The raised coral reef complex of the Kenyan coast: Tridacna gigas U-series dates and geological implications (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• The raised coral reef complex of the Kenyan coast: Tridacna gigas U-series dates and geological implications (Articolo in rivista) (literal)

Anno

• 2010-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1016/j.jafrearsci.2010.02.003 (literal)

Alternative label

• Accordi G.; Brilli M.; Carbone F.; Voltaggio M. (2010)
  The raised coral reef complex of the Kenyan coast: Tridacna gigas U-series dates and geological implications
  in Journal of African earth sciences (1994); Academic Press Elsevier, Inc., London (Regno Unito)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Accordi G.; Brilli M.; Carbone F.; Voltaggio M. (literal)

Pagina inizio

• 97 (literal)

Pagina fine

• 114 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

• http://www.journals.elsevier.com/journal-of-african-earth-sciences/#description (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 58 (literal)

Rivista

• Journal of African earth sciences (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

• doi:10.1016/j.jafrearsci.2010.02.003 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

• 1 (literal)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Accordi Giovanni, Istituto di Geologia Ambientale e Geoingegneria Brilli Mauro, Istituto di Geologia Ambientale e Geoingegneria Carbone Federico, Istituto di Geologia Ambientale e Geoingegneria Voltaggio Mario, Istituto di Geologia Ambientale e Geoingegneria (literal)

Titolo

• The raised coral reef complex of the Kenyan coast: Tridacna gigas U-series dates and geological implications (literal)

Abstract

• The Kenyan coast is characterized by a raised fossil reef complex cut by a series of morphological terraces. Shallow subtidal coralgal facies containing Tridacna gigas shells are found at different heights along the coast. Alpha-spectrometric U-series methods were applied to 18 T. gigas samples from different locations along this reef complex with an elevation range from 0 to 15 m above present sea level to obtain chronological information. Apparent U–Th ages, based on the assumption of closed system behaviour, correspond to early marine isotope stage (MIS) 5 (n = 17) and MIS 7 (n = 1). However, initial 234U/238U activity ratios exhibit a wide range, in many cases much greater than present seawater, which is likely to be associated with diagenetic alteration and migration of U-series isotopes. For this reason, we attempted a form of open system isochron dating after separating the Tridacna samples into three different groups on the basis of current elevation and distribution along the coast. An ‘isochron’ age of 120 ± 4 ka (1 sigma) was obtained for the higher elevation group, placed in the terraced central coastal area; another age, statistically undistinguishable from the previous one, of 118 ± 7 ka (1 sigma) was obtained for the group confined along the northern coast. These two groups correspond to a transgressive–regressive cycle connected to the maximum sea level highstand during the MIS 5e. A third ‘isochron’ age of 100 ± 4 ka (1 sigma) was obtained for the group confined along the southern coast, encompassing part of the isotopic substages MIS 5c and d. Based on these data, and on the ecology of T. gigas whose optimal present-day depth range can be considered of 3–10 m below sea level, a maximum tectonic coastal uplift rate of between, respectively, 0.12 and 0.18 mm a-1 was calculated for the period since formation of these shells, and then the paleobathymetry of Tridacna facies has been inferred. (literal)

Editore

• Academic Press Elsevier, Inc. (Editore)

Prodotto di

• Determinazione delle sorgenti di inquinamento e valutazione dei caratteri idrologici e idrogeologici degli acquiferi mediante metodi isotopici (TA.P04.021.004) (Modulo)
• Geologia del Quaternario, valutazioni di pericolosità geologica, sottosuolo di aree urbane. (TA.P05.025.003) (Modulo)
• Migrazione di radionuclidi naturali in formazioni argillose (TA.P07.014.007) (Modulo)
• Institute of environmental geology and geoengineering (IGAG) (Istituto)

Autore CNR

• FEDERICO CARBONE (Unità di personale interno)
• MAURO BRILLI (Unità di personale interno)
• MARIO VOLTAGGIO (Unità di personale interno)
• GIOVANNI ACCORDI (Persona)

Insieme di parole chiave

• Parole chiave di "The raised coral reef complex of the Kenyan coast: Tridacna gigas U-series dates and geological implications" (Insieme di parole chiave)

Incoming links:

Prodotto

• Institute of environmental geology and geoengineering (IGAG) (Istituto)
• Geologia del Quaternario, valutazioni di pericolosità geologica, sottosuolo di aree urbane. (TA.P05.025.003) (Modulo)
• Determinazione delle sorgenti di inquinamento e valutazione dei caratteri idrologici e idrogeologici degli acquiferi mediante metodi isotopici (TA.P04.021.004) (Modulo)
• Migrazione di radionuclidi naturali in formazioni argillose (TA.P07.014.007) (Modulo)

Autore CNR di

• MARIO VOLTAGGIO (Unità di personale interno)
• GIOVANNI ACCORDI (Persona)
• MAURO BRILLI (Unità di personale interno)
• FEDERICO CARBONE (Unità di personale interno)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Journal of African earth sciences (Rivista)

Editore di

• Academic Press Elsevier, Inc. (Editore)

Insieme di parole chiave di

• Parole chiave di "The raised coral reef complex of the Kenyan coast: Tridacna gigas U-series dates and geological implications" (Insieme di parole chiave)