Proterozoic Making the Modern World. 2500-543 Myrs 2500 Myr 1600 Myr 1000 Myr.

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Presentation transcript:

Proterozoic Making the Modern World

Myrs 2500 Myr 1600 Myr 1000 Myr

Precambrian

Rocks of the Proterozoic & the Stories They Tell

Anatomy of a Continent Orogenic (Mobile) Belt Basement Rock

Precambrian Cratons: Shields and Platforms

Cratons Shields And Platforms

Canadian Shield

Orogenic (Mobile) Belts

Orogenies = Mountian Building Events Caused by: 1. Collision - Fold and Thrust Mountains

Orogenies = Mountian Building Events Caused by: 2. Subduction - Volcanic (Arc) Mountains

Provinces of the NA Craton A.K.A. “The United Plates of America” Archean Basement Proterozoic Basement Orogenic (Mobile) Belts

Continental Growth Proterozoic

Radioactive Heat Flow Proterozoic

Grenville Orogony (The building of Rodinia) Archean Basement Proterozoic Basement Orogenic Belts

Rocks of the Grenville Orogeny Gyrs

Rodinia “Motherland” Forms Grs Montana New York

Belt Supergroup, Montana West Coast of Laurasia

Mid Continental Rift ( Gyr)

Origin of a Failed Rift

Continental Rift

Keweenawan Supergroup, MI Mesoproterozoic Rift Rocks

Rodinia Rifts (750 Myrs) Montana New York Rifts to form the (pre-Pacific) Panthalassa Ocean Rifts to form the (pre-Atlantic) Iapetus Ocean

Rifting of Rodinia

Gondwana & Laurentia About 500 Myr

Wilson Cycle

Atmospheric Changes Oxygen Increases: Carbon Dioxide Decreases Proterozoic Thanks to…

BIF’s ( Gyrs) Banded Iron Formation 92% Between Gyrs

Iron Source: Hydrothermal Vents

Carol Lake Iron Mine, Canada

Red Beds <1.8 Gyrs After iron in the ocean was used up, it started to accumulate in the atmosphere.

Oxygen Buildup occurs at the Same Time as First Eukaryotes Appear

Atmospheric Changes: UV Protection

Reduced Amounts of Carbon Dioxide Made it Possible for…

Paleoproterozoic (2.2 Gyr) Gowganda Fm, Canada Tillite Varves The First Ice Age

Major “Ice Ages” in Earth History

Glacial Evidence from Neoproterozoic Rock for Varangian Ice Age

Neoproterozoic Snowball Earth

Carbon Storage

Where Did All the Atmospheric Carbon Dioxide Go?

The Carbon Thermostat

Neoproterozoic (Varangian) Ice Age ( Myr) Tillite Carbonates & Ironstones

Snowball Earth

12 C Signature in Snowball Deposits

Carbon Isotopes & Snowball Earth

Why Banded Iron Formations?

Ice Age Ends at the Same Time the First Multi- Celled Animals Appear Coincidence or not?