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Registered talks and posters, OMARC conference
... Near-surface hydrocarbon anomalies in aerobic sediments off coastal Svalbard Some evidences for the gas hydrate presence in the sediments of barite build –ups (Derugin Basin, Sea of Okhotsk) Hydrogeochemical peculiarities of gas hydrate-forming mud volcano fluids in the Eastern and Western Mediterra ...
... Near-surface hydrocarbon anomalies in aerobic sediments off coastal Svalbard Some evidences for the gas hydrate presence in the sediments of barite build –ups (Derugin Basin, Sea of Okhotsk) Hydrogeochemical peculiarities of gas hydrate-forming mud volcano fluids in the Eastern and Western Mediterra ...
New processes and players in the nitrogen cycle: the microbial
... effectively concealed as denitrification – in other words, an even larger fraction of N loss from anoxic systems may be driven by anammox organisms. In fact, evidence for DNRA has been detected in the Benguela upwelling system (Kartal et al., 2007a), where anammox bacteria actively remove massive am ...
... effectively concealed as denitrification – in other words, an even larger fraction of N loss from anoxic systems may be driven by anammox organisms. In fact, evidence for DNRA has been detected in the Benguela upwelling system (Kartal et al., 2007a), where anammox bacteria actively remove massive am ...
Workshop Report
... The workshop was comprised two main sections – a series of presentations on the current state of ocean acidification globally and in Alaska and examples of climate change adaptation and communication practices – those presentations can be found at http://www.coseealaska.net/oceanacidification/. The ...
... The workshop was comprised two main sections – a series of presentations on the current state of ocean acidification globally and in Alaska and examples of climate change adaptation and communication practices – those presentations can be found at http://www.coseealaska.net/oceanacidification/. The ...
Genesis of Ultra-High Pressure Garnet Pyroxenite in Orogenic
... The major and trace element, and isotopic compositions of the studied Ronda and Beni Bousera UHP garnet pyroxenites lend support to the “Marble Cake Mantle” model [7] for the genesis of these pyroxenites. This model envisions the mantle source of oceanic basalts as a mélange of subducted, ancient oc ...
... The major and trace element, and isotopic compositions of the studied Ronda and Beni Bousera UHP garnet pyroxenites lend support to the “Marble Cake Mantle” model [7] for the genesis of these pyroxenites. This model envisions the mantle source of oceanic basalts as a mélange of subducted, ancient oc ...
Plate Tectonics
... Fossil Plants and Animals Wegener also found evidence for continental drift from fossils (Figure 1.7). The same type of plant and animal fossils are found on continents that are now widely separated. These organisms would not have been able to travel across the oceans. Fossils of the seed fern Gloss ...
... Fossil Plants and Animals Wegener also found evidence for continental drift from fossils (Figure 1.7). The same type of plant and animal fossils are found on continents that are now widely separated. These organisms would not have been able to travel across the oceans. Fossils of the seed fern Gloss ...
Seafloor Spreading
... such as mountain ranges, would have fractured as the continents separated. – Using this reasoning, Wegener hypothesized that there should be areas of similar rock types on opposite sides of the Atlantic Ocean. ...
... such as mountain ranges, would have fractured as the continents separated. – Using this reasoning, Wegener hypothesized that there should be areas of similar rock types on opposite sides of the Atlantic Ocean. ...
Plate Tectonics: Evolution of the Ocean Floor
... been heated by the Earth’s core and radioactive decay within the mantle itself. As a result, it is slightly less dense than the material through which it rises. The upper mantle loses some of its heat by conduction outward through the Earth’s cooler crust. As the upper material cools and contracts, ...
... been heated by the Earth’s core and radioactive decay within the mantle itself. As a result, it is slightly less dense than the material through which it rises. The upper mantle loses some of its heat by conduction outward through the Earth’s cooler crust. As the upper material cools and contracts, ...
Gober Paleoclimatology Presentation.pptx
... Uplift Weathering Hypothesis Uplift is the cause of large-scale climate changes, through both direct physical impacts and indirect biochemical effects ...
... Uplift Weathering Hypothesis Uplift is the cause of large-scale climate changes, through both direct physical impacts and indirect biochemical effects ...
Imaging the Gutenberg Seismic Discontinuity beneath the Oceanic
... 660 km discontinuities are from phase changes in the mineral olivine. Other discontinuities like the one found at the mantle-outer core boundary is from the transition of rock to liquid metal. However, there are several discontinuities other than those listed above that do not necessarily have a cle ...
... 660 km discontinuities are from phase changes in the mineral olivine. Other discontinuities like the one found at the mantle-outer core boundary is from the transition of rock to liquid metal. However, there are several discontinuities other than those listed above that do not necessarily have a cle ...
The peri-Caribbean ophiolites: structure, tectono
... Hispaniola, Venezuela, Dutch and Venezuelan Islands). At the same time, both the South and North American continental margins were affected by rifting and within-plate tholeiitic magmatism (Venezuela and Cuba). From Early to Late Cretaceous (eo-Caribbean phases), one subcontinental subduction zone, ...
... Hispaniola, Venezuela, Dutch and Venezuelan Islands). At the same time, both the South and North American continental margins were affected by rifting and within-plate tholeiitic magmatism (Venezuela and Cuba). From Early to Late Cretaceous (eo-Caribbean phases), one subcontinental subduction zone, ...
