|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 32 van 56 gevonden artikelen
| Titel: |
Paleoenvironmental Conditions as Recorded by Globigerinoides Sacculifer and Globigerinoides Ruber from the Northern Red Sea |
| Auteur: |
Nijem M. Yusuf |
| Verschenen in: |
Journal of applied sciences |
| Paginering: | Jaargang 7 (2007) nr. 2 pagina's 155-164 |
| Jaar: |
2007 |
| Inhoud: |
The distribution of Globigerinoides sacculifer and Globigerinoides ruber have been investigated to reconstruct the environmental conditions prevailed during the deposition of Late Pleistocene sediments in four cores from the central and northern Red Sea. The anticyclic relation between both species has been successfully used to identify ecostratigraphic events in the northern Red Sea. The foraminiferal assemblage in the southern Red Sea is strongly masked by imported spicemens via the inflow of water from the Gulf of Aden. Its influence extends far beyond the convergence zone to the northern Red Sea. The dominance of G. sacculifer over G. ruber in Holocene sediments reflects normal marine conditions similar to those existed at present in the northern Red Sea. Strong south-north salinity and nutrient gradients have been developed during the LGM, due to reducing influx of water from the Gulf of Aden to the basin. The influence of Aden waters during the Upper Wuerm Pleniglacial in the southern Red Sea probably extended in some events to the central Red Sea and the salinity remained much below the tolerance limit of G. sacculifer and no aplanktonic zone has been developed. Rising salinity beyond 49 psu, the threshold for planktonic forams, resulted in the development of aplanktonic zone. Dust minerals carried by wind as well as the productivity are the main sources influencing the sedimentation rates and the composition of the sediments during the Holocene. Terrigenous input of material became more important during the Upper Wuerm Pleniglacial when large areas of the shelf were exposed. |
| Uitgever: |
Asian Network for Scientific Information, Pakistan (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 32 van 56 gevonden artikelen
| << vorige | volgende >> |