Shoreline Displacement in Central Vestspitsbergen, and A Marine Section from the Holocene of Talavera on Barentsøya in Spitsbergen, with a Record of the Foraminifera [by] Rolf W. Feyling-Hanssen PDF Download
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![Shoreline Displacement in Central Vestspitsbergen, and A Marine Section from the Holocene of Talavera on Barentsøya in Spitsbergen, with a Record of the Foraminifera [by] Rolf W. Feyling-Hanssen PDF](https://books.google.com/books/content/images/frontcover/loZMcgAACAAJ?fife=w150-h200)
Author: Rolf W. Feyling-Hanssen
Publisher:
ISBN:
Category : Paleogeography
Languages : en
Pages : 34
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![Shoreline Displacement in Central Vestspitsbergen, and A Marine Section from the Holocene of Talavera on Barentsøya in Spitsbergen, with a Record of the Foraminifera [by] Rolf W. Feyling-Hanssen PDF](https://books.google.com/books/content/images/frontcover/loZMcgAACAAJ?fife=w80-h100)
Author: Rolf W. Feyling-Hanssen
Publisher:
ISBN:
Category : Paleogeography
Languages : en
Pages : 34
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Book Description
Author: Rolf W. Feyling-Hannssen
Publisher:
ISBN:
Category : Paleogeography
Languages : en
Pages : 34
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 34
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Book Description
Author: Rolf W. Feyling-Hanssen
Publisher:
ISBN:
Category : Paleogeography
Languages : en
Pages : 34
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Book Description
Author: Hans Petter Sejrup
Publisher:
ISBN:
Category : Foraminifera
Languages : en
Pages : 176
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Book Description
Author: S. D. Nio
Publisher: John Wiley & Sons
ISBN: 1444303767
Category : Science
Languages : en
Pages : 525
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Book Description
A special publication of the International Association of Sedimentologists This comprehensive scientific book of more than 500 pages features chapters by various authors. Holocene Marine Sedimentation in the North Sea Basin address topics that include: ripple, megaripple and sandwave bedforms in South Wales; shoreline development in St Andrews Bay, Scotland; and the origin of ridges off the Zeeland coast. Highlighted research includes: measurements of suspended sediment concentrations made at stations on a sandy intertidal zone in South Wales, as well as another study of two cores from the southern side of the Norwegian Channel concerning geotechnical properties, texture, sedimentary structures and mineralogical composition.
Author: Geological Society of London
Publisher: Geological Society of London
ISBN: 9781862390546
Category : Science
Languages : en
Pages : 340
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Author: Haley Hindes
Publisher:
ISBN:
Category :
Languages : en
Pages : 73
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Post-Last Glacial Maximum (since ca. 20,000 cal yr BP) sediments of the Sunda Shelf (southern South China Sea) are generally thin, with the exception of incised valleys where thicker accumulations tend to occur. These valleys provide a sedimentary record that preserves Holocene environmental changes. In the summer of 2014, two ca. 2 m gravity cores were collected on the Sunda Shelf in ca. 60 m of water ca. 52 km from the mouth of the Terengganu River off northeast peninsular Malaysia. Both cores were sampled in 1 cm contiguous intervals and analyzed for magnetic susceptibility of bulk sediment (BMS), elemental composition (X-ray fluorescence, XRF), and oxygen and carbon stable isotopes on the planktonic foraminifer Globigerinoides ruber. The chronology of the cores, based upon eight AMS radiocarbon age estimates on the benthic foraminifer Cavarotalia annectens, covers most of the Holocene. According to previous work, the Holocene evolution of the Sunda Shelf was largely controlled by the transgression of the South China Sea (SCS) shoreline following the Last Glacial Maximum. Several sea-level curves suggest sea level in the area had reached ca. -60 m by the start of the Holocene (ca. 11,700 cal yr BP). According to this study, at ca. 10,000 cal yr BP, the Sunda Shelf off northeast Peninsular Malaysia was already covered by ca. 30 m of water, evident by the presence of benthic foraminifera and marine mud throughout both cores. The study area transitioned from a shallow, muddy, nearshore environment to an