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  • Role of recycled oceanic basalt and sediment in generating

     · We carried out a Monte Carlo simulation to generate 50 000 mixtures of oceanic basalt and associated sediments created at different times. The proportion of sediment in the sediment–basalt mixture

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  • Oceanic Ridge BasaltsGeokem

     · THE OCEANIC RIDGE BASALTS. The floors of the major ocean basins of the world including the North and South Atlantic the North and South Pacific and the Indian Oceans as well as the Red Sea the Labrador Sea and Baffin Bay are almost entirely composed of a 7-10 km-thick layer of tholeiitic basalt overlain by a thin wedge of marine sediment which is nowhere more than Jurassic in age.

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  • (PDF) Role of recycled oceanic basalt and sediment in

    Role of recycled oceanic basalt and sediment in generating the Hf–Nd mantle array. Download. Related Papers. Hafnium isotopes in basalts from the southern Mid-Atlantic Ridge from 40°S to 55°S Discovery and Shona plume-ridge interactions and the role of recycled sediments.

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  • Basalt — Seawater Interaction SpringerLink

    The upper part of the igneous oceanic basement consists of basaltic lava. This basalt undergoes reaction with seawater over a range of temperatures time and locale.

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  • Oceanic island geology Britannica

    2 days ago · Other articles where Oceanic island is discussed Atlantic Ocean Islands of the Atlantic Ocean Among purely oceanic islands (i.e. those without any foundation of continental rock usually formed as the result of volcanic action) are Iceland the Azores Ascension St. Helena Tristan da Cunha Bouvet and Gough which all rise from the Mid-Atlantic Ridge and the Canary

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  • Magnetic alteration of zero-age oceanic basalt Academic

     · 1996 Articles. Magnetic alteration of zero-age oceanic basalt. Kent Dennis V. Gee Jeffrey S. The youngest sampled submarine lava flow which erupted June 1993 on the Juan de Fuca Ridge provides the basis for a tight constraint on the initial or zero-age magnetization state of MORB.

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  • Magnetic alteration of zero-age oceanic basaltNASA/ADS

    Magnetic alteration of zero-age oceanic basalt. The youngest sampled submarine lava flow which erupted June 1993 on the Juan de Fuca Ridge provides the basis for a tight constraint on the initial or zero-age magnetization state of MORB. Detailed profiles of magnetic hysteresis parameters Curie temperatures and unblocking temperatures of NRM

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  • Oceanic basalt continuous thermal demagnetization

     · A simple description of oceanic basalt magnetomineralogy starts with a primary titanomagnetite Fe 3−x Ti x O 4 with x≈0.6 (also known as TM60) with some minor other cations (e.g. Al Mg) crystallizing in the cooling lava. The high cooling rate of the sea water quenched magma inhibits deuteric oxidation (typically occurring at temperatures

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  • Ocean Island Basaltan overview ScienceDirect Topics

    OIBs are commonly olivine-bearing lavas with subalkalic (tholeiitic) and alkalic compositions. Some large ocean islands such as Hawaii and Iceland are dominantly composed of tholeiitic basalts and their derivatives with small amounts of alkalic rocks at later stages of eruptive sequences.

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  • BasaltIgneous rocks

    Basalt is the source rock of other more evolved volcanic rocks like dacite rhyolite etc. Basalt pebbles near the southern tip of La Palma slowly transforming into black sand typical to volcanic oceanic islands. Basalt sample collected near the Giant s Causeway Northern Ireland. Width of sample 8 cm.

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  • Nuclear georeactor origin of oceanic basalt 3He/4He

     · One shortcoming of oceanic basalt helium isotopic measurements is that the time of formation of the helium is unknown. But from Fig. Fig.1 1 one can see that helium time of formation is important for assessing the time of demise of the georeactor. Efforts should be made to address that shortcoming such as described below.

