What caused the Physiographic provinces of Georgia?
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What caused the Physiographic provinces of Georgia? PowerPoint PPT Presentation


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What caused the Physiographic provinces of Georgia?. Georgia’s Physiographic Provinces. Coastal Plain Recent sediments at coast to soft sedimentary to NW Flat-lying strata Age: Recent to Late Mesozoic Piedmont Igneous and metamorphic rocks

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What caused the Physiographic provinces of Georgia?

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What caused the Physiographic provinces of Georgia?


Georgia’s Physiographic Provinces

Coastal Plain

Recent sediments at coast to

soft sedimentary to NW

Flat-lying strata

Age: Recent to Late Mesozoic

Piedmont

Igneous and metamorphic rocks

Heavily folded and faulted

Age: Paleozoic and some Precambrian

Blue Ridge

Igneous and metamorphic rocks

Heavily folded and faulted

Age: Paleozoic and some PC

Ridge and Valley

Sedimentary rocks

Gently folded and faulted

Age: Paleozoic

Appalachian Plateau

Same rocks and age

Dipping gently to west


Plate Tectonics


Plate Properties


Plate thicknesses:Ocean plates = 5 km avg.Continental plates = 100 km avg.


1. 700 – 600 mya: Rifting of Supercontinent Rodinia forms the Iapetus Ocean

Precambrian Rodinia igneous and metamorphic rocks brought to surface along western edge of Piedmont through thrust-faulting during Appalachian Mtn. formation.


Cartersville Fault

Appalachian Plateau

Fall Line

Ridge and Valley

Blue Ridge / Piedmont

Coastal Plain

Rifted African Plate

Cross Section of Physiographic Provinces


2. 600-400 mya: Iapetus Ocean closing.0ceanic-oceanic convergent boundary forms volcanic Taconic island arc. Taconic orogeny occurs when island arc exotic terrane and flysch accrete to N. America. Thrust faulting, folding, and metamorphism of igneous volcanic rocks.

These igneous and metamorphic rocks form the Blue Ridge Province.

Western Iapetus


Cartersville Fault

Appalachian Plateau

Fall Line

Ridge and Valley

Blue Ridge / Piedmont

Coastal Plain

Rifted African Plate

Cross Section of Physiographic Provinces


3. 400-350 mya: Iapetus closing. Second island arc called Avalon accretes to N. America. Compression, thrusts, metamorphism of flysch and volcanic rocks.


Cartersville Fault

Appalachian Plateau

Fall Line

Ridge and Valley

Blue Ridge / Piedmont

Coastal Plain

Rifted African Plate

Cross Section of Physiographic Provinces


4. 300 mya: Eastern Iapetus closes, Pangea forms. Alleghenian orogeny occurs with continental-continental convergent boundary. Folding and thrusting.

These igneous and metamorphic rocks form the Piedmont provinceThrust faulting of continental sedimentary rocks forms Ridge and Valley province and Appalachian Plateau.


Cartersville Fault

Appalachian Plateau

Fall Line

Ridge and Valley

Blue Ridge / Piedmont

Coastal Plain

Rifted African Plate

Cross Section of Physiographic Provinces


4.250 mya – present: Rifting of Pangea forms the Atlantic Ocean. Normal faulting. Divergent boundary forms. Passive plate margin. Weathering and erosion.

Coastal Plain Province and continental shelf composed of late Mesozoic and Cenozoic sediments.


Cartersville Fault

Appalachian Plateau

Fall Line

Ridge and Valley

Blue Ridge / Piedmont

Coastal Plain

Rifted African Plate

Cross Section of Physiographic Provinces

Taconic terrane

Avalon terrane


Georgia’s Physiographic Provinces

Coastal Plain

Recent sediments at coast to

soft sedimentary to NW

Flat-lying strata

Age: Recent to Late Mesozoic

Piedmont

Igneous and metamorphic rocks

Heavily folded and faulted

Age: Paleozoic and some Precambrian

Blue Ridge

Igneous and metamorphic rocks

Heavily folded and faulted

Age: Paleozoic and some PC

Ridge and Valley

Sedimentary rocks

Gently folded and faulted

Age: Paleozoic

Appalachian Plateau

Same rocks and age

Dipping gently to west


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