scholarly journals Radiocarbon Ages of Shells in Holocene Marine Deposits

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 556-561 ◽  
Author(s):  
Joakim Donner ◽  
Högne Jungner
Keyword(s):  
Sea Level ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
Radiocarbon Dates ◽  
West Greenland ◽  
Additional Information ◽  
Marine Deposits ◽  
Fossil Assemblages ◽  
North Norway

Radiocarbon dates of marine shells from Central West Greenland, Finnmark, in North Norway, and Dublin Bay, in Ireland, were used in dating relative sea-level changes. When fossil assemblages and formation of marine deposits and their relationship to sea-level were taken into account, the constructed curves of relative sea-level changes agreed with the shell dates. The origin of the shells in the deposits studied varied from site to site, but the dates gave additional information of the formation of marine deposits which could not have been obtained from the study of sediments alone.

scholarly journals Relative sea-level changes in crete: reassessment of radiocarbon dates from Sphakia and west Crete

2002 ◽  
Vol 97 ◽  
pp. 171-200 ◽  
Author(s):  
Simon Price ◽  
Tom Higham ◽  
Lucia Nixon ◽  
Jennifer Moody
Keyword(s):  
Sea Level ◽  
Late Antiquity ◽  
Isotopic Fractionation ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
Radiocarbon Dates ◽  
Sea Levels ◽  
Catastrophic Earthquake ◽  
Radiocarbon Data ◽  
Calendar Dates

This article is concerned with the recognition and dating of Holocene relative sea-level changes along the coast of west Crete (an island located in the active Hellenic subduction arc of the southern Aegean) and in particular in Sphakia. Radiocarbon data for changes in sea levels collected and analysed previously must (a) be recorrected to take into account isotopic fractionation, and (b) recalibrated by using the new marine reservoir value. These new radiocarbon dates are analysed using Bayesian statistics. The resulting calendar dates for changes in sea level are younger than previously assumed. In particular the Great Uplift in western Crete in late antiquity must be dated to the fifth or sixth century AD, not to AD 365. Moreover, recent work on tectonics suggests that the Great Uplift need not have been accompanied by a catastrophic earthquake. Finally, we consider the consequences of the Great Uplift for some coastal sites in Sphakia.

Submerged speleothem in Malta indicates tectonic stability throughout the Holocene

The Holocene ◽  
2018 ◽  
Vol 28 (10) ◽  
pp. 1588-1597 ◽  
Author(s):  
Stefano Furlani ◽  
Fabrizio Antonioli ◽  
Timmy Gambin ◽  
Sara Biolchi ◽  
Saviour Formosa ◽  
...  
Keyword(s):  
Sea Level ◽  
Sea Level Changes ◽  
Radiocarbon Dates ◽  
The Holocene ◽  
Karst Environment ◽  
Marine Deposits ◽  
Archaeological Data ◽  
Decadal Scale ◽  
Term Data

Submerged caves represent potential archives of speleothems with continental and marine biogenic layers. In turn, these can be used to reconstruct relative sea-level changes. This study presents new data on the tectonic behaviour of the island of Malta during the Holocene. These data were obtained from a speleothem sampled, during an underwater survey, at a depth of −14.5 m, inside a recently discovered submerged cave. Since the cave was mainly formed in a subaerial karst environment, the presence of a speleothem with serpulids growing on its continental layers permitted the reconstruction of the chronology for drowning of the cave. The radiocarbon dates obtained from the penultimate and last continental layers of the speleothem, before a serpulid encrustation, were compared with synthetic aperture radar (SAR) and global positioning system (GPS) data, together with published sedimentological and archaeological data. The radiocarbon analyses provided an average age of 7.6 ka BP that perfectly aligns with the Lambeck’s model of Holocene sea level. Morevoer, long-term data agree with published archeological and sedimentological data as well as with SAR interpherometric and GPS trends on a decadal scale. We conclude that the Maltese islands were tectonically stable during the Holocene, and this tectonic behaviour still persists nowadays. On the contrary, new informations on older deposits, such as MIS5e (Maritime Isotope Stage, corresponding to 125 ka ago) were not found in the study area, confirming the lack of older Quaternary marine deposits in these islands.

scholarly journals Century-scale relative sea-level changes in West Greenland — A plausibility study to assess contributions from the cryosphere and the ocean

2012 ◽  
Vol 315-316 ◽  
pp. 86-93 ◽  
Author(s):  
L.M. Wake ◽  
G.A. Milne ◽  
A.J. Long ◽  
S.A. Woodroffe ◽  
M.J.R. Simpson ◽  
...  
Keyword(s):  
Sea Level ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
West Greenland

scholarly journals The Geomorphology of Glaciomarine Sediments in a High Arctic Fiord

2007 ◽  
Vol 42 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Jan Bednarski
Keyword(s):  
Sea Level ◽  
High Arctic ◽  
Sedimentation Rates ◽  
Sea Level Changes ◽  
Glacial Cycle ◽  
Relative Sea Level ◽  
Marine Deposits ◽  
Level Change ◽  
Last Glaciation ◽  
Glaciomarine Sediments

ABSTRACTA general geomorphic model describing marine transgressions and regressions under non-glacial conditions is applied to the glacial environment. The general model recognizes two variables: i) the rate of relative sea level change, and ii) the rate of sedimentation at the coastline. The interaction of the two variables determines the nature of transgression or regression at a particular shoreline. In glaciated areas both sedimentation rates and relative sea level changes are controlled mainly by glacioclimatic responses of the ice. This is best illustrated along arctic coastlines where glacioisostatic loading caused extensive marine inundations during, and immediately after, the last glaciation. Subsequent emergence in the early Holocene has exposed extensive raised marine deposits. Clements Markham Inlet, on the northernmost coast of Ellesmere Island, Northwest Territories, contains raised marine deposits which have a definite spatial and sequential distribution related to the glacial history. The general geomorphic model is used to explain the distribution and geomorphology of this sediment. As the glacial cycle proceeds the balance between fluxes of sediment input and rate of sea level rise or fall will have a direct bearing on the type of stratigraphie sequence found in a particular area.

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