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  • Basalt — Seawater Interaction SpringerLink

    The upper part of the igneous oceanic basement consists of basaltic lava. This basalt undergoes reaction with seawater over a range of temperatures time and locale. This reaction is a major source and sink for various ions in seawater and is a major process in buffering seawater composition and forming metalliferous ores in the marine

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  • Microbes in Oceanic BasaltOffice of Ocean Exploration

    Microbes in Oceanic Basalt. Martin Fisk Ph.D. Professor College of Oceanic and Atmospheric Sciences Oregon State University. Microbes live in most environments where water is present and the temperature is less than 100°C. Other requirements for life are carbon essential nutrients such as phosphorus and nitrogen and a source of energy.

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  • Velocity-porosity relationships in oceanic basalt from

     · Velocity-porosity relationships in oceanic basalt from eastern flank of the Juan de Fuca Ridge The effect of crack closure on seismic velocity Takeshi Tsuji1 3 Gerardo J. Iturrino2 1Department of Civil and Earth Resources Engineering Kyoto University

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  • Oceanic Island Basalts and Mantle Plumes The

     · Oceanic island basalt (OIB) the basaltic lava typically erupted by oceanic island and many seamount volcanoes Mid-ocean ridge basalt (MORB) the basaltic lava typically erupted on mid-ocean ridges Hot spot persistent volcanism over considerable periods of time at fixed location despite plate motion hot spots are the surface manifestation of

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  • 32. MAGNETIC PROPERTIES OF OCEANIC BASALT

     · bilities of all oceanic basalt specimens from Sites 265 266 267 and 274. The ratios of these two parameters (Qn) generally lie between 1 and 20. 267 intensities are very low while Core 45 of Site 274 has much higher than average intensities. The intensity variations are also reflected in the Königsberger ratio QB. For satisfactory

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  • Geochemical fingerprinting of oceanic basalts with

     · Two geochemical proxies are particularly important for the identification and classification of oceanic basalts the Th–Nb proxy for crustal input and hence for demonstrating an oceanic non-subduction setting and the Ti–Yb proxy for melting depth and hence for indicating mantle temperature and thickness of

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  • (PDF) Chemical and isotopic systematics of oceanic basalts

     · Abstract and Figures Trace-element data for mid-ocean ridge basalts (MORBs) and ocean island basalts (OIB) are used to formulate chemical systematics for oceanic basalts.

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  • Microbes in Oceanic BasaltOffice of Ocean Exploration

    A vast part of the ocean floor is composed of basalt that has erupted on mid-ocean ridge volcanoes or on isolated volcanoes that form seamounts. Microorganisms appear to attack these volcanic rocks. Microbes are key to the creation of oceanic volcanic rocks. This image shows the volcanic glass (white) that formed as lava erupted into the ocean.

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  • Mantle Heterogeneity and Melting Processes in the South

     · Mantle Heterogeneity and Melting Processes in the South China Sea Thermal and Melting Models Constrained by Oceanic Crustal Thickness and Basalt Geochemistry

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  • Igneous Rocks Plate TectonicsTulane University

     · The basalt tetrahedron can be divided into three compositional volumes separated by planes. The plane Cpx-Plag-Opx is the critical plane of silica saturation. Compositions that contain Qtz in their norms plot in the volume Cpx-Plag- Opx-Qtz and would be considered silica oversaturated.

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  • Ultrasonic P‐ and S‐wave attenuation in oceanic basalt

     · Although laboratory investigations of attenuation in oceanic basalt are sparse in general many field studies have concentrated on elastic wave absorption in both continental and oceanic basalt. Here we present a brief review of studies conducted on basalts from which the current study is an extension.

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  • Oceanic Island basaltsSummaryGeokem

     · However as with the oceanic basalts most element pairs have definite and sharp boundaries. One bound seems to be the most tholeiitic basalt. Possibly the other is the most alkaline basanite but this is a matter which needs a good deal of investigation yet (August 2004)

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  • Estimation of thermal conductivity change of basalt with

    These new temperature and pressure effect data for oceanic crust basalt fill a gap in the research. The estimated thermal conductivity of the basalt at in-situ temperature and pressure conditions was less than 2 Wm-1K-1 although deformation and alteration associated with subduction could decrease pore spaces in the basalt leading to enhanced

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  • Magnetic alteration of zero-age oceanic basalt Geology

     · Magnetic alteration of zero-age oceanic basalt Dennis V. Kent Dennis V. Kent 1. Lamont-Doherty Earth Observatory Palisades New York 10964. Search for other works by this author on GSW. Google Scholar. Jeff Gee. Jeff Gee 2. Scripps Institution of Oceanography La Jolla California 92093.

