Announcements
Download
1 / 37

Announcements - PowerPoint PPT Presentation


  • 76 Views
  • Uploaded on

Announcements. Reminder, this Saturday field trip . Meeting place/time: GS loading dock at 7:45 am. Bring hiking gear, lunches, water.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Announcements' - rachana


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Announcements

Announcements

Reminder, this Saturday field trip . Meeting place/time: GS loading dock at 7:45 am. Bring hiking gear, lunches, water.

Extra credit: get 1 point (test-equivalent; for each tectonics -related Geoscience colloquium attended between now and end of class). A list of colloquiums to attend will be posted on the web. Turn in a paragraph summarizing the main points of the talk.


Announcements

Normal faults

-rifted continental margins

-form in extension

-typical for continental and oceanic lithosphere

-jargon (horsts, grabens, listric, detachment)

-are they low-angle?

-core complexes

-Example: Basin and Range, -the way we think it works, mechanically

-

Normal fault systems(D&R: 340-357)



Announcements

It’s low angle, but so are thrust faults:

KEY: puts young (hanging wall) on old

(footwall). The fault markers (slickenlines

Etc) are the same.


Announcements

Horsts and grabens

Iin agreement with Coulombian mechanics


Announcements

Some problems with the model-

Most faults look listric and low angle

Listric



Announcements

Simple shear

A complication of simple shear



Announcements

Sedimentation takes place during faulting;

Also block rotation domino-style





Announcements

Basin and Range- world’s scale example

most studied extensional

province-low-angle normal

faulting prevails.





Announcements

Exhumation of metamorphic cores beneath detachment faults scale example

Extension of the upper crust commonly requires flow in the mid- to low crust and/or magmatic additions


Announcements

Important things about normal faults. scale example

1. Fundamental to structure of continents and oceans.


Announcements

Important things about normal faults. scale example

2. Two different styles: the low-angle and high-angle.


Announcements

Important things about normal faults. scale example

3. Can take up as much extension as compressional

orogens shorten.


Announcements

Important things about normal faults. scale example

4. You live in the most famous (and perhaps

most important extensional region-the B&R).


Announcements

Important things about normal faults. scale example

5. Extension is accompanied by big-time

sedimentation-important for oil formation.


Announcements

Important things about normal faults. scale example

1. Fundamental to structure of continents and oceans.

2. Two different styles: the low-angle and high-angle.

3. Can take up as much extension as compressional

orogens shorten.

4. You live in the most famous (and perhaps

most important extensional region in the world-the B&R).

5. Extension is accompanied by big-time

sedimentation-important for oil formation.