Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock

Slides:

Advertisements

Similar presentations

Continents change position over time

Advertisements

The Geology and Geological History of Vancouver Island Steven Earle, PhD Department of Geology Malaspina University-College Nanaimo, British Columbia,

Rifting Triassic. Rifting along Atlantic margin. Subduction along west coast. Gulf of Mexico opens. Sandstones filling rift basins along east coast, Newark.

Landform Geography Earth’s Internal Structure, Rock Cycle, and Geologic Time.

Plate boundaries II extension. Increasing heat causes uplift and fault development, which in turn creates steep- sided valleys bounded by faults. A variety.

3 types of rocks.

Where in Georgia do you find Sediments & Sedimentary Rocks? Coastal Plain Province Valley & Ridge Province* In all provinces, young sediments are associated.

The Grand Canyon Tells the Story of North America Knowing how and where rocks are formed allows us to read the story written in the rocks. A mile thickness.

Plate Tectonics.

03.05.a1 Ocean-Ocean Convergent Boundary One plate moves down = subduction Two oceanic plates move toward one another Trench and island arc.

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

Mesozoic Geology Beginning of the Modern World. Mesozoic Myr.

Sedimentary Rocks Interpretations.

The Olympic Mountains A Wedge of Fun. Olympic Mountains, Wilapa Hills & Oregon Coast Range E-1.

Rodinia, Rifting, Iapetus and the Great American Bank

Late Paleozoic Earth History

The Growth of Western North America Exotic Terranes Photo of Mt Shuksan by Patti Bleifuss.

The History of the Earth The evolution of the continents.

April 17 Plate Tectonics Allen.

Geology 12 Presents.

Plate Tectonics. Plate Tectonics What is Plate Tectonics The Earth’s crust and upper mantle are broken into sections called plates Plates move around.

The Geologic Record and the Environment. Geologic Time Evidence suggests Earth is approximately 4.6 billion years old! Earth’s history is divided into.

Tectonic boundaries and hot spots. A useful reference dynamicearth/sitemap.html

GEOLOGY OF SVALBARD SVALEX 2006 Arild Andresen A Window into the Barents Sea Hydrocarbon Province.

The Proterozoic Eon of Precambrian Time

Virginia Physical Geography. The Physiographic Provinces of Virginia Virginia has had a long, complex geologic history, over 1.1 billion years Events.

Plate Tectonics. Plate Boundaries  There are 3 main plate boundaries:  1) Convergent Boundary  2) Divergent Boundary  3) Transform Boundary.

Pacific Northwest Geology. Northwest Geology Starting points We’re interpreting events & conditions in the past using available evidence – the rock record.

Early Paleozoic Earth History

Yukon & Alaska. Our Route in Canada & Alaska Yukon: Drainage Divides Peel River Drainage Area Yukon River Drainage Area Mackenzie River Drainage Area.

The Cambrian System of Wyoming Ga Grenville orogen: Continent-continent collision Continent-continent collision of Laurentia with African and.

California Geologic History Part I: Pre-San Andreas Fault System.

The Early Paleozoic World: the paleogeography of the Cambrian Earth EPSC-233 Earth & Life History (Fall 2002)

Geology of Virginia Why? Pulls together what they already know: Rocks Plate Tectonics Wilson Cycles Geologic Structures Stratigraphic Principles/Sequence.

READING ASSIGNMENTS - Revised 26 Oct., 2003

Precambrian Geology.  Comprises 88% of geologic time  Precambrian has 2 Eons  Geology hard to Study...  Preserved rocks are metamorphosed  Very few.

The Sea Floor. Origin of the Ocean Water vapor released during degassing of early earth –volcanism Salt from chemical weathering.

ROCKS!. Rocks There are 3 rock types: - Sedimentary - Igneous - Metamorphic -All 3 types can be found in Canada.

The Rocky Mountains by. Geologic events The Rockies are composed exclusively of layered sedimentary rocks. These include limestone, dolomite, sandstone.

Continental Drift, Plate Tectonics, and Seafloor Spreading Physical Geography 110.

Types of rocks.

 Formed from sediments.  Sediments - rock fragments, mineral grains, or animal & plant remains.

Our Amazing Planet. Engage Assignment Make a 3 slide power point on each of the three types of plate boundaries – Convergent boundaries – Divergent boundaries.

The Sea Floor GLG Physical Geology Bob Leighty.

Do Now. The theory of plate tectonics explains that earth’s lithosphere moves due to the unbalanced forces occurring within the mantle. Alfred Wegner.

Ocean Topography.

Part 1: The Vendian, Cambrian, and Early Ordovician Periods

Chapter 4: Marine Provinces. Seismic profiling Fig. 4-4.

Harry Williams, Historical Geology1 HISTORICAL GEOLOGY LECTURE 11. EARLY MESOZOIC GEOLOGY. TRIASSIC-JURASSIC ( MYBP) Introduction: The Mesozoic.