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  • Basalt Igneous RockPictures Definition Uses More

    Oceanic Hotspots. Another location where significant amounts of basalt are produced is above oceanic hotspots. These are locations (see map above) where a small plume of hot rock rises up through the mantle from a hotspot on Earth s core. The Hawaiian Islands are an example of where basaltic volcanoes have been built above an oceanic hotspot.

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  • Carbon dioxide sequestration in deep-sea basalt PNAS

     · Deep-Sea Basalt and CO 2. Deep-sea basalt offers a unique environment for CO 2 sequestration that combines both vast volumes of seawater-filled pore space and Mg-Ca silicate rocks ().Within deep-sea basalt aquifers the injected CO 2 mixes with seawater and reacts with basalt both of which are rich in alkaline-earth elements. The release of Ca 2 and Mg 2 ions from basalt will form

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  • Oceanic crust geology Britannica

    2 days ago · Oceanic crust the outermost layer of Earth s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges which occur at divergent plate boundaries.. Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers not including the overlying sediment. The topmost layer about 500 metres (1 650 feet) thick includes lavas made of basalt (that

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  • Oceanic crust geology Britannica

    2 days ago · Oceanic crust the outermost layer of Earth s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges which occur at divergent plate boundaries.. Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers not including the overlying sediment. The topmost layer about 500 metres (1 650 feet) thick includes lavas made of basalt (that

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  • Oceanic Ridge BasaltsGeokem

     · These oceanic basalts are of unique composition with a completely different fingerprint and chemical characteristics to any basalts which may occur in the continental environment. As they total some 60 of all crustal rocks their nature and variation is of extreme importance.

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  • Origin of Basaltic MagmaUniversity at Buffalo

     · Oceanic Basalt Spider Diagram increasing incompatibility Spider diagram for a typical alkaline ocean island basalt (OIB) and tholeiitic mid-ocean ridge basalt (MORB). From Winter (2001) REE Data for UM Xenoliths Chondrite-normalized REE diagrams

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  • (PDF) Role of recycled oceanic basalt and sediment in

     · Here we model the Hf-Nd isotopic composition of oceanic basalts as a mixture of recycled oceanic crust and depleted mantle and find that recycling of basalt alone is not sufficient to reproduce

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  • Oceanic Island Basalts and Mantle Plumes The Geochemical

     · Mantle plumes—which are usually but not always chemically distinct from the mid-ocean ridge basalt (MORB)—may be rooted in the core-mantle boundary and begin with large voluminous heads triggering massive eruptions or be headless and arise in the mid-mantle. Geochemistry provides convincing evidence that mantle plumes are 100–300°C hotter than normal upper mantle and that

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  • Oceanic crust generated by elusive parents Sr and Nd

     · Given that oceanic basalts form by partial melting of mantle peridotites that rise below mid-ocean ridges peridotite and basalt should have identical Sr and Nd isotope ratios. We tested this concept on parallel sets of peridotites and basalts sampled from an exposed section of lithosphere representing 20 m.y. of accretion at the Mid-Atlantic

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  • Oceanic Ridge BasaltsGeokem

     · THE OCEANIC RIDGE BASALTS. The floors of the major ocean basins of the world including the North and South Atlantic the North and South Pacific and the Indian Oceans as well as the Red Sea the Labrador Sea and Baffin Bay are almost entirely composed of a 7-10 km-thick layer of tholeiitic basalt

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  • Basaltic Gabbroic RocksTulane University

     · Oceanic Ridgesthese are the oceanic spreading centers where a relatively small range of chemical compositions of basalts are erupted to form the basaltic layer of the oceanic crust. This chemical type of basalt is referred to as Mid Ocean Ridge Basalts (MORBs).

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