The role of crustal heterogeneity in controlling vertical coupling
... boundary (c. 93 Ma) (Hernández-Romano et al. 1997) or at the Turonian–Coniacian boundary (c. 89 Ma) (Lang & Frerichs 1998). Almost all authors agree in placing the end of the Laramide episode in the Paleocene in view of time constraints north of the TMVB (Salinas-Prieto et al. 2000, and references ...
... boundary (c. 93 Ma) (Hernández-Romano et al. 1997) or at the Turonian–Coniacian boundary (c. 89 Ma) (Lang & Frerichs 1998). Almost all authors agree in placing the end of the Laramide episode in the Paleocene in view of time constraints north of the TMVB (Salinas-Prieto et al. 2000, and references ...
Plate tectonics from space - Laboratoire de Géologie de l`Ecole
... of diffuse compression (e.g. Mediterranean, Andean and Himalayan orogens, see Figure 2) or diffuse extension (e.g. Basin and Range Province, western Turkey). Although less studied, areas of diffuse compression and/or extension are also found over the oceanic lithosphere, such as the diffuse boundari ...
... of diffuse compression (e.g. Mediterranean, Andean and Himalayan orogens, see Figure 2) or diffuse extension (e.g. Basin and Range Province, western Turkey). Although less studied, areas of diffuse compression and/or extension are also found over the oceanic lithosphere, such as the diffuse boundari ...
Crustal structure and evolution of the Mariana intra
... generated in the mantle wedge. At the juvenile stage of arc evolution, the mantle-derived basalt magma forms the initial arc crust, which is most simply composed of differentiated basalt and cumulate layers. This model regards the basaltic materials underplated at the bottom of the crust as a part o ...
... generated in the mantle wedge. At the juvenile stage of arc evolution, the mantle-derived basalt magma forms the initial arc crust, which is most simply composed of differentiated basalt and cumulate layers. This model regards the basaltic materials underplated at the bottom of the crust as a part o ...
Pb composition of Mesozoic Pacific oceanic crust
... and biostratigraphy [Matsuoka, 1992; Ogg et al., 1992; Bartolini and Larson, 2001] show an age progression from Middle Cretaceous (127 Ma, magnetic lineation M5) in the North (east of southern Japan) to Middle Jurassic (165 – 170 Ma, Jurassic Magnetic Quiet Zone) in the South (east of the southern ...
... and biostratigraphy [Matsuoka, 1992; Ogg et al., 1992; Bartolini and Larson, 2001] show an age progression from Middle Cretaceous (127 Ma, magnetic lineation M5) in the North (east of southern Japan) to Middle Jurassic (165 – 170 Ma, Jurassic Magnetic Quiet Zone) in the South (east of the southern ...
Shape and origin of the East-Alpine slab constrained by the
... Massif were added through data exchange with the BOHEMA III project (Babuška et al., 2005). A generalized tectonic map and the locations of the seismic observatories and temporary stations employed are shown in Fig. 1a and b. Epicenters of the evaluated earthquakes, their azimuth distribution around ...
... Massif were added through data exchange with the BOHEMA III project (Babuška et al., 2005). A generalized tectonic map and the locations of the seismic observatories and temporary stations employed are shown in Fig. 1a and b. Epicenters of the evaluated earthquakes, their azimuth distribution around ...
The discovery of a conjugate system of faults in the Wharton Basin
... of the Riedel shears striking 330° to 360° might be genetically related to the 335°-striking normal faults that we observe in our study. Similarly, faults west of fracture zone F5 (fig. S5) have strikes between 330° and 340°, indicating that they might also have a similar origin. Although the baseme ...
... of the Riedel shears striking 330° to 360° might be genetically related to the 335°-striking normal faults that we observe in our study. Similarly, faults west of fracture zone F5 (fig. S5) have strikes between 330° and 340°, indicating that they might also have a similar origin. Although the baseme ...
Possible Mesozoic sediments in fault and brecciation zones in
... similarly trending faults in this part of Mid Norway, such as the Tarva and Dolmsundet faults along the southern margin of the Frohavet Basin (Bøe 1991, Sommaruga & Bøe 2002), may be associated with the MTFC.The Dolmsundet fault can be traced from the northeast into the narrow sound Dolmsundet betwe ...
... similarly trending faults in this part of Mid Norway, such as the Tarva and Dolmsundet faults along the southern margin of the Frohavet Basin (Bøe 1991, Sommaruga & Bøe 2002), may be associated with the MTFC.The Dolmsundet fault can be traced from the northeast into the narrow sound Dolmsundet betwe ...
Geophysical insights into the Transition fault debate: Propagating
... been colliding with the North American plate in a 600-km-long orogenic belt over ~10 m.y. (Plafker et al., 1994; Rea and Snoeckx, 1995). This collision has resulted in underthrusting of ~600 km of Yakutat crust and has generated a flat-slab subduction zone with a subhorizontal Wadati-Benioff zone (F ...
... been colliding with the North American plate in a 600-km-long orogenic belt over ~10 m.y. (Plafker et al., 1994; Rea and Snoeckx, 1995). This collision has resulted in underthrusting of ~600 km of Yakutat crust and has generated a flat-slab subduction zone with a subhorizontal Wadati-Benioff zone (F ...
