Petrogenesis of Oxidized Arfvedsonite Granite Gneiss from Dimra
... The arfvedsonite granite gneiss of Dimra Pahar occurs along the North Purulia Shear Zone (NPSZ) which pivots the Proterozoic Chotannagpur Gneissic Complex (CGC), Eastern India. Although minerals like arfvedsonite and aegirine depict the peralkaline nature of the pluton, the geochemistry of the rock ...
... The arfvedsonite granite gneiss of Dimra Pahar occurs along the North Purulia Shear Zone (NPSZ) which pivots the Proterozoic Chotannagpur Gneissic Complex (CGC), Eastern India. Although minerals like arfvedsonite and aegirine depict the peralkaline nature of the pluton, the geochemistry of the rock ...
tectonic plate boundaries
... b. tectonic boundary. d. tectonic ridge. _____ 3. Which of the following is NOT a type of tectonic plate boundary? a. convergent boundary c. divergent boundary b. fault-block boundary d. transform boundary _____ 4. The three ways that tectonic plates can move relative to each other are a. collide, s ...
... b. tectonic boundary. d. tectonic ridge. _____ 3. Which of the following is NOT a type of tectonic plate boundary? a. convergent boundary c. divergent boundary b. fault-block boundary d. transform boundary _____ 4. The three ways that tectonic plates can move relative to each other are a. collide, s ...
Plate Tectonics DQ - Biloxi Public Schools
... 2. Alfred Wegner’s Theory of Continental Drift was not well accepted because he couldn’t say what force could be big enough to move continents. Current theories explain this movement with---A. subduction zones at continental margins. B. hot spots forming under continents. C. magnetic reversals of th ...
... 2. Alfred Wegner’s Theory of Continental Drift was not well accepted because he couldn’t say what force could be big enough to move continents. Current theories explain this movement with---A. subduction zones at continental margins. B. hot spots forming under continents. C. magnetic reversals of th ...
IGNEOUS ROCK ASSOCIATIONS
... mostly formed by hotspot volcanism deep in the mantle usually silica undersaturated, olivine basalts; can include phonolites and nephelinites; can have a wide range of chemical compositions due to fractional crystallization. richer in alkalis and TiO2 compared to MORB’s ...
... mostly formed by hotspot volcanism deep in the mantle usually silica undersaturated, olivine basalts; can include phonolites and nephelinites; can have a wide range of chemical compositions due to fractional crystallization. richer in alkalis and TiO2 compared to MORB’s ...
Petrology and geochemistry of the metamorphic rocks in the SW
... cordierite mineral formed during contact metamorphism. On the basis of mineral chemistry, the Chlorite has ripidolite compositions and muscovite is rich in the muscovite end-member. Based on calculations, chlorite mineral in regional metamorphic rocks in the study area have formed at temperature of ...
... cordierite mineral formed during contact metamorphism. On the basis of mineral chemistry, the Chlorite has ripidolite compositions and muscovite is rich in the muscovite end-member. Based on calculations, chlorite mineral in regional metamorphic rocks in the study area have formed at temperature of ...
Plate Tectonics and Boundaries
... collected evidence and proposed the theory of Continental Drift. Hess found the “mechanism” to support the idea with his theory of Sea-Floor Spreading. ...
... collected evidence and proposed the theory of Continental Drift. Hess found the “mechanism” to support the idea with his theory of Sea-Floor Spreading. ...
Virginia Physical Geography
... The Blue Ridge province experienced mountain building during the Paleozoic era (750-700Ma). In central and northern Virginia, the 570 million year old basalts are over sedimentary rock. Some metamorphism of these rocks occurred during the formation of the Appalachian Mountains. ...
... The Blue Ridge province experienced mountain building during the Paleozoic era (750-700Ma). In central and northern Virginia, the 570 million year old basalts are over sedimentary rock. Some metamorphism of these rocks occurred during the formation of the Appalachian Mountains. ...
Plate Tectonics Vocabulary 1. asthenosphere
... asthenosphere-the upper part of the mantle on which the tectonic plates move, the ...
... asthenosphere-the upper part of the mantle on which the tectonic plates move, the ...
Introduction to Structural Geology
... *quartz-feldspathic gneisses derived by metamorphism of felsic igneous rocks *complexly mixed with greenstone belts over 10-100’s of km - greenstone belts - rocks at greenschist or lower grades of metamorphism *Greenstone - mafic to silicic volcanic rocks and shallow intrusive bodies Sutures-regions ...
... *quartz-feldspathic gneisses derived by metamorphism of felsic igneous rocks *complexly mixed with greenstone belts over 10-100’s of km - greenstone belts - rocks at greenschist or lower grades of metamorphism *Greenstone - mafic to silicic volcanic rocks and shallow intrusive bodies Sutures-regions ...
The Rocks Beneath Our Feet
... basement rocks of the Grenville Mountains is a rock group called the Ashe Metamorphic Suite. These rocks show evidence of undergoing up to four separate metamorphic events in at least three separate mountain building events. The bulk of which occurred during the Cherokee Orogeny, a mountain building ...
... basement rocks of the Grenville Mountains is a rock group called the Ashe Metamorphic Suite. These rocks show evidence of undergoing up to four separate metamorphic events in at least three separate mountain building events. The bulk of which occurred during the Cherokee Orogeny, a mountain building ...
