Lecture 23 - Igneous Rocks
... Vesicular - contains tiny holes called vesicles which formed due to gas bubbles in the lava or magma. Very porous. May resemble a sponge. Commonly low density; may float on water. Vesicular Basalt, Pumice, Scoria Pyroclastic or Fragmental - pieces of rock and ash come out of a volcano and get weld ...
... Vesicular - contains tiny holes called vesicles which formed due to gas bubbles in the lava or magma. Very porous. May resemble a sponge. Commonly low density; may float on water. Vesicular Basalt, Pumice, Scoria Pyroclastic or Fragmental - pieces of rock and ash come out of a volcano and get weld ...
Geology of Paraná
... reflects how resistant to weathering its rocks are. From the Devonian scarp known as São Luiz do Purunã to the western border of the state, the Paraná Shield is overlain by the PARANÁ BASIN, a massive sequence of sedimentary and volcanic rocks of Silurian to Cretaceous age that sustains the state's ...
... reflects how resistant to weathering its rocks are. From the Devonian scarp known as São Luiz do Purunã to the western border of the state, the Paraná Shield is overlain by the PARANÁ BASIN, a massive sequence of sedimentary and volcanic rocks of Silurian to Cretaceous age that sustains the state's ...
magnetostratigraphy
... Magnetostratigraphy: uses records of changes in polarity of the geomagnetic field preserved in sedimentary sequences to correlate between wells and to date the sediment. Individual normal and reverse polarity intervals ("Chrons") typically range from ~10 thousand to 10 million years in duration. ...
... Magnetostratigraphy: uses records of changes in polarity of the geomagnetic field preserved in sedimentary sequences to correlate between wells and to date the sediment. Individual normal and reverse polarity intervals ("Chrons") typically range from ~10 thousand to 10 million years in duration. ...
Ch.4 Notes
... • Lithosphere – upper mantle • Asthenosphere – solid rock that is under pressure • 30 different plates ...
... • Lithosphere – upper mantle • Asthenosphere – solid rock that is under pressure • 30 different plates ...
Exogenous Forces and Weathering
... earth. Thee features have been shaped by natural forces active on our planet. Geologists tell us that these forces not only shape the surface, but are also in continual conflict with each other. The forces of weather, waves, rivers, and glaciers are in continual battle with the rocks of the earth’s ...
... earth. Thee features have been shaped by natural forces active on our planet. Geologists tell us that these forces not only shape the surface, but are also in continual conflict with each other. The forces of weather, waves, rivers, and glaciers are in continual battle with the rocks of the earth’s ...
Quake Study sees Possible Fault with New Madrid`s
... hypothetical weak spot underground could cause the fault to rupture again - possibly with a force as great as the last series of major quakes in 1811 and 1812. A study last year by Northwestern University researchers concluded that the danger of a big earthquake along the fault is small because sate ...
... hypothetical weak spot underground could cause the fault to rupture again - possibly with a force as great as the last series of major quakes in 1811 and 1812. A study last year by Northwestern University researchers concluded that the danger of a big earthquake along the fault is small because sate ...
Weathering and Erosion
... To reduce soil erosion from water, wind, and rain, farmers often plant trees, crops, or grass. The roots of the plant help hold the soil together against wind and rain. Farmers also plow the land on hills in horizontal rows to prevent fast-running rain water from falling straight downwards and wash ...
... To reduce soil erosion from water, wind, and rain, farmers often plant trees, crops, or grass. The roots of the plant help hold the soil together against wind and rain. Farmers also plow the land on hills in horizontal rows to prevent fast-running rain water from falling straight downwards and wash ...
File - tallisA2units
... common. The lava itself is typically intermediate or silicic, with more than 50% silica content. This, allied to a lower temperature of about 800°C, makes it much thicker and more viscous. It flows slowly and cools quickly, giving rise to a cone with a narrow base and a greater height. Sometimes the ...
... common. The lava itself is typically intermediate or silicic, with more than 50% silica content. This, allied to a lower temperature of about 800°C, makes it much thicker and more viscous. It flows slowly and cools quickly, giving rise to a cone with a narrow base and a greater height. Sometimes the ...
Geology of Dubbo - Dubbo Field Nats Home
... the Toongi Group, has a maximum thickness of 5500 metres. The greywackes are quartz-rich in the lower part but near the top they contain fragments of rhyolite and andesite. Evidence of volcanism is found throughout the section. On the Molong Rise, the Lower Devonian Garra Formation, a 900-1200 metre ...
