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  • 1
    Keywords: Oceanography. ; Water. ; Hydrology. ; Cogeneration of electric power and heat. ; Fossil fuels. ; Geology. ; Physical geography. ; Business. ; Management science. ; Ocean Sciences. ; Water. ; Fossil Fuel. ; Geology. ; Earth System Sciences. ; Business and Management.
    Description / Table of Contents: Part I. A History of gas hydrate research -- Chapter 1. Gas Hydrate Research: From the Laboratory to the Pipeline -- Chapter 2. Shallow gas hydrates near 64° N, off Mid-Norway: Concerns regarding drilling and production technologies -- Chapter 3. Finding and using the world’s gas hydrates -- Part II. Gas Hydrate Fundamentals -- Chapter 4. Seismic rock physics of gas-hydrate bearing sediments -- Chapter 5. Estimation of gas hydrates in the pore space of sediments using inversion methods -- Chapter 6. Electromagnetic applications in methane hydrate reservoirs -- Part III. Gas Hydrate Drilling for Research and Natural Resources -- Chapter 7. Hydrate Ridge - A gas hydrate system in a subduction zone setting -- Chapter 8. Northern Cascadia Margin gas hydrates – Regional geophysical surveying, IODP drilling Leg 311 and cabled observatory monitoring -- Chapter 9. Accretionary wedge tectonics and gas hydrate distribution in the Cascadia forearc -- Chapter 10. Bottom Simulating Reflections below the Blake Ridge, western North Atlantic Margin -- Chapter 11. A review of the exploration, discovery, and characterization of highly concentrated gas hydrate accumulations in coarse-grained reservoir systems along the Eastern Continental Margin of India -- Chapter 12. Ulleung Basin Gas Hydrate Drilling Expeditions, Korea: Lithologic characteristics of gas hydrate-bearing sediments -- Chapter 13. Bottom simulating reflections in the South China Sea -- Chapter 14. Gas hydrate and fluid related seismic indicators across the passive and active margins off SW Taiwan -- Chapter 15. Gas Hydrate Drilling in the Nankai Trough, Japan -- Chapter 16. Alaska North Slope Terrestrial Gas Hydrate Systems: Insights from Scientific Drilling -- Part IV -- Arctic -- Chapter 17. Gas Hydrates on Alaskan Marine Margins -- Chapter 18. Gas Hydrate related bottom-simulating reflections along the west-Svalbard margin, Fram Strait -- Chapter 19. Occurrence and distribution of bottom simulating reflections in the Barents Sea -- Chapter 20. Svyatogor Ridge - A gas hydrate system driven by crustal scale processes -- Chapter 21. Gas hydrate potential in the Kara Sea -- Part V. Greenland and Norwegian Sea -- Chapter 22. Geophysical indications of gas hydrate occurrence on the Greenland continental margins -- Chapter 23. Gas hydrates in the Norwegian Sea -- Part VI. North Atlantic. Chapter 24. U.S. Atlantic Margin Gas Hydrates -- Chapter 25. Gas Hydrates and submarine sediment mass failure: A case study from Sackville Spur, offshore Newfoundland -- Chapter 26. Bottom Simulating Reflections and Seismic Phase Reversals in the Gulf of Mexico -- Chapter 27. Insights into gas hydrate dynamics from 3D seismic data, offshore Mauritania -- Part VII. South Atlantic -- Chapter 28. Distribution and Character of Bottom Simulating Reflections in the Western Caribbean Offshore Guajira Peninsula, Colombia -- Chapter 29. Gas hydrate systems on the Brazilian continental margin -- Chapter 30. Gas hydrate on the southwest African continental margin -- Chapter 31. Shallow gas hydrates associated to pockmarks in the Northern Congo deep-sea fan, SW Africa -- Part VIII. Pacific -- Chapter 32. Gas hydrate-bearing province off eastern Sakhalin slope -- Chapter 33. Tectonic BSR Hypothesis in the Peruvian margin: A forgotten way to see marine gas hydrate systems at convergent margins -- Chapter 34. Gas hydrate and free gas along the Chilean Continental Margin -- Chapter 35. New Zealand’s Gas Hydrate Systems -- Part IX. Indic -- Chapter 36. First evidence of bottom simulation reflectors in the western Indian Ocean offshore Tanzania -- Part X. Mediterranean Sea -- Chapter 37. A Gas Hydrate System of Heterogenous Character in the Nile Deep-Sea Fan -- Part XI. Black Sea -- Chapter 38. Gas hydrate accumulations in the Black Sea -- Part XII. Lake Baikal -- Chapter 39. The position of gas hydrates in the sedimentary strata and in the geological structure of Lake Baikal -- Part XIII. Antarctic -- Chapter 40. Bottom Simulating Reflector in the western Ross Sea Antarctica -- Chapter 41. Bottom Simulating Reflectors along the Scan Basin, a deep-sea gateway between the Weddell Sea (Antarctica) and Scotia Sea -- Chapter 42. Bottom Simulating Reflections in Antarctica -- Part XIV. Where Gas Hydrate Dissociates Seafloor Microhabitats Flourish. Chapter 43. Integrating fine-scale habitat mapping and pore water analysis in cold seep research: A case study from the SW Barents Sea.
