Igneous Rocks and Volcanic Landforms
- Stock. Stocks are small igneous intrusions with less than 40 square miles exposed at the Earth's surface. ...
- Dike. The color contrast between the red sedimentary rocks and the dark igneous rocks highlight this famous dike above Hance Rapid in Grand Canyon National Park.
- Laccolith. ...
- Batholith. ...
Full Answer
What is stockwork in geology?
In geology, a stockwork is a complex system of structurally controlled or randomly oriented veins. Stockworks are common in many ore deposit types and in greisens. They are also referred to as stringer zones . ^ "Stockwork definition". Merriam-Webster.
What is the difference between a stock and a dike?
Originally Answered: what is the difference between a stock and a dike ? A dyke is a tabular vertical body that was subvertical at the time of emplacement. In addition to their magmaticsignificance, dykes can also act as barriers to Ground-water flow and may localize hydrothermal fluids along their margins.
What can I find in the geology store?
General Geology: Articles about geysers, maars, deltas, rifts, salt domes, water, and much more! Geology Store: Hammers, field bags, hand lenses, maps, books, hardness picks, gold pans. Earth Science Records: Highest mountain, deepest lake, biggest tsunami and more.
What is the difference between a stock and a batholith?
Stocks are composite bodies that have probably been fed by deeper level batholiths and may have been feeders for volcanic eruptions. However, because considerable erosion is necessary to expose a stock or batholith, the associated volcanic rocks rarely remain.
What is a stock in a volcano?
A stock is a remnant of the vent of a volcano or plutonic body with an areal extent less than 40 square miles (or 100 square kilometers). Far below the surface, a large magma chamber will slowly cool to form small plutons and large batholiths.
What is the difference between a batholith and a stock?
Large irregular-shaped plutons are called either stocks or batholiths. The distinction between the two is made on the basis of the area that is exposed at the surface: if the body has an exposed surface area greater than 100 km2, then it's a batholith; smaller than 100 km2 and it's a stock.
Is a stock a pluton?
shaped plutons are called either stocks or batholiths (see Figure 6), depending on their sizes. Plutons larger than 100 square kilometres in area are termed batholiths, while those of lesser size are called stocks.
What is a boss in geology?
Geology. a knoblike mass of rock, especially an outcrop of igneous or metamorphic rock.
Is stock intrusive or extrusive?
Stocks are small igneous intrusions with less than 40 square miles exposed at the Earth's surface.
What is an example of a stock?
Stock means a share in the ownership of a company. An example of stock is 100 shares of Disney Corporation.
Is stock an intrusive igneous body?
A body of intrusive igneous rock which crystallizes from magma cooling underneath the surface of the Earth is called a pluton. If the pluton is large, it may be called a batholith or a stock depending on the area exposed at the surface.
Is stock tabular or massive?
A stock is a small discordant pluton whereas a batholith is a pluton of more than 100 sq. km in outcrop area. A dike is a tabular body of igneous rock cutting across bedding and hence, discordant. A sill is a tabular body which is concordant.
What are plutons in geography?
A pluton (pronounced "PLOO-tonn") is a deep-seated intrusion of igneous rock, a body that made its way into pre-existing rocks in a melted form (magma) several kilometers underground in the Earth's crust and then solidified.
What is a Xenocryst in geology?
A xenocryst is an individual foreign crystal included within an igneous body. Examples of xenocrysts are quartz crystals in a silica-deficient lava and diamonds within kimberlite diatremes.
What is a laccolith in geology?
laccolith, in geology, 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.
Whats the difference between a dike and a sill?
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.
Where is Ship Rock?
A classic example is Ship Rock, a volcanic neck on the Navajo Reservation that rises nearly 1,600 feet above the desert near Farmington, New Mexico. Although the use of "volcanic" in the name suggests that volcanic necks are extrusive features, they are comprised of intrusive igneous rocks.
What is the name of the rock that is formed by lava flow?
Geologists also use the term lava flow to describe the rock that eventually solidifies from the flowing, molten lava. Basalt is an example of an extrusive igneous rock formed from dark-colored lava. Rhyolite is an example of an extrusive igneous rock formed from light-colored lava.
What is a volcanic pipe?
Volcanic Pipe. A volcanic pipe is a vertical conduit beneath a volcano through which magma once passed on its journey from the magma chamber to the eruption site. Over time, volcanic pipes usually become clogged by solidified magma and other volcanic rocks, leaving a hard, cylindrical-shaped formation behind.
What are the features of a volcano?
As the name suggests, these features tend to be conical in shape and can be light- or dark-colored.
What is the name of the rock that is located in the main feeder pipe of a volcano?
Volcanic Neck. Named for its resemblance to the silhouette of a sailing ship, Ship Rock is a volcanic neck located where the main feeder pipe for a larger volcano was once located. The wall-like rock feature radiating outward from the volcanic neck is a dike (see below). Image copyright iStockphoto / Emre Corbaci.
What is the name of the crack in the Earth's surface from which lava pours out?
Fissure. A long crack on the Earth's surface from which lava pours out is called a fissure. This type of volcanic activity is called a 'fissure eruption'. It most commonly occurs in places where dark magmas with low silica contents erupt, such as the Holuhraun lava fields of Iceland and Kilauea Volcano of Hawaii.
How do sills form?
Sills can form from magmas with a range of silica contents. These features can vary from less than one inch up to hundreds of feet thick and can extend for many miles.
What is a stockwork in geology?
In geology, a stockwork is a complex system of structurally controlled or randomly oriented veins. Stockworks are common in many ore deposit types and in greisens. They are also referred to as stringer zones .
What is a stockwork?
Stockwork. In geology, a stockwork is a complex system of structurally controlled or randomly oriented veins. Stockworks are common in many ore deposit types and in greisens. They are also referred to as stringer zones .
