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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Indian Peninsula
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India (1)
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Channeled Scabland (1)
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Europe
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Southern Europe
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Italy
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Apulia Italy (1)
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Western Europe
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France
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Alpes-Maritimes France
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Nice France (1)
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Indian Ocean (2)
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Kerguelen Plateau (1)
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Pacific Ocean
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East Pacific
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East Pacific Rise (1)
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Northeast Pacific (1)
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Equatorial Pacific (1)
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North Pacific
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Mid-Pacific Mountains
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Resolution Seamount (1)
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Northeast Pacific (1)
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Northwest Pacific (1)
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West Pacific
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Northwest Pacific (1)
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Ontong Java Plateau (1)
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Resolution Seamount (1)
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United States
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Washington (1)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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isotope ratios (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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fossils
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Invertebrata
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Protista
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Foraminifera (1)
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microfossils (1)
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geochronology methods
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Ar/Ar (1)
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geologic age
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Mesozoic
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Cretaceous
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Lower Cretaceous (1)
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Middle Cretaceous (1)
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minerals
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hydrates (1)
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Primary terms
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absolute age (1)
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Asia
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Indian Peninsula
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India (1)
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carbon
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C-13/C-12 (1)
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climate change (1)
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continental slope (1)
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data processing (3)
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Deep Sea Drilling Project
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IPOD
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Leg 62
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DSDP Site 463 (1)
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Leg 17
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DSDP Site 167 (1)
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Europe
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Southern Europe
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Italy
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Apulia Italy (1)
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Western Europe
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France
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Alpes-Maritimes France
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Nice France (1)
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faults (1)
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fractures (1)
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geomorphology (1)
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geophysical methods (6)
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Indian Ocean (2)
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Invertebrata
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Protista
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Foraminifera (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous (1)
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Middle Cretaceous (1)
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Ocean Drilling Program
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Leg 143
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ODP Site 866 (1)
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ocean floors (3)
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Pacific Ocean
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East Pacific
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East Pacific Rise (1)
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Northeast Pacific (1)
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Equatorial Pacific (1)
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North Pacific
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Mid-Pacific Mountains
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Resolution Seamount (1)
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Northeast Pacific (1)
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Northwest Pacific (1)
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West Pacific
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Northwest Pacific (1)
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Ontong Java Plateau (1)
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Resolution Seamount (1)
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paleoecology (1)
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plate tectonics (2)
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sea-floor spreading (1)
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sedimentary rocks (1)
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United States
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Washington (1)
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well-logging (2)
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sedimentary rocks
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sedimentary rocks (1)
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Assessing uncertainties in high-resolution, multifrequency receiver-function inversion: A comparison with borehole data
The mid-Cretaceous was marked by emplacement of large igneous provinces (LIPs) that formed gigantic oceanic plateaus, affecting ecosystems on a global scale, with biota forced to face excess CO 2 resulting in climate and ocean perturbations. Volcanic phases of the Ontong Java Plateau (OJP) and the southern Kerguelen Plateau (SKP) are radiometrically dated and correlate with paleoenvironmental changes, suggesting causal links between LIPs and ecosystem responses. Aptian biocalcification crises and recoveries are broadly coeval with C, Pb, and Os isotopic anomalies, trace metal influxes, global anoxia, and climate changes. Early Aptian greenhouse or super-greenhouse conditions were followed by prolonged cooling during the late Aptian, when OJP and SKP developed, respectively. Massive volcanism occurring at equatorial versus high paleolatitudes and submarine versus subaerial settings triggered very different climate responses but similar disruptions in the marine carbonate system. Excess CO 2 arguably induced episodic ocean acidification that was detrimental to marine calcifiers, regardless of hot or cool conditions. Global anoxia was reached only under extreme warming, whereas cold conditions kept the oceans well oxygenated even at times of intensified fertility. The environmental disruptions attributed to the OJP did not trigger a mass extinction: rock-forming nannoconids and benthic communities underwent a significant decline during Oceanic Anoxic Event (OAE) 1a, but recovered when paroxysmal volcanism finished. Extinction of many planktonic foraminiferal and nannoplankton taxa, including most nannoconids, and most aragonitic rudists in latest Aptian time was likely triggered by severe ocean acidification. Upgraded dating of paleoceanographic events, improved radiometric ages of the OJP and SKP, and time-scale revision are needed to substantiate the links between magmatism and paleoenvironmental perturbations.
Electrical anisotropy due to gas hydrate-filled fractures
Two ways to quantify uncertainty in geophysical inverse problems
Expanded uncertainty quantification in inverse problems: Hierarchical Bayes and empirical Bayes
A dual-grid nonlinear inversion technique with applications to the interpretation of dc resistivity data
Wilkes transform system and "nannoplate"
Transition between a valley and a high at the axis of mid-ocean ridges
Sonar images of the path of recent failure events on the continental margin off Nice, France
When examined in plan view with side-looking sonar, the path of recent sub-sea failure events on the continental margin off Nice displays morphologic features indicative of the passage of sediment flows that interacted with the sea-bed substrate. The path begins as chutes incised on a steep prodelta slope. These chutes feed into the floor of a submarine canyon, which is covered with trains of bedforms oriented at right angles to the flow direction. The bedforms have wavelengths between 35 and 100 m and heights estimated at less than 5 m. The waves are made of coarse material ranging from sand to boulders. Giant bedforms of similar character and scale in the Channeled Scabland (eastern Washington) were produced by a sudden catastrophic flood. Near the base of the slope, where the canyon floor widens and the thalweg gradient decreases, the path becomes a scoured surface with depressions up to 70 m deep produced by the erosion of bedded sediments. As the bottom slope decreases, the width of the area scoured and the cross section of the flows increase. Along the 80 km of the path that was imaged, which was entirely upslope from the location where submarine cables were disrupted by a failure event in 1979, there is little sign of deposition, but extensive evidence of substrate reworking. Our plan-view study of a present-day surface and its bedforms offers an instantaneous picture of an unconformity in development that contrasts with the classical study of similar unconformities in cross section where the emphasis is placed on the time dimension.