Cenozoic geological and plate tectonic evolution of SE Asia and the
... episodes of extension, forming ocean basins and causing subsidence within continental regions, probably driven by subduction. Within eastern Indonesia, New Guinea and the Melanesian arcs, there are multiple Cenozoic sutures, with very short histories compared to most well-known older orogenic belts. ...
... episodes of extension, forming ocean basins and causing subsidence within continental regions, probably driven by subduction. Within eastern Indonesia, New Guinea and the Melanesian arcs, there are multiple Cenozoic sutures, with very short histories compared to most well-known older orogenic belts. ...
Volatile Cycling of H2O, CO2, F, and Cl in the HIMU Mantle: A New
... radiogenic Pb-isotopic signature associated with the HIMU mantle domain [Chase, 1981; Hofmann and White, 1982]. A recycled origin for the HIMU mantle end-member has been further supported by sulfur isotopic measurements from olivine-hosted melt inclusions from Mangaia, which confirm that the material ...
... radiogenic Pb-isotopic signature associated with the HIMU mantle domain [Chase, 1981; Hofmann and White, 1982]. A recycled origin for the HIMU mantle end-member has been further supported by sulfur isotopic measurements from olivine-hosted melt inclusions from Mangaia, which confirm that the material ...
Formation and stability of magmatic segments in the Main Ethiopian
... younger, and less evolved, rift than the Red Sea and Gulf of Aden rifts, rather than a failed rift arm (Wolfenden et al., 2004). Seismic and geochemical data provide constraints on melting and melt emplacement beneath the MER. P- and S-wave tomography models indicate that the lithosphere–asthenosphe ...
... younger, and less evolved, rift than the Red Sea and Gulf of Aden rifts, rather than a failed rift arm (Wolfenden et al., 2004). Seismic and geochemical data provide constraints on melting and melt emplacement beneath the MER. P- and S-wave tomography models indicate that the lithosphere–asthenosphe ...
Composition of the Oceanic Crust - DukeSpace
... hundred kilometers in length are bounded by large-offset overlapping spreading centers. Nested within these primary magmatic segments are numerous secondary magmatic segments that share a common parental magma composition, and are bounded by smaller offset overlapping spreading centers. Detailed stu ...
... hundred kilometers in length are bounded by large-offset overlapping spreading centers. Nested within these primary magmatic segments are numerous secondary magmatic segments that share a common parental magma composition, and are bounded by smaller offset overlapping spreading centers. Detailed stu ...
Seismogeodynamics of Lineament Structures in the Mountainous
... Dagh inclusive, where it crosses the longitudinal Crimea–Kopet Dagh profile (4). The segment next in seismic potential is located at the intersection of this profile with the South Tien Shan profile (5), where three Gazli earthquakes (M = 7.0, 7.3, and 7.2) occurred in 1976 and 1984 in the same sour ...
... Dagh inclusive, where it crosses the longitudinal Crimea–Kopet Dagh profile (4). The segment next in seismic potential is located at the intersection of this profile with the South Tien Shan profile (5), where three Gazli earthquakes (M = 7.0, 7.3, and 7.2) occurred in 1976 and 1984 in the same sour ...
Why subduction zones are curved - Harvard John A. Paulson School
... While small loads lead to a gentle flattening of the sphere, initiation of a dimpled indentation occurs only when the applied load crosses a threshold. This implies, for example, that an intact eggshell can support much larger normal loads than a flat sheet of the same thickness and stiffness becaus ...
... While small loads lead to a gentle flattening of the sphere, initiation of a dimpled indentation occurs only when the applied load crosses a threshold. This implies, for example, that an intact eggshell can support much larger normal loads than a flat sheet of the same thickness and stiffness becaus ...
Earth`s heterogeneous mantle: A product of convection
... Ubiquitous heterogeneity in the Earth's mantle has been documented by numerous chemical and isotopic analyses of oceanic basalts. Despite the ever-increasing amount of data, the way in which compositional heterogeneity is manifest in the Earth's mantle, as well as the processes leading to mantle het ...
