Robin Armit
... The Paralana Fault Zone is interpreted as a crustal-scale shear zone. Preserved within this shear zone is a record of protracted activity at varying crustal levels since at least the Mesoproterozoic. An early ductile sinistral transpressive regime is related to D3 NW-SE shortening and retrograde met ...
... The Paralana Fault Zone is interpreted as a crustal-scale shear zone. Preserved within this shear zone is a record of protracted activity at varying crustal levels since at least the Mesoproterozoic. An early ductile sinistral transpressive regime is related to D3 NW-SE shortening and retrograde met ...
The Appalachian Mountains: Deposition-Subduction
... beginning of the growth of Pangea. Following the Taconic event about 300 Ma was another major orogeny, the Alleghenian. The collision of the African (Gondwana) and North American plates raised the Appalachians to Himalayan-scale ranges. Around 220Ma Pangea began rifting apart. Crustal stretching pro ...
... beginning of the growth of Pangea. Following the Taconic event about 300 Ma was another major orogeny, the Alleghenian. The collision of the African (Gondwana) and North American plates raised the Appalachians to Himalayan-scale ranges. Around 220Ma Pangea began rifting apart. Crustal stretching pro ...
Plate Tectonics U2L4 Cloze Name: ______ 1. The supercontinent
... 1. The supercontinent called ________ formed 300 million years ago and began to break up 200 million years ago. 2. The process by which new oceanic lithosphere sea floor forms when magma rises to Earth’s surface, called ________ _________, occurs at mid-ocean ridges and solidifies, as older existing ...
... 1. The supercontinent called ________ formed 300 million years ago and began to break up 200 million years ago. 2. The process by which new oceanic lithosphere sea floor forms when magma rises to Earth’s surface, called ________ _________, occurs at mid-ocean ridges and solidifies, as older existing ...
Recent Research Results: Jer-Ming Chiu
... earthquakes occurred as a consequence of young and active mountain building processes in the Taiwan region. A few tectonic models have been proposed to interpret the orogenic process in the Taiwan region based on seismic profiles, surface geologic data, results from modern seismic tomographic invers ...
... earthquakes occurred as a consequence of young and active mountain building processes in the Taiwan region. A few tectonic models have been proposed to interpret the orogenic process in the Taiwan region based on seismic profiles, surface geologic data, results from modern seismic tomographic invers ...
Geology of the Feather River
... Subduction results in remelted material (magma) which rises because it is less dense to form new crust Plate margins are places of brittle and ductile deformation The past is the key to the present…geologic processes are dynamic ...
... Subduction results in remelted material (magma) which rises because it is less dense to form new crust Plate margins are places of brittle and ductile deformation The past is the key to the present…geologic processes are dynamic ...
The Appalachian Story sheet
... 16. The layers of mud are now tilted almost ______________________ to their original position. 17. Evidence for the over-riding thrust fault still visible is shown by the presence of crushed rocks, which is referred to by a French name for mixture: "____________________________". 18. The original sp ...
... 16. The layers of mud are now tilted almost ______________________ to their original position. 17. Evidence for the over-riding thrust fault still visible is shown by the presence of crushed rocks, which is referred to by a French name for mixture: "____________________________". 18. The original sp ...
The Coastal Plain Province
... Largest of Virginia's physiographic provinces, the Piedmont extends from Virginia's "fall line" west to the Blue Ridge Mountains. Elevations range from around 100 feet in the east to more than 1,000 feet in the foothills of the Blue Ridge. Metamorphosed rocks characterize this region: schists, gneis ...
... Largest of Virginia's physiographic provinces, the Piedmont extends from Virginia's "fall line" west to the Blue Ridge Mountains. Elevations range from around 100 feet in the east to more than 1,000 feet in the foothills of the Blue Ridge. Metamorphosed rocks characterize this region: schists, gneis ...
Late Paleozoic Mountain Building
... Late Paleozoic Mountain Building Alleghenian (Appalachian) Orogeny (Hercynian Orogeny in W. Europe) Final Collision of Euramerica with Gondwanaland (N. America/Europe/Africa) Provinces of the Appalachians (from East to West) Coastal Plain (cover sediment of younger age) Piedmont-metamorphic rocks ne ...
... Late Paleozoic Mountain Building Alleghenian (Appalachian) Orogeny (Hercynian Orogeny in W. Europe) Final Collision of Euramerica with Gondwanaland (N. America/Europe/Africa) Provinces of the Appalachians (from East to West) Coastal Plain (cover sediment of younger age) Piedmont-metamorphic rocks ne ...
Quiz 9: Archean Tectonics (Ch. 11) 1. Komatiites are often found in
... 1. Komatiites are often found in greenstone belts. What does this tell us about the Archean which is different from today? peridotite rocks (mantle) melted at higher temperatures near the surface ...
... 1. Komatiites are often found in greenstone belts. What does this tell us about the Archean which is different from today? peridotite rocks (mantle) melted at higher temperatures near the surface ...
