Geology of the Alberts Lake Area (NTS 64K13SE and 14SW
... aphyric basalt in the southwest part of the map area, close to the contact with gabbro (10). Most of these units are interpreted as diabase sills (9e), but pillowed plagioclase-phyric basalt and related breccia (4a) also occur at that locality. One unit is megaphyric, with localized concentrations o ...
... aphyric basalt in the southwest part of the map area, close to the contact with gabbro (10). Most of these units are interpreted as diabase sills (9e), but pillowed plagioclase-phyric basalt and related breccia (4a) also occur at that locality. One unit is megaphyric, with localized concentrations o ...
Editorial Geology and Tectonic Setting of the
... Antarctic Orogen (EAAO) and represents the upper crustal equivalent of the high-grade Mozambique Belt (MB). The juxtaposition of the ANS low-grade basement rocks and the MB high-grade rocks is documented in various domains, particularly in southern Ethiopia and Kenya. The ANS itself is considered by ...
... Antarctic Orogen (EAAO) and represents the upper crustal equivalent of the high-grade Mozambique Belt (MB). The juxtaposition of the ANS low-grade basement rocks and the MB high-grade rocks is documented in various domains, particularly in southern Ethiopia and Kenya. The ANS itself is considered by ...
08_chapter 2
... contraction and expansion of lichen thallus by microclimatic wetting and drying (Moses and Smith 1993), incorporation of mineral fragments into the thallus, swelling action of the organic and inorganic salts produced due to lichen activity. Chemical disruption is due to the generation of respiratory ...
... contraction and expansion of lichen thallus by microclimatic wetting and drying (Moses and Smith 1993), incorporation of mineral fragments into the thallus, swelling action of the organic and inorganic salts produced due to lichen activity. Chemical disruption is due to the generation of respiratory ...
Ch 19 Continental Alk mod 8
... Melilitite a predominantly melilite - clinopyroxene volcanic (if > 10% olivine they are called olivine melilitites) Shoshonite K-rich basalt with K-feldspar ± leucite Phonolite felsic alkaline volcanic with alkali feldspar + nepheline. See Fig. 14-2. (plutonic = nepheline syenite) Comendite peralkal ...
... Melilitite a predominantly melilite - clinopyroxene volcanic (if > 10% olivine they are called olivine melilitites) Shoshonite K-rich basalt with K-feldspar ± leucite Phonolite felsic alkaline volcanic with alkali feldspar + nepheline. See Fig. 14-2. (plutonic = nepheline syenite) Comendite peralkal ...
Plate Tectonics and Deformation of the Crust
... ridge the sediment was, the older it was. ► This data confirmed Hess’s idea about seafloor spreading. The youngest oceanic crust is at the center of the ridge and the oldest oceanic crust is at the continental margin. ...
... ridge the sediment was, the older it was. ► This data confirmed Hess’s idea about seafloor spreading. The youngest oceanic crust is at the center of the ridge and the oldest oceanic crust is at the continental margin. ...
Chapter 4 Section 2 Igneous Rock
... The light-colored rocks are less dense than the darkcolored rocks are. The light-colored rocks are rich in elements such as aluminum, potassium, silicon, and sodium. These rocks are called felsic rocks. The dark-colored rocks, called mafic rocks, are rich in calcium, iron, and magnesium, and p ...
... The light-colored rocks are less dense than the darkcolored rocks are. The light-colored rocks are rich in elements such as aluminum, potassium, silicon, and sodium. These rocks are called felsic rocks. The dark-colored rocks, called mafic rocks, are rich in calcium, iron, and magnesium, and p ...
Chapter 4 Section 2 Igneous Rock
... The light-colored rocks are less dense than the darkcolored rocks are. The light-colored rocks are rich in elements such as aluminum, potassium, silicon, and sodium. These rocks are called felsic rocks. The dark-colored rocks, called mafic rocks, are rich in calcium, iron, and magnesium, and p ...
... The light-colored rocks are less dense than the darkcolored rocks are. The light-colored rocks are rich in elements such as aluminum, potassium, silicon, and sodium. These rocks are called felsic rocks. The dark-colored rocks, called mafic rocks, are rich in calcium, iron, and magnesium, and p ...
