Scientific Ocean Drilling of Mid-Ocean Ridge and Ridge
... processes, the seawater-crust chemical exchange and heat flux, and the diversity of subseafloor microbiology. The remainder of the morning of Day 1 was devoted to talks on the engineering and technology of ocean crustal drilling, including an overview of the history of DSDP/ODP/IODP projects, new te ...
... processes, the seawater-crust chemical exchange and heat flux, and the diversity of subseafloor microbiology. The remainder of the morning of Day 1 was devoted to talks on the engineering and technology of ocean crustal drilling, including an overview of the history of DSDP/ODP/IODP projects, new te ...
Exhumation of (ultra-)high-pressure terranes: concepts
... Abstract. The formation and exhumation of high and ultrahigh-pressure, (U)HP, rocks of crustal origin appears to be ubiquitous during Phanerozoic plate subduction and continental collision events. Exhumation of (U)HP material has been shown in some orogens to have occurred only once, during a single ...
... Abstract. The formation and exhumation of high and ultrahigh-pressure, (U)HP, rocks of crustal origin appears to be ubiquitous during Phanerozoic plate subduction and continental collision events. Exhumation of (U)HP material has been shown in some orogens to have occurred only once, during a single ...
PDF
... uses seismic velocity information from many ray paths, crisscrossing Earth between various points near Earth’s surface and reaching different depths in its interior, to produce a three-dimensional (3-D) model of relative velocity. Regions of anomalously fast mantle corre- ...
... uses seismic velocity information from many ray paths, crisscrossing Earth between various points near Earth’s surface and reaching different depths in its interior, to produce a three-dimensional (3-D) model of relative velocity. Regions of anomalously fast mantle corre- ...
Upper mantle flow in the western Mediterranean
... base, generally around 80–90 km deep, is interpreted to be much shallower (around 50 km) below the Cenozoic Massif Central alkaline volcanic province. Since the crust is not thinned accordingly, the volcanism and the asthenosphere upwelling are interpreted in literature as a thermal effect due to th ...
... base, generally around 80–90 km deep, is interpreted to be much shallower (around 50 km) below the Cenozoic Massif Central alkaline volcanic province. Since the crust is not thinned accordingly, the volcanism and the asthenosphere upwelling are interpreted in literature as a thermal effect due to th ...
Practice Quiz for Ch. 15 Multiple Choice Identify the choice that best
... ____ 26. The earth's crust consists of continental crust and oceanic crust. ____ 27. Tectonic plates float on a sea of lava or molten rock. ____ 28. A subduction zone is associated with a transform fault. ____ 29. The United States, Canada, Russia, South Africa, and Australia supply most of the nonr ...
... ____ 26. The earth's crust consists of continental crust and oceanic crust. ____ 27. Tectonic plates float on a sea of lava or molten rock. ____ 28. A subduction zone is associated with a transform fault. ____ 29. The United States, Canada, Russia, South Africa, and Australia supply most of the nonr ...
Plumes and Hotspots
... with the adjacent mantle, its buoyancy flux, kinematic viscosity of the lower mantle, and the height of ascent from the origin, with the last one being the most important factor. 4. Plume heads stalled at the base of the lithosphere should be seismically detectable for ca. 100 my, and remain hot for ...
... with the adjacent mantle, its buoyancy flux, kinematic viscosity of the lower mantle, and the height of ascent from the origin, with the last one being the most important factor. 4. Plume heads stalled at the base of the lithosphere should be seismically detectable for ca. 100 my, and remain hot for ...
Linking collisional and accretionary orogens during Rodinia
... by extensional stresses resulting from the development of encircling and retreating subduction zones (“top-down”) or from the generation of mantle plumes and hot spots within the supercontinent (“bottom-up”)? Most recent work, based on the break-up of Pangea (Buiter and Torsvik, 2014; Keppie, 2015a, ...
... by extensional stresses resulting from the development of encircling and retreating subduction zones (“top-down”) or from the generation of mantle plumes and hot spots within the supercontinent (“bottom-up”)? Most recent work, based on the break-up of Pangea (Buiter and Torsvik, 2014; Keppie, 2015a, ...
The OIB paradox - Do plumes exist?
