A case for drilling the Dufek layered mafic intrusion, Antarctica
... Nd/144Nd = 0.51213 ± 1 – 0.51233 ± 4; and 207Pb/204Pb = 15.544 – 15.873). These ratios can vary both between one mineral type in different rocks and between different mineral types in the same rock. Differences between minerals in the same rock become more pronounced toward the top of the intrusion, ...
... Nd/144Nd = 0.51213 ± 1 – 0.51233 ± 4; and 207Pb/204Pb = 15.544 – 15.873). These ratios can vary both between one mineral type in different rocks and between different mineral types in the same rock. Differences between minerals in the same rock become more pronounced toward the top of the intrusion, ...
Rocks
... Sedimentary rocks are economically important in that they can be used as construction material. 3. Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed ...
... Sedimentary rocks are economically important in that they can be used as construction material. 3. Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed ...
THE MOUNTAIN STATES
... But Wyoming was also the site of natural wonders. Chief among those wonders is the Yellowstone River region, a surreal quadrant of steam-vented land in the northwest corner of the state. Yellowstone's mysterious geysers, hot springs, petrified forests, and waterfalls stirred the imagination of all w ...
... But Wyoming was also the site of natural wonders. Chief among those wonders is the Yellowstone River region, a surreal quadrant of steam-vented land in the northwest corner of the state. Yellowstone's mysterious geysers, hot springs, petrified forests, and waterfalls stirred the imagination of all w ...
Abstract - gemoc - Macquarie University
... lithosphere, fragmented and stranded during the rifting process at the opening of the ocean basin. The highvelocity domains extending out from the coastlines are not uniformly distributed along the basin edge. The most marked high-velocity regions off SE South America and northwest and southwest Afr ...
... lithosphere, fragmented and stranded during the rifting process at the opening of the ocean basin. The highvelocity domains extending out from the coastlines are not uniformly distributed along the basin edge. The most marked high-velocity regions off SE South America and northwest and southwest Afr ...
1.2 Billion Years Ago to 750 Million Years Ago Around 1.2 billion
... Washington and the Pacific Northwest. The North American Plate being forced westward created massive friction between the westward-moving continent and the eastward-moving floor of the Pacific Ocean. The floor of the eastern Pacific Ocean was composed of an oceanic plate known as the Farallon Plate. ...
... Washington and the Pacific Northwest. The North American Plate being forced westward created massive friction between the westward-moving continent and the eastward-moving floor of the Pacific Ocean. The floor of the eastern Pacific Ocean was composed of an oceanic plate known as the Farallon Plate. ...
EGU2017
... (LMT). Analysis of the dataset reveals a clear 3-D geoelectrical behaviour and extreme complexity for most of the sites, including an extremely high number of sites with phases out-of-quadrant at long periods. 3-D inverse modelling of the MT data shows high resistivity Archean units and low resistiv ...
... (LMT). Analysis of the dataset reveals a clear 3-D geoelectrical behaviour and extreme complexity for most of the sites, including an extremely high number of sites with phases out-of-quadrant at long periods. 3-D inverse modelling of the MT data shows high resistivity Archean units and low resistiv ...
File
... crust is thin and compact (about 10 km thick) and composed of dense basaltic rocks. Continental crust is between 20 and 60 kilometers thick and composed of less dense granitic rocks. 11. Why does continental crust stand higher on the mantle than oceanic crust? The continental crust stands higher tha ...
... crust is thin and compact (about 10 km thick) and composed of dense basaltic rocks. Continental crust is between 20 and 60 kilometers thick and composed of less dense granitic rocks. 11. Why does continental crust stand higher on the mantle than oceanic crust? The continental crust stands higher tha ...
Ch 12 and 13 ppt 2010
... observe today have been at work for a very long time “the present is the key to the past” ...
... observe today have been at work for a very long time “the present is the key to the past” ...
Name Date_________Core____ Inside the Restless Earth – Ch. 4
... joined together (Wegener included this in his theory); can date back to 245 million years ago ...
... joined together (Wegener included this in his theory); can date back to 245 million years ago ...
INDEPTH4-Summary v 10
... this region have been cited to argue that a) uplift is due to internal imbricate “stacking” of Asian crust while b) Asian continental lithosphere is being detached and “subducted” into the Tibetan mantle. Such models contrast with a competing paradigm, derived primarily from observations in the sout ...
... this region have been cited to argue that a) uplift is due to internal imbricate “stacking” of Asian crust while b) Asian continental lithosphere is being detached and “subducted” into the Tibetan mantle. Such models contrast with a competing paradigm, derived primarily from observations in the sout ...
Tectonic Disposition of Back-Arc Andaman Basin and its
... where volcanism is recorded intermittently. In southern continuation, however, rampant volcanism prevails along this zone. Back arc basins are gaining much importance as they are found to have fairly good potential for hydrocarbons. It has emerged from the present study that the petroliferous Irrawa ...
... where volcanism is recorded intermittently. In southern continuation, however, rampant volcanism prevails along this zone. Back arc basins are gaining much importance as they are found to have fairly good potential for hydrocarbons. It has emerged from the present study that the petroliferous Irrawa ...
Nitrogen Cycling in Lake Superior and the Effects of Climate Change
... Funded by the National Science Foundation and Sustainable Futures Institute for the S-STEM Research Program. Figure 1: Map of Lake Superior and surrounding geographic areas ...
... Funded by the National Science Foundation and Sustainable Futures Institute for the S-STEM Research Program. Figure 1: Map of Lake Superior and surrounding geographic areas ...
