Formation of metamorphic core complexes in non-over - HAL-Insu
... ~600°C–700°C). Finally, Tirel et al. (2013) developed a model where MCC forms as a result of stacking and exhumation of continental terrains in a back-arc extension context. Moreover, 3D models testing the impact of kinematic extensional boundary conditions demonstrate geometrical ...
... ~600°C–700°C). Finally, Tirel et al. (2013) developed a model where MCC forms as a result of stacking and exhumation of continental terrains in a back-arc extension context. Moreover, 3D models testing the impact of kinematic extensional boundary conditions demonstrate geometrical ...
47. the ocean/continent transition beneath the iberia abyssal plain
... (1964). As a result of its elevated location, Galicia Bank has long been starved of sediment and this has helped in the study of the sediment seismostratigraphy and basement tectonics. The elevated location of Galicia Bank has been explained by 3000 m of Eocene uplift during the Pyrenean compression ...
... (1964). As a result of its elevated location, Galicia Bank has long been starved of sediment and this has helped in the study of the sediment seismostratigraphy and basement tectonics. The elevated location of Galicia Bank has been explained by 3000 m of Eocene uplift during the Pyrenean compression ...
the caribbean plate and the question of its formation
... Mesozoic and Cenozoic sandstones, siltstones and shales, occurring above the metamorphic basement, are the most in common rocks. The main part of the Caribbean plate consists of thickened oceanic crust of a plateau basalt. It was formed mostly in the Middle Cretaceous. Geophysical investigations det ...
... Mesozoic and Cenozoic sandstones, siltstones and shales, occurring above the metamorphic basement, are the most in common rocks. The main part of the Caribbean plate consists of thickened oceanic crust of a plateau basalt. It was formed mostly in the Middle Cretaceous. Geophysical investigations det ...
Gravity modeling of the lithosphere in the Calatrava
... NW−SE-oriented compressive tectonic regime. On the other hand, on the basis of evidence for its deep-seated origin, it has been linked to the existence of a baby-plume detached from an active megaplume below the Canary-Azores Islands and the western Mediterranean. In order to understand better the a ...
... NW−SE-oriented compressive tectonic regime. On the other hand, on the basis of evidence for its deep-seated origin, it has been linked to the existence of a baby-plume detached from an active megaplume below the Canary-Azores Islands and the western Mediterranean. In order to understand better the a ...
UHP metamorphism in garnet peridotite, Cuaba unit, Rio San Juan
... magnesiohornblende + late serpentine) and a corundum-bearing variant are associated with hornblende gneiss and schist (hornblende + plagioclase + quartz + rutile +/- garnet +/- biotite +/epidote) and retrograded eclogite (hornblende + symplectic diopside-plagioclase + garnet + quartz +/epidote) in t ...
... magnesiohornblende + late serpentine) and a corundum-bearing variant are associated with hornblende gneiss and schist (hornblende + plagioclase + quartz + rutile +/- garnet +/- biotite +/epidote) and retrograded eclogite (hornblende + symplectic diopside-plagioclase + garnet + quartz +/epidote) in t ...
Geophysical insights into the Transition fault debate: Propagating
... filtering, muting, f-k (frequency-wave number) filtering, stacking, water-bottom muting, and finite-difference migration. These profiles add to thousands of kilometers of basin-scale seismic data collected by private industry and the U.S. Geological Survey (USGS) (Bruns, 1983, 1985; Bruns and Carlso ...
... filtering, muting, f-k (frequency-wave number) filtering, stacking, water-bottom muting, and finite-difference migration. These profiles add to thousands of kilometers of basin-scale seismic data collected by private industry and the U.S. Geological Survey (USGS) (Bruns, 1983, 1985; Bruns and Carlso ...
North America`s Midcontinent Rift: When Rift Met LIP
... Pine mine and surrounding area (White and Wright, 1954; Table 1). Despite the lack of exposures of mineralized rock, White and Wright (1954, p. 690) concluded that 1840s the base of led to a mining the Nonesuch Formation had potential to host Cu “over an area many times larger than ...
... Pine mine and surrounding area (White and Wright, 1954; Table 1). Despite the lack of exposures of mineralized rock, White and Wright (1954, p. 690) concluded that 1840s the base of led to a mining the Nonesuch Formation had potential to host Cu “over an area many times larger than ...
global tectonic cycles Temporal relations between mineral deposits
... the balance between the volumes of rocks (and mineral deposits) generated during the three stages of supercontinent evolution (convergence, collision and breakup) and the respective preservation potential of each of these stages. Figure 3 highlights the heterogeneous temporal distribution of mineral ...
... the balance between the volumes of rocks (and mineral deposits) generated during the three stages of supercontinent evolution (convergence, collision and breakup) and the respective preservation potential of each of these stages. Figure 3 highlights the heterogeneous temporal distribution of mineral ...
