cos.anu.edu.au • Boxing clever • When push comes to shove
... sinking oceanic plate as it subducts, known as slab pull, drags the trailing plate behind causing rifting between two plates. Old crust is subducted while new crust is formed at these spreading centres. Subduction zones are where most of the worlds volcanoes and earthquakes are located so understand ...
... sinking oceanic plate as it subducts, known as slab pull, drags the trailing plate behind causing rifting between two plates. Old crust is subducted while new crust is formed at these spreading centres. Subduction zones are where most of the worlds volcanoes and earthquakes are located so understand ...
IGNEOUS ROCKS
... – DIKE• If no layering in country rock • If country rock is layered- Discordant – SILL- less common • Concordant- parallel to layering in country rock Pluton BATHOLITH– Large intrusive body – Exposed in an area greater than 100 square Km. – Coalesced smaller plutons smaller bodies are called STOCKS ...
... – DIKE• If no layering in country rock • If country rock is layered- Discordant – SILL- less common • Concordant- parallel to layering in country rock Pluton BATHOLITH– Large intrusive body – Exposed in an area greater than 100 square Km. – Coalesced smaller plutons smaller bodies are called STOCKS ...
Natural Hazards - Geology 209 Homework assignment #3
... Use these values to plot plate velocity vectors on the world map attached to this problem set. To do this you will need a protractor - if you need to borrow one please come see me, but I am sure you can get one from a friend. Velocity vectors represent the direction and magnitude of plate motion. To ...
... Use these values to plot plate velocity vectors on the world map attached to this problem set. To do this you will need a protractor - if you need to borrow one please come see me, but I am sure you can get one from a friend. Velocity vectors represent the direction and magnitude of plate motion. To ...
A density model of the Andean subduction zone
... zolite with an average density of 3.34 g/cm3. The boundary of the asthenosphere with the Nazca Plate near the western coast of South America is not imaged seismically, probably a result of the similar densities and velocities. The most active area of continental and oceanic plate contact is consider ...
... zolite with an average density of 3.34 g/cm3. The boundary of the asthenosphere with the Nazca Plate near the western coast of South America is not imaged seismically, probably a result of the similar densities and velocities. The most active area of continental and oceanic plate contact is consider ...
Introducción a la Geofísica ( )
... (b) Discuss in your own words the information that these data give about the deep interior of the Earth. The Earth’s shell-like internal structure of mantle, fluid outer core, and solid inner core are evident from the velocities and elastic parameters ratios. The inner core is solid, but the high v ...
... (b) Discuss in your own words the information that these data give about the deep interior of the Earth. The Earth’s shell-like internal structure of mantle, fluid outer core, and solid inner core are evident from the velocities and elastic parameters ratios. The inner core is solid, but the high v ...
Volcanism I
... From hydrated minerals e.g. mica at 100km From decomposition of marine limestones Causes mantle melting – leads to island arc basalts ...
... From hydrated minerals e.g. mica at 100km From decomposition of marine limestones Causes mantle melting – leads to island arc basalts ...
Unit 5: Ocean Floor Structure and Plate Tectonics
... floor. Remember, however, that this is just an overall view of what exists. Continental Shelves – zones adjacent to a continent (or around an island) and extending from the low-water line to the depth, usually about 120 m, where there is a marked or rather steep descent toward great depths. The volu ...
... floor. Remember, however, that this is just an overall view of what exists. Continental Shelves – zones adjacent to a continent (or around an island) and extending from the low-water line to the depth, usually about 120 m, where there is a marked or rather steep descent toward great depths. The volu ...
Detection of subducted crustal material in the mid
... Figure 4: Depth slices through the tomography model by Ritsema and van Heijst [2002] (A) and Karason and van der Hilst [2001] (B). Each depth slice also includes the detected scatterers (reflectors) marked as crosses for the appropriate depth. The scatterer locations at depths larger than 400 km sho ...
... Figure 4: Depth slices through the tomography model by Ritsema and van Heijst [2002] (A) and Karason and van der Hilst [2001] (B). Each depth slice also includes the detected scatterers (reflectors) marked as crosses for the appropriate depth. The scatterer locations at depths larger than 400 km sho ...
Theory of Plate Tectonics IV
... The decending oceanic slab generates either a volcanic arc (on one of the continents) or an island arc (at some distance into the ocean). Erosion of newly formed volcanic rocks adds sediment to the continental margins. ...
... The decending oceanic slab generates either a volcanic arc (on one of the continents) or an island arc (at some distance into the ocean). Erosion of newly formed volcanic rocks adds sediment to the continental margins. ...
Word - Manchester Geological Association
... anywhere in the world. It has been the subject of intensive field, geophysical and geochemical investigations for over 30 years with work by major groups from the USGS, University of Montpelier in France, the Open University and Cardiff University in the UK, and more recently groups from Japan and G ...
... anywhere in the world. It has been the subject of intensive field, geophysical and geochemical investigations for over 30 years with work by major groups from the USGS, University of Montpelier in France, the Open University and Cardiff University in the UK, and more recently groups from Japan and G ...
THE EARTH`S STRUCTURE
... below the crust (84% of the earth’s volume). The core contains more than 15% of the earth’s volume. Many geologists are unwilling to guess what the core is made of, but they think it must be very hot and dense. ...
... below the crust (84% of the earth’s volume). The core contains more than 15% of the earth’s volume. Many geologists are unwilling to guess what the core is made of, but they think it must be very hot and dense. ...