    Abstract: This world atlas presents a comprehensive overview of the gas-hydrate systems of our planet with contributions from esteemed international researchers from academia, governmental institutions and hydrocarbon industries. The book illustrates, describes and discusses gas hydrate systems, their geophysical evidence and their future prospects for climate change and continental margin geohazards from passive to active margins. This includes passive volcanic to non-volcanic margins including glaciated and non-glaciated margins from high to low latitudes. Shallow submarine gas hydrates allow a glimpse into the past from the Last Glacial Maximum (LGM) to modern environmental conditions to predict potential changes in future stability conditions while deep submarine gas hydrates remained more stable. This demonstrates their potential for rapid reactions for some gas hydrate provinces to a warming world, as well as helping to identify future prospects for environmental research. Three-dimensional and high-resolution seismic imaging technologies provide new insights into fluid flow systems in continental margins, enabling the identification of gas and gas escape routes to the seabed within gas hydrate environments, where seabed habitats may flourish. The volume contains a method section detailing the seismic imaging and logging while drilling techniques used to characterize gas hydrates and related dynamic processes in the sub seabed. This book is unique, as it goes well beyond the geophysical monograph series of natural gas hydrates and textbooks on marine geophysics. It also emphasizes the potential for gas hydrate research across a variety of disciplines. Observations of bottom simulating reflectors (BSRs) in 2D and 3D seismic reflection data combined with velocity analysis, electromagnetic investigations and gas-hydrate stability zone (GHSZ) modelling, provide the necessary insights for academic interests and hydrocarbon industries to understand the potential extent and volume of gas hydrates in a wide range of tectonic settings of continental margins. Gas hydrates control the largest and most dynamic reservoir of global carbon. Especially 4D, 3D seismic but also 2D seismic data provide compelling sub-seabed images of their dynamical behavior. Sub-seabed imaging techniques increase our understanding of the controlling mechanisms for the distribution and migration of gas before it enters the gas-hydrate stability zone. As methane hydrate stability depends mainly on pressure, temperature, gas composition and pore water chemistry, gas hydrates are usually found in ocean margin settings where water depth is more than 300 m and gas migrates upward from deeper geological formations. This highly dynamic environment may precondition the stability of continental slopes as evidenced by geohazards and gas expelled from the sea floor. This book provides new insights into variations in the character and existence of gas hydrates and BSRs in various geological environments, as well as their dynamics. The potentially dynamic behavior of this natural carbon system in a warming world, its current and future impacts on a variety of Earth environments can now be adequately evaluated by using the information provided in the world atlas. This book is relevant for students, researchers, governmental agencies and oil and gas professionals. Some familiarity with seismic data and some basic understanding of geology and tectonics are recommended.