... Ubiquitous heterogeneity in the Earth's mantle has been documented by numerous chemical and isotopic analyses of oceanic basalts. Despite the ever-increasing amount of data, the way in which compositional heterogeneity is manifest in the Earth's mantle, as well as the processes leading to mantle het ...
The origin and evolution of the Earth`s continental crust
... The Archaean crust The composition of the Archaean upper crust as revealed in the sedimentary record stands in marked contrast to that of the post-Archaean crust (Taylor & McLennan 1995, table 3). A significant difference is shown by the REE patterns in the Archaean sedimentary rocks, which, relativ ...
... The Archaean crust The composition of the Archaean upper crust as revealed in the sedimentary record stands in marked contrast to that of the post-Archaean crust (Taylor & McLennan 1995, table 3). A significant difference is shown by the REE patterns in the Archaean sedimentary rocks, which, relativ ...
Destruction of the North China Craton
... movement of eastern China in the latter part of the Mesozoic, or the “Platform Reactivation” theory founded by professor Guoda Chen during the period of 1956–1960 [2]. Since the 1980s, several important ideas, such as continental deep subduction [3] (the Qinling-Dabie Mountains on the southern margi ...
... movement of eastern China in the latter part of the Mesozoic, or the “Platform Reactivation” theory founded by professor Guoda Chen during the period of 1956–1960 [2]. Since the 1980s, several important ideas, such as continental deep subduction [3] (the Qinling-Dabie Mountains on the southern margi ...
A combined study of melt inclusions and classical petrology on the
... and from the classical petrology allowed a better understanding of the melting processes occurred in the crustal sequence below the Ronda peridotite. The data collected in this study suggest that the crustal melting in Ronda metatexites occurred initially and locally at the fluidsaturated solidus ow ...
... and from the classical petrology allowed a better understanding of the melting processes occurred in the crustal sequence below the Ronda peridotite. The data collected in this study suggest that the crustal melting in Ronda metatexites occurred initially and locally at the fluidsaturated solidus ow ...
Recycling of the continental crust | SpringerLink
... important in explaining the origin of island-arc and related igneous rocks; there is growing agreement that 1-3% recycled sediment is involved in their origin. Components of recycled crustal material, with long-term storage (up to 2.5 b.y.) in the mantle as distinct entities, has been suggested for ...
... important in explaining the origin of island-arc and related igneous rocks; there is growing agreement that 1-3% recycled sediment is involved in their origin. Components of recycled crustal material, with long-term storage (up to 2.5 b.y.) in the mantle as distinct entities, has been suggested for ...
Crustal structure and evolution of the Mariana intra
... West Mariana Ridge cannot preserve serpentinized mantle due to the lack of a water source from a subducting slab and a higher mantle temperature than that of the Mariana arc (Hyndman and Peacock, 2003). Crustal Growth using the Seismic Structure and the Petrologic Model In this section, we interpret ...
... West Mariana Ridge cannot preserve serpentinized mantle due to the lack of a water source from a subducting slab and a higher mantle temperature than that of the Mariana arc (Hyndman and Peacock, 2003). Crustal Growth using the Seismic Structure and the Petrologic Model In this section, we interpret ...
pegmatites and pegmatites, just like granites and granites
... more likely reflects a mixed source, i.e., possibly involving both crust and mantle components. In contrast, there is the late Grenvillian St-Ludger-de-Milot NYF granitic pegmatite, near Roberval, Quebec, in which δ18O is 3.2‰, quite consistent with a modified mantle signature. Considered in the same ...
... more likely reflects a mixed source, i.e., possibly involving both crust and mantle components. In contrast, there is the late Grenvillian St-Ludger-de-Milot NYF granitic pegmatite, near Roberval, Quebec, in which δ18O is 3.2‰, quite consistent with a modified mantle signature. Considered in the same ...
