Class notes
Igneous structures
- Course
- Institution
- Book
Lecture notes on the igneous structures
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Properties of magma
-
Theory of uniformitarianism and catastrophism
Seller
Follow
vipingovind
Content preview
Earth and Environment EASC 111Igneous structures
An igneous rock is formed from magma, molten material deep inside the Earth.
Rocks are formed when this magma cools and solidifies. They may be composed of
different minerals depending on the temperature and pressure at which they were
formed. Extrusive igneous rocks are those that form when magma reaches the Earth's
surface. Intrusive igneous rocks are those that form when magma solidifies beneath
the surface of the Earth. We understand about intrusive igneous activity from the
study of old, and now solidified, magma bodies exposed by the erosion. The
intrusive or extrusive igneous rock bodies can occur in a variety of forms.
Concurrent Body
A concave surface is where two surfaces meet at right angles. A concave surface is
formed when two planes intersect at a right angle. This type of body forms when
magma rises from below the earth's crust and erupts onto the surface.
, Discordant Body
Discordant bodies form when magma erupts from beneath the surface and then cools
into solid rock. They are usually seen as large masses of hard rock that protrude
above the surrounding terrain.
Volcanic Plume
Volcanic plumes are hot gases that rise from volcanoes. They can be seen rising from
the ground and reaching great heights before dissipating.
Fissure Vent
Fissures venting lava rock is a common occurrence in volcanic areas. The lava flows
down the fissures and covers the landscape.
Batholith
Batholith is the most massive intrusive of all igneous bodies (means depth, stone).
They appear as massive linear structures hundreds of kilometres long and up to 100
kilometres wide. Batholiths are plutonic igneous rock masses that form the core of
mountains, such as the Ladakh batholith and the Mt Abu batholith. Batholiths are
always composed of granitic (felsic) and intermediate rock types, and they are
commonly referred to as granite batholiths. They form at a depth below the Earth's
surface and are only revealed after the overlying cover of the rock masses is
removed. They have no discernible floor but steep walls. They are typically
composed of quartz, feldspar, plagioclase, pyroxene, amphibole, biotite, magnetite,
ilmenite, titanite, and zircon. Batholiths are formed from the accumulation of lava
flows that solidify into massive blocks. This causes the batholith to rise above sea
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller vipingovind. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75619 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now