open shelf environment (ca. 60 m water depth and at least 50 km from shore) during the 10,000 - 6,400 cal yr BP time interval. This is indicated by steadily decreasing Al, Ti, and Fe concentrations up-core, steadily increasing Ca concentrations up-core, and the first occurrence of planktonic foraminifera at ca. 7,000 cal yr BP. Between 6,000 - 4,000 cal yr BP, previous studies indicate the mid-Holocene sea-level highstand was reached. This study suggests the presence of a possible diastem at ca. 6,400 cal yr BP in TER14-GC5 based on an abrupt change in BMS and XRF data, which could be related to the maximum flooding surface. Core TER14-GC7 reveals the same shift in elemental and BMS trends at ca. 6,400 cal yr BP, but the transition is more gradual. The up-core profile of XRF and BMS trends reveal a shift from higher BMS values to lower BMS values, steady Ca concentrations, and higher but fluctuating presence of planktonic foraminifera after ca. 6,400 cal yr BP. The changes recorded by the two cores during the ca. 6,400 - present time interval are interpreted as the late transgressive systems tract transitioning to the highstand systems tract (HST). The HST is typically characterized by fine-grained sediments, with abundant foraminifera, that were deposited as the rate of sea-level rise slowed. However, the changes recorded during this time interval could also be explained by a decrease in precipitation in the area, possibly due to a decrease in monsoon intensity. Further investigation is needed to properly understand the time interval from ca. 6,400 cal yr BP - present in order to determine whether trends in the data sets are due to climate or other environmental change.
Author: Jessica Kegel
Publisher:
ISBN:
Category : Cedar Island (Carteret County, N.C. : Island)
Languages : en
Pages : 83
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Book Description
Future sea-level rise will dramatically affect coastal landscapes and populations. The coast of North Carolina (USA) is particularly vulnerable to sea-level rise because its low-lying coastal plain is expansive, has a low gradient, provides significant ecosystem services and is economically important. In order to understand how future sea-level rise may affect the coast, it is necessary to study past sea-level rise. Widespread salt-marshes compose much of North Carolina's coastal system, providing an excellent environment from which to produce relative sea-level reconstructions using salt-marsh foraminifera, whose distribution is controlled by tidal elevation. Distinctive assemblage zones related to different tidal ranges can be recognized in salt-marsh foraminiferal assemblages, allowing them to be used as a proxy for reconstructing sea level as sea-level indicators. Foraminiferal assemblages from surface samples along two transects at Sand Hill Point on Cedar Island, North Carolina added to an existing modern training set of paired observations of foraminiferal assemblages and tidal elevation; these data provide local analogues for interpreting fossil assemblages using a locally weighted-weighted average (LWWA) regression model. Foraminiferal assemblages preserved in a radiocarbon-dated core of salt-marsh peat from Sand Hill Point were used to produce a continuous, high-resolution late Holocene relative sea-level reconstruction. The existing late Holocene RSL reconstruction from North Carolina is based on two sites: Sand Point on Roanoke Island and Tump Point on Cedar Island. The Sand Point record spans the last ~2200 years, but the Tump Point record spans only the last ~1000 years. Therefore, the sea-level history described from 200 BC to 1000 AD is based on only one site. The new sea-level reconstruction from Sand Hill Point extends the existing record from nearby Tump Point, NC by 1400 years, producing a high resolution, continuous record of sea-level change spanning 1500 BC - 1915 AD. This new record tests whether patterns and rates of late Holocene sea-level changes reconstructed elsewhere in North Carolina are consistent throughout the region. The calculated average rate of relative sea-level rise for Sand Hill Point of 0.7 mm/year is consistent with patterns of regional rates along the US Atlantic coast, which may be partly attributed to isostatic response to deglaciation of the Laurentide Ice Sheet.
Author: Joseph Augustine Cushman
Publisher:
ISBN:
Category : Foraminifera
Languages : en
Pages : 582
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