    Type of Medium: Online Resource
    Pages: XXI, 514 p. 309 illus., 294 illus. in color. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783030811860
    DDC: 551.46
    Language: English
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  • 2
    Unknown
    Berlin ; Heidelberg : Springer
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    Publication Date: 2023-12-04
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉The lunar regolith breccia Dhofar 1769, which was found in 2012 as a single 125 g piece in the Zufar desert area of Oman, contains a relatively large, dark‐colored impact melt breccia embedded in a fine‐grained clastic matrix. The internal texture of the fragment indicates the repeated melt breccia formation on the lunar surface, their repeated brecciation, and mixing in second, third, and fourth generations of brecciated rock types. The chemical and mineralogical data reveal the incorporation of a feldspar‐rich subophitic crystalline melt within a feldspar‐rich microporphyritic crystalline melt breccia. This lithic paragenesis itself is embedded within a mafic, crystalline melt breccia. The entire breccia with the three different impact melts has been finally incorporated into the whole rock breccia. The three impact melts are mixtures of different source rocks and impact projectiles, based on the obtained minor and trace element compositions (in particular of Ni and the rare earth elements [REE]) of the impact melt lithologies. For all processes of impact melt formation, additional steps of their brecciation and re‐lithification require a minimum number of seven impact processes.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:552 ; Dhofar 1769 ; lunar regolith breccia ; impact melt formation ; brecciation ; re-lithification ; impact processes
    Language: English
    Type: doc-type:article
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  • 5
    Publication Date: 2024-01-12
    Description: The Formosa Ridge cold seep is among the first documented active seeps on the northern South China Sea passive margin slope. Although this system has been the focus of scientific studies for decades, the geological factors controlling gas release are not well understood due to a lack of constraints of the subsurface structure and seepage history. Here, we use high‐resolution 3D seismic data to image stratigraphic and structural relationships associated with fluid expulsion, which provide spatio‐temporal constraints on the gas hydrate system at depth and methane seepage at modern and paleo seafloors. Gas has accumulated beneath the base of gas hydrate stability to a critical thickness, causing hydraulic fracturing, propagation of a vertical gas conduit, and morphological features (mounds) at paleo‐seafloor horizons. These mounds record multiple distinct gas migration episodes between 300,000 and 127,000 years ago, separated by periods of dormancy. Episodic seepage still seems to occur at the present day, as evidenced by two separate fronts of ascending gas imaged within the conduit. We propose that episodic seepage is associated with enhanced seafloor sedimentation. The increasing overburden leads to an increase in effective horizontal stress that exceeds the gas pressure at the top of the gas reservoir. As a result, the conduit closes off until the gas reservoir is replenished to a new (greater) critical thickness to reopen hydraulic fractures. Our results provide intricate detail of long‐term methane flux through sub‐seabed seep systems, which is important for assessing its impact on seafloor and ocean biogeochemistry.
    Description: Plain Language Summary: Gas hydrates are ice‐like compounds that form in marine sediments. They can reduce the permeability of the sediments by clogging up the pore spaces, and influence how methane gas flows through sediments and then seeps out of the seafloor. Seepage of methane into the water column plays an important role in seafloor biology and ocean chemistry. In this study, we use 3D seismic imaging to investigate the subseafloor sediments of a ridge in the South China Sea where gas is currently seeping into the ocean. Our data show, in high detail, how gas migrates upward through the sediments due to the buoyancy of gas. Our data also reveal mound structures at certain depths beneath the seafloor. We interpret that these mounds represent distinct phases in the geological past where gas was seeping out of the seafloor. This indicates that gas seepage at this ridge has switched on and off (episodically) throughout geological time. We speculate that the episodic seepage is associated with rapid seafloor sedimentation, which changes pressure conditions beneath the seafloor. Our work improves the understanding of how gas seepage processes can change on geological timescales.
    Description: Key Points: Gas has accumulated beneath the base of gas hydrate stability, causing vertical gas conduit formation and seabed mounds. Mounds imaged within the conduit record episodic seepage between 300 and 127 kyrs ago. Quiescence may be associated with enhanced seafloor sedimentation that increases effective stress at the top of the gas reservoir.
