Geology of the Oregon Coast Itinerary
... Triassic Terrane exposed along I-5. Greenstones abundant, some deeply weathered to reddish soils. (32.8 to 40.0 mi.) • Unconformity between Western Pz-Tr rocks and overlying Hornbrook Formation (40.0 mi.) • Hornbrook Formation – Cretaceous forearc basin sediments, mostly sandstones and shales; conta ...
... Triassic Terrane exposed along I-5. Greenstones abundant, some deeply weathered to reddish soils. (32.8 to 40.0 mi.) • Unconformity between Western Pz-Tr rocks and overlying Hornbrook Formation (40.0 mi.) • Hornbrook Formation – Cretaceous forearc basin sediments, mostly sandstones and shales; conta ...
Revised plate tectonic history of the west Australian
... The Arakan Yoma terrane is an Eocene-uplifted subduction system, formed of Cretaceous to Eocene pelagic sediments. The Central Burma Basin contains a volcanic arc formed from late Mesozoic subduction of oceanic lithosphere. Drag from Greater India caused 425 km northward strike-slip of both terranes ...
... The Arakan Yoma terrane is an Eocene-uplifted subduction system, formed of Cretaceous to Eocene pelagic sediments. The Central Burma Basin contains a volcanic arc formed from late Mesozoic subduction of oceanic lithosphere. Drag from Greater India caused 425 km northward strike-slip of both terranes ...
How Do Earthquakes Tell Us About the Earth`s Interior?
... • When a wave (light, sound, H2O) passes from one material to another, it refracts (bends) or reflects (bounces back) – Waves change speed between mediums – In water, changes occur with depth – In Earth, w/density ...
... • When a wave (light, sound, H2O) passes from one material to another, it refracts (bends) or reflects (bounces back) – Waves change speed between mediums – In water, changes occur with depth – In Earth, w/density ...
IGNEOUS ROCKS
... How does magma form? • Factors that control melting temperatures – Pressure • melting points of minerals increase with pressure – This is why increasing temperature along the geotherm alone fails to melt crustal rocks ...
... How does magma form? • Factors that control melting temperatures – Pressure • melting points of minerals increase with pressure – This is why increasing temperature along the geotherm alone fails to melt crustal rocks ...
IGNEOUS ROCK - CoconinoHighSchool
... When magmas reach the surface of the Earth they erupt from a vent. They may erupt explosively or non-explosively. Non-explosive eruptions are favored by low gas content and low viscosity magmas (basaltic to andesitic magmas). Usually begin with fire fountains due to release of dissolved gases ...
... When magmas reach the surface of the Earth they erupt from a vent. They may erupt explosively or non-explosively. Non-explosive eruptions are favored by low gas content and low viscosity magmas (basaltic to andesitic magmas). Usually begin with fire fountains due to release of dissolved gases ...
chapter 6 Metamorphic Rks.pptx
... metamorphism & mineral assemblage – Low-grade metamorphism- 200 to 350 OC and relatively low pressures – Intermediate-grade metamorphism - 350 to 550 OC and moderate to high pressures – High-grade metamorphism - very high temperatures, usually above 550OC and/or very high pressures ...
... metamorphism & mineral assemblage – Low-grade metamorphism- 200 to 350 OC and relatively low pressures – Intermediate-grade metamorphism - 350 to 550 OC and moderate to high pressures – High-grade metamorphism - very high temperatures, usually above 550OC and/or very high pressures ...
Opportunities to investigate early-stage rifting with
... rifted margins selected as ‘primary’ GEOPRISMS sites. Rifts along the Western Branch of the EAR constitute examples of rifting in strong, cold lithosphere at low strain rates. Basins in the Western Branch contain extensive syn-rift sedimentary sequences that record at exceptionally high temporal res ...
... rifted margins selected as ‘primary’ GEOPRISMS sites. Rifts along the Western Branch of the EAR constitute examples of rifting in strong, cold lithosphere at low strain rates. Basins in the Western Branch contain extensive syn-rift sedimentary sequences that record at exceptionally high temporal res ...
