Convergent Plates - Earthquake Explorers
... 1. What type of tectonic plate boundary is found where the Nazca plate meets the South American plate? (i.e. name the boundary type) ______________________________________________________________ 2. What type of crustal material is present in the (i.e. oceanic or continental): (a) Nazca plate: _____ ...
... 1. What type of tectonic plate boundary is found where the Nazca plate meets the South American plate? (i.e. name the boundary type) ______________________________________________________________ 2. What type of crustal material is present in the (i.e. oceanic or continental): (a) Nazca plate: _____ ...
Tectonic reconstruction of Uda-Murgal arc and the Late
... Between the Verkhoyansk-Chukotka and KoryakKamchatka fold and thrust belts there is a structural domain called by Markov (1975) “the Western Koryak fold and thrust belt” that was formed in Late Mesozoic (Fig. 1). He described this belt as a tectonic element of the same importance as the Verkhoyansk- ...
... Between the Verkhoyansk-Chukotka and KoryakKamchatka fold and thrust belts there is a structural domain called by Markov (1975) “the Western Koryak fold and thrust belt” that was formed in Late Mesozoic (Fig. 1). He described this belt as a tectonic element of the same importance as the Verkhoyansk- ...
A Short Geological History of Lanark County
... tropical reefs formed, and thick deposits of salt formed when the seas evaporated. The geological record of this time period can be found in the bedrock of southwestern ...
... tropical reefs formed, and thick deposits of salt formed when the seas evaporated. The geological record of this time period can be found in the bedrock of southwestern ...
chapter9_Proterozoic..
... sutured together by continental accretion along their margins creating a large landmass known as Laurentia. Laurentia included part of North America and Greenland. ...
... sutured together by continental accretion along their margins creating a large landmass known as Laurentia. Laurentia included part of North America and Greenland. ...
on April 6, 2015 gsabulletin.gsapubs.org Downloaded from
... Felsch (unpub. data, 1936) and later Briig- series of volcanic debris of probable Quaternary gen (1950) described, in general terms, the age. structural components of the valley, mainly on Only recently, however, with the work of the basis of geomorphic evidence in the vicinity Thomas (1958), Aguirr ...
... Felsch (unpub. data, 1936) and later Briig- series of volcanic debris of probable Quaternary gen (1950) described, in general terms, the age. structural components of the valley, mainly on Only recently, however, with the work of the basis of geomorphic evidence in the vicinity Thomas (1958), Aguirr ...
chapter9
... • a long narrow continental trough bounded by faults, • extending from the Lake Superior basin southwest into Kansas, • and a southeasterly branch extends through Michigan into Ohio ...
... • a long narrow continental trough bounded by faults, • extending from the Lake Superior basin southwest into Kansas, • and a southeasterly branch extends through Michigan into Ohio ...
Sample pages 2 PDF
... Zone, forming broad plutonic blooms rather than arc trench-type linear belts (Frost et al. 2006; Mueller and Frost 2006). Evidence of modern-style lateral accretion and arc magmatism is suggested at 2.67–2.63 Ga in the southern part of the craton. Possible geophysical evidence for buried equivalents ...
... Zone, forming broad plutonic blooms rather than arc trench-type linear belts (Frost et al. 2006; Mueller and Frost 2006). Evidence of modern-style lateral accretion and arc magmatism is suggested at 2.67–2.63 Ga in the southern part of the craton. Possible geophysical evidence for buried equivalents ...
Section 2 The Theory of Plate Tectonics
... boundary. Some divergent boundaries appear on land, such as in Iceland and eastern Africa. However, most divergent boundaries happen on the sea floor. These boundaries are characterized by mid-ocean ridges. As the plates pull away from each other, fractures form in the oceanic lithosphere. Magma ris ...
... boundary. Some divergent boundaries appear on land, such as in Iceland and eastern Africa. However, most divergent boundaries happen on the sea floor. These boundaries are characterized by mid-ocean ridges. As the plates pull away from each other, fractures form in the oceanic lithosphere. Magma ris ...