Rocks Notes
... 3) Biological sedimentary rocks -Formed of biological sediment or affected by biological activity -Ex. -Coal – made of decomposed plant material -Coquina – made of shell fragments (calcite) -Fossil limestone – limestone containing fossils Metamorphic Rocks -Rocks that have been changed by heat and o ...
... 3) Biological sedimentary rocks -Formed of biological sediment or affected by biological activity -Ex. -Coal – made of decomposed plant material -Coquina – made of shell fragments (calcite) -Fossil limestone – limestone containing fossils Metamorphic Rocks -Rocks that have been changed by heat and o ...
Tectonic Plate Boundaries Inquiry Lesson
... 5. Push the two plates together to see the magma rise between them. 6. Pull them apart to represent sea-floor spreading. a. Sea-floor spreading – when plates move away from each other filling the gap with new rock. 7. Grab one gram cracker square. 8. Place it on the frosting next to the oceanic plat ...
... 5. Push the two plates together to see the magma rise between them. 6. Pull them apart to represent sea-floor spreading. a. Sea-floor spreading – when plates move away from each other filling the gap with new rock. 7. Grab one gram cracker square. 8. Place it on the frosting next to the oceanic plat ...
8.1 Earth has several layers
... Tectonic plates push together at convergent boundaries • At convergent boundaries crust is either folded or destroyed • subduction—the process by which an oceanic tectonic plate sinks under another plate into Earth’s mantle • 3 types of convergent boundaries: – Continental-continental collision – O ...
... Tectonic plates push together at convergent boundaries • At convergent boundaries crust is either folded or destroyed • subduction—the process by which an oceanic tectonic plate sinks under another plate into Earth’s mantle • 3 types of convergent boundaries: – Continental-continental collision – O ...
5. North Atlantic Tertiary Igneous Province (NATP)
... Plutonic gabbro intrusions (Cuillin Hills) ...
... Plutonic gabbro intrusions (Cuillin Hills) ...
17.3-homework - Maples Elementary School
... _________13. Which of the following best describes what happens when a oceanic plate converges with a continental plate? a. a deep-sea trench and a island arc form b. both plates become fractured, and a series of long faults form on the surface c. both plates crumple and a folded mountain range form ...
... _________13. Which of the following best describes what happens when a oceanic plate converges with a continental plate? a. a deep-sea trench and a island arc form b. both plates become fractured, and a series of long faults form on the surface c. both plates crumple and a folded mountain range form ...
Continental Margins
... The continental shelves are found adjacent to most of the earth's coasts, sloping gently away from the shore to a depth of about 200 meters. ...
... The continental shelves are found adjacent to most of the earth's coasts, sloping gently away from the shore to a depth of about 200 meters. ...
The Theory of Tectonic Plates
... The magma is cooled and forms new ocean floor. The volcanic country of Iceland, which straddles the Mid-Atlantic Ridge, offers scientists a natural laboratory for studying on land the processes also occurring along the submerged parts of a spreading ridge. Iceland is splitting along the spreading ...
... The magma is cooled and forms new ocean floor. The volcanic country of Iceland, which straddles the Mid-Atlantic Ridge, offers scientists a natural laboratory for studying on land the processes also occurring along the submerged parts of a spreading ridge. Iceland is splitting along the spreading ...
The Theory of Tectonic Plates
... The magma is cooled and forms new ocean floor. The volcanic country of Iceland, which straddles the Mid-Atlantic Ridge, offers scientists a natural laboratory for studying on land the processes also occurring along the submerged parts of a spreading ridge. Iceland is splitting along the spreading ...
... The magma is cooled and forms new ocean floor. The volcanic country of Iceland, which straddles the Mid-Atlantic Ridge, offers scientists a natural laboratory for studying on land the processes also occurring along the submerged parts of a spreading ridge. Iceland is splitting along the spreading ...
The Theory of Tectonic Plates
... I think that the reason cool rock material sinks and warm rock material rises while in convection is because molten rock (warm rock) is less dense than cool, solid rock. Usually the less dense molten rock would cover the denser solid (cool) rock, and after many times, the cool denser rock will be pu ...
... I think that the reason cool rock material sinks and warm rock material rises while in convection is because molten rock (warm rock) is less dense than cool, solid rock. Usually the less dense molten rock would cover the denser solid (cool) rock, and after many times, the cool denser rock will be pu ...
Geology Study Guide - Iowa City Community School District
... 1. Give evidence that Earth’s plates are moving. 2. What are the three ways Earth’s crusts can move in relation to one another? Be able to explain. ...
... 1. Give evidence that Earth’s plates are moving. 2. What are the three ways Earth’s crusts can move in relation to one another? Be able to explain. ...
Chloe Powell and Thomas paper
... OTHER EVIDENCE • Isotopic data: indicates sinistral displacement between Amazonia & proto-Laurentia • Growth of southeaster Laurentia during Grenville orogenesis • Pb and Sm-Nd dates show Grenville basement to E of NY-AL was part of Amazonia, added to proto-Laurentia during Grenville Orogeny • Pb d ...
... OTHER EVIDENCE • Isotopic data: indicates sinistral displacement between Amazonia & proto-Laurentia • Growth of southeaster Laurentia during Grenville orogenesis • Pb and Sm-Nd dates show Grenville basement to E of NY-AL was part of Amazonia, added to proto-Laurentia during Grenville Orogeny • Pb d ...
oceanic ridges
... Another subduction zone—this one with oceanic material on both sides. O-O Modern example of volcanic islands: Japan ...
... Another subduction zone—this one with oceanic material on both sides. O-O Modern example of volcanic islands: Japan ...
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.