    Description: MOST
    Description: ESAS
    Description: TEC
    Description: https://doi.pangaea.de/10.1594/PANGAEA.913192
    Keywords: ddc:553.1 ; gas hydrate ; gas conduit ; hydraulic fracturing ; episodic venting ; sedimentary processes ; offshore Taiwan
    Language: English
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  • 6
    Publication Date: 2023-06-16
    Description: The 1888 Ritter Island volcanic sector collapse triggered a regionally damaging tsunami. Historic eyewitness accounts allow the reconstruction of the arrival time, phase and height of the tsunami wave at multiple locations around the coast of New Guinea and New Britain. 3D seismic interpretations and sedimentological analyses indicate that the catastrophic collapse of Ritter Island was preceded by a phase of deep-seated gradual spreading within the volcanic edifice and accompanied by a submarine explosive eruption, as the volcanic conduit was cut beneath sea level. However, the potential impact of the deep-seated deformation and the explosive eruption on tsunami genesis is unclear. For the first time, it is possible to parameterise the different components of the Ritter Island collapse with 3D seismic data, and thereby test their relative contributions to the tsunami. The modelled tsunami arrival times and heights are in good agreement with the historic eyewitness accounts. Our simulations reveal that the tsunami was primarily controlled by the displacement of the water column by the collapsing cone at the subaerial-submarine boundary and that the submerged fraction of the slide mass and its mobility had only a minor effect on tsunami genesis. This indicates that the total slide volume, when incorporating the deep-seated deforming mass, is not directly scalable for the resulting tsunami height. Furthermore, the simulations show that the tsunamigenic impact of the explosive eruption energy during the Ritter Island collapse was only minor. However, this relationship may be different for other volcanogenic tsunami events with smaller slide volumes or larger magnitude eruptions, and should not be neglected in tsunami simulations and hazard assessment.
    Description: Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347
    Keywords: Tsunami simulations ; Volcanogenic tsunami genesis ; Ritter Island ; Volcanic sector collapse
    Language: English
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  • 7
    Publication Date: 2023-07-06
    Description: This study presents culture experiments of the cold water species Neogloboquadrina pachyderma (sinistral) and provides new insights into the incorporation of elements in foraminiferal calcite of common and newly established proxies for paleoenvironmental applications (shell Mg/Ca, Sr/Ca and Na/Ca). Specimens were collected from sea ice during the austral winter in the Antarctic Weddell Sea and subsequently cultured at different salinities and a constant temperature. Incorporation of the fluorescent dye calcein showed new chamber formation in the culture at salinities of 30, 31, and 69. Cultured foraminifers at salinities of 46 to 83 only revealed chamber wall thickening, indicated by the fluorescence of the whole shell. Signs of reproduction and the associated gametogenic calcite were not observed in any of the culture experiments. Trace element analyses were performed using an electron microprobe, which revealed increased shell Mg/Ca, Sr/Ca, and Na/Ca values at higher salinities, with Mg/Ca showing the lowest sensitivity to salinity changes. This study enhances the knowledge about unusually high element concentrations in foraminifera shells from high latitudes. Neogloboquadrina pachyderma appears to be able to calcify in the Antarctic sea ice within brine channels, which have low temperatures and exceptionally high salinities due to ongoing sea ice formation.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel http://dx.doi.org/10.13039/501100003153
    Keywords: ddc:561 ; foraminifera ; chamber calcification ; salinity effects ; experiments ; paleooceanographic reconstructions
    Language: English
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  • 8
    Publication Date: 2023-11-17
    Description: Submarine landslides can destroy seafloor infrastructures and generate devastating tsunamis. In spite of decades of research into the functioning of submarine landslides there are still numerous open questions, in particular how different phases of sliding influence each other. Here, we re‐analyze Ana Slide—a relatively small (〈1 km3) landslide offshore the Balearic Islands, which is unique in the published literature because it is completely imaged by high‐resolution 3D reflection seismic data. Ana Slide comprises three domains: (a) a source area that is almost completely evacuated with evidence of headscarp retrogression, (b) an adjacent downslope translational domain representing a by‐pass zone for the material that was mobilized in the source area, and (c) the deposit formed by the mobilized material, which accumulated downslope in a sink area and deformed slope sediment. Isochron maps show deep chaotic seismic units underneath the thickest deposits. We infer that the rapid deposition of the landslide material deformed the underlying sediments. A thin stratified sediment unit between three lobes suggests that Ana Slide evolved in two failure stages separated by several tens of thousands of years. This illustrates the problem of over‐estimating the volume of mobilized material and under‐estimating the complexity even of relatively simple slope failures without high‐quality 3D reflection seismic data.
    Description: Plain Language Summary: We investigate a submarine landslide in the Balearic Islands off Spain. The aim is to find out how such landslides work. This study is special because it can draw on a unique data set: the complete imaging of this landslide with high quality reflection seismic data. We find that previous studies have over‐estimated the volume of the mobilized material because deformed sediments below the landslide were also counted, and that the slide actually consisted of two individual slope failures that occurred at the same place but in distinct episodes separated by some tends of thousands of years. Together these results show that there is a large risk of overestimating landslide‐related tsunami hazards when this kind of reflection seismic data is not available.
