Dinitrogen fixation in aphotic oxygenated marine environments
... waters of the oligotrophic Levantine Basin (LB) and the Gulf of Aqaba (GA). N2 fixation rates measured from pelagic aphotic waters to depths up to 720 m, during the mixed and stratified periods, ranged from 0.01 nmol N L−1 d−1 to 0.38 nmol N L−1 d−1 . N2 fixation rates correlated significantly with ...
... waters of the oligotrophic Levantine Basin (LB) and the Gulf of Aqaba (GA). N2 fixation rates measured from pelagic aphotic waters to depths up to 720 m, during the mixed and stratified periods, ranged from 0.01 nmol N L−1 d−1 to 0.38 nmol N L−1 d−1 . N2 fixation rates correlated significantly with ...
conference program
... Aqueous sulfate supports widespread anoxic respiratory carbon cycling by microbes. Aqueous sulfide is produced during this process and, when it escapes re-oxidation, it can be sequestered in metallic sulfide minerals for geological timescales. The preferential consumption of 32S-subsituted sulfate d ...
... Aqueous sulfate supports widespread anoxic respiratory carbon cycling by microbes. Aqueous sulfide is produced during this process and, when it escapes re-oxidation, it can be sequestered in metallic sulfide minerals for geological timescales. The preferential consumption of 32S-subsituted sulfate d ...
Can slab melting be caused by flat subduction
... Slab melting has been suggested as a likely source of adakitic arc magmas (i.e., andesitic and dacitic magmas strongly depleted in Y and heavy rare earth elements). Existing numerical and petrologic models, however, restrict partial melting to very young (15Ma) oceanic crust (typically at 60-SO km d ...
... Slab melting has been suggested as a likely source of adakitic arc magmas (i.e., andesitic and dacitic magmas strongly depleted in Y and heavy rare earth elements). Existing numerical and petrologic models, however, restrict partial melting to very young (15Ma) oceanic crust (typically at 60-SO km d ...
American Journal of Science - gemoc
... of radiogenic heat sources. Decrease in the MgO content of komatiites.—The average MgO content of komatiites is one way to track the average eruptive temperature of the magma and of the mantle sources, which are likely mantle plumes (Arndt and others, 2008). Each point on figure 2 is the average MgO ...
... of radiogenic heat sources. Decrease in the MgO content of komatiites.—The average MgO content of komatiites is one way to track the average eruptive temperature of the magma and of the mantle sources, which are likely mantle plumes (Arndt and others, 2008). Each point on figure 2 is the average MgO ...
chemical and physical dynamics of marine - DORAS
... Pockmarks are widespread in the aquatic environment but the understanding of their formation mechanisms, relationship with marine macro- and micro-biota and their geochemistry remains limited. Despite numerous findings of these features in Irish waters they received little attention and remain poorl ...
... Pockmarks are widespread in the aquatic environment but the understanding of their formation mechanisms, relationship with marine macro- and micro-biota and their geochemistry remains limited. Despite numerous findings of these features in Irish waters they received little attention and remain poorl ...
Slab detachment in laterally varying subduction zones: 3D
... and Allen [2011], the role of an inclined margin on the propagation of slab detachment was highlighted, Capitanio and Replumaz [2013] have explored the impact of slab detachment on the curvature of orogenic belts and Li et al. [2013] investigated the role of the collision rate on slab detachment dep ...
... and Allen [2011], the role of an inclined margin on the propagation of slab detachment was highlighted, Capitanio and Replumaz [2013] have explored the impact of slab detachment on the curvature of orogenic belts and Li et al. [2013] investigated the role of the collision rate on slab detachment dep ...
Surface ocean-lower atmosphere study: Scientific synthesis and
... ecosystems in a warmer world will be a decrease in global productivity, resulting from a slowing of the thermohaline circulation. In 1999, SOLAS was still in the developmental stage and actively seeking support from the International Global Atmospheric Chemistry (IGAC) and Joint Global Ocean Flux St ...
