Western GecoPart5
... extending the transition data into the onshore. This would accurately define the existence of a possible parallel ridge, even maybe up to 3 ridges. These ridge(s) appear fault controlled from deep seated thrustal complexes confined to the southeast of the survey. While it is appreciated that the Red ...
... extending the transition data into the onshore. This would accurately define the existence of a possible parallel ridge, even maybe up to 3 ridges. These ridge(s) appear fault controlled from deep seated thrustal complexes confined to the southeast of the survey. While it is appreciated that the Red ...
Faults and Folds on the Colorado Plateau
... Wherever a fault responsible for a monocline can be seen in the Grand Canyon exposures it is found to be a reactivated Precambrian fault. It is reasonable to suggest that this is true in the CP as a whole. The compressive forces which reactivated the faults and caused the monoclines were due to the ...
... Wherever a fault responsible for a monocline can be seen in the Grand Canyon exposures it is found to be a reactivated Precambrian fault. It is reasonable to suggest that this is true in the CP as a whole. The compressive forces which reactivated the faults and caused the monoclines were due to the ...
Understanding the 3D Structure of the Gilmore Fault Zone Through
... Morand & Gray(1991) suggest that the GFZ formed during the Bindian orogeny in response to NNE-SSW compression event in which Ordovician volcanics that form the Macquarie arc were thrust under the WMB. It is also suggested that south-east directed slab rollback during the Bindian initiated oroclinal ...
... Morand & Gray(1991) suggest that the GFZ formed during the Bindian orogeny in response to NNE-SSW compression event in which Ordovician volcanics that form the Macquarie arc were thrust under the WMB. It is also suggested that south-east directed slab rollback during the Bindian initiated oroclinal ...
Slide 1 - Global Heat Flow Database
... 49 N shows a narrow band of high HFD over the volcanic arc followed by a gradual increase in HFD from 60 mW m-2 to 80 mW m-2 over a distance of about 800 km. In the region of the Idaho Batholith, between 800 km and 1150 km, HFD is about 80 mW m-2. ...
... 49 N shows a narrow band of high HFD over the volcanic arc followed by a gradual increase in HFD from 60 mW m-2 to 80 mW m-2 over a distance of about 800 km. In the region of the Idaho Batholith, between 800 km and 1150 km, HFD is about 80 mW m-2. ...
LATE CENOZOIC OROGENY IN JAPAN Late Cenozoic tectonic
... vertical displacement since Miocene, trends of fold axes and degree of deformation of sedimentary rocks in Japan. They illustrate some differences between the east Japan and west Japan arc systems. Lines of evidence show that the former is more active. In the east Japan arc system a series of erogen ...
... vertical displacement since Miocene, trends of fold axes and degree of deformation of sedimentary rocks in Japan. They illustrate some differences between the east Japan and west Japan arc systems. Lines of evidence show that the former is more active. In the east Japan arc system a series of erogen ...
plate tectonic framework and gps - Perso-sdt
... Anatolian and Dead Sea Transform fault zones exhibit predominant leftlateral motion, while the North Anatolian fault motion is governed by rightlateral strike slip. Horizontal displacement on these faults is determined by the relative motion between the Eurasian and Arabian Plates, with the Anatolia ...
... Anatolian and Dead Sea Transform fault zones exhibit predominant leftlateral motion, while the North Anatolian fault motion is governed by rightlateral strike slip. Horizontal displacement on these faults is determined by the relative motion between the Eurasian and Arabian Plates, with the Anatolia ...
Geol Soc London Spec Publ 204 2002
... The association between subduction and magmatism is clear. The recognition that volcanism in island arcs is related to subduction was quickly incorporated into tectonic models once plate tectonic theory was accepted at the end of the 1960s but since then research has led to revision of many ideas ab ...
... The association between subduction and magmatism is clear. The recognition that volcanism in island arcs is related to subduction was quickly incorporated into tectonic models once plate tectonic theory was accepted at the end of the 1960s but since then research has led to revision of many ideas ab ...
2D finite element modeling
... Abstract : A series of finite element models simulate the paleostress field in 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 i ...
... Abstract : A series of finite element models simulate the paleostress field in 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 i ...
Moho comparison
... Antilles are somewhat similar. (4) The South American continent is quite homogeneous in terms of velocity and crustal thickness, except it is ~8 km thicker along profile 64W. (5) The average Caribbean arc crust is consistently ~0.25 km/s faster than the S.A. continent, but similar to the global aver ...
... Antilles are somewhat similar. (4) The South American continent is quite homogeneous in terms of velocity and crustal thickness, except it is ~8 km thicker along profile 64W. (5) The average Caribbean arc crust is consistently ~0.25 km/s faster than the S.A. continent, but similar to the global aver ...
