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Plate Tectonics - BYU
... The hypothesis of continental drift would become the spark that ignited a new way of viewing the Earth. But at the time Wegener introduced his ideas and evidence, the scientific community firmly believed the continents and oceans to be permanent features on the Earth's surface. Not surprisingly, hi ...
... The hypothesis of continental drift would become the spark that ignited a new way of viewing the Earth. But at the time Wegener introduced his ideas and evidence, the scientific community firmly believed the continents and oceans to be permanent features on the Earth's surface. Not surprisingly, hi ...
Tectonic Earthquakes of the Pacific Northwest The Pacific Northwest
... the subduction zone is locked and elastic energy builds.we expect to see deformation of the continental margin, as shown by these yellow arrows, However, this deformation is reversible because the edge of the North American Plate jumps back to the west during each great earthquake before it locks ag ...
... the subduction zone is locked and elastic energy builds.we expect to see deformation of the continental margin, as shown by these yellow arrows, However, this deformation is reversible because the edge of the North American Plate jumps back to the west during each great earthquake before it locks ag ...
here - GeoCoops
... 10. The sinking lead edge of the oceanic plate actually “pulls” the rest of the plate behind it— evidence suggests this is the main driving force of subduction. Geologists are not sure how deep the oceanic plate sinks before it begins to melt and lose its identity as a rigid slab, but we do know tha ...
... 10. The sinking lead edge of the oceanic plate actually “pulls” the rest of the plate behind it— evidence suggests this is the main driving force of subduction. Geologists are not sure how deep the oceanic plate sinks before it begins to melt and lose its identity as a rigid slab, but we do know tha ...
7. Geology of the Jan Mayen area (extended abstract)
... the eastern slopes of the Jan Mayen ridge, which at this stage was still attached to the continent of Greenland. This formed dipping reflectors as the oceanic crust thickened. At 45-50 million years ago the lavas no longer managed to flow over the Jan Mayen ridge and the older lavas were covered wit ...
... the eastern slopes of the Jan Mayen ridge, which at this stage was still attached to the continent of Greenland. This formed dipping reflectors as the oceanic crust thickened. At 45-50 million years ago the lavas no longer managed to flow over the Jan Mayen ridge and the older lavas were covered wit ...
Top driven asymmetric mantle convection
... km3/yr (±15). Mass balance predicts that slabs are compensated by broad passive upwellings beneath oceans, mainly at oceanic ridges and backarc basins. These may correspond to the broad low wavespeed regions found in the upper mantle by tomography. However, W-directed slabs enter the mantle more tha ...
... km3/yr (±15). Mass balance predicts that slabs are compensated by broad passive upwellings beneath oceans, mainly at oceanic ridges and backarc basins. These may correspond to the broad low wavespeed regions found in the upper mantle by tomography. However, W-directed slabs enter the mantle more tha ...
Review of Late Jurassic-early Miocene sedimentation and plate
... and continuing to *150-140 Ma, erosion supplied volcanogenic debris to proximal Mariposa-Galice ± Myrtle overlap strata. (4) At *140, immediately prior to the onset of paired Franciscan and Great Valley Group (GVG) ? Hornbrook deposition, the Klamath salient was deformed and displaced *100–150 km we ...
... and continuing to *150-140 Ma, erosion supplied volcanogenic debris to proximal Mariposa-Galice ± Myrtle overlap strata. (4) At *140, immediately prior to the onset of paired Franciscan and Great Valley Group (GVG) ? Hornbrook deposition, the Klamath salient was deformed and displaced *100–150 km we ...
EOCENE TECTONIC EVOLUTION OF NW MEXICO (SONORA and
... plates underwent a general reorganisation. This is attested, for instance, by the following events of that time: the main phase of the Alpine Orogeny, one of the main phases of the Andean Orogeny, the opening of several marginal seas in Eastern Asia, the change of direction of the movement of the Pa ...
... plates underwent a general reorganisation. This is attested, for instance, by the following events of that time: the main phase of the Alpine Orogeny, one of the main phases of the Andean Orogeny, the opening of several marginal seas in Eastern Asia, the change of direction of the movement of the Pa ...
Flood basalts, continental breakup and the dispersal of
... Abstract. The present study used igneous provinces, mainly continental flood volcanics or oceanic plateaus, at times associated with regional updoming, major rifting and continental breakup, together with its precisely dated magmatic events, as indications for paths of plume activity. First-generati ...
... Abstract. The present study used igneous provinces, mainly continental flood volcanics or oceanic plateaus, at times associated with regional updoming, major rifting and continental breakup, together with its precisely dated magmatic events, as indications for paths of plume activity. First-generati ...
