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INTRUSIVE VUCANICITY

INTRUSIVE VUCANICITY. EXTRUSIVE VULCANICITY. Types of Volcanoes. Click on the following for further information of earth structure. Batholith Dyke Laccolith Sill. THE END. INTRUSIVE VULCANICITY. Batholith .

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INTRUSIVE VUCANICITY

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  1. INTRUSIVE VUCANICITY

  2. EXTRUSIVE VULCANICITY Types of Volcanoes Click on the following for further information of earth structure. • Batholith • Dyke • Laccolith • Sill

  3. THE END

  4. INTRUSIVE VULCANICITY Batholith a large body of igneous rock formed beneath the Earth's surface by the intrusion and solidification of magma commonly composed of coarse-grained rocks (e.g., granite or quartz diorite) with a surface exposure of 100 square km or larger irregular shape with side walls that incline steeply against the host rock usually intrude across mountain folds and are elongated along the dominant axis of the range studies have shown that many of them have thickness of perhaps 10 to 15 km BACK

  5. INTRUSIVE VULCANICITY Dyke (dike) is the tabular or sheetlike igneous body that is often oriented vertically or steeply inclined to the bedding of preexisting intruded rocks a dike set is composed of several parallel dikes; when the number of dikes is large, the term dike swarm is used. average width is between 1 and 20 feet length of a dike usually depends upon how far it can be traced across the surface dikes have a wide range of rock compositions, they commonly have a porphyritic texture. BACK

  6. INTRUSIVE VULCANICITY Laccolith is any of a type of igneous intrusion that has split apart two strata, resulting in a domelike structure; the floor of the structure is usually horizontal. often smaller than a stock, which is another type of igneous intrusion, and usually is less than 16 km in diameter the thickness of laccoliths ranges from hundreds of metres to a few thousand metres a laccolith's ratio of diameter to thickness should be less than 10; a larger ratio would make the body a sill. acidic rocksare more common than basic rocks in laccoliths BACK

  7. INTRUSIVE VULCANICITY Sill also called sheet tabular igneous intrusion emplaced parallel to the bedding of the enclosing rock may have vertical to horizontal orientations, horizontal sills are the most common. sills may be a fraction of an inch to hundreds of feet thick and up to hundreds of miles long rock compositions of all types are found in sills Go to (2) for more information BACK

  8. INTRUSIVE VULCANICITY Sill • can be subdivided on the basis of the number of intrusions that have formed them and the variability of the rock types involved: • a simple sill results from a single intrusive; • a multiple sill is formed by two or more intrusions; • a composite sill is composed of more than one rock type emplaced during more than one intrusive episode. Go to (1) for more information BACK

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