![Notes : Motion of the Lithosphere](http://s1.studyres.com/store/data/003442178_1-80688e090669531ac672d75d2d97f2da-300x300.png)
Notes : Motion of the Lithosphere
... continental crust, the oceanic crust is pulled under • this process is called subduction ...
... continental crust, the oceanic crust is pulled under • this process is called subduction ...
(43.5-46°S): Implications for Magma Genesis
... below Palena may be only as deep as 110 km. Ignoring these uncertainties in slab depth below the volcanic front and back-arc MEC in this region of the SSVZ, it is still clear that the LA Palena group basalts occur at about the same distance behind the volcanic front and at the very same depth above ...
... below Palena may be only as deep as 110 km. Ignoring these uncertainties in slab depth below the volcanic front and back-arc MEC in this region of the SSVZ, it is still clear that the LA Palena group basalts occur at about the same distance behind the volcanic front and at the very same depth above ...
Subduction of the Rivera plate beneath the Jalisco block as imaged
... the Barra de Navidad fault (Figure 1a), and the submarine portion of the Manzanillo graben (Bourgois et al., 1988) have been proposed as part of these limits. The JB can be divided into two domains based on the lithology of the exposed rocks. These are referred to as the southwestern and northeaster ...
... the Barra de Navidad fault (Figure 1a), and the submarine portion of the Manzanillo graben (Bourgois et al., 1988) have been proposed as part of these limits. The JB can be divided into two domains based on the lithology of the exposed rocks. These are referred to as the southwestern and northeaster ...
Full-fit reconstructions of the southern Australian margin
... The sedimentary basins along the southern Australian and conjugate Antarctic margins formed as a result of Mesozoic rifting. A number of alternative models have been proposed for the pre-rift configuration of Australia and Antarctica. They differ both in how tight the fit between these continents is ...
... The sedimentary basins along the southern Australian and conjugate Antarctic margins formed as a result of Mesozoic rifting. A number of alternative models have been proposed for the pre-rift configuration of Australia and Antarctica. They differ both in how tight the fit between these continents is ...
EXPANSION TECTONICS: An Overview
... to conclude “terrestrial expansion brought about the splitting and gradual dispersal of continents as they moved radially outwards during geological time”. The perceived failings and short falls of each of these theories, however, eventually led to an acceptance of Plate Tectonic theory in the 1960 ...
... to conclude “terrestrial expansion brought about the splitting and gradual dispersal of continents as they moved radially outwards during geological time”. The perceived failings and short falls of each of these theories, however, eventually led to an acceptance of Plate Tectonic theory in the 1960 ...
from Oceanography, M.G. Gross, Prentice Hall
... land. Most rocks originally formed at high temperatures and pressures in the absence of free oxygen and with little liquid water. These rocks break down at the earth' s surfacedue to chemical and physical processes known as weathering. Soluble constituents are released and carried to the ocean, diss ...
... land. Most rocks originally formed at high temperatures and pressures in the absence of free oxygen and with little liquid water. These rocks break down at the earth' s surfacedue to chemical and physical processes known as weathering. Soluble constituents are released and carried to the ocean, diss ...
Evidence and implications for a widespread magmatic shutdown for
... Scandinavia), they are few in number (Condie et al., 2005, 2009; Wang et al., 2009) (Figs. 1 and 2). The only possible age peak in this time window (at about 2.35 Ga) is recorded in detrital zircon ages from Africa and Europe (Mapeo et al., 2006), and possibly as a small granitoid age peak in South ...
... Scandinavia), they are few in number (Condie et al., 2005, 2009; Wang et al., 2009) (Figs. 1 and 2). The only possible age peak in this time window (at about 2.35 Ga) is recorded in detrital zircon ages from Africa and Europe (Mapeo et al., 2006), and possibly as a small granitoid age peak in South ...
Incremental Emplacement of Nelson Batholith
... error). These coeval samples range in SiO2 content between 52.74 and 71.07 wt.% with linear correlation of other major and minor elements indicating a co-genetic connection through differentiation and fractional crystallization. The younger sample, #30, lies in the middle of the fractionation trend ...
... error). These coeval samples range in SiO2 content between 52.74 and 71.07 wt.% with linear correlation of other major and minor elements indicating a co-genetic connection through differentiation and fractional crystallization. The younger sample, #30, lies in the middle of the fractionation trend ...
subduction dynamics and mantle tomography beneath japan
... Philippine Sea (cross section C-C’) slabs are revealed by a high P-wave velocity contrast. Blue colors represent faster than average seismic velocities, which are related to the colder subducting Pacific and Philippine Sea slabs. Gray dots shown in cross-sections represent the Pacific and Philippine ...