Summary Table for Three Types of Plate Boundaries
... Continental Plate Oceanic Plate Continental Plate plate Younger, dense Plates fold upward and continent moves over plate plate moves over plate thickens plate is forced , more dense plates are into the mantle in the plate is subducted too light to be subducted subduction zone Volcanoes form island a ...
... Continental Plate Oceanic Plate Continental Plate plate Younger, dense Plates fold upward and continent moves over plate plate moves over plate thickens plate is forced , more dense plates are into the mantle in the plate is subducted too light to be subducted subduction zone Volcanoes form island a ...
June 2006 in Valdez, Alaska
... basaltic microstructures and infer wave speeds and yield stress. Thierry Menand presented an analog model of sill injection into the crust, concluding that rigidity contrasts may play a major role in the location and geometry of sills and the development of igneous complexes. George Bergantz assesse ...
... basaltic microstructures and infer wave speeds and yield stress. Thierry Menand presented an analog model of sill injection into the crust, concluding that rigidity contrasts may play a major role in the location and geometry of sills and the development of igneous complexes. George Bergantz assesse ...
Relationship between tectonic evolution and hydrocarbon in the
... the Presinian basements or deep metamorphic rocks to overlap onto the nonmetamorphic rocks. The metamorphic rocks are called Pengguan, Baoxing and Jiaoziding complexes (about 700-1000 Ma), corresponding to the upper part of the basement of the Sichuan basin. They consist of the Huanshuihe Formation ...
... the Presinian basements or deep metamorphic rocks to overlap onto the nonmetamorphic rocks. The metamorphic rocks are called Pengguan, Baoxing and Jiaoziding complexes (about 700-1000 Ma), corresponding to the upper part of the basement of the Sichuan basin. They consist of the Huanshuihe Formation ...
The Task
... Seafloor spreading: summarize how Seafloor Spreading creates new crust and select appropriate media on Discoveryeducation.com to accompany that summary. Where does seafloor spreading occur (at what type of plate boundary?) How is new crust made? How do scientists study seafloor spreading? Hist ...
... Seafloor spreading: summarize how Seafloor Spreading creates new crust and select appropriate media on Discoveryeducation.com to accompany that summary. Where does seafloor spreading occur (at what type of plate boundary?) How is new crust made? How do scientists study seafloor spreading? Hist ...
Thermal Structure and Metamorphic Evolution of Subducting Slabs
... lavas (e.g., large-ion lithophile elements, B, Be) appear to be derived from the subducting slab [e.g., Gill, 1981; Hawkesworth et al., 1993; Davidson, 1996]. Most of these elements are readily transported in aqueous fluids, but recent experimental data suggest that the efficient transport of Be and ...
... lavas (e.g., large-ion lithophile elements, B, Be) appear to be derived from the subducting slab [e.g., Gill, 1981; Hawkesworth et al., 1993; Davidson, 1996]. Most of these elements are readily transported in aqueous fluids, but recent experimental data suggest that the efficient transport of Be and ...
Recycling lower continental crust in the North China craton
... observation. Thus, the lavas may have originated as melts of either subducted oceanic crust or foundered lower crust with subsequent interaction of the melts with mantle peridotite. Indeed, the observed increase of Mg#, Ni and Cr of the melt (recorded in the orthopyroxene phenocrysts), together with ...
... observation. Thus, the lavas may have originated as melts of either subducted oceanic crust or foundered lower crust with subsequent interaction of the melts with mantle peridotite. Indeed, the observed increase of Mg#, Ni and Cr of the melt (recorded in the orthopyroxene phenocrysts), together with ...
Deep Sea Drilling Project Initial Reports Volume 80
... seismic velocities range between 6.4 and 6.7 km/s are characterized by gravity and magnetic highs. On the outer part of the shelf, concentric ridges, characterized by the same gravity and magnetic highs, were reactivated in Mesozoic time, and now form the cores of horsts which probably controlled Me ...
... seismic velocities range between 6.4 and 6.7 km/s are characterized by gravity and magnetic highs. On the outer part of the shelf, concentric ridges, characterized by the same gravity and magnetic highs, were reactivated in Mesozoic time, and now form the cores of horsts which probably controlled Me ...
Voyager
... waves. The instruments are connected to buoys at the surface that relay information to satellites. When a tsunami is detected, a warning is sent through an emergency network. The network must then pass this information along to people who are in danger, something that took too long during the recent ...
... waves. The instruments are connected to buoys at the surface that relay information to satellites. When a tsunami is detected, a warning is sent through an emergency network. The network must then pass this information along to people who are in danger, something that took too long during the recent ...
Yogo_et_al._Slab Edg.. - UNC
... been recognized in the Aleutian islands, Baja California, Patagonia and elsewhere2±4. The geochemically distinctive rocks from these areas, termed `adakites', are often associated with subducting plates that are young and warm, and therefore thought to be more prone to melting5. But the subducting l ...