Modelling the initiation of sea floor spreading and formation of rifted
... predict the divergent motion of the asthenosphere and lithosphere matrix, and the focusing of basaltic melt into the narrow axial zone spreading centre at ocean ridges. We are adapting two-phase flow models for application to the initiation of sea-floor spreading and rifted continental margin format ...
... predict the divergent motion of the asthenosphere and lithosphere matrix, and the focusing of basaltic melt into the narrow axial zone spreading centre at ocean ridges. We are adapting two-phase flow models for application to the initiation of sea-floor spreading and rifted continental margin format ...
Plate Tectonics
... You have just learned about several ways the Earth’s crust changes because of the forces of plate tectonics. When tectonic plates collide, land features that start as folds and faults can eventually become large mountain ranges. Mountains exist because tectonic plates are continually moving around a ...
... You have just learned about several ways the Earth’s crust changes because of the forces of plate tectonics. When tectonic plates collide, land features that start as folds and faults can eventually become large mountain ranges. Mountains exist because tectonic plates are continually moving around a ...
the geosphere - Blinklearning
... The geosphere is the solid layer of the Earth, which, in turn, is divided in three layers that are separated by areas known as discontinuities. The deeper a layer is the more density and temperature it presents. The crust · Continental crust: it forms the continental platform, continents and is comp ...
... The geosphere is the solid layer of the Earth, which, in turn, is divided in three layers that are separated by areas known as discontinuities. The deeper a layer is the more density and temperature it presents. The crust · Continental crust: it forms the continental platform, continents and is comp ...
Earthquakes
... There is some relationship between earthquakes and volcanoes. ► They are both caused by the tectonic plates shifting. ► However, they tend not to occur in the same areas. For example, there is a volcano in Antarctica. No earthquakes occurred in Antarctica during my research. ...
... There is some relationship between earthquakes and volcanoes. ► They are both caused by the tectonic plates shifting. ► However, they tend not to occur in the same areas. For example, there is a volcano in Antarctica. No earthquakes occurred in Antarctica during my research. ...
Chapter 12 Earthquakes and Volcanism Plate Tectonics
... Earth’s Surface Relief Features Cratons and Continental Shields Craton – Continental nucleus of ancient crystalline rock on which the continent grows with the addition of crustal fragments and sediments. A continental shield occurs where a craton is exposed at the surface. ...
... Earth’s Surface Relief Features Cratons and Continental Shields Craton – Continental nucleus of ancient crystalline rock on which the continent grows with the addition of crustal fragments and sediments. A continental shield occurs where a craton is exposed at the surface. ...
Chapter 7 Directed Reading B
... 15. When a______________________ fault moves, the hanging wall moves up relative to the footwall. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. ...
... 15. When a______________________ fault moves, the hanging wall moves up relative to the footwall. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. ...
The Earth`s Interior
... Implications of shallow P range from major element data: MORB magmas = product of partial melting of mantle lherzolite in a rising solid diapir Melting must take place over a range of pressures The pressure of multiple saturation represents the point at which the melt was last in equilibrium with ...
... Implications of shallow P range from major element data: MORB magmas = product of partial melting of mantle lherzolite in a rising solid diapir Melting must take place over a range of pressures The pressure of multiple saturation represents the point at which the melt was last in equilibrium with ...
Field Guide Local Geology Review
... Melanges are common in the Northern California coast ranges: recognized by large random boulders sitting on rolling hillsides. Boulders are hard and stand out from the soft greenish-gray or bluish-gray clay matrix, which is seldom seen. The clay matrix does not have layering. Melanges form because i ...
... Melanges are common in the Northern California coast ranges: recognized by large random boulders sitting on rolling hillsides. Boulders are hard and stand out from the soft greenish-gray or bluish-gray clay matrix, which is seldom seen. The clay matrix does not have layering. Melanges form because i ...
knockvologan to eilean a`chalmain
... within this GCR site is considerable. The basic enclaves range in size from a few centimetres to several hundreds of metres and the largest discrete mass of basic rock comprises most of Eilean a' Chalmain. Rocks within this outcrop are heterogeneous, ranging from medium-grained diorite to coarse-gra ...
