Towards a better understanding of hot spot volcanism
... on the Pacific plate, the northern part moving with greater velocity than the southern part, which undergoes a kind of braking effect exerted by the bloc of the Australian plate (see the 3D diagram). The model shows the region to be the site of an East-West shear band which superimposes on the geogr ...
... on the Pacific plate, the northern part moving with greater velocity than the southern part, which undergoes a kind of braking effect exerted by the bloc of the Australian plate (see the 3D diagram). The model shows the region to be the site of an East-West shear band which superimposes on the geogr ...
Rocks - mrsolomon
... Stratification – layering resulting from changes in the type of sediment being deposited. Ripples marks – wavy marks caused by the action of wind or water on sand. Mud Cracks – Formed when muddy deposits dry & shrink. Fossils – remains or traces of ancient plants or animals. Geode – crystal filled c ...
... Stratification – layering resulting from changes in the type of sediment being deposited. Ripples marks – wavy marks caused by the action of wind or water on sand. Mud Cracks – Formed when muddy deposits dry & shrink. Fossils – remains or traces of ancient plants or animals. Geode – crystal filled c ...
Class notes ()
... 3. How do magmas form? 4. Magmatic differentiation 5. Forms of magmatic intrusion 6. Igneous activity and plate tectonics ...
... 3. How do magmas form? 4. Magmatic differentiation 5. Forms of magmatic intrusion 6. Igneous activity and plate tectonics ...
WEST AFRICAN CRATON West Africa, an area roughly the size of
... appears to be very similar to major Archean shield areas in many other parts of the world. Most of the region appears to consist of highly metamorphosed mafic to felsic gneisses and migmatites representing old basement. Wedged into the basement rocks are narrow greenstone belts of less metamorphosed ...
... appears to be very similar to major Archean shield areas in many other parts of the world. Most of the region appears to consist of highly metamorphosed mafic to felsic gneisses and migmatites representing old basement. Wedged into the basement rocks are narrow greenstone belts of less metamorphosed ...
stress that occurs when an object is squeezed
... The hanging wall moves down relative to the footwall. ...
... The hanging wall moves down relative to the footwall. ...
Update on the Quartzite-Amphibolite Succession at Wollaston Lake
... •Daly Lake & Geikie River groups both contain significant Paleoproterozoic detrital zircons and were deposited rapidly after ca. 1.9 Ga (Tran, 2001). •Based on above, QA Succession could not be younger than the Daly Lake and Geikie River groups. ...
... •Daly Lake & Geikie River groups both contain significant Paleoproterozoic detrital zircons and were deposited rapidly after ca. 1.9 Ga (Tran, 2001). •Based on above, QA Succession could not be younger than the Daly Lake and Geikie River groups. ...
Plate Tectonics Guided Notes NAME__________________________________________________________D_____________P_____
... Collision Zones and Mountains What happens when two continental plates collide? Because the rock making up continental plates is generally _________________________ and ________________ ______________ than oceanic rock, it is too light to get pulled under the earth and ______________ into magma. Ins ...
... Collision Zones and Mountains What happens when two continental plates collide? Because the rock making up continental plates is generally _________________________ and ________________ ______________ than oceanic rock, it is too light to get pulled under the earth and ______________ into magma. Ins ...
Lecture Slides
... 2. Initial Pb must be known/modeled or you must chose minerals that have essentially no initial Pb (zircon, apatite, monazite). 3. 235U/238U known today (1/137.88) and invariant across most of planet. 4. Still a problem, the equation: ...
... 2. Initial Pb must be known/modeled or you must chose minerals that have essentially no initial Pb (zircon, apatite, monazite). 3. 235U/238U known today (1/137.88) and invariant across most of planet. 4. Still a problem, the equation: ...
METAMORPHIC ROCKS
... quartzite which may look the same whether it forms under low-grade to high-grade metamorphic conditions ...
... quartzite which may look the same whether it forms under low-grade to high-grade metamorphic conditions ...
Mining in British Columbia
... British Columbia lies in the Cordilleran Orogen (kord-(y)er-uhn or-uh-jen), a mountain belt that runs along the western edge of the Western Hemisphere continents from Alaska to Antarctica. These mountains formed over tens of millions of years as a result of tectonic collisions between the continents ...
... British Columbia lies in the Cordilleran Orogen (kord-(y)er-uhn or-uh-jen), a mountain belt that runs along the western edge of the Western Hemisphere continents from Alaska to Antarctica. These mountains formed over tens of millions of years as a result of tectonic collisions between the continents ...
South Africa`s Newest Mineral Oasis: Geology of the Salt River
... displays a gradational change from a Cu-rich zone in the southeast to a Zn-Pb-rich zone in the northwestern portion of the deposit. Discussion: Ongoing local and regional-scale geologic and stratigraphic evaluations of the Salt River deposit suggest that the Geelvloer Sequence was deposited in a tec ...
... displays a gradational change from a Cu-rich zone in the southeast to a Zn-Pb-rich zone in the northwestern portion of the deposit. Discussion: Ongoing local and regional-scale geologic and stratigraphic evaluations of the Salt River deposit suggest that the Geelvloer Sequence was deposited in a tec ...