... been recognized in the Aleutian islands, Baja California, Patagonia and elsewhere2±4. The geochemically distinctive rocks from these areas, termed `adakites', are often associated with subducting plates that are young and warm, and therefore thought to be more prone to melting5. But the subducting l ...
High pore pressures and porosity at 35 km depth in the Cascadia
... LABORATORY EXPERIMENTAL DATA The observed Vp/Vs values of 2.35 ± 0.10 beneath southern Vancouver Island are higher than all laboratory Vp/Vs measurements made on an extensive range of rock types at a confining pressure of 1 GPa (Fig. 3A). The rocks measured in the laboratory span a wide range of sil ...
... LABORATORY EXPERIMENTAL DATA The observed Vp/Vs values of 2.35 ± 0.10 beneath southern Vancouver Island are higher than all laboratory Vp/Vs measurements made on an extensive range of rock types at a confining pressure of 1 GPa (Fig. 3A). The rocks measured in the laboratory span a wide range of sil ...
Nevado de Longaví Volcano (Chilean Andes, 36.2 ˚S): adakitic
... The formation of adakites by partial melting of oceanic lithosphere is limited to regions where young, hot slabs are subducted. Adakitic melts also occur in continental arcs related to subduction of cold oceanic lithosphere, where they have been explained in terms of remelting of basaltic material u ...
... The formation of adakites by partial melting of oceanic lithosphere is limited to regions where young, hot slabs are subducted. Adakitic melts also occur in continental arcs related to subduction of cold oceanic lithosphere, where they have been explained in terms of remelting of basaltic material u ...
Long-term continental areal reduction produced by tectonic processes
... either through back-arc extension or plate-creation, approximately 94% is eventually destroyed through areal removal at subduction zones. The remaining 6% is taken up through deformation of continental crust. We found the total area produced at oceanic ridges and extending back-arc basins to be appr ...
... either through back-arc extension or plate-creation, approximately 94% is eventually destroyed through areal removal at subduction zones. The remaining 6% is taken up through deformation of continental crust. We found the total area produced at oceanic ridges and extending back-arc basins to be appr ...
Abstract
... is indicative of north-verging tectonic transport, overprinted by a fabric associated with regional shear zones with a south-verging sense of transport. Late normal and strike-slip faults are present in the Aileu Complex. It is proposed here that the Aileu Complex experienced early thickening during ...
... is indicative of north-verging tectonic transport, overprinted by a fabric associated with regional shear zones with a south-verging sense of transport. Late normal and strike-slip faults are present in the Aileu Complex. It is proposed here that the Aileu Complex experienced early thickening during ...
Calculation of Appalachian Erosion
... Besides a crude estimate for the amount of erosion that is based on coal rank (see Chapter 8), there is another method for estimating erosion from the Appalachians. This method estimates the amount of sediments and sedimentary rocks offshore, which mainly eroded from the Appalachians.3 The continent ...
... Besides a crude estimate for the amount of erosion that is based on coal rank (see Chapter 8), there is another method for estimating erosion from the Appalachians. This method estimates the amount of sediments and sedimentary rocks offshore, which mainly eroded from the Appalachians.3 The continent ...
Edmond and Huh 2003 - Department of the Geophysical Sciences
... relative to the rate of fixation by weathering, mechanisms that maintain this apparently precarious balance dominate current thinking. At present, the Atlantic and Indian oceans are major depocenters of CaCO3 , but subduction of ocean floor and the deposits on it is minimal in these basins. The locu ...
... relative to the rate of fixation by weathering, mechanisms that maintain this apparently precarious balance dominate current thinking. At present, the Atlantic and Indian oceans are major depocenters of CaCO3 , but subduction of ocean floor and the deposits on it is minimal in these basins. The locu ...
between Earth Expansion and Seafloor Spreading
... resumed on the planetary scale (with only local drift) during the late Oligocene to early Miocene, and has increased (with quiescent intervals of widespread synchroneity) until the Pleistocene at least. (120-121) ...
... resumed on the planetary scale (with only local drift) during the late Oligocene to early Miocene, and has increased (with quiescent intervals of widespread synchroneity) until the Pleistocene at least. (120-121) ...
the caribbean plate and the question of its formation
... Western Cordillera oceanic complex with the Central Cordillera of Colombia. The result was this major fault dividing two distinct geological provinces. The eastern part is made of Precambrian to Cenozoic continental rocks of the Cordillera Central and the Santa Marta Massif, but the western part con ...
... Western Cordillera oceanic complex with the Central Cordillera of Colombia. The result was this major fault dividing two distinct geological provinces. The eastern part is made of Precambrian to Cenozoic continental rocks of the Cordillera Central and the Santa Marta Massif, but the western part con ...