between Earth Expansion and Seafloor Spreading
... In this alternate model based on King, expansion tectonics is divorced from seafloor spreading and wed to oceanization, but only on its own terms and in a much narrower sense. Indeed, this expansion model explains how and why oceanization was triggered in the first place. As the Earth expanded – whi ...
... In this alternate model based on King, expansion tectonics is divorced from seafloor spreading and wed to oceanization, but only on its own terms and in a much narrower sense. Indeed, this expansion model explains how and why oceanization was triggered in the first place. As the Earth expanded – whi ...
Late Cenozoic denudation and uplift rates in the Santa Lucia
... 0.06 mm/yr, for the period 6.1–2.3 Ma. Analytical errors were included in the regression. The helium data may also be used to determine the more recent exhumation history of the region. If a geothermal gradient of 25 °C/km and a mean annual surface temperature of 10 °C are assumed, the helium closur ...
... 0.06 mm/yr, for the period 6.1–2.3 Ma. Analytical errors were included in the regression. The helium data may also be used to determine the more recent exhumation history of the region. If a geothermal gradient of 25 °C/km and a mean annual surface temperature of 10 °C are assumed, the helium closur ...
The American Cordillera: Part III, The North American Taphrogen
... Campanian—Maastrichtian time. This extension produced no known surface-breaking faults, and may have been restricted to mid-crustal rocks. Coeval with extension in the hinterland region, major thinskinned thrust systems propagated eastward into Wyoming in the frontal Sevier belt. The contemporaneity ...
... Campanian—Maastrichtian time. This extension produced no known surface-breaking faults, and may have been restricted to mid-crustal rocks. Coeval with extension in the hinterland region, major thinskinned thrust systems propagated eastward into Wyoming in the frontal Sevier belt. The contemporaneity ...
Deformation of the Continental Crust
... Deformation of continental crust • Since continents are not destroyed by subduction, we look here for the ancient history of Earth. • orogeny: sum of the tectonic forces (i.e., deformation, magmatism, metamorphism, erosion) that produce mountain belts ...
... Deformation of continental crust • Since continents are not destroyed by subduction, we look here for the ancient history of Earth. • orogeny: sum of the tectonic forces (i.e., deformation, magmatism, metamorphism, erosion) that produce mountain belts ...
Notes and Discussions RICHARD H. SILLITOE Institute de
... It is proposed that post-Paleozoic metal provinces in western North and South America are related to subduction zones which were active beneath the western American continental margin at times during the Mesozoic and early and middle Cenozoic (for example, Atwater, 1970; Hamilton, 1969), and that ar ...
... It is proposed that post-Paleozoic metal provinces in western North and South America are related to subduction zones which were active beneath the western American continental margin at times during the Mesozoic and early and middle Cenozoic (for example, Atwater, 1970; Hamilton, 1969), and that ar ...
Geological Society of America Bulletin
... gently inclined segment of the Cocos plate bounded by the Rivera transform and the Tehuantepec Ridge. Major volcanic edifices possess summit elevations in the range 4,000 to 6,000 m, have appropriately larger volumes (typically >200 km 3 ) and are constructed with a high proportion of amphibole-bear ...
... gently inclined segment of the Cocos plate bounded by the Rivera transform and the Tehuantepec Ridge. Major volcanic edifices possess summit elevations in the range 4,000 to 6,000 m, have appropriately larger volumes (typically >200 km 3 ) and are constructed with a high proportion of amphibole-bear ...
The continent/island-arc collision in northern Papua
... The central orogenic belt, or New Guinea Mobile Belt Dow and others, 1972; (Bain, 1973; Bain and others, 1975; Dow, 1976), lies to the north and east of the Southwest Papuan PI at fo nn , and extends from the Owen Stanley Ranges of the Papuan Peninsula through the Papua New Guinea Highlands (Fig. 1) ...
... The central orogenic belt, or New Guinea Mobile Belt Dow and others, 1972; (Bain, 1973; Bain and others, 1975; Dow, 1976), lies to the north and east of the Southwest Papuan PI at fo nn , and extends from the Owen Stanley Ranges of the Papuan Peninsula through the Papua New Guinea Highlands (Fig. 1) ...
Travel Time Tomographic Imaging of Shallow Fore
... fore-arc basin structure at the Cascadia subduction zone using first-arrival travel times from two multichannel seismic (MCS) profiles acquired with an 8-km long streamer in the frame of the 2012 Cascadia Ridge to trench program. The first profile extends offshore Gray’s Harbor in Washington and the ...
... fore-arc basin structure at the Cascadia subduction zone using first-arrival travel times from two multichannel seismic (MCS) profiles acquired with an 8-km long streamer in the frame of the 2012 Cascadia Ridge to trench program. The first profile extends offshore Gray’s Harbor in Washington and the ...
