Chapter 8
... Plate Tectonics and Metamorphism Higher temperatures and pressures existing at depth within ...
... Plate Tectonics and Metamorphism Higher temperatures and pressures existing at depth within ...
Review of Late Jurassic-early Miocene sedimentation and plate
... Abstract Production of voluminous igneous arc rocks, high-pressure/low-temperature (HP/LT) metamafic rocks, westward relative migration of the Klamath Mountains province, and U–Pb ages of deposition, sediment sources, and spatial locations of Jurassic and younger, detrital zirconbearing clastic rock ...
... Abstract Production of voluminous igneous arc rocks, high-pressure/low-temperature (HP/LT) metamafic rocks, westward relative migration of the Klamath Mountains province, and U–Pb ages of deposition, sediment sources, and spatial locations of Jurassic and younger, detrital zirconbearing clastic rock ...
Barrovian metamorphism in the central Kootenay Arc, British
... These culminations experienced high-grade metamorphism during the Late Cretaceous – Eocene and expose a number of thick top-to-the-east shear zones that were active during this time (Simony and Carr 2011). The area in which the gneiss domes are exposed experienced widespread Eocene extension (Parris ...
... These culminations experienced high-grade metamorphism during the Late Cretaceous – Eocene and expose a number of thick top-to-the-east shear zones that were active during this time (Simony and Carr 2011). The area in which the gneiss domes are exposed experienced widespread Eocene extension (Parris ...
9 Sedimentary, igneous and metamorphic rocks
... running water, the sea or glaciers. That process is called erosion. Deposits of dead plants and animals are also called sediments. Sand deposited by the wind forms sand dunes, especially in coastal areas where sand is picked up and blown inland until it is stopped by obstacles such as rock or vegeta ...
... running water, the sea or glaciers. That process is called erosion. Deposits of dead plants and animals are also called sediments. Sand deposited by the wind forms sand dunes, especially in coastal areas where sand is picked up and blown inland until it is stopped by obstacles such as rock or vegeta ...
The Guerrero Composite Terrane of western Mexico
... interbedded with limestone and shallow-marine volcaniclastic rocks. The Guanajuato and Arcelia Terranes are characterized by Lower Cretaceous supra-subduction ophiolite successions formed by deep-marine volcanic and sedimentary rocks with mid-oceanic-ridge basalt (MORB), oceanic-island basalt (OIB), ...
... interbedded with limestone and shallow-marine volcaniclastic rocks. The Guanajuato and Arcelia Terranes are characterized by Lower Cretaceous supra-subduction ophiolite successions formed by deep-marine volcanic and sedimentary rocks with mid-oceanic-ridge basalt (MORB), oceanic-island basalt (OIB), ...
The tectonic regime along the Andes: Present
... or extensional faults of an earlier tectonic stage (Kley et al. 1999; Ramos 1999) will also exert an important control in the structural style and in localizing Andean deformation. In recent years, the influence of climate has become evident after the proposal of Montgomery et al. (2001), Lamb and D ...
... or extensional faults of an earlier tectonic stage (Kley et al. 1999; Ramos 1999) will also exert an important control in the structural style and in localizing Andean deformation. In recent years, the influence of climate has become evident after the proposal of Montgomery et al. (2001), Lamb and D ...
Exhumation of (ultra-)high-pressure terranes: concepts
... Revised: 7 January 2013 – Accepted: 13 January 2013 – Published: 13 February 2013 ...
... Revised: 7 January 2013 – Accepted: 13 January 2013 – Published: 13 February 2013 ...
Mesozoic fill-sequences in Hefei Basin: Implication for Dabie
... size with the medium sorting and roundness, and the imbricated structure of gravels can be found, reflects deposition of sandy-gravel wandering streams[19]; on the other hand, grey muddy siltstones, interbedded with thin-layer shale and coal bed, occurs at the upper section of J1f1, shows flood plai ...
... size with the medium sorting and roundness, and the imbricated structure of gravels can be found, reflects deposition of sandy-gravel wandering streams[19]; on the other hand, grey muddy siltstones, interbedded with thin-layer shale and coal bed, occurs at the upper section of J1f1, shows flood plai ...
Proterozoic rocks of the Pilar Cliffs, Picuris Mountains, New Mexico
... has been thrust northward over the Hondo Group. The Ortega and Glenwoody Formations belong to the northeast-trending Yavapai-Mazatzal transition zone, and are part of the 1.70-1.69 Ga rhyolite-quartzite association of the Southwest that is thought to have accumulated in volcanic/sedimentary basins o ...
