Chapter 22: A Classification of Metamorphic Rocks
... Gneiss: a metamorphic rock displaying gneissose structure. Gneisses are typically layered (also called banded), generally with alternating felsic and darker mineral layers. Gneisses may also be lineated, but must also show segregations of felsic-mineral-rich and darkmineral-rich concentrations. ...
... Gneiss: a metamorphic rock displaying gneissose structure. Gneisses are typically layered (also called banded), generally with alternating felsic and darker mineral layers. Gneisses may also be lineated, but must also show segregations of felsic-mineral-rich and darkmineral-rich concentrations. ...
Geologic Road Log Cumbres and Toltec Scenic Railroad A
... pegmatite. The older unit is an intermediate composition intrusive rock known as granodiorite that was emplaced at depths of 10 to 15 km in the middle crust about 1.7 billion years ago. This rock was deformed during southward growth and assembly of the North American continent during Proterozoic tim ...
... pegmatite. The older unit is an intermediate composition intrusive rock known as granodiorite that was emplaced at depths of 10 to 15 km in the middle crust about 1.7 billion years ago. This rock was deformed during southward growth and assembly of the North American continent during Proterozoic tim ...
Name of volcanologist
... Each group will give a presentation of their research findings using their posters, models, and other information. [More information about the written summary, poster, model, group presentation and deadlines will come at a later date.] ...
... Each group will give a presentation of their research findings using their posters, models, and other information. [More information about the written summary, poster, model, group presentation and deadlines will come at a later date.] ...
Exploring How Rocks Are Formed
... on the processes by which these rocks are formed, students are allowed to perform activities which will help them understand the conditions leading to rock formation. Targeted Objective: Explain the three ways rocks are formed. Background: Igneous rocks are made from cooled and hardened magma. Magma ...
... on the processes by which these rocks are formed, students are allowed to perform activities which will help them understand the conditions leading to rock formation. Targeted Objective: Explain the three ways rocks are formed. Background: Igneous rocks are made from cooled and hardened magma. Magma ...
37. Igneous and Metasedimentary Basement Lithofacies of the
... that display a poorly to moderately developed cleavage in finer-grained lithologies and very poorly developed anastomosing dissolution cleavage in coarser-grained rocks. By contrast, metasediments at Site 824 are low-grade quartz-muscovite-feldspar schists. Original sedimentary lamination is poorly ...
... that display a poorly to moderately developed cleavage in finer-grained lithologies and very poorly developed anastomosing dissolution cleavage in coarser-grained rocks. By contrast, metasediments at Site 824 are low-grade quartz-muscovite-feldspar schists. Original sedimentary lamination is poorly ...
Ch 5 S 4 Sea-Floor Spreading
... c. Subduction and Earth’s Oceans i. Subduction and sea-floor spreading can change the size and shape of the oceans ii. The ocean floor is renewed about every 200 million years iii.The Pacific Ocean covers almost 1/3 of Earth 1. It is shrinking 2. Sometimes a deep ocean trench swallows more oceanic ...
... c. Subduction and Earth’s Oceans i. Subduction and sea-floor spreading can change the size and shape of the oceans ii. The ocean floor is renewed about every 200 million years iii.The Pacific Ocean covers almost 1/3 of Earth 1. It is shrinking 2. Sometimes a deep ocean trench swallows more oceanic ...
LP 13-17 February 2017
... - I will begin learning about my Satellite Imagery -Topographic Map Conversion - I will participate in the Project where I will create a topographic Topographic/Satellite Image Match Up to map from an assigned satellite image. illustrate the relationship between satellite - I will discuss my assigne ...
... - I will begin learning about my Satellite Imagery -Topographic Map Conversion - I will participate in the Project where I will create a topographic Topographic/Satellite Image Match Up to map from an assigned satellite image. illustrate the relationship between satellite - I will discuss my assigne ...