The Qaidam basin in Western China: monitoring
... floor shows crustal scale folding with a wave length of ca. 30 - 40 kilometers. This suggests an unusually strong rheology of the deeper crust, likely due to predominance of mafic rocks. These relationships suggest the peculiar feature of the Qaidam basin, which must have a much rheologically strong ...
... floor shows crustal scale folding with a wave length of ca. 30 - 40 kilometers. This suggests an unusually strong rheology of the deeper crust, likely due to predominance of mafic rocks. These relationships suggest the peculiar feature of the Qaidam basin, which must have a much rheologically strong ...
Earth Science – Quiz 2
... B) divergent C) convergent D) all plate boundaries 15. Linear, magnetic patterns associated with mid-ocean ridges are configured as ________. A) concentric circles about a rising plume of hot mantle rocks and magma B) reversed magnetizations along the rift valleys and normal magnetizations along the ...
... B) divergent C) convergent D) all plate boundaries 15. Linear, magnetic patterns associated with mid-ocean ridges are configured as ________. A) concentric circles about a rising plume of hot mantle rocks and magma B) reversed magnetizations along the rift valleys and normal magnetizations along the ...
the Exciting World of Earthquakes Part I
... horizontally past one another. Most faulting along spreading zones is normal, along subduction zones is thrust, and along transform faults is strike-slip. Geologists have found that earthquakes tend to reoccur along faults, which reflect zones of weakness in the Earth's crust. Even if a fault zone h ...
... horizontally past one another. Most faulting along spreading zones is normal, along subduction zones is thrust, and along transform faults is strike-slip. Geologists have found that earthquakes tend to reoccur along faults, which reflect zones of weakness in the Earth's crust. Even if a fault zone h ...
Sedimentary Rocks I
... • Cementation: minerals fill the spaces between sediments and act as glue. • Compaction: sediments are pressurized to become rock. • Breccia: sharp rocks (or sediments) cemented together to form one rock • Conglomerate: rocks cemented together to form one rock (rounded edges). ...
... • Cementation: minerals fill the spaces between sediments and act as glue. • Compaction: sediments are pressurized to become rock. • Breccia: sharp rocks (or sediments) cemented together to form one rock • Conglomerate: rocks cemented together to form one rock (rounded edges). ...
Self-guided tour to Sai Kung
... during the Jurassic Period. Volcanic centers were present around the caldera. Thick layers of volcanic ashes, lavas and tephra were formed on the surface during several eruption episodes. These were ‘Plinian’ type eruptions, which can last up to a few weeks. A sequence of ash over 100 m thick was de ...
... during the Jurassic Period. Volcanic centers were present around the caldera. Thick layers of volcanic ashes, lavas and tephra were formed on the surface during several eruption episodes. These were ‘Plinian’ type eruptions, which can last up to a few weeks. A sequence of ash over 100 m thick was de ...
Plate tectonics - Brogranoni-GEO1
... The earth's crust is broken up into pieces. These pieces are called plates. Heat rising and falling inside the mantle creates convection currents. The convection currents move the plates. The movement of the plates, and the activity inside the earth, is called plate tectonics. Plate tectonics cause ...
... The earth's crust is broken up into pieces. These pieces are called plates. Heat rising and falling inside the mantle creates convection currents. The convection currents move the plates. The movement of the plates, and the activity inside the earth, is called plate tectonics. Plate tectonics cause ...
Geology
... L is for Land: The ocean floor is constantly recycled as it is subducted beneath the edges of continents and other ocean plates. The land is built up from continental plates that gradually build in size as ocean archipelagos dock with the land, joining felsic rock in batholiths under the mountain c ...
... L is for Land: The ocean floor is constantly recycled as it is subducted beneath the edges of continents and other ocean plates. The land is built up from continental plates that gradually build in size as ocean archipelagos dock with the land, joining felsic rock in batholiths under the mountain c ...