... has been thrust northward over the Hondo Group. The Ortega and Glenwoody Formations belong to the northeast-trending Yavapai-Mazatzal transition zone, and are part of the 1.70-1.69 Ga rhyolite-quartzite association of the Southwest that is thought to have accumulated in volcanic/sedimentary basins o ...
Deep Sea Drilling Project Initial Reports Volume 80
... of the zones recognized geologically and geophysically in northwestern Spain. This interpretation is reinforced by seismic refraction data. Velocities ranging between 5.1 and 5.8 km/s, observed in the interpreted basins, seem to be, as elsewhere in Brittany, characteristic of slightly metamorphosed ...
... of the zones recognized geologically and geophysically in northwestern Spain. This interpretation is reinforced by seismic refraction data. Velocities ranging between 5.1 and 5.8 km/s, observed in the interpreted basins, seem to be, as elsewhere in Brittany, characteristic of slightly metamorphosed ...
- BIROn - Birkbeck Institutional Research Online
... post-collisional tectonic processes. These processes formed extensional basins in response to an interplay of compression and extension within two microplates: ALCAPA and TiszaDacia. Competition between the different tectonic processes at both local and regional scales caused variations in the assoc ...
... post-collisional tectonic processes. These processes formed extensional basins in response to an interplay of compression and extension within two microplates: ALCAPA and TiszaDacia. Competition between the different tectonic processes at both local and regional scales caused variations in the assoc ...
Contractional theory, continental drift and plate tectonics - Perso-sdt
... (1527–1598) stated in 1596 that America was torn off (each reflects the two types of crustal material – from Europe and Africa by earthquakes and floods oceanic and continental; Fig. 1.2), (4) the otherwise The concept that mountain building occurs in phases, which globally act at the same time, was ...
... (1527–1598) stated in 1596 that America was torn off (each reflects the two types of crustal material – from Europe and Africa by earthquakes and floods oceanic and continental; Fig. 1.2), (4) the otherwise The concept that mountain building occurs in phases, which globally act at the same time, was ...
The Red Sea: Birth of an Ocean
... The Afar region is the locus of a “textbook” triple junction, where the East African Rift, the Gulf of Aden Rift, and the Red Sea Rift converge and meet (Fig. 1). The entire region is covered by fissure basalts, scattered central volcanic cones, and major volcanic ranges, located particularly in the ...
... The Afar region is the locus of a “textbook” triple junction, where the East African Rift, the Gulf of Aden Rift, and the Red Sea Rift converge and meet (Fig. 1). The entire region is covered by fissure basalts, scattered central volcanic cones, and major volcanic ranges, located particularly in the ...
Elevated 87Sr/86Sr Ratios From Mafic Intrusions in the Atlanta Lobe
... the granitic rocks, was the realization that rather than being simple crustal melts, most of the granitic rocks formed from - or evolved in close association with - these mafic magmas through complex processes of assimilation, mixing, hybridization, and fractional crystallization. These observations ...
... the granitic rocks, was the realization that rather than being simple crustal melts, most of the granitic rocks formed from - or evolved in close association with - these mafic magmas through complex processes of assimilation, mixing, hybridization, and fractional crystallization. These observations ...
Lawrence University Weeding List 390
... geology of tight gas reservoirs in the pinedale anticline area, Wyoming, and at the multiwall experiment ...
... geology of tight gas reservoirs in the pinedale anticline area, Wyoming, and at the multiwall experiment ...
Time-Space Development of an External Brine
... Volcanic rocks were erupted into the shallow basin, eventually building a topographic high, as shown by (1) interfingering of the lower volcanic flows with the basin margin Boyer Ranch Formation, (2) the presence of rare pillow structures in the lower portions of the volcanic pile and the absence of ...
... Volcanic rocks were erupted into the shallow basin, eventually building a topographic high, as shown by (1) interfingering of the lower volcanic flows with the basin margin Boyer Ranch Formation, (2) the presence of rare pillow structures in the lower portions of the volcanic pile and the absence of ...
Igneous rocks
... • How are igneous rocks formed? • How does magma differ from lava? • What two criteria are used to classify igneous rocks? • How does the rate of cooling of magma influence the crystal size of minerals in igneous rocks? • How is the mineral makeup of an igneous rock related to Bowen’s reaction serie ...
... • How are igneous rocks formed? • How does magma differ from lava? • What two criteria are used to classify igneous rocks? • How does the rate of cooling of magma influence the crystal size of minerals in igneous rocks? • How is the mineral makeup of an igneous rock related to Bowen’s reaction serie ...
rift valley - National Geographic
... thin layer of the Earth that sits beneath ocean basins. supercontinent of all the Earth's landmass that existed about 250 million years ago. piece of land jutting into a body of water. large region that is higher than the surrounding area and relatively flat. movement and interaction of the Earth's ...