... Philippine Sea (cross section C-C’) slabs are revealed by a high P-wave velocity contrast. Blue colors represent faster than average seismic velocities, which are related to the colder subducting Pacific and Philippine Sea slabs. Gray dots shown in cross-sections represent the Pacific and Philippine ...
Surface volcanism data since 400 Ma as a constraint of mantle
... • Test: If the density contrast beneath South America for depth larger than 1400 km is zero: ...
... • Test: If the density contrast beneath South America for depth larger than 1400 km is zero: ...
Metamorphic reworking of a high - Lamont
... strongly overprinted by a lower pressure assemblage and, along with associated HP/LT rocks, give much younger 40Ar/39Ar ages of 88–55 Ma indicating a later amphibolite facies metamorphic event. We propose therefore that all serpentinite hosted eclogites along the Motagua fault formed at essentially ...
... strongly overprinted by a lower pressure assemblage and, along with associated HP/LT rocks, give much younger 40Ar/39Ar ages of 88–55 Ma indicating a later amphibolite facies metamorphic event. We propose therefore that all serpentinite hosted eclogites along the Motagua fault formed at essentially ...
Exercises in basic isostasy
... Assuming that oceanic lithosphere everywhere has the same vertical structure, use a Pratt-type model of isostasy to estimate the average density difference between lithospheric mantle at the ridge and lithospheric mantle below the basin. Assume a compensation depth of 130 km below sea-level, average ...
... Assuming that oceanic lithosphere everywhere has the same vertical structure, use a Pratt-type model of isostasy to estimate the average density difference between lithospheric mantle at the ridge and lithospheric mantle below the basin. Assume a compensation depth of 130 km below sea-level, average ...
BASIN TYPES ACCORDING TO TECTONIC by Prof. Dr. Abbas
... basin was predominantly a site of carbonate sedimentation. Basal sands and thin evaporites are overlain by deep-water Upper Cretaceous and Palaeocene shales. These are thickest in intrabasinal troughs, while reefal carbonates were deposited on adjacent horsts. Throughout the Eocene the Sirte embayme ...
... basin was predominantly a site of carbonate sedimentation. Basal sands and thin evaporites are overlain by deep-water Upper Cretaceous and Palaeocene shales. These are thickest in intrabasinal troughs, while reefal carbonates were deposited on adjacent horsts. Throughout the Eocene the Sirte embayme ...
Seismic re¯ection image revealing offset of Andean subduction
... The acquisition of the near-vertical incidence part of the experiment resulted in 65 split-spread shotgathers (records along geophone line), each with a length of ,50 km. Re¯ections in the forearc are much more pronounced than in the backarc. A time section shotgather from a Quebrada Blanca mine bla ...
... The acquisition of the near-vertical incidence part of the experiment resulted in 65 split-spread shotgathers (records along geophone line), each with a length of ,50 km. Re¯ections in the forearc are much more pronounced than in the backarc. A time section shotgather from a Quebrada Blanca mine bla ...
FIELD GUIDE AND ROAD LOG Part 1: Eastern Santa Monica
... potential hydrocarbon source and reservoir rocks. The Monterey formation, full of diatoms, was deposited in the ideal conditions for becoming oil, rapid burial and the right geothermal gradient. The sand layers that were deposited near the diatomaceous layers became good reservoir rocks. Tectonics: ...
... potential hydrocarbon source and reservoir rocks. The Monterey formation, full of diatoms, was deposited in the ideal conditions for becoming oil, rapid burial and the right geothermal gradient. The sand layers that were deposited near the diatomaceous layers became good reservoir rocks. Tectonics: ...
Ridge subduction and porphyry copper
... connected to adakites [4–6, 62, 63]. In China, the Tongling, Shaxi, Dexing porphyry or skarn Cu deposits are all associated with adakite or adakitic rocks [12, 46, 47, 64–66]. It has even been proposed that adakite should be taken as an exploration target for Cu deposits [67]. The genetic connection ...
... connected to adakites [4–6, 62, 63]. In China, the Tongling, Shaxi, Dexing porphyry or skarn Cu deposits are all associated with adakite or adakitic rocks [12, 46, 47, 64–66]. It has even been proposed that adakite should be taken as an exploration target for Cu deposits [67]. The genetic connection ...
- ResearchOnline@JCU
... amphibole overgrowths on omphacite. Type II eclogites are light in colour and are distinguished by their large splays of clinozoisite, omphacite, amphibole and paragonite. Idioblastic garnets contain inclusions of glaucophane and lawsonite indicating prior metamorphism under blueschist-facies condit ...