Melting under the Colorado Plateau, USA
... Usui et al., 2006). The range in coupled Hf-Nd isotope characteristics of CP lavas could alternatively reflect aging of melt-metasomatized mantle since the Proterozoic. Ratios between Zn and Fe provide a promising means of identifying whether olivine-poor lithologies, including sediments, are respon ...
... Usui et al., 2006). The range in coupled Hf-Nd isotope characteristics of CP lavas could alternatively reflect aging of melt-metasomatized mantle since the Proterozoic. Ratios between Zn and Fe provide a promising means of identifying whether olivine-poor lithologies, including sediments, are respon ...
Divergent Plate Boundaries
... Magma rises, cools and forms new lithosphere Typically expressed as mid-oceanic ridges ...
... Magma rises, cools and forms new lithosphere Typically expressed as mid-oceanic ridges ...
The spatial extent and characteristics of block fields in Alpine areas
... melts mainly reflects the enriched character of the metasomatized hydrous vein used as starting material (this enriched character is a universally observed feature of such hydrous veins). Experiments using a layer of hornblendite sandwiched between two layers of moderately depleted peridotite were p ...
... melts mainly reflects the enriched character of the metasomatized hydrous vein used as starting material (this enriched character is a universally observed feature of such hydrous veins). Experiments using a layer of hornblendite sandwiched between two layers of moderately depleted peridotite were p ...
heat and convection in the earth
... Generally good agreement between expected heat production from chondrite model and that calculated for Earth, given uncertainty of role of core. This suggests possible lost K in core?? Thus heat production in Earth is approximately explained by chondritic Earth model (in detail other problems to wor ...
... Generally good agreement between expected heat production from chondrite model and that calculated for Earth, given uncertainty of role of core. This suggests possible lost K in core?? Thus heat production in Earth is approximately explained by chondritic Earth model (in detail other problems to wor ...
Crust and Upper Mantle Structure in Northeast of Tibet from
... Continental rifting and the subsequent development of new oceanic crust involve the complex interaction of tectonic, magmatic and geodynamic processes that results in a variety of passive margin styles. Based upon the amount of volcanism that occurs, passive margins may be classified as volcanic or ...
... Continental rifting and the subsequent development of new oceanic crust involve the complex interaction of tectonic, magmatic and geodynamic processes that results in a variety of passive margin styles. Based upon the amount of volcanism that occurs, passive margins may be classified as volcanic or ...
The Planet Oceanus
... The cool, rigid outer layer Hot, partially melted layer which flows slowly Denser and more slowly flowing than the asthenosphere Dense, viscous liquid layer, extremely hot Solid, very dense and extremely hot ...
... The cool, rigid outer layer Hot, partially melted layer which flows slowly Denser and more slowly flowing than the asthenosphere Dense, viscous liquid layer, extremely hot Solid, very dense and extremely hot ...
Earth Processes
... that states that continents are not stationary but actually move very, very slowly across the face of the Earth. theory of plate tectonics A theory that states that the crust is made up of plates that float on the mantle and are carried by convection currents in the mantle. tracing The squiggly line ...
... that states that continents are not stationary but actually move very, very slowly across the face of the Earth. theory of plate tectonics A theory that states that the crust is made up of plates that float on the mantle and are carried by convection currents in the mantle. tracing The squiggly line ...
Earth`s Composition
... really easy to bend, and the silly putty will take the shape of its container over time. Because of this property, the asthenosphere is classified differently than the lithosphere. The lower mantle is also known as the mesophere. The average temperature of this layer is about 2000ºC. It is the botto ...
... really easy to bend, and the silly putty will take the shape of its container over time. Because of this property, the asthenosphere is classified differently than the lithosphere. The lower mantle is also known as the mesophere. The average temperature of this layer is about 2000ºC. It is the botto ...
Introduction to Earthquakes EASA
... Earth is cooling over time because it is much warmer than the surrounding vacuum of space. (2)Heat generally “moves” from hotter objects or regions to cooler objects or regions. (3)The “movement” of heat is generally called ...
... Earth is cooling over time because it is much warmer than the surrounding vacuum of space. (2)Heat generally “moves” from hotter objects or regions to cooler objects or regions. (3)The “movement” of heat is generally called ...
Ch 3 ppt
... moves up within the crust and eventually erupts forming a continental volcanic arc. Example: Cascades (Oregon & Washington State, U.S.) ...
... moves up within the crust and eventually erupts forming a continental volcanic arc. Example: Cascades (Oregon & Washington State, U.S.) ...
Mantle plume
A mantle plume is a mechanism proposed in 1971 to explain volcanic regions of the earth that were not thought to be explicable by the then-new theory of plate tectonics. Some such volcanic regions lie far from tectonic plate boundaries, for example, Hawaii. Others represent unusually large-volume volcanism, whether on plate boundaries, e.g. Iceland, or basalt floods such as the Deccan or Siberian traps.A mantle plume is posited to exist where hot rock nucleates at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. The currently active volcanic centers are known as ""hot spots"". In particular, the concept that mantle plumes are fixed relative to one another, and anchored at the core-mantle boundary, was thought to provide a natural explanation for the time-progressive chains of older volcanoes seen extending out from some such hot spots, such as the Hawaiian–Emperor seamount chain.The hypothesis of mantle plumes from depth is not universally accepted as explaining all such volcanism. It has required progressive hypothesis-elaboration leading to variant propositions such as mini-plumes and pulsing plumes. Another hypothesis for unusual volcanic regions is the ""Plate model"". This proposes shallower, passive leakage of magma from the mantle onto the Earth's surface where extension of the lithosphere permits it, attributing most volcanism to plate tectonic processes, with volcanoes far from plate boundaries resulting from intraplate extension.