... thin layer of the Earth that sits beneath ocean basins. supercontinent of all the Earth's landmass that existed about 250 million years ago. piece of land jutting into a body of water. large region that is higher than the surrounding area and relatively flat. movement and interaction of the Earth's ...
4. Kittitas Valley
... The youngest rocks here are a section of gravel known as the Thorp Formation. The Thorp gravels date from about 4 million years ago, and form a thick belt in the middle portion of the Kittitas Valley. This accumulation broadly dates from the onset of the uplift which has produced the modern Cascade ...
... The youngest rocks here are a section of gravel known as the Thorp Formation. The Thorp gravels date from about 4 million years ago, and form a thick belt in the middle portion of the Kittitas Valley. This accumulation broadly dates from the onset of the uplift which has produced the modern Cascade ...
Email addresses
... The studied area is the northern part of the DAM. The alkaline lamprophyres are camptonites (amphibole rich, plagioclase-bearing) and were collected from Tarnica Complex (Orotva, Tászok, Fülöp, Gudu Creeks), Török and Nagyág Creek. They are dark-grey, greenish-grey mafic rocks showing typical panidi ...
... The studied area is the northern part of the DAM. The alkaline lamprophyres are camptonites (amphibole rich, plagioclase-bearing) and were collected from Tarnica Complex (Orotva, Tászok, Fülöp, Gudu Creeks), Török and Nagyág Creek. They are dark-grey, greenish-grey mafic rocks showing typical panidi ...
Insights into the structure of the upper mantle beneath the Murray
... The east – west cross-sections through the checkerboard inversion model (Figure 6b) generally exhibit good recovery, although there is some smearing of structure towards the edge of the array caused by a predominance of paths with similar orientations. The north – south cross-sections (Figure 6c) al ...
... The east – west cross-sections through the checkerboard inversion model (Figure 6b) generally exhibit good recovery, although there is some smearing of structure towards the edge of the array caused by a predominance of paths with similar orientations. The north – south cross-sections (Figure 6c) al ...
Isostasy and structure of the lower crust and upper mantle in the
... Two Archaean cratons, the Pilbara and Yilgarn Cratons, crop out in Western Australia (Gee, 1979a); their outcrop areas in the northwest part of the State are shown in Figure 1 of Drummond (1981, this issue). Following Gee (1979b), a 'block' is taken as the exposed part of a stabilised 'craton'. Brie ...
... Two Archaean cratons, the Pilbara and Yilgarn Cratons, crop out in Western Australia (Gee, 1979a); their outcrop areas in the northwest part of the State are shown in Figure 1 of Drummond (1981, this issue). Following Gee (1979b), a 'block' is taken as the exposed part of a stabilised 'craton'. Brie ...
Geologic Time - North Coast Distance Education
... conditions to form water, did so in the past under those same conditions.Although scientific explanations have improved and changed over the centuries, natural laws and processes are constant and do not change. All chemical and physical actions and reactions occurring today are produced by the same ...
... conditions to form water, did so in the past under those same conditions.Although scientific explanations have improved and changed over the centuries, natural laws and processes are constant and do not change. All chemical and physical actions and reactions occurring today are produced by the same ...
Document
... composed of tholeiitic basalts and basaltic andesites, including lavas, tuffs, tuffaceous breccias and siltstones; felsic rocks amount to 4%. The total thickness of this sequence varies from 3 to 7 km. The volcanic and sedimentary rocks were deposited on an uplift bordered by marine troughs like the ...
... composed of tholeiitic basalts and basaltic andesites, including lavas, tuffs, tuffaceous breccias and siltstones; felsic rocks amount to 4%. The total thickness of this sequence varies from 3 to 7 km. The volcanic and sedimentary rocks were deposited on an uplift bordered by marine troughs like the ...
THE UPPER MANTLE AND ALKALIC MAGMAS
... bodies or similar rocks ( PECORA & HEARN 1965) for their possible derivation from depth. Attention may be drawn to the 'ultrabasic facies' ( BROGGER 1933) of roe� somewhat 'floating' in the voluminous syenitic members in the alkalic province of Oslo, South Norway. Though the exact genetic relation o ...
... bodies or similar rocks ( PECORA & HEARN 1965) for their possible derivation from depth. Attention may be drawn to the 'ultrabasic facies' ( BROGGER 1933) of roe� somewhat 'floating' in the voluminous syenitic members in the alkalic province of Oslo, South Norway. Though the exact genetic relation o ...
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.