... the Toongi Group, has a maximum thickness of 5500 metres. The greywackes are quartz-rich in the lower part but near the top they contain fragments of rhyolite and andesite. Evidence of volcanism is found throughout the section. On the Molong Rise, the Lower Devonian Garra Formation, a 900-1200 metre ...
Science 3360 - Kennesaw State University | College of Science and
... The crust and upper mantle form 2 distinct regions: • The Lithosphere (comprising the first 70 - 125 km of the solid earth) consists of the oceanic and continental crustal material plus the uppermost portion of the mantle. It is rigid and acts as a single unit. • the Asthenosphere ( ~ 100’s km in de ...
... The crust and upper mantle form 2 distinct regions: • The Lithosphere (comprising the first 70 - 125 km of the solid earth) consists of the oceanic and continental crustal material plus the uppermost portion of the mantle. It is rigid and acts as a single unit. • the Asthenosphere ( ~ 100’s km in de ...
Quiz 4
... 16. The Hawaiian Islands are a result of the Pacific Plate passing over a hot spot. 17. As rocks cool, they become denser and sink. 18. A hypothesis is a scientific theory that has been tested. ...
... 16. The Hawaiian Islands are a result of the Pacific Plate passing over a hot spot. 17. As rocks cool, they become denser and sink. 18. A hypothesis is a scientific theory that has been tested. ...
Our Changing Earth
... Sand dunes are large hills of sand often found in the desert. These huge features are made by wind erosion. The size and shape of dunes depend on the amount of sand, the number of plants in the area, and the strength of the winds. Winds can also blow sand dunes across the desert. The wind picks up s ...
... Sand dunes are large hills of sand often found in the desert. These huge features are made by wind erosion. The size and shape of dunes depend on the amount of sand, the number of plants in the area, and the strength of the winds. Winds can also blow sand dunes across the desert. The wind picks up s ...
origin of the late paleozoic metamorphic rocks in east
... In general, lithology of the Mersing formation consists of quartzite, metasandstone, schist, phyllite, slate and argillite. The rocks are usually black, dark to light grey in colour, sometimes showing rhythmic interbedding between arenaceous and argillaceous rocks. Thick to massive argillaceous rock ...
... In general, lithology of the Mersing formation consists of quartzite, metasandstone, schist, phyllite, slate and argillite. The rocks are usually black, dark to light grey in colour, sometimes showing rhythmic interbedding between arenaceous and argillaceous rocks. Thick to massive argillaceous rock ...
Continental Drift Reading
... theory of continental drift. Since the mapping of the Atlantic Ocean, people had noticed that the coastlines of South America and Africa looked as though they would fit like adjacent pieces of a jigsaw puzzle. Although his formal profession was meteorology, Wegener had always been curious about the ...
... theory of continental drift. Since the mapping of the Atlantic Ocean, people had noticed that the coastlines of South America and Africa looked as though they would fit like adjacent pieces of a jigsaw puzzle. Although his formal profession was meteorology, Wegener had always been curious about the ...
ES practice quiz tectonics faults folds `12
... II. Folds The type of stress that typically causes folds in rock is _____________________________. III. Faulting vs. folding. For each of the following conditions write the words “fault” or “fold” to indicate which type of deformation would be more likely for the condition. For each pair one conditi ...
... II. Folds The type of stress that typically causes folds in rock is _____________________________. III. Faulting vs. folding. For each of the following conditions write the words “fault” or “fold” to indicate which type of deformation would be more likely for the condition. For each pair one conditi ...
Ch06_Restless Earth Earthquakes
... • Continental volcanic arcs form at Andeantype convergent zones – Before subduction, sediment accumulates on a passive continental margin – Becomes an active continental margin when a subduction zone forms and deformation begins – An accretionary wedge is an accumulation of sedimentary and metamorph ...
... • Continental volcanic arcs form at Andeantype convergent zones – Before subduction, sediment accumulates on a passive continental margin – Becomes an active continental margin when a subduction zone forms and deformation begins – An accretionary wedge is an accumulation of sedimentary and metamorph ...
D1) Weathering and Erosion - Vancouver Island University
... buried beneath other rock cannot be weathered to any extent. Intrusive igneous rocks form where magma bodies cool at depths of several hundreds of metres to several tens of kilometres. In most cases sediments are turned into sedimentary rocks only when they are buried by other sediments to depths in ...
... buried beneath other rock cannot be weathered to any extent. Intrusive igneous rocks form where magma bodies cool at depths of several hundreds of metres to several tens of kilometres. In most cases sediments are turned into sedimentary rocks only when they are buried by other sediments to depths in ...