... (Hémond et al., 1993; Thirlwall et al., 2004) but there is strong Pb-isotope and trace-element evidence that the depleted component is not derived from the ambient upper mantle but instead forms an intrinsic part of the Iceland plume (Thirlwall, 1995; Fitton et al., 1997, 2003). This being so, Icel ...
... (Hémond et al., 1993; Thirlwall et al., 2004) but there is strong Pb-isotope and trace-element evidence that the depleted component is not derived from the ambient upper mantle but instead forms an intrinsic part of the Iceland plume (Thirlwall, 1995; Fitton et al., 1997, 2003). This being so, Icel ...
Fulltext - ETH E-Collection
... The Apuseni-Banat-Timok-Srednogorie (ABTS) magmatic arc in southeastern Europe formed as a result of NE-dipping subduction of the Neotethys ocean beneath the European continental margin during the Late Cretaceous. This magmatic arc is associated with some of Europe’s largest porphyry Cu-Au and epith ...
... The Apuseni-Banat-Timok-Srednogorie (ABTS) magmatic arc in southeastern Europe formed as a result of NE-dipping subduction of the Neotethys ocean beneath the European continental margin during the Late Cretaceous. This magmatic arc is associated with some of Europe’s largest porphyry Cu-Au and epith ...
Geodynamics Workshop 2012 PROGRAM AND ABSTRACTS
... Recently, it was shown [3] that a thermo-chemical plume, which contains a fraction of 10-20% of eclogitic material derived from recycled oceanic crust, explains the observations much better. Due to the high eclogite density, these thermo-chemical plumes have lower buoyancy and thus generate much sma ...
... Recently, it was shown [3] that a thermo-chemical plume, which contains a fraction of 10-20% of eclogitic material derived from recycled oceanic crust, explains the observations much better. Due to the high eclogite density, these thermo-chemical plumes have lower buoyancy and thus generate much sma ...
Grand Challenges in Geodynamics
... Comparative planetology has advanced the idea that the long-term evolution of a terrestrial planet may be dictated, or at least strongly influenced, by events occurring within the first 50-100 Ma of its formation. Relative to the modern Earth, the energy available for heating Earth’s interior was or ...
... Comparative planetology has advanced the idea that the long-term evolution of a terrestrial planet may be dictated, or at least strongly influenced, by events occurring within the first 50-100 Ma of its formation. Relative to the modern Earth, the energy available for heating Earth’s interior was or ...
High-Sr Volcanic Domes from the Lassen
... A petrogenetic model is offered that demonstrates that: 1) BM basaltic andesites are related to regional low (Sr/P)N magmas, 2) BM andesites can be generated through fractional crystallization of BM basaltic andesites; 3) OB dacites are thought to be generated by partial melting of amphibolitic l ...
... A petrogenetic model is offered that demonstrates that: 1) BM basaltic andesites are related to regional low (Sr/P)N magmas, 2) BM andesites can be generated through fractional crystallization of BM basaltic andesites; 3) OB dacites are thought to be generated by partial melting of amphibolitic l ...
Orogenic Belts and Orogenic Sediment Provenance
... Global tectonics is considered here as fundamentally controlled by Earth’s rotation, with lithospheric plates drifting westward with respect to the mantle (Bostrom 1971; Dickinson 1978; Scoppola et al. 2006). Plate motions follow a sinusoidal flow, oriented roughly westward in the Atlantic Ocean but ...
... Global tectonics is considered here as fundamentally controlled by Earth’s rotation, with lithospheric plates drifting westward with respect to the mantle (Bostrom 1971; Dickinson 1978; Scoppola et al. 2006). Plate motions follow a sinusoidal flow, oriented roughly westward in the Atlantic Ocean but ...
Tectonic–climatic interaction
Tectonic–climatic interaction is the interrelationship between tectonic processes and the climate system. The tectonic processes in question include orogenesis, volcanism, and erosion, while relevant climatic processes include atmospheric circulation, orographic lift, monsoon circulation and the rain shadow effect. As the geological record of past climate changes over millions of years is sparse and poorly resolved, many questions remain unresolved regarding the nature of tectonic-climate interaction, although it is an area of active research by geologists and palaeoclimatologists.