structural framework and tectonic evolution of the four corners region
... indicative of right shift along the monocline (Kelley, 1967), which is the same sense of shift as along the eastern margin of the Colorado Plateau (fig. 2). Thus, northeasterly oriented compression during Laramide time resulted in shift of the plateau toward the north and the east and caused the mon ...
... indicative of right shift along the monocline (Kelley, 1967), which is the same sense of shift as along the eastern margin of the Colorado Plateau (fig. 2). Thus, northeasterly oriented compression during Laramide time resulted in shift of the plateau toward the north and the east and caused the mon ...
Seismic reflection image of the Great Sumatra
... subduction event in the last 50 years. The rupture initiated at 30-40 km depth northwest of Simeulue Island1 and propagated for ~1300 km to the northern Andaman Islands2. The earthquake was caused by a sudden slip along the interplate boundary between the subducting Indo-Australian plate and overrid ...
... subduction event in the last 50 years. The rupture initiated at 30-40 km depth northwest of Simeulue Island1 and propagated for ~1300 km to the northern Andaman Islands2. The earthquake was caused by a sudden slip along the interplate boundary between the subducting Indo-Australian plate and overrid ...
Plate Tectonic Constraints on the Biogeography of Middle America
... northeasternand southeasternMexico and into Guatemala. Widespread continentality there was no Gulf of Mexico or Caribbean Sea. In Late Triassic time and continuinginto Early Jurassic time this constructbegan to founderby initialriftingbetween South America-Africaand NorthAmerica. No oceanic crust wa ...
... northeasternand southeasternMexico and into Guatemala. Widespread continentality there was no Gulf of Mexico or Caribbean Sea. In Late Triassic time and continuinginto Early Jurassic time this constructbegan to founderby initialriftingbetween South America-Africaand NorthAmerica. No oceanic crust wa ...
Seismological observations in Northwestern South America
... The cause of tectonic deformation in northwestern South America and its link to upper mantle structure and flow are debated. We use a combination of broadband and short period travel time seismic data for P-waves to show that observations are consistent with the presence of two subduction segments in ...
... The cause of tectonic deformation in northwestern South America and its link to upper mantle structure and flow are debated. We use a combination of broadband and short period travel time seismic data for P-waves to show that observations are consistent with the presence of two subduction segments in ...
Essentials of Geology, 3rd edition
... Added to the overriding plate. Called exotic terranes – Geologic history differs from surroundings. ...
... Added to the overriding plate. Called exotic terranes – Geologic history differs from surroundings. ...
The north Pyrenean Front and related foreland basin along the Bay
... bounded southwards by a major north-dipping planar fault with a normal displacement of near 15 km. It is filled up by a thick (up to 10 km) sequence of Jurassicupper Cretaceous carbonates affected by salt domes and diapirs of Triassic evaporites and mudstones. These salt tectonic structures grew dur ...
... bounded southwards by a major north-dipping planar fault with a normal displacement of near 15 km. It is filled up by a thick (up to 10 km) sequence of Jurassicupper Cretaceous carbonates affected by salt domes and diapirs of Triassic evaporites and mudstones. These salt tectonic structures grew dur ...
Seafloor massive sulfide - International Seabed Authority
... precipitated at and near the sea floor when submarine volcanic hot-spring fluids (250-350ºC) mix with cold seawater, typically at depths of 10003000m. High pressure inhibits boiling. The process is inefficient, creating buoyant “smoke” laced with fine mineral particles. The structures formed on the ...
... precipitated at and near the sea floor when submarine volcanic hot-spring fluids (250-350ºC) mix with cold seawater, typically at depths of 10003000m. High pressure inhibits boiling. The process is inefficient, creating buoyant “smoke” laced with fine mineral particles. The structures formed on the ...
Southwest U.S. Region Mountain
... It extended from todays Juan de Fuca Plate on the north through the Cocos Plate on the south Its subduction built most of the North American Cordillera, bunching up the west end of the North American plate like folds It is also the origin of the Sierra Nevada Batholith via subduction under North Ame ...
... It extended from todays Juan de Fuca Plate on the north through the Cocos Plate on the south Its subduction built most of the North American Cordillera, bunching up the west end of the North American plate like folds It is also the origin of the Sierra Nevada Batholith via subduction under North Ame ...
The reflection seismic survey of project TIPTEQ—the inventory of the
... thus inducing a strong impedance contrast. An additional process leading to high reflectivity may be the dewatering of sediments carried down in the subduction channel and the migration of fluids into the continental crust. Currently the thickness of the subducting sediments is 2.2 km at the trench ...
