Showing papers in "Marine Geology in 2005"

TL;DR: In this paper, the authors reconcile records of warm high latitudes with glacio-eustasy by proposing that Late Cretaceous-early Eocene ice sheets generally reached maximum volumes of 8 −12 −10 6 km 3 (20 −30 m glacioeustatic equivalent), but did not reach the Antarctic coast; hence, coastal Antarctica remained relatively warm even though there were significant changes in sea level as the result of glaciation.

TL;DR: In this paper, the authors used a shallow-water model to simulate the slide-generated tsunami from a large submarine slope failure, which was transformed into a turbidity current carrying mud and sand eastward up to 1000 km at estimated speeds of about 60-100 km/h, breaking 12 telegraph cables.

TL;DR: In this article, the authors employ a model of atmosphere-ocean-sediment carbon cycling to explore the impact of these factors on the saturation state and carbonate chemistry of the global ocean during the Phanerozoic.

TL;DR: In this article, seismic reflection profiles in the western part of the Gulf of Lions were used to confirm the basinward extension of the Messinian erosion and enable the mapping of distinctive seismic markers indicating Messinian Erosional Surface (or Messinian unconformity), the basin margin detrital deposits, and the deep evaporite sequence.

TL;DR: The concept of beach morphodynamic states has achieved widespread acceptance in the coastal geological literature since its inception in the mid-1980s and expansion in the 1990s as mentioned in this paper, and a close empirical relationship between beach 3-dimensional morphology and the Dean's parameter (H-b/WsT) was established.

TL;DR: A new type of pockmark has been discovered off mid-Norway in 2003 and 2004 using ROVs, which contain up to 10 m high ridges of methane-derived authigenic carbonate (MDAC) rock as discussed by the authors.

TL;DR: In this article, the authors examined the dependence of acoustic backscatter on sediment grain size distribution using dual frequency (100 and 410 kHz) sidescan sonar and 22 sediment grab samples from the Loch Linnhe artificial reef site on the west coast of Scotland.

TL;DR: In this paper, a compilation of evolutionary trajectories of major eucaryotic phytoplankton for the past 205 million years is presented, showing that changes in phyto-ankton community structure, coupled with the opening of the Atlantic Ocean basin and global sea-level rise, increased the efficiency of organic carbon burial beginning in the Early Jurassic; in turn, this carbon burial increased the oxidation state of Earth's surface while drawing down atmospheric CO2 levels (assuming no substantial negative feedbacks).

TL;DR: Gravity cores from the continental slope in the northwestern Black Sea were studied using high-resolution stable isotope, grain size and XRF-scanning data in this article, providing a 30,000 years AMS 14C-dated record of variations in the hydrological regime of the Black Sea and give insight into changing paleoenvironments in the surrounding areas.

TL;DR: In this paper, the modern Po Delta system, comprising five main delta lobes, has been investigated by integrating VHR seismic surveys, recorded offshore from water depths as shallow as 5 m to the toe of the prodelta in about 30 m, with accurate historical cartography extending back several centuries.

TL;DR: In this article, the late Pleistocene and Holocene environmental evolution and sequence stratigraphic architecture of the Po Delta region, Northern Italy, are examined, and a discussion on different auto and allocyclic mechanisms controlling the depositional evolution and a quantitative estimation of the changing depositional rates are also provided.

TL;DR: In this article, the Western Anatolia Miocene-to-Present Day magmatism evolved from calc-alkaline and shoshonitic rocks (21−16 Ma) to lamproites (16−14 Ma), and eventually into OIB-type magmas (2−0 Ma) represented by the Kula volcanics.

TL;DR: Rip current kinematics and beach morphodynamics were measured for 44 days at Sand City, Monterey Bay, CA using 15 instruments composed of co-located velocity and pressure sensors, acoustic Doppler current profilers, and kinematic GPS surveys as mentioned in this paper.