... within this GCR site is considerable. The basic enclaves range in size from a few centimetres to several hundreds of metres and the largest discrete mass of basic rock comprises most of Eilean a' Chalmain. Rocks within this outcrop are heterogeneous, ranging from medium-grained diorite to coarse-gra ...
Continental collision and the tectono-sedimentary
... the interactions between colliding continental lithospheric plates. Already from the initial stages it was recognized that only an approach able to integrate the three components of the system, namely the orogen, the foredeep and the foreland, could cover the entire width of the topic. A very import ...
... the interactions between colliding continental lithospheric plates. Already from the initial stages it was recognized that only an approach able to integrate the three components of the system, namely the orogen, the foredeep and the foreland, could cover the entire width of the topic. A very import ...
Deep ocean floor sediment
... 5) Main Boundary Thrust: Separating the Siwalik Formations of the Sub-Himalayas from the older rocks lying to their north. It is a major structural plane discernible throughout the length of the Himalayas 6 ) Accretionary wedge or accretionary prism: Formed from sediments that are accreted onto the ...
... 5) Main Boundary Thrust: Separating the Siwalik Formations of the Sub-Himalayas from the older rocks lying to their north. It is a major structural plane discernible throughout the length of the Himalayas 6 ) Accretionary wedge or accretionary prism: Formed from sediments that are accreted onto the ...
Eastern Klamath Mountains - College of the Siskiyous
... lithosphere apart beneath an oceanic arc and enable rising asthenospheric and subduction-generated magmas to widen and thicken the lithosphere. The Trinity ophiolite of the Eastern Klamath Mountains is interpreted as such a supra-subduction zone ophiolite (Fig. 5) on the basis of its rock compositio ...
... lithosphere apart beneath an oceanic arc and enable rising asthenospheric and subduction-generated magmas to widen and thicken the lithosphere. The Trinity ophiolite of the Eastern Klamath Mountains is interpreted as such a supra-subduction zone ophiolite (Fig. 5) on the basis of its rock compositio ...
Curriculum Vitae CHERYL WATERS
... Burnsville fault: Evidence for the timing and kinematics of Acadian dextral transform tectonics in the southern Appalachians. Geological Society of America Bulletin 115, 13651376. Waters, C., Tikoff, B., Goodwin, L.B., Little, T.A., 2002. Ductile instabilities and structural heterogeneity in the low ...
... Burnsville fault: Evidence for the timing and kinematics of Acadian dextral transform tectonics in the southern Appalachians. Geological Society of America Bulletin 115, 13651376. Waters, C., Tikoff, B., Goodwin, L.B., Little, T.A., 2002. Ductile instabilities and structural heterogeneity in the low ...
Rock Identification Lab
... type of metamorphism occurs during the processes associated with mountain building. Mountains are formed when two plates collide. This type of collision produces a tremendous amount of heat and pressure. This heat and pressure causes distortion and the rearrangement of minerals in a rock. As a resul ...
... type of metamorphism occurs during the processes associated with mountain building. Mountains are formed when two plates collide. This type of collision produces a tremendous amount of heat and pressure. This heat and pressure causes distortion and the rearrangement of minerals in a rock. As a resul ...
Igneous Rock Classification.
... controls the mineralogy. Thus, mafic rocks, rich in Mg+Fe, have a higher proportion of mafic minerals, which are typically dark, whereas felsic rocks are low in Mg+Fe, and are therefore typically much lighter in colour, being dominated by quartz and feldspars. This gives rise to the concept of Colou ...
... controls the mineralogy. Thus, mafic rocks, rich in Mg+Fe, have a higher proportion of mafic minerals, which are typically dark, whereas felsic rocks are low in Mg+Fe, and are therefore typically much lighter in colour, being dominated by quartz and feldspars. This gives rise to the concept of Colou ...
Earth Through Time Summary Tracking Plate Motions
... California to Alaska and from coast to Wyoming and Montana is an accreted terrane margin. ...
... California to Alaska and from coast to Wyoming and Montana is an accreted terrane margin. ...
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.