How the formation of the Appalachian Mountains controlled
- Slides: 24
How the formation of the Appalachian Mountains controlled the formation of the United States
Formation of the Appalachians: Proto N. America Taconic Orogeny 1 st island arc ‘docked’ against eastern North America
Formation of the Appalachians Acadia Orogeny (after Taconic) Alleghanian Orogeny: Final closure of ocean basin Taconic Orogeny (first)
Alignment of Appalachians and Caledonides during Pangea
Initial doming & upwarping Pangea begins to break up, just east of the Appalachians
Triple Junction A series of triple junctions form east of the Appalachians
Rift Valley Appalachians over here somewhere North America Future Atlantic Ocean Europe/Africa
Active rift zones of triple junctions align to form long rift valley Failed rift arms (aulacogens) form major continental drainages
Aulacogen Lacustrine deposits at top Basalts & dikes at bottom
East African Rift Zone Similar to aulacogen
Linear sea North America Europe/Africa New Atlantic Ocean
Mature mid-Atlantic ridge North America Europe/Africa Present-day Atlantic Ocean Widening of the Atlantic has taken about 200 million years. In the meantime, the Appalachians -- originally about 30, 000 feet tall -- have been eroding…
… in the meantime Continental Shelf Debris from weathering and erosion of Appalachian Mountains. Distributed downslope by mass wasting and streams/rivers. Starts here, not at the present-day location of the beach 10, 000 - 15, 000 feet thick
Atlantic aulacogens
Failed rift basins (aulacogens) in North America Still seismically active (1906 Charleston ‘quake, numerous earthquakes in New York)
Hard rocks (folded & faulted continental shelf rocks - lots of marine fossils) Hard rocks (island arc rocks, all volcanic) Fall Line (escarpment separating volcanics from coastal plain sediments Coastal Plain (sediment)
Fall Line
Columbia, SC Rapids Broad River
1. 2 Ga rocks (that’s billion years) Taconics (600 million years old) Acadian Rocks Major drainage systems are aulacogens
Putting it all together Coarse material Rock fall Rock slide Talus Creep Fine material Stream transport -> Debris flows Fall Line Mechanical weathering Chemical weathering Beach sand & sedimentation on continental shelf
Yes, these are the Appalachians…
- Appalachian mountains convergent boundary
- Where is the appalachian mountains
- Alleghanian orogeny
- Four regions of nj
- When the starter is bent upward into simple upfold called
- Formation initiale vs formation continue
- Appalachian storage hub
- Appalachian
- The appalachian shoestring fern reproduces asexually
- Products and industries of the 5 regions of virginia
- How were the appalachians formed
- 5 regions of georgia
- Appalachian quilt patterns
- Appalachian range
- Blue ridge region
- Coastal plains region landforms
- Appalachian mountain range
- Physical features of the appalachian plateau in georgia
- Into which hemisphere does the equator place georgia?
- Các châu lục và đại dương trên thế giới
- Glasgow thang điểm
- ưu thế lai là gì
- Tư thế ngồi viết
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- Các châu lục và đại dương trên thế giới