Name________________________________________
... b. new convergent boundaries form after continents collide. c. heat builds up in Earth’s interior. d. continental lithosphere subducts. ______ 19. What causes a supercontinent to break apart? a. Heat inside Earth causes rifts to form in the supercontinent. b. The convergent boundary between two cont ...
... b. new convergent boundaries form after continents collide. c. heat builds up in Earth’s interior. d. continental lithosphere subducts. ______ 19. What causes a supercontinent to break apart? a. Heat inside Earth causes rifts to form in the supercontinent. b. The convergent boundary between two cont ...
Essential Questions: February 13-17, 2017 Name: Date: Period
... c. continental drift 4Earthquakes are a sudden motion caused by movement of tectonic plates working against a. friction b. gravity c. magnetic forces 5When an oceanic plate slides under a continental plate, what is usually formed? a. continental drift b. seafloor spreading c. subduction zone 6At wha ...
... c. continental drift 4Earthquakes are a sudden motion caused by movement of tectonic plates working against a. friction b. gravity c. magnetic forces 5When an oceanic plate slides under a continental plate, what is usually formed? a. continental drift b. seafloor spreading c. subduction zone 6At wha ...
A major crustal discontinuity in George V Land: new - MNA
... which are consistent with the 490-505 Ma SHRIMP ages on zircons reported by Fanning et al. (2002) for granitoids from the Mertz-Ninnis Gl. region. Moreover (3), dating of single-grain detrital white micas from a metasandstone (forming together with minor muscovite-bearing granites the dominant rock ...
... which are consistent with the 490-505 Ma SHRIMP ages on zircons reported by Fanning et al. (2002) for granitoids from the Mertz-Ninnis Gl. region. Moreover (3), dating of single-grain detrital white micas from a metasandstone (forming together with minor muscovite-bearing granites the dominant rock ...
Volcanoes and Igneous Activity Earth
... the Coast Ranges, the Transverse Ranges, and the Peninsular Ranges. • Subduction continued in the north forming the major volcanoes of the Cascades. • Pleistocene glaciation in the Sierra Nevada and, to a minor extent, in the San Bernardino Mountains; recent volcanic eruptions in the Mojave and Grea ...
... the Coast Ranges, the Transverse Ranges, and the Peninsular Ranges. • Subduction continued in the north forming the major volcanoes of the Cascades. • Pleistocene glaciation in the Sierra Nevada and, to a minor extent, in the San Bernardino Mountains; recent volcanic eruptions in the Mojave and Grea ...
Get out your pieces for Tectonicland Have your HOMEWORK
... plates move and shape Earth’s surface ...
... plates move and shape Earth’s surface ...
Earth Revealed - Metamorphic Rocks
... 4. Directed pressure can cause a wavy layered or banded feature called: (a) foliation (b) bedding (c) rock cleavage (d) schistic 5. Shear or sideways pressure was responsible for the swirling shape of: (a) gneiss (b) quartzite (c) quartz (d) snowball garnets 6. Which is not associated with contact m ...
... 4. Directed pressure can cause a wavy layered or banded feature called: (a) foliation (b) bedding (c) rock cleavage (d) schistic 5. Shear or sideways pressure was responsible for the swirling shape of: (a) gneiss (b) quartzite (c) quartz (d) snowball garnets 6. Which is not associated with contact m ...
Practice20m
... b) accretion of terranes to the continental margins. c) intermediate and felsic magmas intruded the edges of miniature plates. d) oceanic sediments welded to the continental margin by converging plates. 17) Which feature of Archean rocks of the Canadian Shield was not considered in their assignment ...
... b) accretion of terranes to the continental margins. c) intermediate and felsic magmas intruded the edges of miniature plates. d) oceanic sediments welded to the continental margin by converging plates. 17) Which feature of Archean rocks of the Canadian Shield was not considered in their assignment ...
PreparationForMidTerm
... chemostratigraphy (variations in ratios of stable isotopes, e.g. C13/C12 which, if they were found throughout the world's limestones, can be used for correlation… Sr 87/Sr86 is another example which we have not discussed) two concepts that we didn't cover and which you can ignore: magnetic stratigra ...
... chemostratigraphy (variations in ratios of stable isotopes, e.g. C13/C12 which, if they were found throughout the world's limestones, can be used for correlation… Sr 87/Sr86 is another example which we have not discussed) two concepts that we didn't cover and which you can ignore: magnetic stratigra ...
Chapter 11: The Archean Eon of Precambrian Time
... early Archean thin crust? small continents mostly mafic crust? ...
... early Archean thin crust? small continents mostly mafic crust? ...
6.1 himalaya 4
... 2 – Understand the unique geological features found in active continent-continent collisions and identify these in other mountain systems. ...
... 2 – Understand the unique geological features found in active continent-continent collisions and identify these in other mountain systems. ...
Lecture 5 - Plate Tectonics and Rocks
... Igneous activity occurs primarily at or near tectonic plate boundaries ...
... Igneous activity occurs primarily at or near tectonic plate boundaries ...
107-Wegner-Plates
... covered parts of South America, southern Africa, India, and southern Australia about 300 million years ago. Glacial striations (Grooves etched) on rocks show that glaciers moved from Africa toward the Atlantic Ocean and from the Atlantic Ocean onto South America. This works if the Atlantic Ocean was ...
... covered parts of South America, southern Africa, India, and southern Australia about 300 million years ago. Glacial striations (Grooves etched) on rocks show that glaciers moved from Africa toward the Atlantic Ocean and from the Atlantic Ocean onto South America. This works if the Atlantic Ocean was ...
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.