Zircon U-Pb grain ages clustering at several ages between 92 and
... • Zircon U-Pb grain ages clustering at several ages between 92 and 68 Ma and between 42 Ma and 30 Ma indicate successive or rejuvenated igneous zircon growth multiple times over long periods of Late Cretaceous time and late Eocene to Oligocene ...
... • Zircon U-Pb grain ages clustering at several ages between 92 and 68 Ma and between 42 Ma and 30 Ma indicate successive or rejuvenated igneous zircon growth multiple times over long periods of Late Cretaceous time and late Eocene to Oligocene ...
Geos-427, 527 Orogenic Systems, Spring 2011 semester, 3 cr
... geochemical aspects of Orogenic Systems and their tectonic evolution from the Precambrian to the Present using selected examples from various parts of the planet.” –Peter Coney, originator of this course Prerequisites: 427 – At least one advanced undergraduate course in geology, geochemistry, or geo ...
... geochemical aspects of Orogenic Systems and their tectonic evolution from the Precambrian to the Present using selected examples from various parts of the planet.” –Peter Coney, originator of this course Prerequisites: 427 – At least one advanced undergraduate course in geology, geochemistry, or geo ...
Thinking Point - Dynamic Earth
... minerals in rocks. The positions indicate that the continents must have moved. ...
... minerals in rocks. The positions indicate that the continents must have moved. ...
Earth Science Quiz-1 Please answer the following multiple choice
... A) fine-grained B) glassy C) coarse-grained D) porphyritic 46. Rhyolite is the fine-grained equivalent of this igneous rock. A) basalt B) andesite C) granite D) diorite 47. Select the coarse-grained rock which is composed mainly of quartz and potassium feldspar from the list below. A) basalt B) ande ...
... A) fine-grained B) glassy C) coarse-grained D) porphyritic 46. Rhyolite is the fine-grained equivalent of this igneous rock. A) basalt B) andesite C) granite D) diorite 47. Select the coarse-grained rock which is composed mainly of quartz and potassium feldspar from the list below. A) basalt B) ande ...
Evolution of the East African and related orogens, and the assembly
... has been attributed to the difference in the level of exposure, with the Mozambican rocks interpreted as lower crustal equivalents of the juvenile rocks in the Arabian–Nubian Shield. Recent geochronologic data indicate the presence of two major Pan-African tectonic events in East Africa. The East Af ...
... has been attributed to the difference in the level of exposure, with the Mozambican rocks interpreted as lower crustal equivalents of the juvenile rocks in the Arabian–Nubian Shield. Recent geochronologic data indicate the presence of two major Pan-African tectonic events in East Africa. The East Af ...
THE ROCK CYCLE
... Granite ____ (black, gray, white or pink crystals) Obsidian___ (no crystals, looks like glass) Pumice____ (lightweight, has tiny holes, floats on water) ...
... Granite ____ (black, gray, white or pink crystals) Obsidian___ (no crystals, looks like glass) Pumice____ (lightweight, has tiny holes, floats on water) ...
Plate Tectonics - Department of Physics and Astronomy
... very old, while rocks collected successively farther away from the ridge are successively older. ...
... very old, while rocks collected successively farther away from the ridge are successively older. ...
Dynamic Planet
... a) the part of California west of the San Andreas fault that is moving into the Pacific Ocean. b) the period of geologic history that predates modern life forms. c) a rift valley in east Africa where a new ocean is forming. d) the name of a previous supercontinent thought to have broken into several ...
... a) the part of California west of the San Andreas fault that is moving into the Pacific Ocean. b) the period of geologic history that predates modern life forms. c) a rift valley in east Africa where a new ocean is forming. d) the name of a previous supercontinent thought to have broken into several ...
GE 121 Physical and Historical Geology I Earth’s Dynamic Systems 10
... The major features formed at convergent plate margins are folded mountain belts, volcanic arcs, and deep-sea trenches. 7. Where plates slip horizontally past one another, transform plate boundaries develop on long, straight faults. Shallow earthquakes are common. 8. Far from plate margins, plumes of ...
... The major features formed at convergent plate margins are folded mountain belts, volcanic arcs, and deep-sea trenches. 7. Where plates slip horizontally past one another, transform plate boundaries develop on long, straight faults. Shallow earthquakes are common. 8. Far from plate margins, plumes of ...
Geologic History of NC
... of years before, in fact. Based on the age of the oldest rocks found on earth as well as in meteorites, scientists believe that the earth was formed about 4,500 million years (4.5 billion years) ago. The landmass under North Carolina began to form about 1,700 million years ago, and has been in const ...
... of years before, in fact. Based on the age of the oldest rocks found on earth as well as in meteorites, scientists believe that the earth was formed about 4,500 million years (4.5 billion years) ago. The landmass under North Carolina began to form about 1,700 million years ago, and has been in const ...
