Crack structure in oceanic crust: A seismic anisotropy study in the
... km2. Using tomography to invert ∼69,000 Pn and Pg arrivals, we obtained a three-dimensional velocity-depth model of the upper crust beneath the CRR, discovering a variable velocity structure beneath the axis. By fitting the traveltime residuals of our tomography result with a cosinusoid curve compos ...
... km2. Using tomography to invert ∼69,000 Pn and Pg arrivals, we obtained a three-dimensional velocity-depth model of the upper crust beneath the CRR, discovering a variable velocity structure beneath the axis. By fitting the traveltime residuals of our tomography result with a cosinusoid curve compos ...
3.3 Plates Move Apart
... What is different? In this case, rift valley’s happen on land. Two piece of land are pulled apart, revealing magma. (it will cool and harden) Creating what is called a continental rift valley (it could fill with water, making a lake.) ...
... What is different? In this case, rift valley’s happen on land. Two piece of land are pulled apart, revealing magma. (it will cool and harden) Creating what is called a continental rift valley (it could fill with water, making a lake.) ...
Adakites and the Origin of Cu, Au and Mineralisation
... Chalcophile and siderophile elements, like copper, gold and indium, provide resources vital to developed societies and are an important part of the financial engine for the development of emerging economies. Many of these elements have a fundamental magmatic genesis, but can we predict which intrusi ...
... Chalcophile and siderophile elements, like copper, gold and indium, provide resources vital to developed societies and are an important part of the financial engine for the development of emerging economies. Many of these elements have a fundamental magmatic genesis, but can we predict which intrusi ...
The Fossil Record and Evolution
... Usually occur in glacial lakes or those that freeze over in winter. Coarser sediments are deposited in summer. Winter-summer layers are called COUPLETS. Couplets in lakes are known as VARVES. Count the couplets back from the sediment surface to determine numerical age. ...
... Usually occur in glacial lakes or those that freeze over in winter. Coarser sediments are deposited in summer. Winter-summer layers are called COUPLETS. Couplets in lakes are known as VARVES. Count the couplets back from the sediment surface to determine numerical age. ...
Forest River – Field Trip
... Erosion produces gaps in the rock record. Assume that the rocks exposed here at Forest River Park are approximately 400 million years old and were formed 3 miles (~15,8400 feet) beneath the surface, as indicated by the mineralogy and texture of the large intrusions. The local sediments overlying the ...
... Erosion produces gaps in the rock record. Assume that the rocks exposed here at Forest River Park are approximately 400 million years old and were formed 3 miles (~15,8400 feet) beneath the surface, as indicated by the mineralogy and texture of the large intrusions. The local sediments overlying the ...
ppt
... We will set up a schedule where one student will pose a question to the class about one of the main topics from the last lecture. Rest of the class will turn in their answer, after which the student asking the question will explain the answer ...
... We will set up a schedule where one student will pose a question to the class about one of the main topics from the last lecture. Rest of the class will turn in their answer, after which the student asking the question will explain the answer ...
No Slide Title - University of South Alabama
... together into a “supercontinent” he called Pangaea ...
... together into a “supercontinent” he called Pangaea ...
GEOL100 4-5-10 Historical Geology of North America
... Colorado Plateau is remarkably stabile. Relatively little rock deformation has affected this high, thick crustal block within the last 600 million years or so. In contrast, the plateau is surrounded by provinces that have suffered severe ...
... Colorado Plateau is remarkably stabile. Relatively little rock deformation has affected this high, thick crustal block within the last 600 million years or so. In contrast, the plateau is surrounded by provinces that have suffered severe ...
igneous rocks - Cloudfront.net
... Layers of Sedimentary Rock The layers that were deposited first will be on the bottom. So, oldest layers of rock are on the bottom and the newest layers of rock are on the top Layers of rock can be dated and can tell us a lot of information about the conditions and the species the lived when ...
... Layers of Sedimentary Rock The layers that were deposited first will be on the bottom. So, oldest layers of rock are on the bottom and the newest layers of rock are on the top Layers of rock can be dated and can tell us a lot of information about the conditions and the species the lived when ...
Proterozoic History
... 3.1 Basic Intrusive Rocks After the growth and stabilization of the Late Archean—Early Proterozoic crustal blocks, the continents were subjected to extensional forces, and deep-seated major fault and fracture systems were established. These fractures and zones of weakness acted as conduits for a ran ...
... 3.1 Basic Intrusive Rocks After the growth and stabilization of the Late Archean—Early Proterozoic crustal blocks, the continents were subjected to extensional forces, and deep-seated major fault and fracture systems were established. These fractures and zones of weakness acted as conduits for a ran ...
GEOL_02_study_guide
... oceanic crust stay below sea level); think about the next question when you answer this one? What is more dense, oceanic or continental crust? Why? What are the three types of plate boundaries (and describe them)? Why does oceanic crust subduct beneath continental crust and not the other way around? ...