EPSL94HokeHelium3Alt.. - University of Colorado Boulder
... is delineated both to the east and the west by regions with low 3 H e / 4 H e ratios ( < 0.2RA), typical of radiogenic helium production in the crust. Studies of the regional groundwater regime suggest that the wide zone of elevated 3 H e / 4 H e values away from the active volcanic arc is unlikely ...
... is delineated both to the east and the west by regions with low 3 H e / 4 H e ratios ( < 0.2RA), typical of radiogenic helium production in the crust. Studies of the regional groundwater regime suggest that the wide zone of elevated 3 H e / 4 H e values away from the active volcanic arc is unlikely ...
Aseismic zone and earthquake segmentation associated with a
... epicentre15 and Enggano Island (Fig. 1). Here, the Indo-Australian plate subducts obliquely beneath the Sunda Plate at a convergence rate of ∼57 mm yr−1 , leading to slip partitioning between pure thrust motion orthogonal to the subduction system along the megathrust and strike-slip motion parallel ...
... epicentre15 and Enggano Island (Fig. 1). Here, the Indo-Australian plate subducts obliquely beneath the Sunda Plate at a convergence rate of ∼57 mm yr−1 , leading to slip partitioning between pure thrust motion orthogonal to the subduction system along the megathrust and strike-slip motion parallel ...
High pore pressures and porosity at 35 km depth in the Cascadia
... the subducting oceanic crust (high Vp/Vs layer), either the layer must be capped by a very low permeability seal or the entire layer has low permeability. The permeability of a caprock or seal may be estimated from Darcy’s Law, assuming a fluid production rate of 2 × 10−4 m3/(m2 yr) within subductin ...
... the subducting oceanic crust (high Vp/Vs layer), either the layer must be capped by a very low permeability seal or the entire layer has low permeability. The permeability of a caprock or seal may be estimated from Darcy’s Law, assuming a fluid production rate of 2 × 10−4 m3/(m2 yr) within subductin ...
chapter 2
... The assembly of the Pacific Northwest began with the breakup of the supercontinent of Pangea in Mid-Jurassic time, about 200 million years ago. Since that time, between 500 and 700 kilometers of new terrain has been added to the western edge of the continent, representing most of Washington State, Br ...
... The assembly of the Pacific Northwest began with the breakup of the supercontinent of Pangea in Mid-Jurassic time, about 200 million years ago. Since that time, between 500 and 700 kilometers of new terrain has been added to the western edge of the continent, representing most of Washington State, Br ...
Earthquake size distribution in subduction zones
... and b-value and a positive correlation between trench normal upper plate velocity (measured in the direction away from the trench) and b-value. However, both Fig. 3b and c show weak, but opposite correlations. These results suggest that the horizontal force balance, which the convergence rate or the ...
... and b-value and a positive correlation between trench normal upper plate velocity (measured in the direction away from the trench) and b-value. However, both Fig. 3b and c show weak, but opposite correlations. These results suggest that the horizontal force balance, which the convergence rate or the ...
Impact of lower plate structure on upper plate
... the Investigator ridges (Hebert et al., 1996) to the South-east of Sumatra are fracture zones in the Wharton Basin activated and reactivated as left-lateral N-S strike-slip faults (Deplus et al., 1998) due to deformation in the India-Capricorn-Australia plate system (Gordon et al., 1998). Their orie ...
... the Investigator ridges (Hebert et al., 1996) to the South-east of Sumatra are fracture zones in the Wharton Basin activated and reactivated as left-lateral N-S strike-slip faults (Deplus et al., 1998) due to deformation in the India-Capricorn-Australia plate system (Gordon et al., 1998). Their orie ...
Kimberlites and the start of plate tectonics
... Plume-focused interpretations relate KBLs DEEP SUBDUCTION AND KIMBERLITES to mantle plume activity (Haggerty, 1994; TorsThe remaining interpretation for the observed vik et al., 2010). This explanation is not sup- age distribution of KBLs is that the concentraported by the geologic record, which sho ...
... Plume-focused interpretations relate KBLs DEEP SUBDUCTION AND KIMBERLITES to mantle plume activity (Haggerty, 1994; TorsThe remaining interpretation for the observed vik et al., 2010). This explanation is not sup- age distribution of KBLs is that the concentraported by the geologic record, which sho ...
Atlantic Conjugate Margins
... Global Plate Modelling: Objectives and Motivation • The construction of regional and global plate tectonic models is critical to understanding a wide range of geological processes such as basin dynamics, margin evolution and palaeo-environment development. • Plate models allow visualisation of regi ...