TL;DR: In this article, a global analysis of world deltas, with details from a natural and an anthropogenic-influenced delta, demonstrates how distributary channels control the flux of sediment into the coastal ocean.

TL;DR: In this paper, a radiocarbon chronology for the accumulation of the sedimentary bodies and an interpretation of the morphology of the mouth lobes that they form are presented, and the role of the accommodation space is confirmed by two recent drillholes traversing the entire Holocene succession.

TL;DR: The El Arraiche field is a new mud volcano field discovered near the Moroccan shelf edge in the Gulf of Cadiz that consists of 8 mud volcanoes in water depths from 200 to 700 m as discussed by the authors.

TL;DR: In this paper, a sediment core taken from a tidal mudflat in Ho Bugt in the northernmost part of the Wadden Sea in Denmark is used to explore the application of optically stimulated luminescence (OSL) dating to young fine-grained estuarine sediments, using 210Pb dating and the 137Cs Sellafield peak from 1980 as independent age control.

TL;DR: In this article, a quantitative estimate of the sediment accumulating on the muddy belt extending along the western Adriatic continental shelf, a budget was calculated based on the mass accumulation rates measured from more than one hundred activity-depth profiles of 210 Pb.

TL;DR: In this paper, the results of integrated biomarker and 16S rRNA gene study reveal a crucial role of AOM processes in formation of authigenic carbonates in methane seep environments.

TL;DR: The Atchafalaya River in Louisiana shares the third largest drainage basin in the world with the Mississippi River and sediment cores and seismic profiles were used to examine the development and impact on land accretion of an early-stage subaqueous delta accumulating on the shallow ( 3 cm/year) correspond to the foreset and bottomset region, with rates decreasing to as low as 0.9 cm/ year on the shelf topset region and its extension inside Atchafealaya Bay as discussed by the authors.

TL;DR: In this paper, high frequency field measurements of water depth, flow velocity and suspended sediment concentration were made at three fixed locations across the high tide swash and inner surf zones of a dissipative beach.

TL;DR: In this paper, a new morphologicalbehaviour model is used to simulate evolution of coastal morphology associated with cross-shore translations of the shoreface, barrier, and estuary.

TL;DR: In this article, the Holocene depositional history of southeastern Po Plain on time scales of 103 yr is reconstructed, based upon integrated sedimentological and micropalaeontological analyses of nine continuously-cored boreholes, about 40 m deep.

TL;DR: In this article, a major submarine landslide with a volume >20 km 3 and an area >430 km 2 has been imaged in the subsurface off Angola, using 3D seismic data.

TL;DR: In this article, a total of 83 cores were collected in the Gulf of Lions continental margins and analyzed for 210 Pb xs (excess 210 pb) in order to understand sedimentation patterns.

TL;DR: In this paper, the authors used the maximum penetration depth of the short-lived radioisotope 7Be (half-life 53.3 d) to estimate the flood sediment thickness.

TL;DR: In this article, the authors studied the effect of high river discharge on suspended matter and dissolved nutrients in the prodelta of the Po River (northern Adriatic Sea) immediately after one of the greatest floods of the last century.

TL;DR: In this article, a detailed interpretation of multi-channel seismic reflection profiles showed that the deposition of the Miocene successions in the Cilicia-Adana basin complex occurred within a fore-deep, south of the arcuate Tauride fold-thrust belt.

TL;DR: In this paper, the authors used AMS radiocarbon dating and cyclic changes in the number of planktonic foraminifera and lithological parameters suggest that the laminations in the core are annual varves.

TL;DR: In this paper, the authors derived from multibeam echo-sounder data of submarine canyons in the Atlantic USA continental slope and found that the rate of erosion along-channel gradient and hemipelagic contributing area A (derived from topography in the same way as for river catchments) were also found to show declining S with A. The general decline in S with increasing A can be explained by channel erosion by sedimentary mass flows, such as turbidity currents.