Singularity detection of the thin bed seismic signals with wavelet
... data. A wide variety of seismic facies are common in contourites, most of which are equally present in turbidite systems. Seismic facies associations that may be typical of contourites are still to be defined. Seismic characteristics also depend very closely on the methods of seismic acquisition and ...
... data. A wide variety of seismic facies are common in contourites, most of which are equally present in turbidite systems. Seismic facies associations that may be typical of contourites are still to be defined. Seismic characteristics also depend very closely on the methods of seismic acquisition and ...
Geochemistry and petrogenesis of extrusive rocks, dykes and high
... westernNorway (Furnes et al. 1990), where it crops out on a number of islands and skerries in the Solund-Stavfjord area (Fig. 1). A quartz diorite from within a high-level gabbro provided a U-Ph zircon age of 443 ± 3 Ma (Dunning & Pedersen 1988). The part of the SSOC presented here, from the island ...
... westernNorway (Furnes et al. 1990), where it crops out on a number of islands and skerries in the Solund-Stavfjord area (Fig. 1). A quartz diorite from within a high-level gabbro provided a U-Ph zircon age of 443 ± 3 Ma (Dunning & Pedersen 1988). The part of the SSOC presented here, from the island ...
Causes and mechanisms of the 20112012 El Hierro (Canary Islands
... [1] El Hierro eruption started on 10 October 2011 after an unrest episode that initiated on 17 July 2011. This is the first eruption in the Canary Islands that has been tracked in real time. Although being submarine and not directly observable, the data recorded allowed its reconstruction and to iden ...
... [1] El Hierro eruption started on 10 October 2011 after an unrest episode that initiated on 17 July 2011. This is the first eruption in the Canary Islands that has been tracked in real time. Although being submarine and not directly observable, the data recorded allowed its reconstruction and to iden ...
The Cordilleran Ribbon Continent of North America
... In Yukon, Upper Triassic strata from near the Cassiar Platform–Medial Basin boundary includes Epigondolella and Paragondolella—conodont species that are Eurasian. In North America, these species are only known from the exotic Wrangellia terrane of the insular domain (Orchard 2006). Eurasian fauna si ...
... In Yukon, Upper Triassic strata from near the Cassiar Platform–Medial Basin boundary includes Epigondolella and Paragondolella—conodont species that are Eurasian. In North America, these species are only known from the exotic Wrangellia terrane of the insular domain (Orchard 2006). Eurasian fauna si ...
Relationship between seismic and gravity anomalies at
... hotspot, region of unusually intense and persistent volcanism (Bransdόttir et al., 2008). This location makes it a unique place to observe mechanisms resulting both from hot spot magmatism and rifting and study the oceanic crust, thanks to refraction crustal studies. In Iceland the plate boundary is ...
... hotspot, region of unusually intense and persistent volcanism (Bransdόttir et al., 2008). This location makes it a unique place to observe mechanisms resulting both from hot spot magmatism and rifting and study the oceanic crust, thanks to refraction crustal studies. In Iceland the plate boundary is ...
Workshop on the Rio Grande Rift
... A functional definition of the Rio Grande Rift The more or less narrow linear belt extending from Leadville, Colorado, at least to EI Paso, Texas, in which geologic and geophysical evidence suggests that the crust of the earth has been pulled apart and extended beginning about 26 My ago. The rift re ...
... A functional definition of the Rio Grande Rift The more or less narrow linear belt extending from Leadville, Colorado, at least to EI Paso, Texas, in which geologic and geophysical evidence suggests that the crust of the earth has been pulled apart and extended beginning about 26 My ago. The rift re ...
Chapter 3
... (“Ring of Fire”). Nearly 14 percent of the world’s active volcanoes are located in the Indonesian Archipelago. Another 6 percent lie along the Mid-Atlantic Ridge. Africa, the Mediterranean, and Arabian Peninsula regions account for 5 percent. The remainder occur at other plate boundaries within the ...
... (“Ring of Fire”). Nearly 14 percent of the world’s active volcanoes are located in the Indonesian Archipelago. Another 6 percent lie along the Mid-Atlantic Ridge. Africa, the Mediterranean, and Arabian Peninsula regions account for 5 percent. The remainder occur at other plate boundaries within the ...
Thematic Article Oceanic crust and Moho of the Pacific Plate in the
... Plateau, we have analyzed industry-standard two-dimensional multichannel seismic reflection data. To obtain improved velocity models, phase information of seismic signals was used for velocity analysis and velocity models for oceanic crust above Moho were determined. We apply this velocity analysis ...