Regional Tectonics of South
... orogenic belt on the east is characterized by several large open folds along its western escarpment (Pray, 1949, p. 58-59) . The San Andres range, the largest of the uplifts, is in general the simplest and most uniform in its deformation over large areas. Dips throughout much of its length are rarel ...
... orogenic belt on the east is characterized by several large open folds along its western escarpment (Pray, 1949, p. 58-59) . The San Andres range, the largest of the uplifts, is in general the simplest and most uniform in its deformation over large areas. Dips throughout much of its length are rarel ...
Origin and time evolution of subduction polarity reversal from plate
... putatively driven by eastward rollback of the Izanagi slab (Zhou and Li, 2000). Widespread tectonic subsidence reached as far east as the East China Sea at 65 Ma (Yang et al., 2004), while also affecting the Taiwan region (Lin et al., 2003). Extension in south and east China resulted in opening of t ...
... putatively driven by eastward rollback of the Izanagi slab (Zhou and Li, 2000). Widespread tectonic subsidence reached as far east as the East China Sea at 65 Ma (Yang et al., 2004), while also affecting the Taiwan region (Lin et al., 2003). Extension in south and east China resulted in opening of t ...
How do subduction processes contribute to forearc - HAL-Insu
... (~37.5°S) does not correspond to any subducting ridge. Melnick et al. (2009) show this uplift may result from N-S continental shortening resulting from the Northward motion of the Chiloe forearc sliver. In fact, it has been noted that peninsulas generally correspond to particular places in which cru ...
... (~37.5°S) does not correspond to any subducting ridge. Melnick et al. (2009) show this uplift may result from N-S continental shortening resulting from the Northward motion of the Chiloe forearc sliver. In fact, it has been noted that peninsulas generally correspond to particular places in which cru ...
BASIN TYPES ACCORDING TO TECTONIC by Prof. Dr. Abbas
... Epicratonic basins • By contrast with the previous, two examples, the Sirte basin was predominantly a site of carbonate sedimentation. Basal sands and thin evaporites are overlain by deep-water Upper Cretaceous and Palaeocene shales. These are thickest in intrabasinal troughs, while reefal carbonat ...
... Epicratonic basins • By contrast with the previous, two examples, the Sirte basin was predominantly a site of carbonate sedimentation. Basal sands and thin evaporites are overlain by deep-water Upper Cretaceous and Palaeocene shales. These are thickest in intrabasinal troughs, while reefal carbonat ...
Thermal modelling of the Laramide orogeny: testing the £at
... dynamics that this point is inconclusive. If frictional heating along the subduction interface, and/or a non-linear mantle wedge rheology are used in these models (e.g. [24]), the mantle wedge and subducting slab will be hotter, such that slab dehydration will occur at shallower depths, and inboard ...
... dynamics that this point is inconclusive. If frictional heating along the subduction interface, and/or a non-linear mantle wedge rheology are used in these models (e.g. [24]), the mantle wedge and subducting slab will be hotter, such that slab dehydration will occur at shallower depths, and inboard ...
The Aegean: plate tectonic evolution in Mediterranean
... South of the Pre-Apulian zone, a new plate boundary was created in the Mid-Cretaceous, which marked a main change. Resulting from this boundary a new ocean basin, called Proto-Mediterranean began to develop. As there was hardly any change in the positions of Eurasia and Africa the Tethys Ocean basin ...
... South of the Pre-Apulian zone, a new plate boundary was created in the Mid-Cretaceous, which marked a main change. Resulting from this boundary a new ocean basin, called Proto-Mediterranean began to develop. As there was hardly any change in the positions of Eurasia and Africa the Tethys Ocean basin ...
4. Structure of the Peru Forearc from Multichannel Seismic
... tectonic features of the Yaquina Basin region. The thin (approximately 100 m), hemipelagic, sediment cover on the Nazca Plate is onlapped by 350 to 400 ms of horizontally stratified trench sediment, forming a 3-km-wide trench. Seabeam bathymetric data across the trench in this area (Bourgois et al., ...
... tectonic features of the Yaquina Basin region. The thin (approximately 100 m), hemipelagic, sediment cover on the Nazca Plate is onlapped by 350 to 400 ms of horizontally stratified trench sediment, forming a 3-km-wide trench. Seabeam bathymetric data across the trench in this area (Bourgois et al., ...
Historical Geology
... --deforms rock by causing one part of a rock mass to slide past another B. Strain 1. the distortion or deformation that results from stress 2. rocks can respond to tectonic stress in 3 different ways a. elastic strain--directly proportional to the amount of stress: return to shape b. non-elastic str ...
