24. COMPARISON OF THE PLEISTOCENE RECORDS OF THE RADIOLARIAN CYCLADOPHORA DAVISIANA AT HIGH-LATITUDE SITES OF THE DEEP SEA

The recovery from the North Atlantic (Site 611) of a continuous Pleistocene sedimentary record with a siliceous mi-crofaunal component made it possible to compare the high-latitude abundance pattern of the radiolarian species Cycla-dophora davisiana in the Atlantic with that produced from analyses o...

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Bibliographic Details
Main Authors: Drilling Project, Joseph J. Morley, Lamont-doherty Geological
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Subjects:
Pacific
North Atlantic
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.571.2025
http://www.deepseadrilling.org/94/volume/dsdp94pt2_24.pdf
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Summary:The recovery from the North Atlantic (Site 611) of a continuous Pleistocene sedimentary record with a siliceous mi-crofaunal component made it possible to compare the high-latitude abundance pattern of the radiolarian species Cycla-dophora davisiana in the Atlantic with that produced from analyses of a high-latitude record (Site 580) from the north-west Pacific. Previous studies had shown that the late Pleistocene (0-0.45 Ma) abundance variations of this species in these high-latitude regions were similar. Cycladophora davisiana maxima in the North Atlantic record reach abundance levels three to four times higher than C. davisiana maxima registered in sediments from the northwest Pacific site. This difference in magnitude of abun-dance peaks is most likely an effect of the more northerly location of Site 611 (53°N) compared with that of Site 580 (42 °N), since high-latitude time-slice studies have shown a direct relationship between increasing latitude and C. davisi-ana abundance. Discontinuous preservation of radiolarians in sediments from North Atlantic Site 611 allows only ten-tative correlation of the North Atlantic and northwest Pacific C. davisiana abundance curves. These correlations are confined to those portions of the cores where ages are tightly constrained by magnetic boundaries, and to intervals with comparable sedimentation rates.

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