Summary
Summary notes for Lecture 7 and UE Ch 4 - Volcanism & Plutonism – 2
- Course
- Institution
- Book
Summary notes for Lecture 7 Volcanism & Plutonism – 2 - LEC 172 Geology Understanding Earth - Ch 8 notes
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
LEC172 Lecture 12 & Understanding Earth Ch 7 notes
-
Samenvatting Systeem aarde (Boek)
Seller
Follow
ciarangreer
Content preview
Monday 29th November 2021 LEC 172Volcanism & Plutonism – 2
Kettle Hoe – Depression left behind when an ice block beneath the surface has melted and caused the
overlying sediment to collapse in/sink in an isolated shape, due to the decrease in volume.
Igneous Intrusions:
= Molten igneous material (magma), with a high temp and
the ability to flow, that migrates through the crust until it
reaches its level of mutual buoyancy (where it’s a similar
density of the country (surrounding) rock) and fills in any
spaces before slowly solidifying.
Information on the shapes and volumes of intrusions
gained from field work/visual observations, geophysical
surveying (seismic/gravity/radar surveys), underground
mapping and drilling (or cores).
Pluton = 100’s Km3 in volume igneous bodies.
Batholith = Larger versions of plutons. <&^Both solidified magma chambers.
Sill = Igneous structures (concordant) parallel to the local sedimentary succession (intrusions in horizontal
strata).
Dike = Cross-cutting igneous intrusions (discordant).
Geological Sketch Map of Devon/Cornwall Batholiths:
The Cornubian granite batholith is a solidified
magma chamber, that crystallised ~300 Ma ago.
It may have fed volcanoes at the surface but if
so, the volcanic rocks have long since been
eroded.
Red – visible batholith.
Pink - Gained from geophysical methods.
Geological map of the SW Peninsula of NW Scotland – Island of
Mull:
Ross of Mull granite pluton, Isle of Mull, Scotland, UK;
crystallised 418 Ma ago
Basalt Dyke:
Basalt dyke, approx 10 m wide,
intruded into shale, Grand
Canyon National Park, Arizona,
USA
, Basalt Dyke:
Basalt dyke, approx 1 m wide, in caldera wall of Sollipulli, Chile. 2200m
Above Sea level.
Sill Example:
Near horizontal mafic sill of the Ferrar Dolerite (dark) intruded into Beacon
Sandstone (light) at the margin of Taylor Glacier, Antarctica
< Volcanic neck 515 m above surrounding flat-
lying sediments, with radiating dykes, Shiprock,
New Mexico, USA
Classification of Igneous Rocks:
Igneous rocks can be classified by determining the silica
content (weight % of SiO…), grain size
(fine/medium/coarse) or the rocks proportion of minerals.
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 ciarangreer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.68. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
76449 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now