    Description: Key Points: Ana Slide is completely covered by 3D reflection seismic data and its kinematic development is addressed. Large parts of the volume previously interpreted as landslide material was deformed in‐situ. Ana Slide developed during two separate phases that involved likely significantly smaller volumes of material than previously proposed.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: GRC Geociències Marines
    Description: https://doi.pangaea.de/10.1594/PANGAEA.943506
    Description: https://doi.pangaea.de/10.1594/PANGAEA.943523
    Keywords: ddc:622.1592 ; submarine landslide ; kinematic analysis ; substrate deformation processes ; Mediterranean Sea ; emplacement mechanism
    Language: English
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    Publication Date: 2021-07-26
    Description: A large, igneous-textured, and 2 cm-sized spherical object from the L5/6 chondrite NWA 8192 was investigated for its chemical composition, petrography, O isotopic composition, and Hf-W chronology. The petrography and chemical data indicate that this object closely resembles commonly found chondrules in ordinary chondrites and is therefore classified as a “macrochondrule.* As a result of metal loss during its formation, the macrochondrule exhibits elevated Hf/W, which makes it possible to date this object using the short-lived 182Hf-182W system. The Hf-W data provide a two-stage model age for metal–silicate fractionation of 1.4 ± 0.6 Ma after Ca-Al-rich inclusion (CAI) formation, indicating that the macrochondrule formed coevally to normal-sized chondrules from ordinary chondrites. By contrast, Hf-W data for metal from the host chondrite yield a younger model age of ~11 Ma after CAIs. This younger age agrees with Hf-W ages of other type 5–6 ordinary chondrites, and corresponds to the time of cooling below the Hf-W closure temperature during thermal metamorphism on the parent body. The Hf-W model age difference between the macrochondrule and the host metal demonstrates that the Hf-W systematics of the bulk macrochondrule were not disturbed during thermal metamorphism, and therefore, that the formation age of such objects can still be determined even in strongly metamorphosed samples. Collectively, this study illustrates that chondrule formation was not limited to mm-size objects, implying that the rarity of macrochondrules reflects either that this process was very inefficient, that subsequent nebular size-sorting decimated large chondrules, or that large precursors were rare.
    Keywords: 549.112
    Language: English
    Type: article
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  • 10
    Publication Date: 2022-04-04
    Description: Focused fluid flow shapes the evolution of marine sedimentary basins by transferring fluids and pressure across geological formations. Vertical fluid conduits may form where localized overpressure breaches a cap rock (permeability barrier) and thereby transports overpressured fluids towards shallower reservoirs or the surface. Field outcrops of an Eocene fluid flow system at Pobiti Kamani and Beloslav Quarry (ca 15 km west of Varna, Bulgaria) reveal large carbonate‐cemented conduits, which formed in highly permeable, unconsolidated, marine sands of the northern Tethys Margin. An uncrewed aerial vehicle with an RGB sensor camera produces ortho‐rectified image mosaics, digital elevation models and point clouds of the two kilometre‐scale outcrop areas. Based on these data, geological field observations and petrological analysis of rock/core samples, fractures and vertical fluid conduits were mapped and analyzed with centimetre accuracy. The results show that both outcrops comprise several hundred carbonate‐cemented fluid conduits (pipes), oriented perpendicular to bedding, and at least seven bedding‐parallel calcite cemented interbeds which differ from the hosting sand formation only by their increased amount of cementation. The observations show that carbonate precipitation likely initiated around areas of focused fluid flow, where methane entered the formation from the underlying fractured subsurface. These first carbonates formed the outer walls of the pipes and continued to grow inward, leading to self‐sustaining and self‐reinforcing focused fluid flow. The results, supported by literature‐based carbon and oxygen isotope analyses of the carbonates, indicate that ambient seawater and advected fresh/brackish water were involved in the carbonate precipitation by microbial methane oxidation. Similar structures may also form in modern settings where focused fluid flow advects fluids into overlying sand‐dominated formations, which has wide implications for the understanding of how focusing of fluids works in sedimentary basins with broad consequences for the migration of water, oil and gas.
    Description: Integrated School of Ocean Sciences (ISOS) Kiel
    Description: European Union’s Horizon 2020 http://dx.doi.org/10.13039/100010661
    Description: Bulgarian Science Fund
    Keywords: ddc:551
    Language: English
    Type: doc-type:article
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