Negative carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial deposits in Namibia, combined with estimates of thermal subsidence history, suggest that biological productivity in the surface ocean collapsed for millions of…
Sedimentology
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17,131 papers
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The marine fill of ancient foreland basins is primarily recorded by depositional systems consisting of facies and facies associations deposited by a variety of sediment gravity flows in shallow-marine, slope and basinal settings.
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A manual is presented to assist in assessing the suitability of individual calcareous rhythmites for high-resolution stratigraphic applications and orbital dating. While the astrochronological approach offers an unprecedented high temporal…
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Sequence stratigraphy emphasizes facies relationships and stratal architecture within a chronological framework. Despite its wide use, sequence stratigraphy has yet to be included in any stratigraphic code or guide. This lack of standardization…
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Hyperpycnal flows form in the marine environment when river discharge enters the ocean with suspended concentrations in excess of 36 kg m(-3) due to buoyancy considerations, or as little as 1-5 kg m when convective instability is considered. They…
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Sediment sorting at the lee side of ripples, dunes and bars has already been recognized long ago. A predictive model of the sorting is necessary but unavailable for implementation in sediment transport models for sediment mixtures. Relevant…
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Rainfall scavenges meteoric cosmogenic (10)Be from the atmosphere. (10)Be falls to the Earth's surface, where it binds tightly to sediment particles in non-acidic soils over the life-span of those soils. As such, meteoric (10)Be has the potential to…
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Abstract A general classification of subglacially-deformed materials is proposed, based on sediment properties and their relationship to styles of subglacial strain. Deformation till is defined as homogenized, usually diamictic material formed by…
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Morphological interpretation of regional and detailed bathymetric data sets on the 2500-km-long Norwegian shelf from the North Sea (57N) to Svalbard (80N) has revealed a dynamic ice-flow pattern along the western margin of the Scandinavian and…
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Seabed faulting can have a significant impact on the routeing and behaviour of gravity currents depositing sand on deepwater basin floors. The Neogene El Cautivo Fault in the Tabernas-Sorbas Basin, SE Spain, is a rare example of a fault that…
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The size and distribution of Antarctic subglacial lakes have been investigated using airborne radio-echo sounding (RES) and satellite radar altimetry. Over 70 lakes have been identified beneath the ice sheet from distinctive, mirror-like reflectors…
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Ice streams are corridors of fast ice flow (ca. 0.8 km/year) within an ice sheet and are responsible for discharging the majority of the ice and sediment within them. Consequently, like the arteries in our body, their behaviour and stability is…
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The increase in sea level from the last glacial maximum has been derived from a siliciclastic system on the tectonically stable Sunda Shelf in Southeast Asia. The time from 21 to 14 thousand calendar years before the present has been poorly covered…
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Existing sequence-stratigraphic models for shoreline deposits commonly assume a constant process regime throughout the relative-sea-level (RSL) cycle over a wide range of timescales (third-order cycles as well as high-frequency, fourth- and…
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Hotspots include midplate features like Hawaii and on-axis features like Iceland. Mantle plumes are a well-posed hypothesis for their formation. Starting plume heads provide an explanation of brief episodes of flood basalts, mafic intrusions, and…
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Tidal sand ridges are common features on modern shelves but only few examples of such preserved sand bodies are described in Pleistocene deposits. In the stratigraphic record, some sand bodies encased in shales, previously interpreted as sand…
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It has recently been found that Neoproterozoic glaciogenic sediments were deposited mainly at low paleolatitudes, in marked qualitative contrast to their Pleistocene counterparts. Several competing models vie for explanation of this unusual…
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3-D seismic facies modeling of late Foxe/Wisconsin glacial deposits in the Savage Basin provides important new data concerning the morphology and origin of acoustically unstratified seismic units on high-latitude continental shelves. Savage basin…
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Researcher (at a non-Academic Institution)Geological Survey of Canada -
Researcher (at an Academic Institution)IRSPS, Università d'Annunzio -
Ph.D. StudentLisbon, Portugal -
Ph.D. StudentCouncil for Geoscience -
Ph.D. StudentLisbon, Portugal