Seafloor Spreading and Paleomagnetism
... These studies revealed the existence of an underwater ridge of mountains that completely circled the globe. They also revealed the presence of deep-sea trenches, usually near the margins of continents or island chains around the Pacific, which had a depth of several kilometers (several miles). 2 a) ...
... These studies revealed the existence of an underwater ridge of mountains that completely circled the globe. They also revealed the presence of deep-sea trenches, usually near the margins of continents or island chains around the Pacific, which had a depth of several kilometers (several miles). 2 a) ...
Notes towards Biodiversity Chapter 5
... (Wikipedia Contributors 2006b). The 5 recognised mass extinction events in prehistoric time and the present mass extinction event are marked with red arrows. The fossil record – key to the past The occurrence of fossil-bearing rocks Fossils are usually found in sedimentary rocks. (The picture shows ...
... (Wikipedia Contributors 2006b). The 5 recognised mass extinction events in prehistoric time and the present mass extinction event are marked with red arrows. The fossil record – key to the past The occurrence of fossil-bearing rocks Fossils are usually found in sedimentary rocks. (The picture shows ...
Quantity and bioavailability of sediment organic matter as signatures
... sediment of > 2.5 mg C g–1, being associated with a bioavailable fraction of <10%, can be considered as a threshold level at which benthic consumers may experience mostly refractory organic carbon. KEY WORDS: Marine sediments · Organic matter · Trophic status Resale or republication not permitted wi ...
... sediment of > 2.5 mg C g–1, being associated with a bioavailable fraction of <10%, can be considered as a threshold level at which benthic consumers may experience mostly refractory organic carbon. KEY WORDS: Marine sediments · Organic matter · Trophic status Resale or republication not permitted wi ...
Notes towards Biodiversity Chapter 6
... The fossil record is known to be incomplete because some time periods are poorly represented by sedimentary rock formations (Futuyma 1998, 2005) (The picture shows a sedimentary rock formation in the Grand Canyon, U.S.A.); Lazarus taxa show up at widely separated time intervals (Raup 1988, Futuyma 1 ...
... The fossil record is known to be incomplete because some time periods are poorly represented by sedimentary rock formations (Futuyma 1998, 2005) (The picture shows a sedimentary rock formation in the Grand Canyon, U.S.A.); Lazarus taxa show up at widely separated time intervals (Raup 1988, Futuyma 1 ...
Chapter 8 - Inorganic carbon chemistry
... space but the 'greenhouse gases', including carbon dioxide, prevent it from escaping. This effect is similar to that observed in a greenhouse where sunlight (visible/ultraviolet radiation) enters through the glass panes but heat (infrared radiation) has difficulty escaping through the glass. The lon ...
... space but the 'greenhouse gases', including carbon dioxide, prevent it from escaping. This effect is similar to that observed in a greenhouse where sunlight (visible/ultraviolet radiation) enters through the glass panes but heat (infrared radiation) has difficulty escaping through the glass. The lon ...
Sea Floor Spreading and Plate Tectonics
... 1. The ages of the rocks that make up the seafloor vary in different places, and that the age of oceanic crust consistently increases with distance from a ridge. – The oldest part of the seafloor is geologically young at about 180 million years old. 2. The thickness of ocean-floor sediment was, in g ...
... 1. The ages of the rocks that make up the seafloor vary in different places, and that the age of oceanic crust consistently increases with distance from a ridge. – The oldest part of the seafloor is geologically young at about 180 million years old. 2. The thickness of ocean-floor sediment was, in g ...
Practice Exam #5 - El Camino College
... of energy swimming, so they do not need as much (C) ____________________________ as other ocean animals and can live in places and survive at times when less food is available. Jellies also have transparent bodies. How does this kind of body benefit them? (Make sure that you relate the benefit to th ...
... of energy swimming, so they do not need as much (C) ____________________________ as other ocean animals and can live in places and survive at times when less food is available. Jellies also have transparent bodies. How does this kind of body benefit them? (Make sure that you relate the benefit to th ...
Subduction and collision processes in the Central Andes
... plateaux (about 4 km) has been explained as an isostatic response to crustal thickening2,6. A low average P-wave velocity and low Poisson's ratio in the crust of the northern Altiplano have been reported from seismic observations, indicating tectonic shortening as the dominant mechanism of crustal t ...
... plateaux (about 4 km) has been explained as an isostatic response to crustal thickening2,6. A low average P-wave velocity and low Poisson's ratio in the crust of the northern Altiplano have been reported from seismic observations, indicating tectonic shortening as the dominant mechanism of crustal t ...
Changes in the Si/P weathering ratio and their effect on the selection
... where λ is an effective flow-path length (related to orography, river drain network, rock porosity, etc) and τ is a characteristic equilibrium time (related to solute concentration, mineral solubility, reaction rate, etc). Dw compares how long it takes a dissolution reaction to reach its thermodynam ...
... where λ is an effective flow-path length (related to orography, river drain network, rock porosity, etc) and τ is a characteristic equilibrium time (related to solute concentration, mineral solubility, reaction rate, etc). Dw compares how long it takes a dissolution reaction to reach its thermodynam ...
Anoxic event
![](https://commons.wikimedia.org/wiki/Special:FilePath/Aquatic_Dead_Zones.jpg?width=300)
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.