... Plateau, we have analyzed industry-standard two-dimensional multichannel seismic reflection data. To obtain improved velocity models, phase information of seismic signals was used for velocity analysis and velocity models for oceanic crust above Moho were determined. We apply this velocity analysis ...
Printer-friendly Version - Solid Earth Discussions
... the Greek : αi σθενώς – weak). Petrological studies of xenoliths and thermal modelling based on heat flow measurements allow to determine temperature gradients in the lower lithosphere, give some image of lithosphere composition and provide important suggestions about the depth of the wide transiti ...
... the Greek : αi σθενώς – weak). Petrological studies of xenoliths and thermal modelling based on heat flow measurements allow to determine temperature gradients in the lower lithosphere, give some image of lithosphere composition and provide important suggestions about the depth of the wide transiti ...
Seismic Velocity Structure along the Western Segment of the North
... Fig. +. Simplified tectonic map of Turkey, Arabian, African, and Eurasian plates (Provost et al., ,**-). The black arrows show the directions of relative plate velocity, and the thick black line shows the location of the right-lateral strike-slip NAFZ. Epicenters of +1 August +333 Gölcük earthquake ...
... Fig. +. Simplified tectonic map of Turkey, Arabian, African, and Eurasian plates (Provost et al., ,**-). The black arrows show the directions of relative plate velocity, and the thick black line shows the location of the right-lateral strike-slip NAFZ. Epicenters of +1 August +333 Gölcük earthquake ...
3.20 Trace Element and Isotopic Fluxes
... and metamorphism along the subduction pathway. The focus in this contribution is largely on the chemical and isotopic tracers commonly employed to elucidate chemical cycling in subduction zones based on study of arc lavas, and on discussion of metamorphic suites for which it is possible to evaluate ...
... and metamorphism along the subduction pathway. The focus in this contribution is largely on the chemical and isotopic tracers commonly employed to elucidate chemical cycling in subduction zones based on study of arc lavas, and on discussion of metamorphic suites for which it is possible to evaluate ...
CHAPTER 3: Geophysics and lithospheric structure of the Arabian
... caused by identical magnetic sources but with a vertical field and magnetization of the type effectively found at the magnetic pole. The result is to center the magnetic anomaly directly over the causative body, and the benefit for the interpreter is that the shape and position of the anomaly spatia ...
... caused by identical magnetic sources but with a vertical field and magnetization of the type effectively found at the magnetic pole. The result is to center the magnetic anomaly directly over the causative body, and the benefit for the interpreter is that the shape and position of the anomaly spatia ...
A review of observations and models of dynamic
... that we introduce in this study. This comparison shows that the predicted dynamic topography fields are in good agreement at long wavelength, although the predicted amplitudes differ from one model to another. The residual topographies and modeled dynamic topographies are in broad agreement, althoug ...
... that we introduce in this study. This comparison shows that the predicted dynamic topography fields are in good agreement at long wavelength, although the predicted amplitudes differ from one model to another. The residual topographies and modeled dynamic topographies are in broad agreement, althoug ...
Incipient shortening of a passive margin: the mechanical roles of
... Key words: analogue modelling, incipient shortening, obduction, passive margin, post-breakup, strength profiles, subduction. ...
... Key words: analogue modelling, incipient shortening, obduction, passive margin, post-breakup, strength profiles, subduction. ...
Occurrences of disseminated sulphides from
... segments of the NCIR (Drolia et al. 2003; Drolia and DeMets 2005; Kamesh Raju et al. 2012). The NCIR is characterised by short-ridge segments and long transform geometry (maximum displacement at the Vema transform fault is ~243 km). The depth of the seafloor including the axial valley, transform fau ...
... segments of the NCIR (Drolia et al. 2003; Drolia and DeMets 2005; Kamesh Raju et al. 2012). The NCIR is characterised by short-ridge segments and long transform geometry (maximum displacement at the Vema transform fault is ~243 km). The depth of the seafloor including the axial valley, transform fau ...
as a PDF
... ridge system near a triple junction that separated East and West Antarctica between 43 Ma and 28 – 26 Ma (Cande et al. 2000). Recently, Cande and Stock (2005) extended this period of extension back to 61 Ma (Chron 27), based on additional magnetic and bathymetric data from the area northeast of the ...
... ridge system near a triple junction that separated East and West Antarctica between 43 Ma and 28 – 26 Ma (Cande et al. 2000). Recently, Cande and Stock (2005) extended this period of extension back to 61 Ma (Chron 27), based on additional magnetic and bathymetric data from the area northeast of the ...
