(Appendix) Relative abundance of planktonic foraminifera in ODP Site 138-846 late Quaternary sediments ...

• Main Authors: Le, Jianning, Mix, Alan C, Shackleton, Nicholas J
• Format: Dataset
• Language: English
• Published: PANGAEA 1995
• Subjects: Sample code/label; DEPTH, sediment/rock; Depth, composite revised; Orbulina universa; Globigerinoides ruber; Globigerinoides tenellus; Globigerinoides sacculifer; Globigerinella aequilateralis; Globigerinella calida; Globigerina bulloides; Globigerina rubescens; Neogloboquadrina pachyderma dextral; Neogloboquadrina dutertrei; Composite Core; DSDP/ODP/IODP sample designation; Intercore correlation; Counting >150 µm fraction; Leg138; Joides Resolution; Ocean Drilling Program ODP; Neogloboquadrina pachyderma; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.808207; https://doi.pangaea.de/10.1594/PANGAEA.808207

High-resolution records of d18O and relative abundances of planktonic foraminifers were generated for ODP Leg 138 Site 846 for the past 800 k.y., with an average sampling interval of 3.6 k.y. The time scale was constructed by correlating the benthic d18O record to the SPECMAP and ODP Site 677 d18O time scales using the mapping function technique of Martinson et al. (1981). Our observations show that variations in the foraminiferal assemblages, although influenced by dissolution, are interpretable in terms of changing characteristics of upper ocean waters.Carbonate dissolution as indicated by fragmentation of planktonic foraminifers shows concentrated variance that is coherent with d18O at the 100 and 41 k.y. orbital periods. At these periods, maximum dissolution occurs during interglacial extremes. This finding differs from previous studies that have indicated that in this region percent carbonate minimum lags global ice volume minimum.N. dutertrei and dextral N. pachyderma dominate the assemblages, but do ... : Sediment depth is given in mcd (Shipboard composite depth). ...