Metamorphic Rock Notes
... – Occurs adjacent to magma bodies intruding cooler country rock – Occurs in narrow zone (~1-100 m wide) known as contact aureole – Rocks may be fine- (e.g., hornfels) or coarse-grained (e.g., marble, quartzite) ...
... – Occurs adjacent to magma bodies intruding cooler country rock – Occurs in narrow zone (~1-100 m wide) known as contact aureole – Rocks may be fine- (e.g., hornfels) or coarse-grained (e.g., marble, quartzite) ...
Landforms
... The Andes Mountains began forming during the Jurrasic period (~200 mya) when plate tectonics forced the oceanic Nazca plate to subduct beneath the continental South American plate. The subduction zone between the plate margins marks the Peru-Chile ocean trench which is 26,500 ft (8,065 meters) below ...
... The Andes Mountains began forming during the Jurrasic period (~200 mya) when plate tectonics forced the oceanic Nazca plate to subduct beneath the continental South American plate. The subduction zone between the plate margins marks the Peru-Chile ocean trench which is 26,500 ft (8,065 meters) below ...
Zircon U-Pb grain ages clustering at several ages between 92 and
... consistent with derivation from muscovitedehydration melting of underlying Neoproterozoic pelitic rocks (Lee et al., 2003). ...
... consistent with derivation from muscovitedehydration melting of underlying Neoproterozoic pelitic rocks (Lee et al., 2003). ...
tertiary rocks - Geologic Trips
... were carried into the Great Valley, where they formed thick layers of sedimentary rocks that now underlie much of the Great Valley. By Eocene time, uplift of the ancestral Sierra had slowed down. However, erosion continued, and the ancestral mountains were deeply eroded to form a low range of hills ...
... were carried into the Great Valley, where they formed thick layers of sedimentary rocks that now underlie much of the Great Valley. By Eocene time, uplift of the ancestral Sierra had slowed down. However, erosion continued, and the ancestral mountains were deeply eroded to form a low range of hills ...
Seismic Investigation of the Yavapai-Mazatzal Transition Zone
... Laramide tectonism during the Cretaceous-Paleogene (75–45 ...
... Laramide tectonism during the Cretaceous-Paleogene (75–45 ...
The tonalite–trondhjemite–granodiorite (TTG)
... gneiss forms small pods throughout the western Owl Creek Mountains. It is fine grained and strongly foliated. The gneisses have been metamorphosed at amphibolite facies but contain relict tabular plagioclase indicative of their igneous origin. Locally the gneisses are cut by millimetre-wide greensch ...
... gneiss forms small pods throughout the western Owl Creek Mountains. It is fine grained and strongly foliated. The gneisses have been metamorphosed at amphibolite facies but contain relict tabular plagioclase indicative of their igneous origin. Locally the gneisses are cut by millimetre-wide greensch ...
Rock Identification - Faculty Server Contact
... The earth is a very dynamic body and rock material is continually recycled. Plate tectonics is the description of this dynamic process. New material rising from deep in the mantle of the earth is added to the crust of the earth along mid-ocean ridge systems and crust is returned to the mantle at sub ...
... The earth is a very dynamic body and rock material is continually recycled. Plate tectonics is the description of this dynamic process. New material rising from deep in the mantle of the earth is added to the crust of the earth along mid-ocean ridge systems and crust is returned to the mantle at sub ...
File
... The collision between the Indian and Eurasian plates has pushed up the Himalayas and the Tibetan Plateau. The cross sections show the evolution of the Himalayas and the displacement of slivers of continental crust during this collision. The reference points (small squares) show the amount of uplift ...
... The collision between the Indian and Eurasian plates has pushed up the Himalayas and the Tibetan Plateau. The cross sections show the evolution of the Himalayas and the displacement of slivers of continental crust during this collision. The reference points (small squares) show the amount of uplift ...