Experimental_laboratory_files/2004_The source of Granites
... with low 87Sr86/Sr initial ratios are generated from a crustal source that has this particular composition. Comparison with Archaean crust array (Fig. 1a) suggests that tonalites of the lower crust (e.g. Weaver & Tarney 1981) are good candidates to produce Sr isotopic ratios intermediate between man ...
... with low 87Sr86/Sr initial ratios are generated from a crustal source that has this particular composition. Comparison with Archaean crust array (Fig. 1a) suggests that tonalites of the lower crust (e.g. Weaver & Tarney 1981) are good candidates to produce Sr isotopic ratios intermediate between man ...
Contribution of multibeam bathymetry to understanding
... rates where deformation is distributed over broad accreted areas, detailed survey of the MidAtlantic Ridge show much evidence for ridge propagation [Gente et al., 1995]. Propagating ridges are also ubiquitous in back-arc spreading centers, where they accommodate the rapid evolution of an assemblage ...
... rates where deformation is distributed over broad accreted areas, detailed survey of the MidAtlantic Ridge show much evidence for ridge propagation [Gente et al., 1995]. Propagating ridges are also ubiquitous in back-arc spreading centers, where they accommodate the rapid evolution of an assemblage ...
Papers presented to the Conference on Heat and Detachment in
... boundaries. In northern Sonora extensive outcrops of Tgn-s exist between the Mojave-Sonora megashear and a series of straight, northwesterly-trending lineaments which are interpreted as normal faults, orthogonal to the stretching direction, developed in brittle sequences. Within this extensive area ...
... boundaries. In northern Sonora extensive outcrops of Tgn-s exist between the Mojave-Sonora megashear and a series of straight, northwesterly-trending lineaments which are interpreted as normal faults, orthogonal to the stretching direction, developed in brittle sequences. Within this extensive area ...
Origin and consequences of western Mediterranean subduction
... slab relative to Iberia and Eurasia [Lonergan and White, 1997; Faccenna et al., 2004; Spakman and Wortel, 2004; Handy et al., 2010]. During rollback, the length of the Africa-Iberia plate contact increased dramatically. This was associated with stretching and fragmentation of the original, pre-30 Ma ...
... slab relative to Iberia and Eurasia [Lonergan and White, 1997; Faccenna et al., 2004; Spakman and Wortel, 2004; Handy et al., 2010]. During rollback, the length of the Africa-Iberia plate contact increased dramatically. This was associated with stretching and fragmentation of the original, pre-30 Ma ...
Rheological Response to Tectonic and Volcanic
... Rheological response to tectonic and volcanic deformation in Iceland 1. Introduction The 2% of the Mid Oceanic Ridges (MOR) exposed on land provide a natural laboratory to study the exchange of mass between Earth’s interior and its solid crust and/or lithosphere, the so called geodynamic systems (T ...
... Rheological response to tectonic and volcanic deformation in Iceland 1. Introduction The 2% of the Mid Oceanic Ridges (MOR) exposed on land provide a natural laboratory to study the exchange of mass between Earth’s interior and its solid crust and/or lithosphere, the so called geodynamic systems (T ...
Mantle plume
A mantle plume is a mechanism proposed in 1971 to explain volcanic regions of the earth that were not thought to be explicable by the then-new theory of plate tectonics. Some such volcanic regions lie far from tectonic plate boundaries, for example, Hawaii. Others represent unusually large-volume volcanism, whether on plate boundaries, e.g. Iceland, or basalt floods such as the Deccan or Siberian traps.A mantle plume is posited to exist where hot rock nucleates at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. The currently active volcanic centers are known as ""hot spots"". In particular, the concept that mantle plumes are fixed relative to one another, and anchored at the core-mantle boundary, was thought to provide a natural explanation for the time-progressive chains of older volcanoes seen extending out from some such hot spots, such as the Hawaiian–Emperor seamount chain.The hypothesis of mantle plumes from depth is not universally accepted as explaining all such volcanism. It has required progressive hypothesis-elaboration leading to variant propositions such as mini-plumes and pulsing plumes. Another hypothesis for unusual volcanic regions is the ""Plate model"". This proposes shallower, passive leakage of magma from the mantle onto the Earth's surface where extension of the lithosphere permits it, attributing most volcanism to plate tectonic processes, with volcanoes far from plate boundaries resulting from intraplate extension.