Composition and Evolution of the Lithosphere
... Oldest known rocks are from the Great Slave Province in Canada and are approximately 4 Ga old. Oldest known mineral is a zircon is from Australian sediments whose metamorphic age is 3.5 Ga. Inherited zircons are as old as 4.4 Ga! ...
... Oldest known rocks are from the Great Slave Province in Canada and are approximately 4 Ga old. Oldest known mineral is a zircon is from Australian sediments whose metamorphic age is 3.5 Ga. Inherited zircons are as old as 4.4 Ga! ...
Metamorphic
... • Explain the difference between regional and contact metamorphism. • Distinguish between foliated and nonfoliated metamorphic rocks, and give an example of each. ...
... • Explain the difference between regional and contact metamorphism. • Distinguish between foliated and nonfoliated metamorphic rocks, and give an example of each. ...
Unit 6.3 PowerPoint File
... can occur within continental crust or oceanic crust • Slow movements of tectonic plates change the size and shape of the continents over millions of years. ...
... can occur within continental crust or oceanic crust • Slow movements of tectonic plates change the size and shape of the continents over millions of years. ...
Class notes ()
... 3. How do magmas form? 4. Magmatic differentiation 5. Forms of magmatic intrusion 6. Igneous activity and plate tectonics ...
... 3. How do magmas form? 4. Magmatic differentiation 5. Forms of magmatic intrusion 6. Igneous activity and plate tectonics ...
Natural woNders of GeorGia
... is unique as a natural wonder of Georgia in that it was caused by relatively recent erosion (from human activity) over the past 200 years. Hence, it is more anthropogenic than natural. Historical accounts indicate that the canyon began forming in the early 1800s as the result of poor soil management ...
... is unique as a natural wonder of Georgia in that it was caused by relatively recent erosion (from human activity) over the past 200 years. Hence, it is more anthropogenic than natural. Historical accounts indicate that the canyon began forming in the early 1800s as the result of poor soil management ...
Convergent and Divergent plate boundaries
... 2. Stretching of the crust causes large crustal blocks to drop down along faults, forming a continental rift, like in the Great Rift Valley. The down-dropped blocks may form basins that can trap sediment and water, resulting in lakes. Deep rifting causes solid mantle material in the asthenosphere t ...
... 2. Stretching of the crust causes large crustal blocks to drop down along faults, forming a continental rift, like in the Great Rift Valley. The down-dropped blocks may form basins that can trap sediment and water, resulting in lakes. Deep rifting causes solid mantle material in the asthenosphere t ...
Types of Rocks - Sikkimsprings
... the horizontal. The dip is an angle of the bed with the horizontal plane. The line of intersection of a dipping bed, with the ground surface is called strike. Strike has a direction. ...
... the horizontal. The dip is an angle of the bed with the horizontal plane. The line of intersection of a dipping bed, with the ground surface is called strike. Strike has a direction. ...
Chapter 11
... the formation of continental masses? Each of Earth's major plates is actually a collage of many crustal pieces acquired from a variety of sources. Accretion, or accumulation, has occurred as crustal fragments of ocean floor, curved chains (or arcs) of volcanic islands, and other pieces of continenta ...
... the formation of continental masses? Each of Earth's major plates is actually a collage of many crustal pieces acquired from a variety of sources. Accretion, or accumulation, has occurred as crustal fragments of ocean floor, curved chains (or arcs) of volcanic islands, and other pieces of continenta ...
a brief introduction to the geology and mining industry of tanzania
... continent as a whole. Its present appearance is a result of a series of events that began with evolution of Archean shield, followed by its modification through metamorphic reworking and accretion of other continental rocks, in turn covered by continentally derived sediments. Pre-rift magmatism foll ...
... continent as a whole. Its present appearance is a result of a series of events that began with evolution of Archean shield, followed by its modification through metamorphic reworking and accretion of other continental rocks, in turn covered by continentally derived sediments. Pre-rift magmatism foll ...
Newid tectoneg 1
... At least twice during this long period in Earth's history the positions of the continents and their effect upon ocean currents caused the Earth to enter an ice age (at about 2300 and 700 million years ago). There is evidence for this second ice age in rocks from the Skerries just to the north of Ang ...
... At least twice during this long period in Earth's history the positions of the continents and their effect upon ocean currents caused the Earth to enter an ice age (at about 2300 and 700 million years ago). There is evidence for this second ice age in rocks from the Skerries just to the north of Ang ...
File
... 1. The last type of plate movement you will explore is when continental plates slide past each other (transform plate boundaries). 2. Remove the 2 soft chocolate chip cookies and place them to the side. 3. Place the 2 hard chocolate chip cookies onto the icing. 4. Push the 2 cookies together. 5. App ...
... 1. The last type of plate movement you will explore is when continental plates slide past each other (transform plate boundaries). 2. Remove the 2 soft chocolate chip cookies and place them to the side. 3. Place the 2 hard chocolate chip cookies onto the icing. 4. Push the 2 cookies together. 5. App ...
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.