Petrology and Geochemistry of Lavas
... xenoliths of mafic metaigneous rocks and made a preliminary crustal model based on Arenal xenoliths. Substantial petrologic data exists for individual volcanoes, including Irazú [37], Concepción [38] and Arenal [39]. Tournon [23] obtained petrologic results for several Costa Rican volcanoes, making ...
... xenoliths of mafic metaigneous rocks and made a preliminary crustal model based on Arenal xenoliths. Substantial petrologic data exists for individual volcanoes, including Irazú [37], Concepción [38] and Arenal [39]. Tournon [23] obtained petrologic results for several Costa Rican volcanoes, making ...
9. Earthquakes and Seismology
... B. The energy from fault movement is released in the form of seismic waves 1. These waves radiate out from the source like the ripples produced in water when a rock is thrown in a pond 2. These waves move outward in concentric circles from the source C. Most earthquakes result when rocks rupture fro ...
... B. The energy from fault movement is released in the form of seismic waves 1. These waves radiate out from the source like the ripples produced in water when a rock is thrown in a pond 2. These waves move outward in concentric circles from the source C. Most earthquakes result when rocks rupture fro ...
Earthquake risk - EdCommunity
... that only Earthquake Locations are showing on the map. Do earthquakes occur in the Comparing the population density of southeast Asia to earthquakes, volcanoes, and places you expect? plate boundaries in the Our World GIS Education curriculum. 3. Turn on the volcanoes layer. What patterns do actua ...
... that only Earthquake Locations are showing on the map. Do earthquakes occur in the Comparing the population density of southeast Asia to earthquakes, volcanoes, and places you expect? plate boundaries in the Our World GIS Education curriculum. 3. Turn on the volcanoes layer. What patterns do actua ...
magnetic stripes
... sediments they don't use the sediments, they use the microfossils deposited on the sea floor as they die and rain down on the sediments. They also use the volcanic basement rocks that the sediments sit on as an added method. ...
... sediments they don't use the sediments, they use the microfossils deposited on the sea floor as they die and rain down on the sediments. They also use the volcanic basement rocks that the sediments sit on as an added method. ...
How Erosion Builds Mountains
... Such collisions have created some spectacular topography, such as the Tibetan Plateau and the Himalayas, which include all 10 of the world’s highest peaks. The flow of magma and heat to the earth’s crust, for example, during volcanic activity, can also drive mountain building. The earth’s longest mo ...
... Such collisions have created some spectacular topography, such as the Tibetan Plateau and the Himalayas, which include all 10 of the world’s highest peaks. The flow of magma and heat to the earth’s crust, for example, during volcanic activity, can also drive mountain building. The earth’s longest mo ...
How Erosion Builds Mountains
... Such collisions have created some spectacular topography, such as the Tibetan Plateau and the Himalayas, which include all 10 of the world’s highest peaks. The flow of magma and heat to the earth’s crust, for example, during volcanic activity, can also drive mountain building. The earth’s longest mo ...
... Such collisions have created some spectacular topography, such as the Tibetan Plateau and the Himalayas, which include all 10 of the world’s highest peaks. The flow of magma and heat to the earth’s crust, for example, during volcanic activity, can also drive mountain building. The earth’s longest mo ...
What Happens to Create the Lode?
... rocks), by the accumulation of biogenic activity (fossils), and by precipitation from solution. As sediment deposits build up, the overburden (or lithostatic) pressure squeezes the sediment into layered solids in a process known as lithification ("rock formation"). Sedimentary rocks contain importan ...
... rocks), by the accumulation of biogenic activity (fossils), and by precipitation from solution. As sediment deposits build up, the overburden (or lithostatic) pressure squeezes the sediment into layered solids in a process known as lithification ("rock formation"). Sedimentary rocks contain importan ...
How Erosion Builds Mountains
... Such collisions have created some spectacular topography, such as the Tibetan Plateau and the Himalayas, which include all 10 of the world’s highest peaks. The flow of magma and heat to the earth’s crust, for example, during volcanic activity, can also drive mountain building. The earth’s longest mo ...