Formation and Exhumation of Ultrahigh
... FIGURE 2 illustrates the results of a numerical investigation that produced exhumation via Chemenda-style, large-scale crustal stacking (FIG. 1). The model (Sizova et al. 2012) simulates subduction of a continental plate following closure of an ocean basin (FIG. 2A). The incoming continental passive ...
... FIGURE 2 illustrates the results of a numerical investigation that produced exhumation via Chemenda-style, large-scale crustal stacking (FIG. 1). The model (Sizova et al. 2012) simulates subduction of a continental plate following closure of an ocean basin (FIG. 2A). The incoming continental passive ...
univERsity oF copEnhAGEn
... been observed. Ray tracing modelling of a profile (Fig. 2) across the margin at Hatton Bank identifies an up-to 14 km thick zone of unusually high seismic P-wave velocity above 7.3 km/s (Fowler et al., 1989) and these velocities are further confirmed by seismic data from five expanding spread profiles (S ...
... been observed. Ray tracing modelling of a profile (Fig. 2) across the margin at Hatton Bank identifies an up-to 14 km thick zone of unusually high seismic P-wave velocity above 7.3 km/s (Fowler et al., 1989) and these velocities are further confirmed by seismic data from five expanding spread profiles (S ...
Moho and magmatic underplating
... been observed. Ray tracing modelling of a profile (Fig. 2) across the margin at Hatton Bank identifies an up-to 14 km thick zone of unusually high seismic P-wave velocity above 7.3 km/s (Fowler et al., 1989) and these velocities are further confirmed by seismic data from five expanding spread profiles (S ...
... been observed. Ray tracing modelling of a profile (Fig. 2) across the margin at Hatton Bank identifies an up-to 14 km thick zone of unusually high seismic P-wave velocity above 7.3 km/s (Fowler et al., 1989) and these velocities are further confirmed by seismic data from five expanding spread profiles (S ...
Plate Tectonics Teacher Assessment User Manual
... During a class discussion about the supercontinent Pangaea, one student says, “A long time ago, Pangaea broke up and the continents floated away from each other. Now the continents are all spread out all over Earth.” Which one of the following is the best assessment of this student’s response? ...
... During a class discussion about the supercontinent Pangaea, one student says, “A long time ago, Pangaea broke up and the continents floated away from each other. Now the continents are all spread out all over Earth.” Which one of the following is the best assessment of this student’s response? ...
Seismic Anisotropy of Subduction Zone Minerals–Contribution of
... of subduction zones to great depth. The distinguishing feature of the mantle in the subduction regions is the presence of hydrated phases, which transport water into the Earth’s interior and release it with dramatic local consequences, triggering earthquakes and melting. The seismological detection ...
... of subduction zones to great depth. The distinguishing feature of the mantle in the subduction regions is the presence of hydrated phases, which transport water into the Earth’s interior and release it with dramatic local consequences, triggering earthquakes and melting. The seismological detection ...
Research Focus: Crust formation in the western United
... 1988; 1993), most of this material is considered to be mantle-derived juvenile crust, and therefore represents newly formed crust (at 1.8–1.6 Ga). The interesting and highly provocative paper by Bickford and Hill in this issue of Geology (p. 167–170) challenges the view that crustal growth in southe ...
... 1988; 1993), most of this material is considered to be mantle-derived juvenile crust, and therefore represents newly formed crust (at 1.8–1.6 Ga). The interesting and highly provocative paper by Bickford and Hill in this issue of Geology (p. 167–170) challenges the view that crustal growth in southe ...
Temporal relations between mineral deposits and global tectonic
... the balance between the volumes of rocks (and mineral deposits) generated during the three stages of supercontinent evolution (convergence, collision and breakup) and the respective preservation potential of each of these stages. Figure 3 highlights the heterogeneous temporal distribution of mineral ...
... the balance between the volumes of rocks (and mineral deposits) generated during the three stages of supercontinent evolution (convergence, collision and breakup) and the respective preservation potential of each of these stages. Figure 3 highlights the heterogeneous temporal distribution of mineral ...
Normal faulting in central Tibet since at least 13.5 Myr ago
... ketones, which involves carbonyl oxide formation. In contrast, diradicals react with oxygen to give oxidation products mainly derived from the corresponding peroxides. When 1b was irradiated in the presence of oxygen, bis [9-(10-phenyl)anthryl]ketone was formed. Laser ¯ash photolysis studies showed ...
... ketones, which involves carbonyl oxide formation. In contrast, diradicals react with oxygen to give oxidation products mainly derived from the corresponding peroxides. When 1b was irradiated in the presence of oxygen, bis [9-(10-phenyl)anthryl]ketone was formed. Laser ¯ash photolysis studies showed ...
