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Showing 1 to 20 of 41 for “"benthic foraminifera"”.
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Investigation into the post-mortem transport of benthic foraminifera
Palaeoenvironmental reconstruction using foraminifera relies on the assumption that assemblages reflect the ecological conditions at the time of deposition. However, the distribution of taxa can be greatly affected by transport and reworking of tests. This is particularly important in high energy …
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Zinc and cadmium in benthic foraminifera as tracers of ocean paleochemistry
Benthic foraminiferal δ13C, Cd/Ca, and Ba/Ca are important tools for reconstructing nutrient distributions, and thus ocean circulation, on glacial-interglacial timescales. However, each tracer has its own "artifacts" that can complicate paleoceanographic interpretations. It is therefore …
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Benthic foraminifera from the Orange-Luderitz shelf, southern African continental margin
An investigation of the benthic foraminifera in the surficial sediments of the continental shelf and upper slope off the Orange River mouth and the Namib Desert was undertaken as an adjunct to sedimentological and geophysical investigations being conducted by members of the Joint Geological …
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Zinc and cadmium in benthic foraminifera as tracers of ocean paleochemistry
Benthic foraminiferal δ13C, Cd/Ca, and Ba/Ca are important tools for reconstructing nutrient distributions, and thus ocean circulation, on glacial-interglacial timescales. However, each tracer has its own "artifacts" that can complicate paleoceanographic interpretations. It is therefore …
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Community and trophic responses of benthic Foraminifera to oxygen gradients and organic enrichment
… World Ocean. This will favour organisms, such as Foraminifera (testate protists), that tolerate low-oxygen conditions and may lead to an overall decline in marine biodiversity. With this in mind, community and trophic responses of benthic Foraminifera were investigated at two contrasting sites in …
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RESPONSES OF RECENT BENTHIC FORAMINIFERA TO METAL POLLUTION IN SOUTH WEST ENGLAND ESTUARIES: A STUDY OF IMPACT AND CHANGE
… post-impact study using the responses of Recent benthic foraminifera as indicators of metal pollution was carried out on this Creek which had not been investigated previously. Because of a lack of pre-discharge foraminiferal data from Restronguet Creek, other estuaries, which previously drained …
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Assemblage Comparisons of Living Benthic Foraminifera at Bathyal Sites Oiled and Un-Oiled by the Deepwater Horizon Blowout in the Northeastern Gulf of Mexico
<p>Live benthic foraminiferal assemblages were studied at contaminated and uncontaminated bathyal sites around the wellhead of the Deepwater Horizon oil spill. Samples collected in October of 2010 and 2011 and summer of 2012 were divided into uncontaminated (GIP 12, 21, K, and 25 and Obs0), …
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The contemporary distribution of benthic foraminifera in the Pearl River estuary, southeast China, and their use in reconstructing mid‐ to late‐Holocene fluvial flux
… investigates the contemporary distribution of benthic foraminifera in the Pearl River estuary, southeast China, and establishes a new proxy record of estuarine salinity and fluvial flux over the mid‐ to late‐Holocene. Seventy‐six samples from the contemporary estuary yielded 118 benthic taxa. …
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Sulfate in foraminiferal calcium carbonate : investigating a potential proxy for sea water carbonate ion concentration
The sulfur content of planktonic and benthic foraminifera was measured in specimens recovered from deep-sea sediment cores and individuals grown in culture. A new method for measuring sulfur in foraminiferal calcium carbonate was developed, employing a high-resolution inductively coupled …
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Chemical Weathering History of Antarctica During A Late Eocene Glacial Event
… I compile evidence from fine fraction carbonate, benthic foraminifera, fossil fish teeth, detrital sediment, and sea level records to build a case for the existence of a brief cooling event accompanied by the growth of an ephemeral ice sheet 37.15 Ma, three million years prior to the onset of …
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Modern Foraminiferal Assemblages of the Denmark Strait
<p>Foraminifera occupy a geological range from the early Cambrian to the present day. Their well preserved shells, high relative abundance, and short response time to changing environmental conditions make foraminifera ideal proxies for environmental change. Benthic foraminifera are a valuable but …
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Benthic foraminiferal change and depositional history across the Cretaceous – Paleogene (K/Pg) boundary in the Brazos River area, Texas
… a pre-extinction impact or multiple impacts. The benthic foraminiferal data generated indicates significant changes in palaeoecology of the benthic foraminifera across the K/Pg boundary. The benthic foraminifera do not experience a mass extinction, unlike the planktic foraminifera, which were …
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Paleoceanographic variability on a millennial scale: a high resolution record of the latest deglaciation from the Blake Outer Ridge, western North Atlantic
… and 10,600 14C years BP, the coincidence of benthic foraminifera abundance maxima and benthic δ13C minima from C. wuellerstorfi indicate an increased influence of AABW relative to NADW in the vicinity of 3000 meters on the Blake Outer Ridge.
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FORAMINIFERAL COMMUNITY DYNAMICS OF THE CHESAPEAKE GROUP, CALVERT CLIFFS, MARYLAND, USA
… and widely distributed organisms such as benthic foraminifera. The Calvert and Choptank formations of the Calvert Cliffs, MD were deposited during the Middle Miocene Climatic Optimum (MMCO) when global temperatures were ~3-6[degrees]C higher than present and the subsequent Middle Miocene …
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Abrupt climate change in the Atlantic Ocean during the last 20,000 years : insights from multi-element analysis of benthic and planktic foraminifera and coupled OA-GCM
Minor and trace element records of planktic and benthic foraminifera from Atlantic sediment cores, as well as output from a coupled OAGCM, were used to investigate the magnitude and distribution of the oceanic response to abrupt climate events of the past 20 kyr. The study addressed three major …
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POPULATION DYNAMICS AND GEOCHEMISTRY OF BENTHIC AND PLANKTONIC FORAMINIFERA TO INTERPRET THE PALEOCEANOGRAPHIC CHANGES ACROSS THE CENOMANIAN-TURONIAN OCEANIC ANOXIC EVENT 2 AT LOW AND HIGH LATITUDES
This PhD research project has investigated benthic and planktonic foraminiferal dynamics across one of the greatest environmental perturbations that occurred throughout the Earth’s history, namely the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE 2). It is globally marked by a positive δ13C …
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Late Quaternary ice-ocean interactions in central West Greenland
… past periods of climate change. This thesis uses benthic foraminifera as a proxy to reconstruct past changes in the temperature of the relatively warm West Greenland Current, to investigate the possible influence of ocean warming on ice sheet dynamics during the initial marine-based deglaciation …
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Sedimentology and Biostratigraphy of the Chorgali Formation, Potwar and Hazara Sub-Basins, Upper Indus Basin of Pakistan: Implications for the Closing Stage of the Eastern Neo-Tethys Ocean
… Assilina-Nummulites Floatstone (LF5), Mixed Benthic-Planktonic Foraminifera Wackestone (LF6), Benthic Foraminifera Rudstone (LF7), Shale Lithofacies (LF8), and Planktonic Mudstone (LF9). The sedimentary features and fossil associations of the formation suggest that deposition of the formation …
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