2. Geophysics and the Structure of the Lesser Antilles Forearc
... The accretionary complex can be divided into zones running parallel to the arc, starting with a zone of initial accretion at the front of the complex where sediment is stripped from the ocean floor and the rate of deformation is greatest. This zone passes into one of stabilization where the deformat ...
... The accretionary complex can be divided into zones running parallel to the arc, starting with a zone of initial accretion at the front of the complex where sediment is stripped from the ocean floor and the rate of deformation is greatest. This zone passes into one of stabilization where the deformat ...
L.S. Normore - Department of Natural Resources
... The Random Island map area (NTS 2C/04) was mapped at 1:50 000 during the 2011 field season. This study built on previous work and now provides a more detailed delineation of Late Neoproterozoic to Early Ordovician development of the western Avalon Zone. Superbly exposed cross-sections of volcanic an ...
... The Random Island map area (NTS 2C/04) was mapped at 1:50 000 during the 2011 field season. This study built on previous work and now provides a more detailed delineation of Late Neoproterozoic to Early Ordovician development of the western Avalon Zone. Superbly exposed cross-sections of volcanic an ...
Geothermal gradients in continental magmatic arcs: Constraints from
... Geothermal gradients in continental magmatic arcs example, hydrothermal effects (e.g., Blackwell et al., 1982, 1990; Ingebritsen et al., 1989, 1992) and parameter uncertainty and geometric assumptions (Furlong et al., 1991) complicate the interpretation of heat-flow data. Similarly, estimating geot ...
... Geothermal gradients in continental magmatic arcs example, hydrothermal effects (e.g., Blackwell et al., 1982, 1990; Ingebritsen et al., 1989, 1992) and parameter uncertainty and geometric assumptions (Furlong et al., 1991) complicate the interpretation of heat-flow data. Similarly, estimating geot ...
body waves tomography from obs-recorded earthquakes
... The gulf of Cadiz is a region considered as a complex seismic area, where strong earthquakes occur and where the plate boundary between the African and Eurasian plates is not exactly known. we use high resolution seismic data recorded by a network of ocean bottom seismometers stations in the Gulf of ...
... The gulf of Cadiz is a region considered as a complex seismic area, where strong earthquakes occur and where the plate boundary between the African and Eurasian plates is not exactly known. we use high resolution seismic data recorded by a network of ocean bottom seismometers stations in the Gulf of ...
Email addresses
... and studied directly, deep seated xenoliths from basaltic, kimberlitic and lamproitic extrusions provide important information on the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper ...
... and studied directly, deep seated xenoliths from basaltic, kimberlitic and lamproitic extrusions provide important information on the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper ...
Chapter 6
... by the way sediments were transported to the place where they are deposited. • Sediments are transported by four main agents: water, ice, wind, and the effects of gravity. • The speed with which the agent of erosion moves affects the size of sediment particles that can be carried and the distance th ...
... by the way sediments were transported to the place where they are deposited. • Sediments are transported by four main agents: water, ice, wind, and the effects of gravity. • The speed with which the agent of erosion moves affects the size of sediment particles that can be carried and the distance th ...
Azimuthal anisotropy and phase velocity beneath Iceland
... node. Since mantle anisotropy re£ects deformation the lithosphere and £ow in the asthenosphere and is likely strongly associated with current and historical tectonics, we construct the three sub-regions according to major tectonic provinces in Iceland. They are western Iceland on the North American ...
... node. Since mantle anisotropy re£ects deformation the lithosphere and £ow in the asthenosphere and is likely strongly associated with current and historical tectonics, we construct the three sub-regions according to major tectonic provinces in Iceland. They are western Iceland on the North American ...
Tectonic stress field of the continental United States
... The data base has been considerably enlarged, from 226 to more than 400 points, and we have slightly revised our criteria for reliable tectonic stress field indicators. In addition, all of the data points have been assigned a quality ranking, and a few points have been deleted from the original data ...
... The data base has been considerably enlarged, from 226 to more than 400 points, and we have slightly revised our criteria for reliable tectonic stress field indicators. In addition, all of the data points have been assigned a quality ranking, and a few points have been deleted from the original data ...
Tinos, Cyclades
... ancient ocean crust preserved in ophiolites have provided important insight into the processes of hydrothermal seawater^rock interaction occurring at oceanic spreading centers [1^4]. Typically, it is found that gabbros have N18 O values lower than that of unaltered MORB (5.7 þ 0.2x) [5,6] as a resul ...
... ancient ocean crust preserved in ophiolites have provided important insight into the processes of hydrothermal seawater^rock interaction occurring at oceanic spreading centers [1^4]. Typically, it is found that gabbros have N18 O values lower than that of unaltered MORB (5.7 þ 0.2x) [5,6] as a resul ...
