The ocean-continent transition in the uniform lithospheric stretching
... where this is documented, does not seem to be marked by a significant topographic step (see, for example, Montadert et al. 1971a, b). Thus, it can be concluded that in general the stretched continental crust had reached a level within 500m or less of the level of emplacement of early oceanic crust w ...
... where this is documented, does not seem to be marked by a significant topographic step (see, for example, Montadert et al. 1971a, b). Thus, it can be concluded that in general the stretched continental crust had reached a level within 500m or less of the level of emplacement of early oceanic crust w ...
Earthquake Faults
... all directions from the point of initial rupture. These waves shake the ground as they pass by. An earthquake is felt if the shaking is strong enough to cause ground accelerations exceeding approximately 1.0 centimeter/second squared. Epicenter—the point on the Earth’s surface directly above the foc ...
... all directions from the point of initial rupture. These waves shake the ground as they pass by. An earthquake is felt if the shaking is strong enough to cause ground accelerations exceeding approximately 1.0 centimeter/second squared. Epicenter—the point on the Earth’s surface directly above the foc ...
A geological model for the structure of ridge segments in slow
... observed at a second-orderdiscontinuity farther south in the MARK area (23ø15'N), whereresidualgravity anomaliesover IC crustexceedthoseover OC crustby 10-20 mGal. In residual gravity maps of the South Atlantic [Kuo and Forsyth, 1988], two ...
... observed at a second-orderdiscontinuity farther south in the MARK area (23ø15'N), whereresidualgravity anomaliesover IC crustexceedthoseover OC crustby 10-20 mGal. In residual gravity maps of the South Atlantic [Kuo and Forsyth, 1988], two ...
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... (2) It is the only suture in the Arabian–Nubian Shield where a complete ophiolite is preserved at Jebel Gerf (Zimmer et al., 1995; Fig. 1); (3) The suture extends in a general east-west direction and its western end is at a high angle to the proposed N-trending, western margin of the Arabian–Nubian ...
... (2) It is the only suture in the Arabian–Nubian Shield where a complete ophiolite is preserved at Jebel Gerf (Zimmer et al., 1995; Fig. 1); (3) The suture extends in a general east-west direction and its western end is at a high angle to the proposed N-trending, western margin of the Arabian–Nubian ...
Geophysical Journal International - E
... The study area is divided into two main tectonic units: the Iberian Massif, and the Betic domain. The Iberian massif forms a major part of the Iberian Peninsula and represents one of the best exposed fragments of the European Variscan orogen (Fig. 1). We probe the southern part of the Iberian massif ...
... The study area is divided into two main tectonic units: the Iberian Massif, and the Betic domain. The Iberian massif forms a major part of the Iberian Peninsula and represents one of the best exposed fragments of the European Variscan orogen (Fig. 1). We probe the southern part of the Iberian massif ...
Convergence and Collision
... by the flow direction and velocity of the asthenosphere into which the lithosphere sinks. Because the lithosphere is cooler then the asthenosphere, the subducting plate perturbs the thermal structure of the mantle (Figure 17.7). The internal part of the downgoing plate remains relatively cool down t ...
... by the flow direction and velocity of the asthenosphere into which the lithosphere sinks. Because the lithosphere is cooler then the asthenosphere, the subducting plate perturbs the thermal structure of the mantle (Figure 17.7). The internal part of the downgoing plate remains relatively cool down t ...
The Great Basin Altiplano during the middle
... (1997) model states that the crust thinning was from 70 to 50 km by extensional unroofing between the Cretaceous and Eocene–Oligocene, whereas Constenius (1996) concluded that extensional basins formed from the middle Eocene to early Miocene. However, on the basis of his study of interbedded ash-flo ...
... (1997) model states that the crust thinning was from 70 to 50 km by extensional unroofing between the Cretaceous and Eocene–Oligocene, whereas Constenius (1996) concluded that extensional basins formed from the middle Eocene to early Miocene. However, on the basis of his study of interbedded ash-flo ...
Thermal and petrophysical characterization of the lithospheric
... of the Iberian microplate that started in early Cretaceous times with the northward propagation of the Atlantic Ocean, and the Alpine collision of the northward moving African plate with stable Europe. The relative and complex motions of Iberia, Africa and Europe have given rise to numerous tectonic ...
... of the Iberian microplate that started in early Cretaceous times with the northward propagation of the Atlantic Ocean, and the Alpine collision of the northward moving African plate with stable Europe. The relative and complex motions of Iberia, Africa and Europe have given rise to numerous tectonic ...
