Sedimentological and clay mineralogical analysis of ODP sites in the central Fram Strait ...

• Main Author: Winkler, Amelie
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1999
• Subjects: Composite Core; Drilling/drill rig; Leg151; Joides Resolution; Ocean Drilling Program ODP; Fram Strait; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.712694; https://doi.pangaea.de/10.1594/PANGAEA.712694

This study presents the results of high-resolution sedimentological and clay mineralogical investigations on sediments from ODP Sites 908A and 909AlC located in the central Fram Strait. The objective was to reconstruct the paleoclimate and paleoceanography of the high northern latitudes since the middle Miocene.The sediments are characterised in particular by a distinctive input of ice-rafted material, which most probably occurs since 6 Ma and very likely since 15 Ma. A change in the source area at 1 1.2 Ma is clearly marked by variations within clay mineral composition and increasing accumulation rates. This is interpreted as a result of an increase in water mass exchange through the Fram Strait. A further period of increasing exchange between 4-3 Ma is identified by granulometric investigations and points to a synchronous intensification of deep water production in the North Atlantic during this time interval.A comparison of the components of coarse and clay fraction clearly shows that both are not ... : Supplement to: Winkler, Amelie (1999): Die Klimageschichte der hohen nördlichen Breiten seit dem mittleren Miozän: Hinweise aus sedimentologischen-tonmineralogischen Analysen (ODP Leg 151, zentrale Framstraße) (The climate history of the high northern latitudes since the Middle Miocene: indications from sedimentological and clay mineralogical analyses (ODP Leg 151, central Fram Strait)). Berichte zur Polarforschung = Reports on Polar Research, 344, 117 pp ...