... thus inducing a strong impedance contrast. An additional process leading to high reflectivity may be the dewatering of sediments carried down in the subduction channel and the migration of fluids into the continental crust. Currently the thickness of the subducting sediments is 2.2 km at the trench ...
Data Collection: Recording Metamorphism and Lithology at the
... result was a major mountain-building event that occurred due to the collision of the Laurentian and South American plate. That long lived event was the Grenville Orogeny. A field study was organized to collect and catalog data pertaining to the country rock and metamorphic composition as well as the ...
... result was a major mountain-building event that occurred due to the collision of the Laurentian and South American plate. That long lived event was the Grenville Orogeny. A field study was organized to collect and catalog data pertaining to the country rock and metamorphic composition as well as the ...
Forced fords and thrust belt machanics
... cool stuff! Please review map symbols and bring stereonets. We may return after sunset. There will be a "What is it" quiz next lecture- review fault rocks and kinematic indicators! Nov. 13 - Draft #1 of fault paper due! ...
... cool stuff! Please review map symbols and bring stereonets. We may return after sunset. There will be a "What is it" quiz next lecture- review fault rocks and kinematic indicators! Nov. 13 - Draft #1 of fault paper due! ...
Abstract This study focuses on Upper Cretaceous sandstones of the
... sandstones in relation to the Post-Archean Australian Shale (PAAS), which are considered to be representative of the upper continental crust, show that the recycling processes in their source areas were probably less intense than those of the PAAS. SiO2/Al2O3 (3.2-7.9) and K2O/Na2O (0.3-1) ratios, t ...
... sandstones in relation to the Post-Archean Australian Shale (PAAS), which are considered to be representative of the upper continental crust, show that the recycling processes in their source areas were probably less intense than those of the PAAS. SiO2/Al2O3 (3.2-7.9) and K2O/Na2O (0.3-1) ratios, t ...
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... in the past one million years, a result which is Similar to that of Chase etal. (1975). However, to the north of it (the Explorer plate) convergence at the margin has decreased to a greater extent, from 5.5 cmlyrto about 2.0 cmlyr (perpendicular subduction rate of 1.4 cmlyr) in the same period (Fig. ...
... in the past one million years, a result which is Similar to that of Chase etal. (1975). However, to the north of it (the Explorer plate) convergence at the margin has decreased to a greater extent, from 5.5 cmlyrto about 2.0 cmlyr (perpendicular subduction rate of 1.4 cmlyr) in the same period (Fig. ...
Structure of the Lithosphere and the Sedimentary Record: Where do
... Embayment is quite different from N.J. and requires several tectonic events, including a long-term subsidence event in the mid to Late Miocene. The center of the Eocene impact crater is showing the opposite sense of motion, suggesting an in-plane stress event. Besides the subducted Farallon slab are ...
... Embayment is quite different from N.J. and requires several tectonic events, including a long-term subsidence event in the mid to Late Miocene. The center of the Eocene impact crater is showing the opposite sense of motion, suggesting an in-plane stress event. Besides the subducted Farallon slab are ...
Abstract
... range in grade from greenschist to upper amphibolite facies. A pervasive layer-parallel fabric is indicative of north-verging tectonic transport, overprinted by a fabric associated with regional shear zones with a south-verging sense of transport. Late normal and strike-slip faults are present in th ...
... range in grade from greenschist to upper amphibolite facies. A pervasive layer-parallel fabric is indicative of north-verging tectonic transport, overprinted by a fabric associated with regional shear zones with a south-verging sense of transport. Late normal and strike-slip faults are present in th ...
A three-dimensional model of seismic velocities beneath northern
... RESULTS OF THE l-D AND 3-D INVERSIONS The obtained minumum l-D model with average station residual reflects the extremely thickened crust in the Central Andes. Typical subcrustal velocities of nearly 8 km/s are reached only beneath 70 km depth. Normal upper crust and middle crust velocities can be s ...
... RESULTS OF THE l-D AND 3-D INVERSIONS The obtained minumum l-D model with average station residual reflects the extremely thickened crust in the Central Andes. Typical subcrustal velocities of nearly 8 km/s are reached only beneath 70 km depth. Normal upper crust and middle crust velocities can be s ...
amphibious experiments spoc (subduction processes off chile)
... The first component of the study, the ship-borne integrated geophysical experiment SPOC with R/V SONNE, took place in fall and winter 2001/2002 (operated by The Federal Institute for Geosciences and Natural Resources, in cooperation with GEOMAR and the Berlin-Potsdam Andes research group, SFB 267). ...
