Mountain building
Sponsored Links
This presentation is the property of its rightful owner.
1 / 32

Mountain Building PowerPoint PPT Presentation


  • 141 Views
  • Uploaded on
  • Presentation posted in: General

Mountain Building. Faults. A fault is a fracture or in the Earth’s crust that occurs when stress is applied too quickly Area where Earthquakes occur Reverse Normal Strike Slip. Reverse Faults. Reverse faults occur as a result of compression Hanging Wall-The upper part of fault

Download Presentation

Mountain Building

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


Mountain Building


Faults

  • A fault is a fracture or in the Earth’s crust that occurs when stress is applied too quickly

  • Area where Earthquakes occur

    • Reverse

    • Normal

    • Strike Slip


Reverse Faults

  • Reverse faults occur as a result of compression

    • Hanging Wall-The upper part of fault

    • Footwall-The lower part of a fault


Normal Faults

  • Normal faults occur as a result of tension

    • 2 pieces of crust are pulled apart


Strike Slip Faults

  • Strike slip faults occur as a result of shear stress

    • 2 pieces of lithosphere are pulled passed each other

    • San Andreas Fault (San Francisco)


Orogenies

  • An orogeny is a process that forms mountains

  • Alleghanian Orogeny

    • Formed the Appalachians, Paleozoic


Ocean Ridge Mountains

Ocean ridge mountains form when plates diverge and magma rises to the surface


Uplifted Mountains

  • Uplifted mountains form when large regions of Earth have been slowly forced upward as a unit


Fault Block Mountain

  • A fault block mountain forms when large pieces of crust are tilted, uplifted or dropped downward between large faults


Geologic History of the Carolinas and the Piedmont


Geologic Time Scale

  • The geologic time scale is a record of Earth’s History

    • The Earth is 4.6 Billion Years Old

    • The time scale is divided into different subdivision

      • Orogenesis - general term for the processes that produce mountains

      • Orogeny-Mountain building event (plate collision)


North Carolina Geologic Events

  • 3.8 Bya-First life forms evolved

    • Single celled organisms

  • 3.5 Bya-The first continents began to form

    • Convection began due to unequal heating of the mantle (plate tectonics)


North Carolina Geologic Events

  • 1.7 Bya- Present day North Carolina formed

  • 1.3 Bya-The first mountains of North Carolina formed

    • Grenville mountains (no longer exist due to erosion)

    • Formed by Grenville Orogeny

    • Oldest rocks of NC formed. Presently exposed in the Appalachian Mountains


North Carolina Geologic Events

  • 1 Bya-First multicellular organisms

  • 620 mya-North Carolina was pulled apart by tectonic forces

    • Volcanoes developed along NC-VA border


North Carolina Geologic Events

  • 750-540 mya-North America and Europe/ Africa moved towards each other

    • Formed Kings Mountain Belt

    • Formed first supercontinent Rodinia

    • Grenville orogeny

  • 542 mya-”Cambrian Explosion” – Major diversification of life

    • First vertebrates

    • North Carolina was underwater


750 - 540 MYA

Supercontinent of Rodinia

(Grenville Orogeny)


North Carolina Geologic Events

  • 496-440 mya-Taconic Orogeny: The coastline of present day Appalachian Mountains collided with Iapetus Plate (Oceanic Plate)

    • Formed volcanic mountains in present day North Carolina


North Carolina Geologic Events

  • Acadian Orogeny(400-325 mya): A continent called Avalonia collided with present day North America

    • Continued the formation of the Appalachian mountains.

    • Also lead to the formation of Pangaea


North Carolina Geologic Events

  • 359 mya-Wetland forests dominated the Appalachian area

    • The decayed organic matter from the trees eventually lead to coal that is currently mined today


Alleghanian Orogeny

  • AlleghanianOrogeny(325-260 mya): Africa collided with North America.

    • Resulted in the formation of the Appalachian Mountains

    • Pangaea was fully assembled


North Carolina Geologic Events

  • After the formation of Pangaea, the Appalachian Mountains were near the center of Pangaea

    • Central Pangaea Mountains Extended into what is now Scotland and Morocco


North Carolina Geologic Events

  • 251 mya-Appalachians began to erode

    • Wind and rain  Sediment was carried to lower lying land or sea

    • Pangaea was breaking up

  • 200 mya-As Pangaea separated the Atlantic Ocean formed

    • Outer margin became the outer banks


North Carolina Geologic Events

  • 145 mya-65 mya: Coastal Plains were underwater but sea level began to drop

    • Dinosaurs went extinct

    • 65 mya: Coastal plains were above water

  • 5 mya-Blue Ridge and Piedmont were as they are today


North Carolina Geologic Events

  • 1.7 mya-”Ice Age” began. Sea level in North Carolina fell

    • There is present day evidence in the Coastal Plains

  • 18,000 years ago – Glaciers melted

  • 10,000-15,000-North Carolina’s forests began to develop

  • 9,000 BC-Human civilization began


Warm upMonday September 30th

  • Complete the Earth Science Word Search in 12 min for a science ticket


Warm upTuesday October 1st

  • Name the 3 types of faults

  • What orogeny created the Appalachian Mts?

  • What type of mountains are formed when large pieces of crust are tilted, uplifted or dropped downward


Birth of the Mountains Reading Activity

  • Read the handout titled “Birth of Mountains”.

  • On a separate sheet of paper, in complete sentences, write down the 2 most important facts that you learned from each of the following sections….

    a. Introduction

    b. Reading the Rocks

    c. A Supercontinent Forms

    d. The Supercontinent Breaks Up

    e. Continental Collisions

    f. Carving the Mountains


Warm upWednesday October 2nd

  • Look over your NC Earth History notes from yesterday. Pop quiz to follow!!


  • Login