Correlation of rock layers
... thought that the Earth was only 6,000 years old. This mindset was based on biblical references. ...
... thought that the Earth was only 6,000 years old. This mindset was based on biblical references. ...
Earth & Space Science PSAE Review Part 2
... • Measures intensity of an earthquake by measuring the amplitude, or height of the seismic waves that it creates. ...
... • Measures intensity of an earthquake by measuring the amplitude, or height of the seismic waves that it creates. ...
characteristics of rocks
... surface For more about sedimentary rocks: http://www.volcanoworld.org/vwdocs/vwlessons/lessons/Sedrocks/Sedrocks1.html ...
... surface For more about sedimentary rocks: http://www.volcanoworld.org/vwdocs/vwlessons/lessons/Sedrocks/Sedrocks1.html ...
Igneous Rocks - Northside Middle School
... Bowen’s Reaction Series represents that sequence that has implications for other types of rocks as well, although it is only used to determine the crystallization sequence in a molten magma (intrusive igneous rocks). ...
... Bowen’s Reaction Series represents that sequence that has implications for other types of rocks as well, although it is only used to determine the crystallization sequence in a molten magma (intrusive igneous rocks). ...
(pages 162-165) PART 1 Chapter 6
... 6. __________________________ and ___________________________ are found in many places where compression has occurred. 7. The Central _______________________ Mountains in Pennsylvania are folded mountains made up of _____________________ and _________________________. 8. The ________________________ ...
... 6. __________________________ and ___________________________ are found in many places where compression has occurred. 7. The Central _______________________ Mountains in Pennsylvania are folded mountains made up of _____________________ and _________________________. 8. The ________________________ ...
The Rock Cycle
... • When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change. Marble is an example of a sedimentary or igneous rock that has been changed into a metamorphic rock. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. ...
... • When the earth's crust moves, it causes rocks to get squeezed so hard that the heat causes the rock to change. Marble is an example of a sedimentary or igneous rock that has been changed into a metamorphic rock. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. ...
Chapter 11
... the sources and particle sizes of sedimentary rocks. Most sedimentary rocks are derived from preexisting rocks, or from organic materials, such as bone and shell that form limestone, mud that becomes compacted into shale, and ancient plant remains that become compacted into coal. The exogenic proces ...
... the sources and particle sizes of sedimentary rocks. Most sedimentary rocks are derived from preexisting rocks, or from organic materials, such as bone and shell that form limestone, mud that becomes compacted into shale, and ancient plant remains that become compacted into coal. The exogenic proces ...
Metamorphic Rocks
... Metamorphic rocks, one of three basic rock categories, are formed by the recrystallization of older (pre-existing) rocks due to changes in temperature, pressure and/or fluid conditions at depths below the Earth’s surface. This action results in changes in mineral composition and texture while the ro ...
... Metamorphic rocks, one of three basic rock categories, are formed by the recrystallization of older (pre-existing) rocks due to changes in temperature, pressure and/or fluid conditions at depths below the Earth’s surface. This action results in changes in mineral composition and texture while the ro ...
Inside Earth: Chapter 1- Plate Tectonics
... Cause of Tsunamis • A tsunami triggered by an earthquake occurs where a slab of the ocean floor is displaced vertically along a fault. • A tsunami also can occur when the vibration of a quake sets an underwater landslide into motion. ...
... Cause of Tsunamis • A tsunami triggered by an earthquake occurs where a slab of the ocean floor is displaced vertically along a fault. • A tsunami also can occur when the vibration of a quake sets an underwater landslide into motion. ...
Lecture 17
... Magmas have higher concentrations of some elements that most other rocks and depending on the cooling processes affecting the magma, very high concentrations of certain elements can occur. Basic transport – diamonds are carried to the surface/near surface by exotic ultramafic volcanic rocks from a s ...
... Magmas have higher concentrations of some elements that most other rocks and depending on the cooling processes affecting the magma, very high concentrations of certain elements can occur. Basic transport – diamonds are carried to the surface/near surface by exotic ultramafic volcanic rocks from a s ...
unraveling the formation of continental crust : a review and outlook
... and voluminous sedimentary deposits led to a thick, rigid cratonic lithosphere, while the anatexis-induced plutonic granitoids lightened the lithosphere and prevented it from sinking into the asthenosphere. This lighter rigid lithosphere was also classified as buoyant tectosphere or relatively high- ...
... and voluminous sedimentary deposits led to a thick, rigid cratonic lithosphere, while the anatexis-induced plutonic granitoids lightened the lithosphere and prevented it from sinking into the asthenosphere. This lighter rigid lithosphere was also classified as buoyant tectosphere or relatively high- ...
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.