Metamorphic Petrology GLY 262 Lecture 1:An introduction to
... • Metamorphic facies are defined via a characteristic mineral assemablage rather than a single index mineral. • Eskola further deduced that (a) rocks formed at higher pressures will tend to contain denser minerals than rocks of the same composition at lower pressure; and (b) devolatilsation reaction ...
... • Metamorphic facies are defined via a characteristic mineral assemablage rather than a single index mineral. • Eskola further deduced that (a) rocks formed at higher pressures will tend to contain denser minerals than rocks of the same composition at lower pressure; and (b) devolatilsation reaction ...
Thermo-rheological, shear heating model for leucogranite
... thrust over the Archean Wyoming province during the Trans-Hudson collision. Isotopic compositions of the Harney Peak Granite suggest that the exposed Proterozoic and Archean metasedimentary rocks in the Black Hills represent source rocks of the granites. Numerical simulations of the regional metamor ...
... thrust over the Archean Wyoming province during the Trans-Hudson collision. Isotopic compositions of the Harney Peak Granite suggest that the exposed Proterozoic and Archean metasedimentary rocks in the Black Hills represent source rocks of the granites. Numerical simulations of the regional metamor ...
Secular Variation in the Composition of the Subcontinental
... The Archean-Proterozoic boundary represents a major change in the processes that form continental lithospheric mantle; since 2.5 Ga there has been a pronounced, but more gradual, secular change in the nature of these processes. Actualistic models of lithosphere formation based on modern processes ma ...
... The Archean-Proterozoic boundary represents a major change in the processes that form continental lithospheric mantle; since 2.5 Ga there has been a pronounced, but more gradual, secular change in the nature of these processes. Actualistic models of lithosphere formation based on modern processes ma ...
evidence of neoproterozoic backarc basin development in the
... Açungui Group, Lajeado Subgroup (Campanha 1991). It was only slightly affected by Brasiliano metamorphism, hence preserves a geochemistry revealing an original magmatic liquid with a saturated tholeitic character, whose ETR patterns present a sub-horizontal alignment corresponding to oceanic basalts ...
... Açungui Group, Lajeado Subgroup (Campanha 1991). It was only slightly affected by Brasiliano metamorphism, hence preserves a geochemistry revealing an original magmatic liquid with a saturated tholeitic character, whose ETR patterns present a sub-horizontal alignment corresponding to oceanic basalts ...
Earthquakes
... There are many different types of earthquakes: tectonic, volcanic, and explosion. The type of earthquake depends on the region where it occurs and the geological make-up of that region. Tectonic earthquakes are the most common. These occur when rocks in the earth's crust break due to geological forc ...
... There are many different types of earthquakes: tectonic, volcanic, and explosion. The type of earthquake depends on the region where it occurs and the geological make-up of that region. Tectonic earthquakes are the most common. These occur when rocks in the earth's crust break due to geological forc ...
pdf file - Pacific Northwest Geodetic Array
... Please send your comments and/or additions to this draft! RATIONALE Subduction zones are the most dynamic tectonic environments on earth. The fastest relative plate motions and the highest mass fluxes of sediment, magma, and related fluids into the continental crust and mantle occur at subduction zo ...
... Please send your comments and/or additions to this draft! RATIONALE Subduction zones are the most dynamic tectonic environments on earth. The fastest relative plate motions and the highest mass fluxes of sediment, magma, and related fluids into the continental crust and mantle occur at subduction zo ...
Quantitative Geomorphology in Neotectonics Interpretation
... Based on geomorphic indices, DEM and remote sensing data it is now possible to delineate neotectonic structures and work out the kinematics of neotectonic deformation, including the reactivation pattern of older structures. The importance and application of quantitative geomorphology in understandi ...
... Based on geomorphic indices, DEM and remote sensing data it is now possible to delineate neotectonic structures and work out the kinematics of neotectonic deformation, including the reactivation pattern of older structures. The importance and application of quantitative geomorphology in understandi ...
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.