Crustal Growth by Magmatic Accretion
... ADVANCE ACCESS PUBLICATION AUGUST 27, 2004 Magmatic accretion is potentially an important mechanism in the growth of the continental crust and the formation of granulites. In this study, the thermal evolution of a magmatic arc in response to magmatic accretion is modeled using numerical solutions of ...
... ADVANCE ACCESS PUBLICATION AUGUST 27, 2004 Magmatic accretion is potentially an important mechanism in the growth of the continental crust and the formation of granulites. In this study, the thermal evolution of a magmatic arc in response to magmatic accretion is modeled using numerical solutions of ...
Plume mantle source heterogeneity through time: Insights from the
... Figure 4. Schematic lithostratigraphic column of the Duarte Complex showing the location of the samples collected for this study. section. These rocks were extruded in a deep submarine environment at high effusive rate indicated by the scarcity of intercalated pelagic sediments. Toward the top of th ...
... Figure 4. Schematic lithostratigraphic column of the Duarte Complex showing the location of the samples collected for this study. section. These rocks were extruded in a deep submarine environment at high effusive rate indicated by the scarcity of intercalated pelagic sediments. Toward the top of th ...
1. LEG 209 SUMMARY: PROCESSES IN A 20-KM
... blocks; some rotations probably exceeded 60° around nearly horizontal axes parallel to the rift axis. Rotations occurred along several generations of high-temperature mylonitic shear zones extending deeper than 15 km depth and numerous faults at lower temperature. Early formed shear zones and faults ...
... blocks; some rotations probably exceeded 60° around nearly horizontal axes parallel to the rift axis. Rotations occurred along several generations of high-temperature mylonitic shear zones extending deeper than 15 km depth and numerous faults at lower temperature. Early formed shear zones and faults ...
Incipient shortening of a passive margin: the mechanical roles of
... adjustments. Models with various strength profiles represented oceanic lithospheres of different ages. The continental lithosphere reacted to an applied boundary velocity according to the strength and density of oceanic lithosphere. Where oceanic lithosphere was stronger and heavier than continental ...
... adjustments. Models with various strength profiles represented oceanic lithospheres of different ages. The continental lithosphere reacted to an applied boundary velocity according to the strength and density of oceanic lithosphere. Where oceanic lithosphere was stronger and heavier than continental ...
Petrology and tectonics of Phanerozoic continent formation: From
... how and when island arcs differentiate, how arcs assemble into continents, when the mafic components are removed, and how all of these processes are intertwined. This paper focuses on the global crustal paradox from the perspective of Phanerozoic continent formation. Why have we chosen this perspect ...
... how and when island arcs differentiate, how arcs assemble into continents, when the mafic components are removed, and how all of these processes are intertwined. This paper focuses on the global crustal paradox from the perspective of Phanerozoic continent formation. Why have we chosen this perspect ...
The Central Basin Spreading Center in the Philippine Sea: Structure
... that these characteristics reflect different thermal histories and/or mantle heterogeneity beneath these distinct regions along the CBSC. The NW-SE-trending deep valley and lineaments that are overprinted on the north-south spreading fabric indicate later extension/deformation after the main stage o ...
... that these characteristics reflect different thermal histories and/or mantle heterogeneity beneath these distinct regions along the CBSC. The NW-SE-trending deep valley and lineaments that are overprinted on the north-south spreading fabric indicate later extension/deformation after the main stage o ...
The Central Basin Spreading Center in the Philippine Sea
... that these characteristics reflect different thermal histories and/or mantle heterogeneity beneath these distinct regions along the CBSC. The NW-SE-trending deep valley and lineaments that are overprinted on the north-south spreading fabric indicate later extension/deformation after the main stage o ...