... ecosystems in a warmer world will be a decrease in global productivity, resulting from a slowing of the thermohaline circulation. In 1999, SOLAS was still in the developmental stage and actively seeking support from the International Global Atmospheric Chemistry (IGAC) and Joint Global Ocean Flux St ...
FREE Sample Here
... D) Mid-Atlantic Ridge under Iceland Answer: B Diff: 2 38) ________ first related the symmetrical magnetic patterns in seafloor basalts to seafloor spreading at a mid-ocean ridge. A) Evans and Novak B) Vine and Matthews C) Matthews and Marks D) Wegener and Wilson Answer: B Diff: 1 39) Early results o ...
... D) Mid-Atlantic Ridge under Iceland Answer: B Diff: 2 38) ________ first related the symmetrical magnetic patterns in seafloor basalts to seafloor spreading at a mid-ocean ridge. A) Evans and Novak B) Vine and Matthews C) Matthews and Marks D) Wegener and Wilson Answer: B Diff: 1 39) Early results o ...
Carbon and Boundaries in Karst
... a boundary or the processing of carbon: the upper boundary (surface/epikarst), the lower boundary (vadose/phreatic), lateral inputs and outputs, carbon (sources and quality), and microbial processes. For sessions that were organized into boundary zones, the presentations included research designed t ...
... a boundary or the processing of carbon: the upper boundary (surface/epikarst), the lower boundary (vadose/phreatic), lateral inputs and outputs, carbon (sources and quality), and microbial processes. For sessions that were organized into boundary zones, the presentations included research designed t ...
Earth: An Introduction to Physical Geology, 10e (Tarbuck/Lutgens
... D) Mid-Atlantic Ridge under Iceland Answer: B Diff: 2 38) ________ first related the symmetrical magnetic patterns in seafloor basalts to seafloor spreading at a mid-ocean ridge. A) Evans and Novak B) Vine and Matthews C) Matthews and Marks D) Wegener and Wilson Answer: B Diff: 1 39) Early results o ...
... D) Mid-Atlantic Ridge under Iceland Answer: B Diff: 2 38) ________ first related the symmetrical magnetic patterns in seafloor basalts to seafloor spreading at a mid-ocean ridge. A) Evans and Novak B) Vine and Matthews C) Matthews and Marks D) Wegener and Wilson Answer: B Diff: 1 39) Early results o ...
Iodine chemistry reflects productivity and denitrification in the
... surface layer (WOSL) where iodide concentrations were in the range of 158–558 nM, and (2) the oxygen minimum zone (OMZ) where total iodine concentrations [primarily as iodide and in excess to the oceanic iodine/salinity ratio of B13] varied from B200 to 950 nM. Iodine data in the WOSL of the Arabian ...
... surface layer (WOSL) where iodide concentrations were in the range of 158–558 nM, and (2) the oxygen minimum zone (OMZ) where total iodine concentrations [primarily as iodide and in excess to the oceanic iodine/salinity ratio of B13] varied from B200 to 950 nM. Iodine data in the WOSL of the Arabian ...
Earth-9th-Edition-Tarbuck-Test-Bank
... 13) A typical rate of seafloor spreading in the Atlantic Ocean is ________. A) 2 ft per year B) 0.1 inches per year C) 20 feet per year D) 2 centimeters per year Answer: D Diff: 1 ...
... 13) A typical rate of seafloor spreading in the Atlantic Ocean is ________. A) 2 ft per year B) 0.1 inches per year C) 20 feet per year D) 2 centimeters per year Answer: D Diff: 1 ...
Deep-Sea Life
... conditions the habitat complex is found in. Searches based on these results calculated likelihood values across the rest of the map at both fine and broad scale. Areas to validate on the cruise were chosen mainly based on where both models agreed, where the models disagreed, and areas where absences ...
... conditions the habitat complex is found in. Searches based on these results calculated likelihood values across the rest of the map at both fine and broad scale. Areas to validate on the cruise were chosen mainly based on where both models agreed, where the models disagreed, and areas where absences ...
BIOL 181: Life in the Oceans – Lecture Notes
... eighteenth century and early nineteenth century that interest in the marine environment was renewed, fueled by explorations now made possible by better ships and improved navigation techniques. In 1831, Darwin set sail for a five-year circumnavigation on the HMS Beagle, and his observations of organ ...
