Volcanic ash layers in the North Atlantic (DSDP Site 552A): A stratigraphic tool?

1989 ◽  
Vol 86 (2-3) ◽  
pp. 221-227 ◽  
Author(s):  
Liselotte Diester-Haass
Keyword(s):  
North Atlantic ◽  
Volcanic Ash ◽  
The North ◽  
The North Atlantic ◽  
Dsdp Site

A Younger Dryas Ash Bed in Western Norway, and Its Possible Correlations with Tephra in Cores from the Norwegian Sea and the North Atlantic

1984 ◽  
Vol 21 (1) ◽  
pp. 85-104 ◽  
Author(s):  
Jan Mangerud ◽  
Sven Erik Lie ◽  
Harald Furnes ◽  
Inger Lise Kristiansen ◽  
Leif Lømo
Keyword(s):  
Continental Shelf ◽  
Marine Sediments ◽  
North Atlantic ◽  
Volcanic Ash ◽  
Younger Dryas ◽  
Norwegian Sea ◽  
The North ◽  
Western Norway ◽  
Stratigraphic Position ◽  
The North Atlantic

A bed of volcanic ash up to 23 cm thick is found in lacustrine and marine sediments in western Norway. It is formally mamed the Vedde Ash Bed, and its age is approximately 10,600 yr B.P., i.e., mid-Younger Dryas. The bed consits of pure glass having a bimodal basaltic and rhyolitic composition. The geochemistry of the glass shards suggests an Icelandic source. By means of stratigraphic position and geochemistry, the ash is correlated with ash zones found in cores from the continental shelf, the Norwegian Sea, and the North Atlatic.

Plio-Pleistocene radiolarian biostratigraphy and palaeoceanography of the mid-latitude North Atlantic (DSDP Site 609)

1994 ◽  
Vol 131 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Simon K. Haslett
Keyword(s):  
North Atlantic ◽  
Deep Sea ◽  
Sea Surface ◽  
Abundance Distribution ◽  
The North ◽  
Radiolarian Biostratigraphy ◽  
The North Atlantic ◽  
First Time ◽  
Drilling Project ◽  
Dsdp Site

AbstractRadiolaria were examined throughout the Plio-Pleistocene of Deep Sea Drilling Project (DSDP) Site 609. Eight radiolarian datum-levels (first and last appearances) were identified, some for the first time in the North Atlantic. The recognition of these datums allows correlation between the Atlantic, Pacific and Indian oceans, through a previously published zonal scheme (Johnson et al. 1989). Zones NR1 to NR11 were recognized, although some zones had to be combined (NR1–2 and NR8–10) due to the absence of some stratigraphically important taxa. The relative abundance distribution of the radiolarian palaeoceanographical proxy Didymocyrtis tetrathalamus indicated three cool phases (0/0.56–0.75 Ma, 1.2–1.33/1.69–1.86 Ma, and 2.14–2.32/3.73– > 4.1 Ma) interrupted by two relatively warm episodes (0.56–0.75/1.2–1.33 Ma and 1.69–1.86/2.14–2.35 Ma). These fluctuations in sea-surface temperature (SST) correspond with palaeoclimatic events indicated by other proxies (e.g. Foraminifera), such as the onset of Northern Hemisphere glaciation. This study illustrates the usefulness of radiolaria in North Atlantic stratigraphical and palaeoceanographical analysis.

Sign in / Sign up

Export Citation Format

Share Document