Types of rocks
... - The highest part of the mountain is called the anticline and the lowest part is called the syncline. - fault block mountains - formed by the process of thrust faulting - sedimentary rock us squeezed from the sides - forms into slabs that move up and over each other (like shingles) - rock that is t ...
... - The highest part of the mountain is called the anticline and the lowest part is called the syncline. - fault block mountains - formed by the process of thrust faulting - sedimentary rock us squeezed from the sides - forms into slabs that move up and over each other (like shingles) - rock that is t ...
2200 million years of crustal evolution: the baltic shield
... 1983). It is suggested that the first deformation was probably dominated by recumbent folds, whereas at later stages subvertical movements brought about by diapirism of granitoids prevailed. It is also possible that lower parts of the supracrustal pile have been removed by stoping of the ascending g ...
... 1983). It is suggested that the first deformation was probably dominated by recumbent folds, whereas at later stages subvertical movements brought about by diapirism of granitoids prevailed. It is also possible that lower parts of the supracrustal pile have been removed by stoping of the ascending g ...
Solutions - Heritage Collegiate
... True/False: For the following true/false questions, if a statement is not completely true, mark it false. Place a T for True and F for False on the answer sheet on page 4. 1. The rock in a fault that is higher than the fault surface is referred to as the hanging wall. 2. Strike-slip faults that are ...
... True/False: For the following true/false questions, if a statement is not completely true, mark it false. Place a T for True and F for False on the answer sheet on page 4. 1. The rock in a fault that is higher than the fault surface is referred to as the hanging wall. 2. Strike-slip faults that are ...
Settle-Carlisle booklet
... the Eden Shales were deposited. The Boreal Ocean lay just to the north and occasionally flooded the region depositing limestone layers within the Eden Shales. ...
... the Eden Shales were deposited. The Boreal Ocean lay just to the north and occasionally flooded the region depositing limestone layers within the Eden Shales. ...
20081 Study Guide_i-40
... other landmasses, construct models of the lithosphere with the materials listed above. Use Figure 4-9 on page 77 as a model. The clay represents continental crust, and the blocks represent plates. Place a 3 cm layer of clay on top of each block. Make sure that this layer is the same color for each b ...
... other landmasses, construct models of the lithosphere with the materials listed above. Use Figure 4-9 on page 77 as a model. The clay represents continental crust, and the blocks represent plates. Place a 3 cm layer of clay on top of each block. Make sure that this layer is the same color for each b ...
Volcano-tectonic control of ore deposits, southwestern New Mexico
... a 24 m.y. porphyritic rhyolite. This makes them more or less contemporaneous with the much more important molybdenum deposits (containing significant traces of tin) near Questa in Taos County and also the molybdenum prospects between Nogal and Ruidoso, Lincoln County. The age of the porphyries assoc ...
... a 24 m.y. porphyritic rhyolite. This makes them more or less contemporaneous with the much more important molybdenum deposits (containing significant traces of tin) near Questa in Taos County and also the molybdenum prospects between Nogal and Ruidoso, Lincoln County. The age of the porphyries assoc ...
Algoman orogeny
The Algoman orogeny, known as the Kenoran orogeny in Canada, was an episode of mountain-building (orogeny) during the Late Archean Eon that involved repeated episodes of continental collisions, compressions and subductions. The Superior province and the Minnesota River Valley terrane collided about 2,700 to 2,500 million years ago. The collision folded the Earth's crust and produced enough heat and pressure to metamorphose the rock. Blocks were added to the Superior province along a 1,200 km (750 mi) boundary that stretches from present-day eastern South Dakota into the Lake Huron area. The Algoman orogeny brought the Archaen Eon to a close, about 2,500 million years ago; it lasted less than 100 million years and marks a major change in the development of the earth’s crust.The Canadian shield contains belts of metavolcanic and metasedimentary rocks formed by the action of metamorphism on volcanic and sedimentary rock. The areas between individual belts consist of granites or granitic gneisses that form fault zones. These two types of belts can be seen in the Wabigoon, Quetico and Wawa subprovinces; the Wabigoon and Wawa are of volcanic origin and the Quetico is of sedimentary origin. These three subprovinces lie linearly in southwestern- to northeastern-oriented belts about 140 km (90 mi) wide on the southern portion of the Superior Province.The Slave province and portions of the Nain province were also affected. Between about 2,000 and 1,700 million years ago these combined with the Sask and Wyoming cratons to form the first supercontinent, the Kenorland supercontinent.