High resolution stratigraphy of the Faeroe-Shetland Channel and its relation to North Atlantic paleoceanography: the last 87 kyr
作者： L. Labeyrie , T.L. Rasmussen , Tj.C.E. van Weering
DOI: 10.1016/0025-3227(95)00145-X
关键词: Oceanography 、 Paleontology 、 Isotopes of oxygen 、 Geology 、 Paleoceanography 、 Stage (stratigraphy) 、 Holocene 、 Foraminifera 、 Last Glacial Maximum 、 Stratigraphy 、 Benthic zone
摘要: Abstract Two piston cores from the Faeroe-Shetland Channel have been investigated for stratigraphic and paleoceanographic correlation with Atlantic Ocean Norwegian Sea records. The high resolution analyzed downcore distribution of planktic benthic foraminifera oxygen isotopes. AMS 14 C dates position Ash layers I II form basis correlation. Core NA81-10 covers period isotope stage 3 to Recent (stage 1), while core NA81-04 stages 5a 1. Holocene is well represented in by 2 m sediment, whereas it only 50 cm which situated directly under main Deep Water outflow. transition 1 affected dissolution thus less clearly represented. show that Termination IA begins at 16 ka ends about 13 level. Last Glacial Maximum (LGM; defined 19-16 ka) characterized an IRD peak, faunal (planktic foraminifera) maxima (dated 17.3 18.25 a percentage Globigerina quinqueloba . Apparently open water conditions circulation within prevailed least 22.5 14.8 ka, during greatest part (including LGM) onto IA. A preservation maximum observed throughout 2. Isotope 3, nearly complete record substages both cores. Oxygen depletion peaks correlate fauna minima time North Heinrich events (H5-H1). Faunal data indicate deep generated Norwegian-Greenland repeatedly since 26 stops prior 22.5–20.8/20.5 between 14.9 (H3, H2 H1). All ca. are anticorrelated mainly controlled surface salinity changes. correlated temperature 87 ka. shows repeated presences Surface convection alternating shutdowns occurred Sea-Greenland beginning
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