Search results for " geochemical proxies"

showing 3 items of 3 documents

High-resolution geochemical and biotic records of the Tethyan 'Bonarelli Level' (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite sec…

2004

Abstract High-resolution micropalaeontological and chemostratigraphic records for the upper Cenomanian portion of the Calabianca–Guidaloca composite section (NW Sicily) provide new insight into the palaeoclimatic and palaeoceanographic evolution of the Tethys Ocean. The Bonarelli Level equivalent was identified on the basis of lithology and well constrained by calcareous plankton biostratigraphy and radiolarian assemblages, as well as by the δ 13 C curve showing a marked positive excursion (up to 4.7‰). The Bonarelli Level equivalent deposition is characterized by highly eutrophic conditions as testified by radiolarian proliferation. Black shale samples from the Calabianca–Guidaloca composi…

010506 paleontologyLithologyBiostratigraphy010502 geochemistry & geophysicsOceanography01 natural sciencesMicrofossilsCretaceousForaminiferaPaleontologyPalaeoceanography14. Life underwaterSicilyEcology Evolution Behavior and Systematics0105 earth and related environmental sciencesEarth-Surface ProcessesbiologyPaleontologyCretaceous Sicily Corg-rich deposits Bonarelli level equivalent Microfossils Geochemical proxies Palaeoceanography15. Life on landbiology.organism_classificationTethys OceanAnoxic watersCretaceous13. Climate actionBenthic zone[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/StratigraphyBonarelli level equivalentCenomanianGeology
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Comparative high-resolution chemostratigraphy of the Bonarelli Level from the reference Bottaccione section (Umbria-Marche Apennines) and from an equ…

2006

The Bonarelli Level (BL) from the upper Cenomanian portion of the reference Bottaccione section (central Italy) is characterized by the presence of black shales containing high TOC concentrations (up to 17%) and amounts of CaCO3 near to zero. In the absence of carbonate and, consequently, of relative carbon- and oxygen-isotopic data, the elemental geochemistry revealed to be a very useful tool to obtain information about the palaeoclimatic and palaeoceanographic evolution of the Tethys Ocean during the OAE2. Based on several geochemical proxies (Rb, V, Ni, Cr, Si, Ba), the BL is interpreted as a high-productivity event driven by increasingly warm and humid climatic conditions promoting an a…

chemistry.chemical_classification010506 paleontologyCretaceous Umbria–Marche Apennines Sicily Corg-rich deposits Bonarelli Level Geochemical proxies PalaeoceanographyGeology15. Life on land010502 geochemistry & geophysicsTethys Ocean01 natural sciencesCretaceousSeafloor spreadingDeposition (geology)chemistry.chemical_compoundPaleontologychemistry13. Climate actionGeochemistry and PetrologyChemostratigraphy[SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/StratigraphyCarbonateOrganic matterCenomanianGeology0105 earth and related environmental sciences
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Contaminated sediments from dredging activities as modern turbidites: geochemical signatures in box-core sediments from the Augusta area, Ionian Sea,…

2009

The Augusta area (SE Sicily) is one of the most industrialized and contaminated coastal environments in the Mediterranean region, having a relatively high influx of unregulated industrial effluents. Valuable sets of geochemical data (major elements and trace metals), obtained from box-core sediments collected along a transect from the Sicilian coastal zone seawards of Augusta and dated via 210Pb and 137Cs, indicated increased metal contamination (notably Hg) since ca 1940-1950, related to the industrial development of the area. Metal enrichment is considerable in the coastal sediments, being significantly in excess (for Hg and Pb) of background values estimated for the Strait of Sicily. Mor…

marine sediment geochemical proxies dredging activities Augusta offshoreSettore GEO/08 - Geochimica E Vulcanologia
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