... The first component of the study, the ship-borne integrated geophysical experiment SPOC with R/V SONNE, took place in fall and winter 2001/2002 (operated by The Federal Institute for Geosciences and Natural Resources, in cooperation with GEOMAR and the Berlin-Potsdam Andes research group, SFB 267). ...
Continental collision and the tectono-sedimentary
... et al. present a modeling study of the deformation field associated with oblique continental collision, a situation common in several orogens. A wide set of papers was dedicated to the Carpathians and their foreland demonstrating how the interest in this part of the world is very strong with new ide ...
... et al. present a modeling study of the deformation field associated with oblique continental collision, a situation common in several orogens. A wide set of papers was dedicated to the Carpathians and their foreland demonstrating how the interest in this part of the world is very strong with new ide ...
Tectonic setting of Late Cretaceous gold and mercury
... Southwestern Alaska is underlain by a variety of Jurassic and older terranes that were assembled by mid-Cretaceous time and overlapped by Upper Cretaceous flysch (Decker and others, 1994). The older terranes include Paleoproterozoic metamorphic rocks (e.g. Kilbuck terrane), a Neoproterozoic to Juras ...
... Southwestern Alaska is underlain by a variety of Jurassic and older terranes that were assembled by mid-Cretaceous time and overlapped by Upper Cretaceous flysch (Decker and others, 1994). The older terranes include Paleoproterozoic metamorphic rocks (e.g. Kilbuck terrane), a Neoproterozoic to Juras ...
Crustal Deformation and Mountain Building - e
... 37. Terranes are relatively small crustal fragments (microcontinents, volcanic island arcs, or oceanic plateaus). Terranes may be accreted to continents when subduction brings them to a trench, but they cannot subduct due to their relatively low density. The terranes are "peeled off" the subducted s ...
... 37. Terranes are relatively small crustal fragments (microcontinents, volcanic island arcs, or oceanic plateaus). Terranes may be accreted to continents when subduction brings them to a trench, but they cannot subduct due to their relatively low density. The terranes are "peeled off" the subducted s ...
Seismic re¯ection image revealing offset of Andean subduction
... NATURE | VOL 397 | 28 JANUARY 1999 | www.nature.com ...
... NATURE | VOL 397 | 28 JANUARY 1999 | www.nature.com ...
Mesozoic extensional and strike-slip fault systems in magmatic arc
... Plutonic rocks no\. exposed in the h4iddle Jurassic to Early Cretaceous magmatic arc of northern Chile were empIaced between c. 153 Ma and c. 126 Ma at high levels in the crust - above the regional ductilebrittle transition. This is known because of the concordance of mineral and whole-rock cooling ...
... Plutonic rocks no\. exposed in the h4iddle Jurassic to Early Cretaceous magmatic arc of northern Chile were empIaced between c. 153 Ma and c. 126 Ma at high levels in the crust - above the regional ductilebrittle transition. This is known because of the concordance of mineral and whole-rock cooling ...
Intra-Panthalassa Ocean subduction zones revealed by fossil arcs
... exotic terranes with intra-Panthalassa volcanic arc remnants of Triassic–Jurassic age are the Kolyma–Omolon superterrane (northeast Asia)4,14,15 , the Anadyr–Koryak terrane (east Asia)4,16,17 , the Oku–Niikappu terrane (Japan)13 and the Wrangellia and Stikinia terranes (western North America)4,18 (F ...
... exotic terranes with intra-Panthalassa volcanic arc remnants of Triassic–Jurassic age are the Kolyma–Omolon superterrane (northeast Asia)4,14,15 , the Anadyr–Koryak terrane (east Asia)4,16,17 , the Oku–Niikappu terrane (Japan)13 and the Wrangellia and Stikinia terranes (western North America)4,18 (F ...
Measuring earthquake and volcano activity from space
... circular patterns in the inserts show volcanic deformation farther inland [Source: Matt Prichard http://www.unavco.org/edu_outreach/highlights/2006/insar06/insar06.html] ...
... circular patterns in the inserts show volcanic deformation farther inland [Source: Matt Prichard http://www.unavco.org/edu_outreach/highlights/2006/insar06/insar06.html] ...