... --deforms rock by causing one part of a rock mass to slide past another B. Strain 1. the distortion or deformation that results from stress 2. rocks can respond to tectonic stress in 3 different ways a. elastic strain--directly proportional to the amount of stress: return to shape b. non-elastic str ...
Slab flattening trigger for isotopic disturbance and magmatic flare
... basin material (e.g., Saleeby, 2003). These subduction accretion assemblages, known locally as the Pelona-Orocopia-Rand schist (Jacobson et al., 2011), lie in fault contact beneath the SNB and its pre-intrusive framework (Fig. 1). Exposures of these rocks in the San Emigdio Mountains (the “San Emigd ...
... basin material (e.g., Saleeby, 2003). These subduction accretion assemblages, known locally as the Pelona-Orocopia-Rand schist (Jacobson et al., 2011), lie in fault contact beneath the SNB and its pre-intrusive framework (Fig. 1). Exposures of these rocks in the San Emigdio Mountains (the “San Emigd ...
as a PDF
... orogenic belt on the east is characterized by several large open folds along its western escarpment (Pray, 1949, p. 58-59) . The San Andres range, the largest of the uplifts, is in general the simplest and most uniform in its deformation over large areas. Dips throughout much of its length are rarel ...
... orogenic belt on the east is characterized by several large open folds along its western escarpment (Pray, 1949, p. 58-59) . The San Andres range, the largest of the uplifts, is in general the simplest and most uniform in its deformation over large areas. Dips throughout much of its length are rarel ...
Plateau uplift in western Canada caused by lithospheric
... crust beneath the plateau region. We identify a 250-km-wide seismic anomaly about 150–250 km beneath the plateau that we interpret as a block of intact, delaminated lithosphere. We suggest that mantle material upwelling along the sharp craton edge9 triggered large-scale delamination of the lithosphe ...
... crust beneath the plateau region. We identify a 250-km-wide seismic anomaly about 150–250 km beneath the plateau that we interpret as a block of intact, delaminated lithosphere. We suggest that mantle material upwelling along the sharp craton edge9 triggered large-scale delamination of the lithosphe ...
"lost Inca Plateau": cause of flat subduction - Archimer
... the well established general picture of a flat dipping slab and associated volcanic gap from 2°S to 15°S [1-3]. Steep slab segments in S. Ecuador and S. Peru, with their associated arc volcanism are seen at the northern and southern ends, respectively, of this section. The relative high in the Nazca ...
... the well established general picture of a flat dipping slab and associated volcanic gap from 2°S to 15°S [1-3]. Steep slab segments in S. Ecuador and S. Peru, with their associated arc volcanism are seen at the northern and southern ends, respectively, of this section. The relative high in the Nazca ...
CHAPTER 7 - SYNTHESIS
... geological evolution of the Iberian Peninsula reveals several stages of increased tectonic activity interrupted by periods of tectonic quiescence. In general, the Iberian Peninsula is going through a tectonically very active period since opening of the Mid-Atlantic Ocean started. After a long period ...
... geological evolution of the Iberian Peninsula reveals several stages of increased tectonic activity interrupted by periods of tectonic quiescence. In general, the Iberian Peninsula is going through a tectonically very active period since opening of the Mid-Atlantic Ocean started. After a long period ...
7 Volcano-tectonic Interactions in Kyushu and Implications for Future
... Many previous workers have noted that most of the arc volcanoes in Kyushu (with the exception of Unzen) lie in a region generally above the 100 km contour of the subducting slab. Due to a southward increase in back-arc extension rate and southward steepening of the subducting slab, there is a south ...
... Many previous workers have noted that most of the arc volcanoes in Kyushu (with the exception of Unzen) lie in a region generally above the 100 km contour of the subducting slab. Due to a southward increase in back-arc extension rate and southward steepening of the subducting slab, there is a south ...
Sum4_Flatslabs
... the subducting plate to supplement the buoyancy factor. This was not a part of his models and is therefore a possibility. 2. There may be other possibilities not discussed by van Hunen. We discussed the possibility that there may be other mechanisms, yet undetermined, ...
... the subducting plate to supplement the buoyancy factor. This was not a part of his models and is therefore a possibility. 2. There may be other possibilities not discussed by van Hunen. We discussed the possibility that there may be other mechanisms, yet undetermined, ...
Escape tectonics and the extrusion of Alaska: Past, present, and future
... Beck, M.E., Jr., 1986, Model for late Mesozoic-Early Tertiary tectonics of coastal California and western Mexico and speculations on the origin of the San ...
... Beck, M.E., Jr., 1986, Model for late Mesozoic-Early Tertiary tectonics of coastal California and western Mexico and speculations on the origin of the San ...