Collision and Postcollision Structural Evolution of the Andrianovka
... lateral metamorphic zoning discordantly arranged relative to the group and formation boundaries is less distinct [16]. The slightly metamorphosed and unmetamorphosed rocks of the Sredinny Range pertain to the autochthonous or paraautochthonous units of the Upper Cretaceous-Paleocene Khozgon Formatio ...
... lateral metamorphic zoning discordantly arranged relative to the group and formation boundaries is less distinct [16]. The slightly metamorphosed and unmetamorphosed rocks of the Sredinny Range pertain to the autochthonous or paraautochthonous units of the Upper Cretaceous-Paleocene Khozgon Formatio ...
evolution of the north american cordillera
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
EVOLUTION OF THE NORTH AMERICAN CORDILLERA William R
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
Stratigraphy, structure and regional correlations of crustal
... Figure 2. Diagram summarizing age constraints for the deformation and metamorphic events in the southern Quebec Appalachians. Figure 3. Schematic model for structural evolution of Laurentian margin in southern Quebec. Figure 4. Geological map showing the location of major ophiolites and the inferred ...
... Figure 2. Diagram summarizing age constraints for the deformation and metamorphic events in the southern Quebec Appalachians. Figure 3. Schematic model for structural evolution of Laurentian margin in southern Quebec. Figure 4. Geological map showing the location of major ophiolites and the inferred ...
Late Mesozoic – Early Cenozoic structural evolution of - UiO
... 2008). Furthermore, Faleide et al. (2008) suggested that this horizon mark the transition to glacial sediment deposition during the Northern Hemisphere Glaciation since about 2.6 Ma. Large Plio-Pleistocene depocenters formed fans in front of bathymetric throughs scoured by ice streams eroding the sh ...
... 2008). Furthermore, Faleide et al. (2008) suggested that this horizon mark the transition to glacial sediment deposition during the Northern Hemisphere Glaciation since about 2.6 Ma. Large Plio-Pleistocene depocenters formed fans in front of bathymetric throughs scoured by ice streams eroding the sh ...
Laramide crustal thickening event in the Rocky Mountain Foreland
... buted to changing crustal thickness. The slow subsidence due to cooling in the Paleozoic and Mesozoic [Armin and Mayer, 1983] did not result in major elevation changes; apparently the thickening of the lithosphere was balanced by small ...
... buted to changing crustal thickness. The slow subsidence due to cooling in the Paleozoic and Mesozoic [Armin and Mayer, 1983] did not result in major elevation changes; apparently the thickening of the lithosphere was balanced by small ...
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... activity is most prolific nearest the arc and diminishes with distance from the trench. A possible objection to the GoM BAB hypothesis is that the spreading ridge was oriented at high angles to the Nazas arc trend, whereas modern oceanic BAB spreading ridges generally parallel the associated arc. Co ...
... activity is most prolific nearest the arc and diminishes with distance from the trench. A possible objection to the GoM BAB hypothesis is that the spreading ridge was oriented at high angles to the Nazas arc trend, whereas modern oceanic BAB spreading ridges generally parallel the associated arc. Co ...
vi. north moluccas
... Early geologic map of Seram (Rutten 1929; from Rutten and Hotz, 1920) Paleozoic metamorphics are overlain by M-L Triassic Kanikeh Fm flysch-type clastics, overlain by Late Triassic reefal and deepwater limestones (commonly interpreted as Jurassic, but paleontological evidence appears to exclusively ...
... Early geologic map of Seram (Rutten 1929; from Rutten and Hotz, 1920) Paleozoic metamorphics are overlain by M-L Triassic Kanikeh Fm flysch-type clastics, overlain by Late Triassic reefal and deepwater limestones (commonly interpreted as Jurassic, but paleontological evidence appears to exclusively ...
Did westward subduction cause Cretaceous
... The North American portion of the Cordilleran orogen extends continuously from Alaska to southern Mexico, and from east to west over much of its length the orogen comprises an easterly vergent fold-thrust belt, a complexly deformed metamorphic hinterland that collapsed gravitationally, and an interl ...
... The North American portion of the Cordilleran orogen extends continuously from Alaska to southern Mexico, and from east to west over much of its length the orogen comprises an easterly vergent fold-thrust belt, a complexly deformed metamorphic hinterland that collapsed gravitationally, and an interl ...
eastern european alpine system and the carpathian
... of the continental fragments indicate they were considerably larger than their present size and had different shapes. Convergence of continental fragments began in the Late Jurassic by subduction of oceanic crust, but upon complete disappearance of oceanic crust, convergence continued with subductio ...