Chapter 7. Radiogenic Isotope Geochemistry of the Crust and Oceans
... melting of the mantle, would leave part of al. (2008); black symbols from Roth et al. (2013). Modithe mantle incompatible element-deplefied from O’Neil et al. (2008) and Roth et al. (2013). ted. Early Archean crust formed by subsequent melt extraction from that depleted mantle would have high 142Nd/ ...
... melting of the mantle, would leave part of al. (2008); black symbols from Roth et al. (2013). Modithe mantle incompatible element-deplefied from O’Neil et al. (2008) and Roth et al. (2013). ted. Early Archean crust formed by subsequent melt extraction from that depleted mantle would have high 142Nd/ ...
Dissertation - WordPress.com
... Figure 2 - Classification and Flow Characteristics Of Volcanic Rocks (Johnson, 2009) Temperature is used as an indicator, if magma changes so would the temperature, the movement of magma to the magma chamber would raise the average temperature, so by looking at the change in temperature you could ge ...
... Figure 2 - Classification and Flow Characteristics Of Volcanic Rocks (Johnson, 2009) Temperature is used as an indicator, if magma changes so would the temperature, the movement of magma to the magma chamber would raise the average temperature, so by looking at the change in temperature you could ge ...
Lower plate deformation at the Chile Triple Junction from the
... 4.1. Bathymetry of the SCR North of the CTJ The SCR offshore southern Chile consists of spreading segments trending ~N160°, separated by a series of parallel fracture zones, from north to south: the Guamblin, Darwin, Taitao, and Tres Montes FZs (Figures 2 and 3). The segment of the SCR currently ent ...
... 4.1. Bathymetry of the SCR North of the CTJ The SCR offshore southern Chile consists of spreading segments trending ~N160°, separated by a series of parallel fracture zones, from north to south: the Guamblin, Darwin, Taitao, and Tres Montes FZs (Figures 2 and 3). The segment of the SCR currently ent ...
Trace Element and Isotope Geochemistry of the Volcanic Rocks of
... relatively low <5' O values, and is designated the isotopically homogeneous suite (IHS). When compared with the IHS, the.second suite is characterized by large ranges and high values of Sr and Pb isotope ratios, a large range and low values of Nd isotope ratios, and relatively high d1 O values. It i ...
... relatively low <5' O values, and is designated the isotopically homogeneous suite (IHS). When compared with the IHS, the.second suite is characterized by large ranges and high values of Sr and Pb isotope ratios, a large range and low values of Nd isotope ratios, and relatively high d1 O values. It i ...
readingetal_geology_.. - Research School of Earth Sciences
... function work of Clitheroe et al. (2000) and the active source studies of Drummond (1988) and/or Collins et al. (2003). The Pilbara craton shows a very sharp, shallow Moho at 32 km with a velocity gradient in the lower crust. The Moho becomes deeper toward the south of the craton beneath the Hamersl ...
... function work of Clitheroe et al. (2000) and the active source studies of Drummond (1988) and/or Collins et al. (2003). The Pilbara craton shows a very sharp, shallow Moho at 32 km with a velocity gradient in the lower crust. The Moho becomes deeper toward the south of the craton beneath the Hamersl ...
gsa today - College of Science
... more we learn about its structure and morphology, the more difficult it is to postulate a simple model to explain its tectonic evolution. Subduction has occurred along the southern South America–Antarctic Peninsula margin for most of the past 200 m.y. (Tanner et al., 1982, Barker and Dalziel, 1983; ...
... more we learn about its structure and morphology, the more difficult it is to postulate a simple model to explain its tectonic evolution. Subduction has occurred along the southern South America–Antarctic Peninsula margin for most of the past 200 m.y. (Tanner et al., 1982, Barker and Dalziel, 1983; ...
Mantle plume
A mantle plume is a mechanism proposed in 1971 to explain volcanic regions of the earth that were not thought to be explicable by the then-new theory of plate tectonics. Some such volcanic regions lie far from tectonic plate boundaries, for example, Hawaii. Others represent unusually large-volume volcanism, whether on plate boundaries, e.g. Iceland, or basalt floods such as the Deccan or Siberian traps.A mantle plume is posited to exist where hot rock nucleates at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. The currently active volcanic centers are known as ""hot spots"". In particular, the concept that mantle plumes are fixed relative to one another, and anchored at the core-mantle boundary, was thought to provide a natural explanation for the time-progressive chains of older volcanoes seen extending out from some such hot spots, such as the Hawaiian–Emperor seamount chain.The hypothesis of mantle plumes from depth is not universally accepted as explaining all such volcanism. It has required progressive hypothesis-elaboration leading to variant propositions such as mini-plumes and pulsing plumes. Another hypothesis for unusual volcanic regions is the ""Plate model"". This proposes shallower, passive leakage of magma from the mantle onto the Earth's surface where extension of the lithosphere permits it, attributing most volcanism to plate tectonic processes, with volcanoes far from plate boundaries resulting from intraplate extension.