PLATE TECTONICS A Summary & Review GEOL 1033 Lecture ppt file ) (Lesson 21)

Harry Williams, Historical Geology1 HISTORICAL GEOLOGY LECTURE 10. LATE PALEOZOIC GEOLOGY I. The Late Paleozoic (Devonian-Mississippian- Pennsylvanian-Permian)

The earth rotates on its axis from west to east, causing places in the east to see the sun first.

The arrival of plate tectonics was a scientific revolution: Plate tectonic theory states that the Earth's surface is broken into rigid lithospheric plates.

How Do Ice Ages form? Changes in the earth's orbit cause less sunlight to fall on the northern hemisphere during summer Northern ice sheets melt less.

Evidence for Continental Drift Early maps of the world caused Alfred Wegener to propose the continental drift theory (early 20 th c.). The continents.

Major Break-up You’re Trapped! In the ZONE Under Da.

GEOL& 115 Geology of the National Parks (= ESS 305 at UW)

Prominent Geological Features of the Lion’s Head Nature Reserve The land tells a few tall tales...

North American Geological History. So what did we figure out about the East Coast so far? Proterozoic: suture zone, rifting Cambrian: passive margin Ordovician:

Bellringer Explain in complete sentences what are pros and cons of coal energy use.

Mississippi River Valley Fossils Around the Twin Cities Summit Avenue and Great River Blvd, St. Paul.

California’s Geologic History. Location, location, location…  Three continental plates come together  Very complex history.

Continental Drift and Plate Tectonics (notes pt. 2)

The Geological History of British Columbia

Plate Tectonics Chapter 4 Lesson 1 Pages

Plate Tectonics.

Kootenai Falls Field Trip Geology 201, Spring 2009

Plate boundaries & convection currents

LECTURE 11. EARLY MESOZOIC GEOLOGY.

LECTURE 10. LATE PALEOZOIC GEOLOGY I.

Presentation transcript:

Belt/Purcell Supergroup Oldest Rocks resting on NW Basement Rock Glacier National Park

Extent of the Belt/Purcell Rocks A-4 Extent of the Belt/Purcell Rocks (from Burchfiel, Cowan, and Davis, 1992)

A-5 Belt-Age Rocks (from Winston, 1971)

A-5 Belt Thickness East (Montana) West (Idaho) 15-20 km

Rock Types Shales Red Green Sandstones Limestones Diabase Intrusions (Type of mafic igneous rock between a basalt & gabbro) Belt Supergroup - Glacier National Park, Montana (Linda Kah).

Belt Structures - Shales/Sandstone Laminations Mudcracks Ripples Raindrop Impressions Salt Crystal Impressions

Belt Structures - Limestones Stomatolites

Shallow Marine - Intertidal Zone Modern Stromatolites Shallow Marine - Intertidal Zone

Sediment Source: East & West (from Burchfiel, Cowan, and Davis, 1992)

Age of the Belt Basalt on top = 750 to 830 Myrs Age: Between about Supergroup Belt Intrusiuons: ca. 1,200 Myrs Mostly between 1,500 & 1,200 Myrs ? Youngest Basement Rock - 1,576±13 Myrs

Interpretations Red Shale Green Shale Sandstone Limestone Stomatolites Laminations Mudcracks Ripples Salt Crystals Western Source Diabase Intrusions Quiet: Land/shallow ocean Quiet: Deeper ocean Beach/river Shallow tropical ocean Quiet water / no animals Arid land surface Intertidal zone/beach Salty Water Land to the west Hot spot / Divergent zone

Interpretations - Big Picture Marine Embayment Salty Lake Inland Sea caused by Rifting

Continental Rift

Modern Inland Seas Black Sea Caspian Sea

Did the Belt Rifted Apart? East (Montana) West Belt Supergroup Where did it go? Fault Bounded

Rodinia “Motherland” The World about 800 Myrs A-6 Montana (Belt) New York Rodinia “Motherland”

A-7

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

Rifting of Rodinia

Windermere Supergroup As Rift Spread Apart Seiments Accumulate on the Margin of North America Windermere Supergroup (750-540 Myrs)

Extent of the Windermere Rocks A-4 Extent of the Windermere Rocks (from Burchfiel, Cowan, and Davis, 1992)

Windermere-Aged (750-550 Myrs) Rocks (from Winston, 1971)

Windermere: Toby Formation Tillite Late Proterozoic Ice Age

Major “Ice Ages” in Earth History 5 Major “Ice Ages” in Earth History 4 3 2 1

Glacial Evidence for late Proterozoic Ice Age

Snowball Earth?

Post-Rifting West Coast Became a Passive Margin 750 to 200 Myrs Ago Continental Shelf Sediments Ocean North America Direction of Plate Motion

A-6 Belt Supergroup Windermere Supergroup Continental Shelf Deposits