... that these characteristics reflect different thermal histories and/or mantle heterogeneity beneath these distinct regions along the CBSC. The NW-SE-trending deep valley and lineaments that are overprinted on the north-south spreading fabric indicate later extension/deformation after the main stage o ...
Density modeling of the Escollos Alijos Seamount
... 50’N latitude and 115º 34’W longitude, about 300 km off the western continental margin of the Baja California peninsula (Figure 1). The bathymetry shows that the seamount is a compound of two flat-topped edifices, about 60 km by 40 km long at its base, and it sits on the seafloor at a depth of ~ 400 ...
... 50’N latitude and 115º 34’W longitude, about 300 km off the western continental margin of the Baja California peninsula (Figure 1). The bathymetry shows that the seamount is a compound of two flat-topped edifices, about 60 km by 40 km long at its base, and it sits on the seafloor at a depth of ~ 400 ...
Crustal structure of the French Guiana margin
... a rift-type setting. Profile D traverses the northeast margin of the Demerera Plateau, whose evolution gravity, bathymetry and magnetic data suggest is strongly controlled by transform continental break-up associated with the St. Paul Fracture Zone which intersects the margin at this location (Fig. ...
... a rift-type setting. Profile D traverses the northeast margin of the Demerera Plateau, whose evolution gravity, bathymetry and magnetic data suggest is strongly controlled by transform continental break-up associated with the St. Paul Fracture Zone which intersects the margin at this location (Fig. ...
CRUSTAL STRUCTURE OF THE TIBETAN PLATEAU AND ITS
... I determined crustal structures in and around the the Yadong-Gulu rift, the largest north-south-trending rift in southern Tibet, using receiver function techniques and joint-inversion technique with surface wave dispersion data. The results show a narrow zone beneath the rift where the crustal struc ...
... I determined crustal structures in and around the the Yadong-Gulu rift, the largest north-south-trending rift in southern Tibet, using receiver function techniques and joint-inversion technique with surface wave dispersion data. The results show a narrow zone beneath the rift where the crustal struc ...
Abyssal peridotites, very slow spreading ridges and
... suggests a highly segmented crustal structure, with anomalously thin crust near fracture zones that may consist of only a thin veneer of pillow basalt erupted over mantle peridotite. The dredged peridotites underwent high degrees of melting, spanning the range believed to produce abyssal basalt. The ...
... suggests a highly segmented crustal structure, with anomalously thin crust near fracture zones that may consist of only a thin veneer of pillow basalt erupted over mantle peridotite. The dredged peridotites underwent high degrees of melting, spanning the range believed to produce abyssal basalt. The ...
2. Geology and tectonics of the Aegean - diss.fu
... which results in a slip velocity of 24 mm/yr in the North Anatolian Fault (McClusky et al., 2000). This westward motion of Anatolia does not result in a compressional field in the Aegean area, which on the contrary, is dominated by an extensional stress field. Moreover, the Aegean moves as a more or ...
... which results in a slip velocity of 24 mm/yr in the North Anatolian Fault (McClusky et al., 2000). This westward motion of Anatolia does not result in a compressional field in the Aegean area, which on the contrary, is dominated by an extensional stress field. Moreover, the Aegean moves as a more or ...
Post-glacial rebound
Post-glacial rebound (sometimes called continental rebound) is the rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period, through a process known as isostatic depression. Post-glacial rebound and isostatic depression are different parts of a process known as either glacial isostasy, glacial isostatic adjustment, or glacioisostasy. Glacioisostasy is the solid Earth deformation associated with changes in ice mass distribution. The most obvious and direct affects of post-glacial rebound are readily apparent in northern Europe (especially Scotland, Estonia, Latvia, Fennoscandia, and northern Denmark), Siberia, Canada, the Great Lakes of Canada and the United States, the coastal region of the US state of Maine, parts of Patagonia, and Antarctica. However, through processes known as ocean siphoning and continental levering, the effects of post-glacial rebound on sea-level are felt globally far from the locations of current and former ice sheets.