... Global Plate Modelling: Objectives and Motivation • The construction of regional and global plate tectonic models is critical to understanding a wide range of geological processes such as basin dynamics, margin evolution and palaeo-environment development. • Plate models allow visualisation of regi ...
Thermal Structure and Metamorphic Evolution of Subducting Slabs
... convection and the negative buoyancy of slabs (slab pull) drives plate tectonics [Forsyth and Uyeda, 1975]. Subduction zones are regions of intense earthquake activity, explosive volcanism, and complex mass transfer between the crust, mantle, hydrosphere, and atmosphere. In this contribution, I focu ...
... convection and the negative buoyancy of slabs (slab pull) drives plate tectonics [Forsyth and Uyeda, 1975]. Subduction zones are regions of intense earthquake activity, explosive volcanism, and complex mass transfer between the crust, mantle, hydrosphere, and atmosphere. In this contribution, I focu ...
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... 20 and 10 Ma ago, and a second acceleration occurred after 3 Ma ago. The latter is also expressed in the stratigraphy by a marked change in sedimentary environment in the Late Pliocene-Early Pleistocene, by thick sequences of coarse conglomerates, sedimentary gaps and tectonic unconformities. In the ...
... 20 and 10 Ma ago, and a second acceleration occurred after 3 Ma ago. The latter is also expressed in the stratigraphy by a marked change in sedimentary environment in the Late Pliocene-Early Pleistocene, by thick sequences of coarse conglomerates, sedimentary gaps and tectonic unconformities. In the ...
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 ...
Did Paleo-Tethyan anoxia kill arc magma fertility for
... Serbia (ca. 84 Ma), the Sar Cheshmeh porphyry Cu-Mo deposit in central Iran (ca. 14 Ma), and the Qulong porphyry Cu-Mo deposit in Tibet (ca. 16 Ma). The oldest known deposits occur in Tibet and the Indosinian porphyry belt of southwestern China, and include Yangla (ca. 233 Ma), Pulang (ca. 213 Ma), ...
... Serbia (ca. 84 Ma), the Sar Cheshmeh porphyry Cu-Mo deposit in central Iran (ca. 14 Ma), and the Qulong porphyry Cu-Mo deposit in Tibet (ca. 16 Ma). The oldest known deposits occur in Tibet and the Indosinian porphyry belt of southwestern China, and include Yangla (ca. 233 Ma), Pulang (ca. 213 Ma), ...
492 Island Arcs
... island arcs along subduction zones (also known as Benioff zones). It was not until 1968 that the next significant advance was made. The hypothesis of ocean-floor spreading in the 1960s had postulated that new lithosphere was being continuously created. It was recognised that unless the Earth was exp ...
... island arcs along subduction zones (also known as Benioff zones). It was not until 1968 that the next significant advance was made. The hypothesis of ocean-floor spreading in the 1960s had postulated that new lithosphere was being continuously created. It was recognised that unless the Earth was exp ...
Space geodetic observation of deep basal subduction erosion in
... dip angle a evolve in time, but here we assume uniform erosion and that the geometry has been kept similar (Fig. 5). Let a and vt be 30‡ and 10 mm/yr, respectively, then the deep basal erosion rate vt sina would be 5 mm/yr. The current rate of 15 mm/yr from space geodesy is three times as large. Ero ...
... dip angle a evolve in time, but here we assume uniform erosion and that the geometry has been kept similar (Fig. 5). Let a and vt be 30‡ and 10 mm/yr, respectively, then the deep basal erosion rate vt sina would be 5 mm/yr. The current rate of 15 mm/yr from space geodesy is three times as large. Ero ...
ABSTRACT: Northern Gulf of Mexico: A Passive or Passive Active
... In the West Cameron area, the Holocene clastics (MMS, 1986) seem to have been piled up on the east side of the Sabine transfer fault indicating more accomodation space on this side versus the other. Also, in the same area, bathymetric rollover folds, coming from the Texas side and oriented parallel ...
... In the West Cameron area, the Holocene clastics (MMS, 1986) seem to have been piled up on the east side of the Sabine transfer fault indicating more accomodation space on this side versus the other. Also, in the same area, bathymetric rollover folds, coming from the Texas side and oriented parallel ...
1 Accretion of terranes and growth of continental crust along the
... result of tectonic loading on the southern margin of Laurentian continental crust. Deformed synorogenic deposits are overlain by an undeformed Upper Pennsylvanian– Middle Permian shallow-marine fill of a successor basin, indicating the termination of orogenic contraction and terrane accretion within ...
... result of tectonic loading on the southern margin of Laurentian continental crust. Deformed synorogenic deposits are overlain by an undeformed Upper Pennsylvanian– Middle Permian shallow-marine fill of a successor basin, indicating the termination of orogenic contraction and terrane accretion within ...