... amphibole overgrowths on omphacite. Type II eclogites are light in colour and are distinguished by their large splays of clinozoisite, omphacite, amphibole and paragonite. Idioblastic garnets contain inclusions of glaucophane and lawsonite indicating prior metamorphism under blueschist-facies condit ...
Mantle flow through the Northern Cordilleran slab window revealed
... Motions of the Earth’s tectonic plates affect flow patterns in the upper mantle (Wiens et al., 2008). In turn, these flow patterns affect the thermal, physical, and chemical evolution of the plates; the most striking examples are located in slab window environments. Slab windows are gaps between sub ...
... Motions of the Earth’s tectonic plates affect flow patterns in the upper mantle (Wiens et al., 2008). In turn, these flow patterns affect the thermal, physical, and chemical evolution of the plates; the most striking examples are located in slab window environments. Slab windows are gaps between sub ...
Deep crustal structure along the Niigata-Kobe Tectonic Zone, Japan:
... and Honkura (2004) detected a deep crustal conductor beneath the volcanic region at the west of the ISTL. These observations may suggest the existence of the magmatic fluids in the lower crust and uppermost mantle under a possible high temperature condition. It is inferred that the low-velocity anom ...
... and Honkura (2004) detected a deep crustal conductor beneath the volcanic region at the west of the ISTL. These observations may suggest the existence of the magmatic fluids in the lower crust and uppermost mantle under a possible high temperature condition. It is inferred that the low-velocity anom ...
Crust-mantle structures and Neogene
... crust (Furlong and Fountain, 1986). They are generally interpreted as underplating of heavy mafic melts extracted by a hot mantle plume (Bonatti and Seyer, 1987). Therefore, the crustmantle transition along the western margin of the Apenninic range can no longer be interpreted as an example of crust ...
... crust (Furlong and Fountain, 1986). They are generally interpreted as underplating of heavy mafic melts extracted by a hot mantle plume (Bonatti and Seyer, 1987). Therefore, the crustmantle transition along the western margin of the Apenninic range can no longer be interpreted as an example of crust ...
ferrari answers
... intrinsically a 3D process and I proposed that the detachment propagated to the east and produced a migrating pulse of mafic volcanism. 3. What is the reason for the abrupt change for flat to steep subduction in the Cocos plate? Why is the Cocos plate more difficult to subduct than the Rivera plate? ...
... intrinsically a 3D process and I proposed that the detachment propagated to the east and produced a migrating pulse of mafic volcanism. 3. What is the reason for the abrupt change for flat to steep subduction in the Cocos plate? Why is the Cocos plate more difficult to subduct than the Rivera plate? ...
Geophysical and Geochemical Approaches
... Introduction: The presence of a broad zone of exhumed mantle at the West Iberia rifted margin is now well documented (e.g., Whitmarsh et al., 2001), but it remains unclear how widespread such margins are. The UK western approaches margin at Goban Spur (Figure 1) represents another generally amagmati ...
... Introduction: The presence of a broad zone of exhumed mantle at the West Iberia rifted margin is now well documented (e.g., Whitmarsh et al., 2001), but it remains unclear how widespread such margins are. The UK western approaches margin at Goban Spur (Figure 1) represents another generally amagmati ...
Seafloor spreading around Australia R. Dietmar Müller, Carmen
... of it), and the Louisiade Plateau Gaina et al. . This extensional regime lasted until a major plate reorganisation at C26 (57.9 Ma). Relative motion between the Australian Plate and Kenn Plateau-Mellish Rise and between the Mellish Rise and the Louisiade Plateau changed from extension to strike-slip ...
... of it), and the Louisiade Plateau Gaina et al. . This extensional regime lasted until a major plate reorganisation at C26 (57.9 Ma). Relative motion between the Australian Plate and Kenn Plateau-Mellish Rise and between the Mellish Rise and the Louisiade Plateau changed from extension to strike-slip ...
Field Geological Observations around Rhein Graben in Germany
... 4-European Cenozoic rift system developed by passive rifting in fore land of Alps and Pyrenees in response to build up of a collision intra plate compressional stress field that permutated in time. 5- During late Eocene initial rifting phase in the area involving reactivation of preexisting late Pal ...
... 4-European Cenozoic rift system developed by passive rifting in fore land of Alps and Pyrenees in response to build up of a collision intra plate compressional stress field that permutated in time. 5- During late Eocene initial rifting phase in the area involving reactivation of preexisting late Pal ...