NorthShoreGeol - Salem State University
... America during the Permian Period and then moved slightly northward along strike-slip faults. This third event, known as the Alleghenian orogeny, produced the fold belts and mountains of the southern Appalachians and metamorphosed rocks in southern-most New England. These three orogenic events were ...
... America during the Permian Period and then moved slightly northward along strike-slip faults. This third event, known as the Alleghenian orogeny, produced the fold belts and mountains of the southern Appalachians and metamorphosed rocks in southern-most New England. These three orogenic events were ...
A Northern Perspective: The Lake Superior Watershed
... coastlines. A major episode of continental rifting occurred approximately 1 billion years ago in the vicinity of what is now the western portion of the lake. The resulting volcanic activity produced massive lava flows, which later subsided and were folded to form a broad basin structure by tectonic ...
... coastlines. A major episode of continental rifting occurred approximately 1 billion years ago in the vicinity of what is now the western portion of the lake. The resulting volcanic activity produced massive lava flows, which later subsided and were folded to form a broad basin structure by tectonic ...
Assignment 6
... 2. As the supercontinent Pangaea broke up, what kind of margin was western North America? Describe the tectonic interaction that was occurring here, and name the plates involved. ...
... 2. As the supercontinent Pangaea broke up, what kind of margin was western North America? Describe the tectonic interaction that was occurring here, and name the plates involved. ...
Click Here For PDF
... b. Extends from the Atlantic coast to Labrador to Lake Huron c. continues beneath covering Phanerozoic rocks down the eastward side of the US and westward into Texas d. consist of carbonates and sandstones that have been metamorphosed and intruded by igneous bodies e. subjected to the destructive pr ...
... b. Extends from the Atlantic coast to Labrador to Lake Huron c. continues beneath covering Phanerozoic rocks down the eastward side of the US and westward into Texas d. consist of carbonates and sandstones that have been metamorphosed and intruded by igneous bodies e. subjected to the destructive pr ...
Figure 2. Geologic cross section with data from CD
... Organize into groups, with no more than one person from any particular country in any group. Write the name of each state in each state (ask anyone for help) ...
... Organize into groups, with no more than one person from any particular country in any group. Write the name of each state in each state (ask anyone for help) ...
Slide 1
... sediment layers (called varves) ►In Gowgonda Formation varves alternate with tillites ...
... sediment layers (called varves) ►In Gowgonda Formation varves alternate with tillites ...
Proterozoic Evolution of the Western Margin of the
... David Mogk - Montana State University, Joe Wooden - U.S. Geological Survey The Great Falls tectonic zone is dominantly ~1.85 Ga crust deformed at ~1.77 Ga. ...
... David Mogk - Montana State University, Joe Wooden - U.S. Geological Survey The Great Falls tectonic zone is dominantly ~1.85 Ga crust deformed at ~1.77 Ga. ...
Great Lakes tectonic zone
The Great Lakes tectonic zone is bounded by South Dakota at its tip and heads northeast to south of Duluth, Minnesota, then heads east through northern Wisconsin, Marquette, Michigan, and then trends more northeasterly to skim the northern-most shores of lakes Michigan and Huron before ending in the Sudbury, Ontario, Canada, area.During the Late Archean Era the Algoman orogeny added landmass to the Superior province by volcanic activity and continental collision along a boundary that stretches from present-day South Dakota, U.S., into the Lake Huron region near Sudbury, Ontario, Canada.This crustal boundary is the Great Lakes tectonic zone. It is 1,400 km (870 mi) long, and separates the older Archean gneissic terrane to the south from younger Late Archean greenstone-granite terrane to the north.The zone is characterized by active compression during the Algoman orogeny (about 2,700 million years ago), a pulling-apart (extensional) tectonics (2,450 to 2,100 million years ago), a second compression during the Penokean orogeny (1,900 to 1,850 million years ago), a second extension during Middle Proterozoic time (1,600 million years ago) and minor reactivation during Phanerozoic time (the past 500 million years).Collision began along the Great Lakes tectonic zone (GLTZ) with the Algoman mountain-building event and continued for tens of millions of years. During the formation of the GLTZ, the gneissic Minnesota River Valley subprovince was thrust up onto the Superior province's edge as it consumed the Superior province's oceanic crust. Fragmentation of the Kenorland supercontinent began 2,450 million years ago and was completed by 2,100 million years ago. The Wyoming province is the continental landmass that is hypothesized to have rifted away from the southern Superior province portion of Kenorland, before moving rapidly west and docking with the Laurentia supercontinent 1,850 to 1,715 million years ago. Sedimentation from the GLTZ-rifting environment continued into the Penokean orogeny, which is the next major tectonic event in the Great Lakes region. Several earthquakes have been documented in Minnesota, Michigan's Upper Peninsula and Sudbury in the last 120 years along the GLTZ.