Chapter 4 wrapup

Today’s Lecture: Plate margins and associated geological pheneomena.. - Divergent plate margins in continental settings origin of new ocean basins.. - Transform margins ridge transforms

Extra Credit Option:

Attend the Public Lecture by Prof Antonio Lazcano on Tuesday (tomorrow) evening,

Feb 11 at 7:30 PM in Gammage Auditorium here on campus Write up a short summary 2-3 paragraphs for the talk, highlighting the aspects you found most interesting

Bring your write-up to class on Wednesday

Be sure to write your name and ASU ID at the top of the page.

Today’s Lecture:

 Plate margins and associated geological

pheneomena

- Intraplate hot-spots

- Divergent plate margins in continental settings

(origin of new ocean basins)

- Convergent margins

- Continental margin settings

- Transform margins (ridge transforms and

on-land transforms

 Brief Review

 Quiz

Location of Earth’s Hot-spots

TECTONICS

Yellowstone Hot Spot

TECTONICS

Yellowstone Hot Spot

TECTONICS

Types of Plate Boundaries

TECTONICS

● divergent boundaries

● convergent boundaries

● transform fault boundaries

3 types

Continental Rifting: East Africa

Continental Rifting: East Africa

TECTONICS

Red Sea (looking southeast)

TECTONICS Opening of the Red Sea

Opening of the Red Sea

TECTONICS

Formation of Triple Junctions

TECTONICS

ocean-ocean

continent-continent

3 Types of Convergent Plate Margins

Types of Continental Margins

“Active”

 Found along convergent

plate margins:

 Primarily around the

Pacific rim

 Characterized by active

narrow continental

shelves and active

mountain building

processes (earthquakes &

volcanic activity)

 Accretionary wedges of

sediment which are

Types of Continental Margins

“Passive”

 Found within plate

interiors:

 Continental margin not

= a plate margin

Examples are

continental margins

around Atlantic

 Broad continental

shelves consist of thick

wedges of sediment

deposited along margins

 Few earthquakes or

volcanic eruptions

Comparison of Active and Passive

Continental Margins

● Transform fault boundaries

Strike-slip faults where plates slide past each other:

No production/destruction

of material

Most connect mid-ocean ridge segments

Others are “on-land”

transforms like the

San Andreas Fault

Transform Plate Margins

TECTONICS

Transform Plate Margins

TECTONICS

On-Land Transform Faults

San Francisco Peninsula

and San Andreas Fault

In-class exercise Name: GLG 101 Prof Farmer ASU ID:

Compare the continental margin of the west coast of S America with the east coast of N America.

1) South Am. Questions: