the paleozoic worldpages.geo.wvu.edu/~kammer/g3/13.pdf · 2015-03-04 · the paleozoic world...
TRANSCRIPT
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Outline 13:The Paleozoic World
Shallow marine and terrestrial facies
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Shallow marine facies• Sea level was much higher than today
during much of the Paleozoic.• Shallow epicontinental seas flooded
continental interiors.• Rocks with marine fossils are common
in the centers of continents.• Beach deposits like Seneca Rocks are
also common.
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Present Day Sea Level
History of Sea Level Change. Sea Level today is low compared to the overall record.
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Barrier Islands, bays, and
continental shelf on the New Jersey coast.
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Aerial view of a barrier island
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Devonian Sedimentation in WV
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Devonian Sedimentation in WV
Marcellus black shale
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Devonian Paleogeography
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http://www.nvcc.edu/home/cbentley/gol_135/sideling_hill/images/VR_stratigraphy.jpg
Sedimentary wedges associated with orogenic events
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Seneca Rocks, WV – Paleozoic barrier island deposits; folded and turned on end.
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Environmental Geoscience Students
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With Environmental Geoscience Students
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Seneca Rocks is a limb of the Wills Mountain Anticline in eastern WV
Jack Renton
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Coal Deposits
• Most of the world’s coal deposits formed during the Carboniferous. Why?
• Woody plants evolved in the Devonian. These are the plants that form coal.
• Carbon dioxide levels were 10X higher in the early Paleozoic.
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CO2 falls as coals form
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Coal Deposits
• Carbon dioxide levels were reduced to modern levels by the end of the Paleozoic.
• What happened to all that CO2?• The carbon was converted to wood,
then to peat, then to coal. The oxygen was released to the atmosphere.
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Chemical Formulas
• Photosynthesis:6H2O + 6CO2 C6H12O6 (sugar) + 6O2
• Sugar forms cellulose or wood:C6H10O5 (cellulose) + H2O
• Wood changes to peat, lignite, bituminous coal, and anthracite under heat and pressure:
C6 (coal) + 5H2O • Anthracite is almost pure carbon
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(Berner, 2007)
Oxygen and CO2 levels during the Phanerozoic
PAL = Present Atmospheric Level of Oxygen
R = ratio of CO2 to present day level
PaleozoicMesozoic Cenozoic
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Coal Deposits
• Did extensive coal ever form again?• CO2 levels increased again in the
Cretaceous and the early Cenozoic, the only other times of significant coal formation.
• Very little coal is forming today.
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Coals form again
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The Nile Delta. Shaped like the
Greek letter delta.
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The Mississippi River delta
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A meandering stream with a sandy point bar on the inside curve, and a cut bank on the
outside curve. The point bar dips toward the stream channel.
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Pennsylvanian point bar deposits on WV Rt. 19 near Fayetteville.
coal seam point bar surfaces
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A modern swamp in Louisiana
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Model for Pennsylvanian coal formation
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WV
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Carboniferous forest with scale
trees
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Lycopodium, descendant of scale trees
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WVU Students: Fossil tree in Wyoming coal mine
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Upper Freeport Coal with overlying fluvial sandstones deposited by meandering river.
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Coal outcropping in Morgantown. Can be up to 10 ft. thick.
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Coal Mining Methods
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Underground mine. Limestone dust sprayed on the coal to reduce coal dust.
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Underground Machines
Longwall Shearer Continuous Miner
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Mountain top removal – it ain’t pretty
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Drag Line on Mountaintop Mine
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These are big shovels
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Final Reclamation
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Wyoming coal seams are up to 100 ft. thick!
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Wyoming coal seams are up to 100 ft. thick!
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Truck from previous photo with WVU Field Camp students
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Cyclothems
• Cyclothems are cyclic sequences of marine and nonmarine facies. The facies are repeated. Counted by coals.
• Repeated fluctuations of sea level produced the cyclothems.
• Sea level fluctuations associated with fluctuating glaciers on Gondwana.
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Cyclothems
• There are about 50 cyclothems in the Illinois Coal Basin. These are tied to worldwide changes in sea level.
• There are about 90 cyclothems in the WV Coal Basin. The extra 40 were caused by delta shifting as rivers changed courses.
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Rapid fluctuations in sea level during the Pennsylvanian as ice
volumes at the South Pole expanded and contracted.
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One cyclothem: cycles from
nonmarine to marine
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Pennsylvanian Cyclothems in Kentucky –count the coals
12
34 5
6
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Pennsylvanian rocks of the Pittsburgh Fm. on I-79 near Carnegie, PA. White rocks are freshwater limestones formed in lakes.
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Cyclothems are created by alternating
transgression and regression of
epicontinental seas.
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Delta Shifting on the Mississippi Delta.Delta shifting can form local cyclothems.
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A modern marine transgression is exposing Holocene peat deposits on the Louisiana coastline.
This transgression is caused by subsidence associated with delta shifting.
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Model of coal formation for Pennsylvania cyclothems.
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U.S. Coal Production
• Wyoming is #1 overall in tonnage. Coal is sub-bituminous, and low in sulfur.
• West Virginia is #2 overall, but #1 east of the Mississippi River. Coal is bituminous and has 3X more BTUs than Wyoming coal, but is higher in sulfur.
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Coalfields of the United States