... eighteenth century and early nineteenth century that interest in the marine environment was renewed, fueled by explorations now made possible by better ships and improved navigation techniques. In 1831, Darwin set sail for a five-year circumnavigation on the HMS Beagle, and his observations of organ ...
Geological Society of America Bulletin
... correspond to the subcontinental mantle and/or to the deeper oceanic mantle, where partial melting is much less intense. Recent studies of ophiolites have shown that both harzburgiteand lherzolite-type peridotites may occur in ophiolites, and that they can be used to classify ophiolite types and the ...
... correspond to the subcontinental mantle and/or to the deeper oceanic mantle, where partial melting is much less intense. Recent studies of ophiolites have shown that both harzburgiteand lherzolite-type peridotites may occur in ophiolites, and that they can be used to classify ophiolite types and the ...
pdf
... vary from region to region. Seventy percent of the global continental shelf has been classified as geologically relict, suggesting that most shelf deposits comprise non-accumulating sands (Fig. I.A.1). Other shallow-water environments are more varied and include deltas, rocky banks, reefs, and emerg ...
... vary from region to region. Seventy percent of the global continental shelf has been classified as geologically relict, suggesting that most shelf deposits comprise non-accumulating sands (Fig. I.A.1). Other shallow-water environments are more varied and include deltas, rocky banks, reefs, and emerg ...
Physiological and phylogenetic studies of thermophilic
... Grensdalur, Hveragerði, SW-Iceland. The strains were investigated with respect to phylogenetics, physiology, hydrogen uptake rates, biomass yield and sulfur metabolism. Phylogenetic studies of the isolates were done with both partial and full 16S rRNA analysis. Two true thermophilic strains were iso ...
... Grensdalur, Hveragerði, SW-Iceland. The strains were investigated with respect to phylogenetics, physiology, hydrogen uptake rates, biomass yield and sulfur metabolism. Phylogenetic studies of the isolates were done with both partial and full 16S rRNA analysis. Two true thermophilic strains were iso ...
IDOE Workshop on Tectonic Patterns and Metallogenesis in East
... The continental margins, small ocean basins and island arc systems of eastern Asia,from the Sunda Arc to the Japanese islands,and from the stable shelfof the Gulf of Thailand to the stable shelf bordering northern Australia, provide one of the most significant regions of the earth's surface for the ...
... The continental margins, small ocean basins and island arc systems of eastern Asia,from the Sunda Arc to the Japanese islands,and from the stable shelfof the Gulf of Thailand to the stable shelf bordering northern Australia, provide one of the most significant regions of the earth's surface for the ...
Subduction zone evolution and deep slab structure
... subduction of the Alpine Tethys since Late Cretaceous caused a very complex plate-boundaryreorganization between seven (micro-) plates. Since the last 45 Ma until today the Alpine Tethys is still consumed by four main still active subduction zones, on which will mainly be focused in this paper: The ...
... subduction of the Alpine Tethys since Late Cretaceous caused a very complex plate-boundaryreorganization between seven (micro-) plates. Since the last 45 Ma until today the Alpine Tethys is still consumed by four main still active subduction zones, on which will mainly be focused in this paper: The ...
Anoxic event
Oceanic anoxic events or anoxic events (Anoxia conditions) refer to intervals in the Earth's past where portions of oceans become depleted in oxygen (O2) at depths over a large geographic area. During some of these events, euxinia develops - euxinia refers to anoxic waters that contain H2S hydrogen sulfide. Although anoxic events have not happened for millions of years, the geological record shows that they happened many times in the past. Anoxic events coincide with several mass extinctions and may contribute to these events. These mass extinctions include some that geobiologists use as time markers in biostratigraphic dating. It is believed oceanic anoxic events are strongly linked to slowing of ocean circulation, climatic warming and elevated levels of greenhouse gases. Enhanced volcanism (through the release of CO2 and other greenhouse gases) is the proposed central external trigger for the development of these events.