Continental breakup and the onset of ultraslow seafloor spreading
... this weak material formed the S reflection and unroofed a peridotite ridge. Breakup just west of the peridotite ridge isolated it on the Galicia Bank margin and led to stage 2, where mantle melts reached the surface and seafloor spreading was established. Limited magmatism produced highly tectonized ...
... this weak material formed the S reflection and unroofed a peridotite ridge. Breakup just west of the peridotite ridge isolated it on the Galicia Bank margin and led to stage 2, where mantle melts reached the surface and seafloor spreading was established. Limited magmatism produced highly tectonized ...
LOW RES
... lithosphere; subducted slabs in these subduction zones are relatively cool. In contrast, the young incoming lithosphere and modest convergence rates of subduction zones such as Nankai and Cascadia lead to relatively warm subducted slabs. At shallow depths (<50 km), temperatures along the slabmantle ...
... lithosphere; subducted slabs in these subduction zones are relatively cool. In contrast, the young incoming lithosphere and modest convergence rates of subduction zones such as Nankai and Cascadia lead to relatively warm subducted slabs. At shallow depths (<50 km), temperatures along the slabmantle ...
Bathymetry of Mariana trench-arc system and formation of the
... [2] The classic trench/arc/back arc geomorphology, so typical of the Mariana convergent plate boundary, changes markedly toward its southern end. The forearc narrows southward and the trench-arc distance decreases until the Mariana Ridge almost intersects the Mariana Trench near the island of Guam ( ...
... [2] The classic trench/arc/back arc geomorphology, so typical of the Mariana convergent plate boundary, changes markedly toward its southern end. The forearc narrows southward and the trench-arc distance decreases until the Mariana Ridge almost intersects the Mariana Trench near the island of Guam ( ...
38. Paleomagnetic Study of Deep-Sea Sediments from the Cagayan
... declination for Core 124-769A-2H is due to bad core orientation data. The clear direction change including swing of declination by 180° and change of inclination sign at 62.4 mbsf marks the reversal between the Brunhes and Matuyama Epochs indicating that Hole 769A covers a little more than 0.73 m.y. ...
... declination for Core 124-769A-2H is due to bad core orientation data. The clear direction change including swing of declination by 180° and change of inclination sign at 62.4 mbsf marks the reversal between the Brunhes and Matuyama Epochs indicating that Hole 769A covers a little more than 0.73 m.y. ...
Indentation of a continent with a built
... when magmas rising from the subducting oceanic plate arc weld the accreted prism of sediments into continental crust in either island or cordilleran arcs (Mitchel and Garson, 1976). Open-ocean subduction may be punctuated by the docking of small terrains with large continents. However, large persist ...
... when magmas rising from the subducting oceanic plate arc weld the accreted prism of sediments into continental crust in either island or cordilleran arcs (Mitchel and Garson, 1976). Open-ocean subduction may be punctuated by the docking of small terrains with large continents. However, large persist ...
Petrology and tectonics of Phanerozoic continent formation: From
... continent formation. We combine new trace-element data on lower crustal xenoliths from the Mesozoic Sierra Nevada Batholith with an extensive grid-based geochemical map of the Peninsular Ranges Batholith, the southern equivalent of the Sierras. Collectively, these observations give a three-dimension ...
... continent formation. We combine new trace-element data on lower crustal xenoliths from the Mesozoic Sierra Nevada Batholith with an extensive grid-based geochemical map of the Peninsular Ranges Batholith, the southern equivalent of the Sierras. Collectively, these observations give a three-dimension ...
Geology First active hydrothermal vents on an ultraslow-spreading center: Southwest Indian Ridge
... widespread along all ultraslow-spreading ridges (German et al., 1998; Baker et al., 2004), at least in the magmatically robust regions. The 49°39′E active field is directly comparable, in lateral extent (at ~1000 m), to two of the largest known active hydrothermal fields from the slow-spreading Mid- ...
... widespread along all ultraslow-spreading ridges (German et al., 1998; Baker et al., 2004), at least in the magmatically robust regions. The 49°39′E active field is directly comparable, in lateral extent (at ~1000 m), to two of the largest known active hydrothermal fields from the slow-spreading Mid- ...
An Entirely New 3D-View of the Crustal and Mantle Structure of a
... The upper brittle continental crust tends to be a seismically poorly reflective layer, practically a blind zone (Figure 2). The top of the crystalline basement is rarely a significant reflection. Most of the times, it was tentatively interpreted at the basal termination of the reflective and stratif ...
... The upper brittle continental crust tends to be a seismically poorly reflective layer, practically a blind zone (Figure 2). The top of the crystalline basement is rarely a significant reflection. Most of the times, it was tentatively interpreted at the basal termination of the reflective and stratif ...
Fast spreading ridges
... • Be able to sketch the structure of fast and slow spreading mid-ocean ridges and describe how they differ • Describe how and why the structure and across-axis bathymetry of slow and fast ridges differ in terms of magmatic, tectonic and hydrothermal processes that form the crust ...