... Such collisions have created some spectacular topography, such as the Tibetan Plateau and the Himalayas, which include all 10 of the world’s highest peaks. The flow of magma and heat to the earth’s crust, for example, during volcanic activity, can also drive mountain building. The earth’s longest mo ...
Presentation
... • an introduction to plate tectonics; • distinction between the ‘facts’ of plate tectonics and the evidence used to support plate tectonic theory; • a survey of some of the evidence supporting plate tectonic theory; • explanation of some of the hazards caused by plate tectonic processes earthquakes ...
... • an introduction to plate tectonics; • distinction between the ‘facts’ of plate tectonics and the evidence used to support plate tectonic theory; • a survey of some of the evidence supporting plate tectonic theory; • explanation of some of the hazards caused by plate tectonic processes earthquakes ...
Cascadia subduction slab heterogeneity revealed by three
... We highlight two features in this reflectivity model. First, the migration algorithm recovers the 410 km discontinuity approximately as a flat interface near 410 km depth. Second, east of 121°W longitude, a strong negative (blue) signal appears between 150 and 200 km depth. We identify this signal as ...
... We highlight two features in this reflectivity model. First, the migration algorithm recovers the 410 km discontinuity approximately as a flat interface near 410 km depth. Second, east of 121°W longitude, a strong negative (blue) signal appears between 150 and 200 km depth. We identify this signal as ...
1 Radioactive and Radiogenic Isotopes Isotopes: Same Z, different
... an isochron diagram of 40Ar/36Ar vs. K/36Ar (or 39Ar/36Ar in the case of 40Ar/39Ar dating), the intercept with the ordinate should be equal to 295.5 if the dated sample contained no inherited or excess 40Ar. To avoid errors that may arise from determining K and Ar separately by two different techniq ...
... an isochron diagram of 40Ar/36Ar vs. K/36Ar (or 39Ar/36Ar in the case of 40Ar/39Ar dating), the intercept with the ordinate should be equal to 295.5 if the dated sample contained no inherited or excess 40Ar. To avoid errors that may arise from determining K and Ar separately by two different techniq ...
The Making of the Japan Sea and the Japanese Mountains
... geographical framework: worldwide tectonic events must be taken into account to explain the pressures, movements, and rock compositions appearing in its geological record. The formation of the Japan Sea back-arc basin and creation of the Japanese archipelago off the Eurasian continent was one of the ...
... geographical framework: worldwide tectonic events must be taken into account to explain the pressures, movements, and rock compositions appearing in its geological record. The formation of the Japan Sea back-arc basin and creation of the Japanese archipelago off the Eurasian continent was one of the ...
Edible Plate Tectonics
... b. How might the movement of tectonic plates help build up Earth’s crust? When plates collide, crust is pushed upward and mountains are built. When plates move apart, magma flows up to the surface of the Earth creating new crust. Volcanic eruptions from plate motion allows lava to flow creating ne ...
... b. How might the movement of tectonic plates help build up Earth’s crust? When plates collide, crust is pushed upward and mountains are built. When plates move apart, magma flows up to the surface of the Earth creating new crust. Volcanic eruptions from plate motion allows lava to flow creating ne ...
Earthquakes
... autos rock noticeably. Felt by most people; some breakage of dishes, windows, and plaster; unstable objects overturned; disturbance of trees, poles, and other tall objects. ...
... autos rock noticeably. Felt by most people; some breakage of dishes, windows, and plaster; unstable objects overturned; disturbance of trees, poles, and other tall objects. ...
Large igneous province
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive), when hot magma extrudes from inside the Earth and flows out. The source of many or all LIPs is variously attributed to mantle plumes or to processes associated with plate tectonics. Types of LIPs can include large volcanic provinces (LVP), created through flood basalt and large plutonic provinces (LPP). Eleven distinct flood basalt episodes occurred in the past 250 million years, creating volcanic provinces, which coincided with mass extinctions in prehistoric times. Formation depends on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexisting climate state, and the biota resilience to change.