Chapter 2: Rocks of the Southeastern US
... During the Grenville Orogeny, friction between the converging plates pushed magma into the overlying crust. Some magma rose high enough to intrude through the overlying sedimentary rocks, but it remained well below the surface. These amorphous intrusions eventually cooled and crystallized (Figure 2. ...
... During the Grenville Orogeny, friction between the converging plates pushed magma into the overlying crust. Some magma rose high enough to intrude through the overlying sedimentary rocks, but it remained well below the surface. These amorphous intrusions eventually cooled and crystallized (Figure 2. ...
Dating the Earth 6-to-a-page
... – the physical and biological history of Earth resulted from a series of sudden widespread catastrophes which accounted for significant and rapid changes in Earth and exterminated existing life in the affected area – six major catastrophes occurred, corresponding to the six days of biblical creation ...
... – the physical and biological history of Earth resulted from a series of sudden widespread catastrophes which accounted for significant and rapid changes in Earth and exterminated existing life in the affected area – six major catastrophes occurred, corresponding to the six days of biblical creation ...
Defining an Earthquake
... Stress: forces imposed on rock Strain: change in shape of rock, in response to stress Rocks deform elastically under low stress: revert to former shape when stress is removed Rocks deform plastically under high stress: permanently ...
... Stress: forces imposed on rock Strain: change in shape of rock, in response to stress Rocks deform elastically under low stress: revert to former shape when stress is removed Rocks deform plastically under high stress: permanently ...
Nipigon GeoTour
... Hidden beneath the waters of Lake Superior is the geological secret to its existence: a thick sequence of rocks that fills an ancient rift valley. These rocks underlie the entire lake, but only to the west and south are they well exposed on land. The history of these ancient rift rocks began 1.1 bil ...
... Hidden beneath the waters of Lake Superior is the geological secret to its existence: a thick sequence of rocks that fills an ancient rift valley. These rocks underlie the entire lake, but only to the west and south are they well exposed on land. The history of these ancient rift rocks began 1.1 bil ...
3 The Geology and Tectonics of Kyushu. Part 1: Tectonic Setting and
... new subduction zone and thoroughly metamorphosed and intensely deformed under highpressure/low-temperature conditions. The Chichubu Belt and the older part of the Shimanto Belt are mostly trench sediments that were offscraped or slope deposits that accumulated at the same time. All of this accretion ...
... new subduction zone and thoroughly metamorphosed and intensely deformed under highpressure/low-temperature conditions. The Chichubu Belt and the older part of the Shimanto Belt are mostly trench sediments that were offscraped or slope deposits that accumulated at the same time. All of this accretion ...
C3 Chemicals in our Lives
... Large-scale industrialisation caused a shortage of alkalis in the 19th century, so a new method had to be found: I’m an old scientist. I used to make alkalis from limestone and salt using coal as a fuel. The only problem was that it made a lot of ...
... Large-scale industrialisation caused a shortage of alkalis in the 19th century, so a new method had to be found: I’m an old scientist. I used to make alkalis from limestone and salt using coal as a fuel. The only problem was that it made a lot of ...
Evolution and the Environment
... Large-scale industrialisation caused a shortage of alkalis in the 19th century, so a new method had to be found: I’m an old scientist. I used to make alkalis from limestone and salt using coal as a fuel. The only problem was that it made a lot of ...
... Large-scale industrialisation caused a shortage of alkalis in the 19th century, so a new method had to be found: I’m an old scientist. I used to make alkalis from limestone and salt using coal as a fuel. The only problem was that it made a lot of ...
Earthquakes Assessment
... a. There is more moisture in the atmosphere. b. Ash reflects energy from the sun, so it does not reach the surface. c. More pollen blocks sunlight coming into the atmosphere. d. More carbon dioxide enters the atmosphere. 26. Increased levels of greenhouse gases in the atmosphere result in: a. Greate ...
... a. There is more moisture in the atmosphere. b. Ash reflects energy from the sun, so it does not reach the surface. c. More pollen blocks sunlight coming into the atmosphere. d. More carbon dioxide enters the atmosphere. 26. Increased levels of greenhouse gases in the atmosphere result in: a. Greate ...
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.