Metamorphism and Metamorphic Rocks
... Different types of foliation. • Rock Cleavage refers to closely spaced flat surfaces along which rocks split into thin slabs when hit with a hammer. • Schistosity is rocks that exhibit a planar or layered structure and the platy minerals are large enough to be seen with the unaided ...
... Different types of foliation. • Rock Cleavage refers to closely spaced flat surfaces along which rocks split into thin slabs when hit with a hammer. • Schistosity is rocks that exhibit a planar or layered structure and the platy minerals are large enough to be seen with the unaided ...
Paleogeography, Southwestern US
... are doubled up and then collide trapping the ophiolites between them. The modern Adaman Sea south of Burma may be an example; the sea is along a transform margin created by oblique collision between the Indian Plate and western SE Asia. No exotic continental block is involved in the tectonic sequenc ...
... are doubled up and then collide trapping the ophiolites between them. The modern Adaman Sea south of Burma may be an example; the sea is along a transform margin created by oblique collision between the Indian Plate and western SE Asia. No exotic continental block is involved in the tectonic sequenc ...
International Journal of Advanced Scientific and Technical Research
... Mithakhari sediment group. The second one exists in between Mithakhari and Andaman Flysch sediment group. Both of these contact zones were found to be vertical and smooth. The present study has clearly shown that TEM profiling is highly instrumental in providing data about geological structures wher ...
... Mithakhari sediment group. The second one exists in between Mithakhari and Andaman Flysch sediment group. Both of these contact zones were found to be vertical and smooth. The present study has clearly shown that TEM profiling is highly instrumental in providing data about geological structures wher ...
Regional geophysical setting of the Rio Grande rift
... buoyant response (Bridwell, 1976) to regional density changes in the crust or manGravity data facilitate mapping the gra- tle related to Neogene tectonics. Like the ben border faults, basement structural uplifts, the associated broad gravity lows grain, and deep-crustal and upper-mantle are Neogene ...
... buoyant response (Bridwell, 1976) to regional density changes in the crust or manGravity data facilitate mapping the gra- tle related to Neogene tectonics. Like the ben border faults, basement structural uplifts, the associated broad gravity lows grain, and deep-crustal and upper-mantle are Neogene ...
DOGAMI Open-File Report O-76-05, Preliminary report on the
... pluton and intrusions along the Clackamas River near Austin Hot Springs; (4) a few east-west-trending dikes and stocks of pyroxene diorite, most of which are associated with the Battle Ax intrusive complex; and (5) isolated basalt dikes and plugs, some of which are the cores of eroded older High Cas ...
... pluton and intrusions along the Clackamas River near Austin Hot Springs; (4) a few east-west-trending dikes and stocks of pyroxene diorite, most of which are associated with the Battle Ax intrusive complex; and (5) isolated basalt dikes and plugs, some of which are the cores of eroded older High Cas ...
Relationship between bend‐faulting at trenches and intermediate
... The comparison of a large number of intraplate events from the trench area with intermediate-depth seismicity cannot be carried out at many subduction zones because instrumentally recorded intraplate trench seismicity is scarce or absent. However, in these areas, fault-relief observed on the trench ...
... The comparison of a large number of intraplate events from the trench area with intermediate-depth seismicity cannot be carried out at many subduction zones because instrumentally recorded intraplate trench seismicity is scarce or absent. However, in these areas, fault-relief observed on the trench ...
Geodynpub_files/Taiwan, 1997
... mechanics? There is still no quantitative physical model for this process which by definition is caused by subduction of the continental margin (or early continental subduction). What is the difference between continental subduction and oceanic subduction (or subduction of the oceanic lithosphere)? ...
... mechanics? There is still no quantitative physical model for this process which by definition is caused by subduction of the continental margin (or early continental subduction). What is the difference between continental subduction and oceanic subduction (or subduction of the oceanic lithosphere)? ...
Thematic Article Tethyan ophiolites and Pangea break-up
... (Van Houten 1977; Manspeizer et al. 1978; Emery & Uchupi 1984; Swanson 1986; Manspeizer 1988; Smith & Livermore 1991). Coeval rift magmatism was also developing along both the American and the African margins bordering the Central Atlan- ...
... (Van Houten 1977; Manspeizer et al. 1978; Emery & Uchupi 1984; Swanson 1986; Manspeizer 1988; Smith & Livermore 1991). Coeval rift magmatism was also developing along both the American and the African margins bordering the Central Atlan- ...
Large igneous province
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive), when hot magma extrudes from inside the Earth and flows out. The source of many or all LIPs is variously attributed to mantle plumes or to processes associated with plate tectonics. Types of LIPs can include large volcanic provinces (LVP), created through flood basalt and large plutonic provinces (LPP). Eleven distinct flood basalt episodes occurred in the past 250 million years, creating volcanic provinces, which coincided with mass extinctions in prehistoric times. Formation depends on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexisting climate state, and the biota resilience to change.