... oceanic crust stay below sea level); think about the next question when you answer this one? What is more dense, oceanic or continental crust? Why? What are the three types of plate boundaries (and describe them)? Why does oceanic crust subduct beneath continental crust and not the other way around? ...
Science Chapter 3 - Plymouth Christian School
... • sedimentary rock – a type of rock that forms when sediments are pressed together in layers ...
... • sedimentary rock – a type of rock that forms when sediments are pressed together in layers ...
class outline - WordPress.com
... briefly reviews some key points and adds details about the causes of metamorphism and the plate tectonic settings where metamorphism occurs. We check on comprehension with a few conceptest questions (e.g., slides 4, 5). The remainder of the lesson focuses on the rock cycle and compares and contrasts ...
... briefly reviews some key points and adds details about the causes of metamorphism and the plate tectonic settings where metamorphism occurs. We check on comprehension with a few conceptest questions (e.g., slides 4, 5). The remainder of the lesson focuses on the rock cycle and compares and contrasts ...
Lecture W6-L15-17
... What are the physical ways of magma movement? Three possibilities are considered: bulk movement (diapirs of magma); infiltration/movement via dykes; and movement helped by deformation (into active shear zones/faults). Departement of Geology, Geography and Environmental Studies ...
... What are the physical ways of magma movement? Three possibilities are considered: bulk movement (diapirs of magma); infiltration/movement via dykes; and movement helped by deformation (into active shear zones/faults). Departement of Geology, Geography and Environmental Studies ...
Andean margin
... has flipped and the next scenario is an Andean margin along northern Australia! ...
... has flipped and the next scenario is an Andean margin along northern Australia! ...
Directions: Select the best answer for each item. (8.P.1A.3) Some
... d. The remains of Mesosaurus were carried across the ocean by predators. ...
... d. The remains of Mesosaurus were carried across the ocean by predators. ...
1 0 .
... 10. Lithosphere – Movements of Tectonic Plates The Earth’s Crust was divided into many segments – litospheric (tectonic) plates. These plates are moving. The speed of this movement is 1 – 5 cm per year. Crustal plates can converge, diverge, collide with each other, slide under each other or move hor ...
... 10. Lithosphere – Movements of Tectonic Plates The Earth’s Crust was divided into many segments – litospheric (tectonic) plates. These plates are moving. The speed of this movement is 1 – 5 cm per year. Crustal plates can converge, diverge, collide with each other, slide under each other or move hor ...
Oceanic Crust - River Dell Regional School District
... Iceland: An example of continental rifting • Iceland has a divergent plate boundary running through its middle ...
... Iceland: An example of continental rifting • Iceland has a divergent plate boundary running through its middle ...
3.3 Plates Move Apart
... What is different? In this case, rift valley’s happen on land. Two piece of land are pulled apart, revealing magma. (it will cool and harden) Creating what is called a continental rift valley (it could fill with water, making a lake.) ...
... What is different? In this case, rift valley’s happen on land. Two piece of land are pulled apart, revealing magma. (it will cool and harden) Creating what is called a continental rift valley (it could fill with water, making a lake.) ...
Melting of the mantle
... Further dehydration takes place at greater depths as other hydrous phases become unstable, including amphibole at about 3 GPa. The slab crust is successively converted to blueschist, amphibolite, and finally anhydrous eclogite as it reaches about 80-100 km depth. In most (mature) arcs, the temper ...
... Further dehydration takes place at greater depths as other hydrous phases become unstable, including amphibole at about 3 GPa. The slab crust is successively converted to blueschist, amphibolite, and finally anhydrous eclogite as it reaches about 80-100 km depth. In most (mature) arcs, the temper ...
Snack Tectonics Name ______________ Student Learning
... a. Spread frosting into a layer about half a cm thick on your wax paper. b. Tell students that the frosting in this model represents the _________________, the viscous layer on which Earth's plates ride. The plates in this model are represented by fruit roll up (oceanic crust which is thin and dense ...
... a. Spread frosting into a layer about half a cm thick on your wax paper. b. Tell students that the frosting in this model represents the _________________, the viscous layer on which Earth's plates ride. The plates in this model are represented by fruit roll up (oceanic crust which is thin and dense ...
Geochronology and provenance analysis of basement and clastic
... The San Juan Unit hosts ultramafic and gabbroic mafic cumulates, which yield an oceanic plateau geochemical signature, similar to the Pallatanga Unit (Mamberti et al., 2004). U/Pb (SHRIMP) analyses of homogeneous zircons extracted from a gabbro in the San Juan Unit yielded an age of 87.1 ± 0.8. Ma. ...
... The San Juan Unit hosts ultramafic and gabbroic mafic cumulates, which yield an oceanic plateau geochemical signature, similar to the Pallatanga Unit (Mamberti et al., 2004). U/Pb (SHRIMP) analyses of homogeneous zircons extracted from a gabbro in the San Juan Unit yielded an age of 87.1 ± 0.8. Ma. ...
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.