... of the continental fragments indicate they were considerably larger than their present size and had different shapes. Convergence of continental fragments began in the Late Jurassic by subduction of oceanic crust, but upon complete disappearance of oceanic crust, convergence continued with subductio ...
The Periadriatic lineament and the role of strike slip - RWTH
... Quarz-rich rocks” [4] and shows an ...
... Quarz-rich rocks” [4] and shows an ...
Continental breakup and the onset of ultraslow seafloor spreading
... event. Reflection V correlates with a wide-angle reflection seen on OBS 16 and marks the top of the middle crust (Funck et al., 2003). It truncates against W, a strong, but discontinuous reflection that dips 458 landward and may be a fault. Both reflections W and M terminate seaward at a large, sedi ...
... event. Reflection V correlates with a wide-angle reflection seen on OBS 16 and marks the top of the middle crust (Funck et al., 2003). It truncates against W, a strong, but discontinuous reflection that dips 458 landward and may be a fault. Both reflections W and M terminate seaward at a large, sedi ...
the caribbean plate and the question of its formation
... There are nine magmatic arcs or pieces of arcs in the Caribbean region. The Greater Antilles represent island arcs with continental blocks yielding Late Proterozoic ages in some parts (Renne, et al., 1989). Cuba, Hispaniola, Puerto Rico and Virgin Island belong to that group of magmatic island arcs ...
... There are nine magmatic arcs or pieces of arcs in the Caribbean region. The Greater Antilles represent island arcs with continental blocks yielding Late Proterozoic ages in some parts (Renne, et al., 1989). Cuba, Hispaniola, Puerto Rico and Virgin Island belong to that group of magmatic island arcs ...
2D finite element modeling
... accretionary prism at di#erent stages during the Late Cretaceous accretion of Mesozoic melange belts (McHugh Complex and Iceworm melamges) in the Chugach convergent margin, central-south Alaska. The accretionary prism is assumed to be elastic continuum. The subduction of the Pacific plate beneath the ...
... accretionary prism at di#erent stages during the Late Cretaceous accretion of Mesozoic melange belts (McHugh Complex and Iceworm melamges) in the Chugach convergent margin, central-south Alaska. The accretionary prism is assumed to be elastic continuum. The subduction of the Pacific plate beneath the ...
Equatorial Segment of the Mid-Atlantic Ridge: initial results of the
... a cluster of fracture zones - Cape Verde, Marathon, Mercury, Vema, Doldrums, Vemadsky and Sierra Leone - in the North, and a similar cluser of fracture zones - St. Paul, Romanche and Chain - in the South. During recent decades, following the publication of the 5th edition of the General Bathymetric ...
... a cluster of fracture zones - Cape Verde, Marathon, Mercury, Vema, Doldrums, Vemadsky and Sierra Leone - in the North, and a similar cluser of fracture zones - St. Paul, Romanche and Chain - in the South. During recent decades, following the publication of the 5th edition of the General Bathymetric ...
FOSI BeritaSedimentologi BS 23 March2012
... Permian extension Upper Permian to Lower Triassic subsidence Upper Triassic to Lower Jurassic compression and inversion Lower to Middle Jurassic extension Upper Jurassic to Paleogene thermal subsidence Middle to Upper Miocene inversion. Hill & Hoffman (2004) showed substantial thinning of ...
... Permian extension Upper Permian to Lower Triassic subsidence Upper Triassic to Lower Jurassic compression and inversion Lower to Middle Jurassic extension Upper Jurassic to Paleogene thermal subsidence Middle to Upper Miocene inversion. Hill & Hoffman (2004) showed substantial thinning of ...
The discovery of a conjugate system of faults in the Wharton Basin
... Wharton Basin is east-west, but the shear zones are oblique to these preexisting structures, suggesting that the shear zones are new and not reactivated spreading-related normal faults. The sediment thickness over the normal oceanic crust, away from the fracture zones, is ~2.2 km (Figs. 4 and 5). A ...
... Wharton Basin is east-west, but the shear zones are oblique to these preexisting structures, suggesting that the shear zones are new and not reactivated spreading-related normal faults. The sediment thickness over the normal oceanic crust, away from the fracture zones, is ~2.2 km (Figs. 4 and 5). A ...