... • Be able to sketch the structure of fast and slow spreading mid-ocean ridges and describe how they differ • Describe how and why the structure and across-axis bathymetry of slow and fast ridges differ in terms of magmatic, tectonic and hydrothermal processes that form the crust ...
The link between the Moho depth of the NE Atlantic margin and
... For example the Moho boundary generally deepens from the centre of the Fennoscandian Shield towards the continent–ocean transition. Typical values at the coastline are 30–35 km and the depth decreases to values around 10–15 km at the continental edge. Over the stable shelf of the Barents Sea the cru ...
... For example the Moho boundary generally deepens from the centre of the Fennoscandian Shield towards the continent–ocean transition. Typical values at the coastline are 30–35 km and the depth decreases to values around 10–15 km at the continental edge. Over the stable shelf of the Barents Sea the cru ...
The continent marginal crust characteristic of nothern South China
... anomaly curve (Fig.9b), and get a perfect fitting curve. The result points out the oceanic crust should be behind ca 380 km because the thin crustal thickness (frame B; ca 6-8 km), the relatively high values both on bouguer anomaly (frame B’) and magnetic anomaly (frame B”). Another place we should ...
... anomaly curve (Fig.9b), and get a perfect fitting curve. The result points out the oceanic crust should be behind ca 380 km because the thin crustal thickness (frame B; ca 6-8 km), the relatively high values both on bouguer anomaly (frame B’) and magnetic anomaly (frame B”). Another place we should ...
2D finite element modeling
... to recover the regional paleostress field and deformation pattern if the structural and tectonic evolutionary history is clarified. Lundgren et al. (+33/) used finite element modelling technique to study crustal deformation in Alaska arc-trench system. Hassani et al. (+331) proposed three finite element ...
... to recover the regional paleostress field and deformation pattern if the structural and tectonic evolutionary history is clarified. Lundgren et al. (+33/) used finite element modelling technique to study crustal deformation in Alaska arc-trench system. Hassani et al. (+331) proposed three finite element ...
"lost Inca Plateau": cause of flat subduction - Archimer
... lack of bathymetric expression of the flexural moat indicated it is overfilled [10]. The volume of the moat infill (240,000 km3) is 2.5 times greater than the young volcanic edifices (90,000 km 3) [7] and of comparable thickness at the NW corner of the plateau (volcanism > 5 Ma) as at the SE corner ...
... lack of bathymetric expression of the flexural moat indicated it is overfilled [10]. The volume of the moat infill (240,000 km3) is 2.5 times greater than the young volcanic edifices (90,000 km 3) [7] and of comparable thickness at the NW corner of the plateau (volcanism > 5 Ma) as at the SE corner ...
Thickness of the lithosphere beneath Turkey and
... We apply the S-receiver function method to this data set in order to image seismic discontinuities in the crust and upper mantle. A description of the S-receiver function analysis scheme and examples are found in Yuan et al. (2006) and Kind et al. (2012, 2014). The method employs teleseismic S phase ...
... We apply the S-receiver function method to this data set in order to image seismic discontinuities in the crust and upper mantle. A description of the S-receiver function analysis scheme and examples are found in Yuan et al. (2006) and Kind et al. (2012, 2014). The method employs teleseismic S phase ...
Diapirs as the source of the sediment signature in arc lavas
... melt’ signature in arc lavas2–4 . Subduction zone thermal models that incorporate temperature- and stress-dependent viscosity5–8 produce slab-top temperatures above the fluid-saturated sediment solidus (>600–700 ◦ C at ≤3 GPa; refs 9,10), and H2 O/Ce and H2 O/K ratios in melt inclusions from arc lav ...
... melt’ signature in arc lavas2–4 . Subduction zone thermal models that incorporate temperature- and stress-dependent viscosity5–8 produce slab-top temperatures above the fluid-saturated sediment solidus (>600–700 ◦ C at ≤3 GPa; refs 9,10), and H2 O/Ce and H2 O/K ratios in melt inclusions from arc lav ...
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... until collision with India about 50 Ma ago, Kohistan existed as an Andean-type margin. For a current overview of the geology of Kohistan see Treloar et al. (1996). This report focuses on the intra-oceanic phase of Kohistan. The intra-oceanic arc crust of Kohistan consists of five principal units, ex ...
... until collision with India about 50 Ma ago, Kohistan existed as an Andean-type margin. For a current overview of the geology of Kohistan see Treloar et al. (1996). This report focuses on the intra-oceanic phase of Kohistan. The intra-oceanic arc crust of Kohistan consists of five principal units, ex ...
Receiver function images of the Hellenic subduction zone and
... structures in the forearc that have been identified as nearly vertical margins of forearc slivers the seismicity extends down to the subduction interface (Meier et al., 2007; Becker et al., 2009; Brüstle et al., 2014). The seismicity of the plate contact is only incompletely recorded due to the limi ...
... structures in the forearc that have been identified as nearly vertical margins of forearc slivers the seismicity extends down to the subduction interface (Meier et al., 2007; Becker et al., 2009; Brüstle et al., 2014). The seismicity of the plate contact is only incompletely recorded due to the limi ...