the other rocks that enclose them , and, though they may have vertical to horizontal orientations, nearly horizontal sills are the most common. Sills may measure a fraction of an inch to hundreds of feet thick and up to hundreds of miles long.
Are a Laccolith and Volcano the same thing?
A laccolith is a sheet-like intrusion (or concordant pluton) that has been injected within or between layers of sedimentary rock (when the host rock is volcanic, the laccolith is referred to as a cryptodome).
Which kind of eruptive activity is highly explosive?
| Question Answer | Which kind of eruptive activity is most likely to be highly explosive? eruptions of big, continental margin, composite cones or stratovolcanoes | Magma tends to rise toward Earth’s surface principally because ________. rocks become less dense when they melt |
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Is a dike vertical or horizontal?
Dikes are usually high-angle to near-vertical in orientation , but subsequent tectonic deformation may rotate the sequence of strata through which the dike propagates so that the dike becomes horizontal. Near-horizontal, or conformable intrusions, along bedding planes between strata are called intrusive sills.
What does a dike look like?
Dikes are usually visible because they are at a different angle, and usually have different color and texture than the rock surrounding them. Dikes are made of igneous rock or sedimentary rock. ... A dike is, therefore, younger than the rocks surrounding it. Dikes are often vertical , or straight up and down.
What is an intrusion in rock layers?
An intrusion is a body of igneous (created under intense heat) rock that has crystallized from molten magma . Gravity influences the placement of igneous rocks because it acts on the density differences between the magma and the surrounding wall rocks (country or local rocks).
