(Appendix) Planktonic foraminifera abundances in ODP Site 138-847B ...

• Main Authors: McKenna, V S, Farrell, John W, Murray, David W, Clemens, Steven C
• Format: Dataset
• Language: English
• Published: PANGAEA 1995
• Subjects: Event label; Sample code/label; DEPTH, sediment/rock; Depth, composite; AGE; Orbulina universa; Globigerinoides conglobatus; Globigerinoides ruber pink; Globigerinoides ruber white; Globigerinoides tenellus; Globigerinoides sacculifer wo sac; Globigerinoides sacculifer sac; Sphaeroidinella dehiscens; Globigerinella aequilateralis; Globigerina calida; Globigerina bulloides; Globigerina falconensis; Globigerina digitata; Globigerina rubescens; Turborotalita quinqueloba; Neogloboquadrina pachyderma sinistral; Neogloboquadrina pachyderma dextral; Neogloboquadrina dutertrei; Globoquadrina conglomerata; Globoquadrina hexagona; Pulleniatina obliquiloculata; Globorotalia inflata; Globorotalia truncatulinoides sinistral; Globorotalia truncatulinoides dextral; Globorotalia crassaformis; Neogloboquadrina pachyderma dextral and dutertrei integrade; Globorotalia hirsuta; Globorotalia scitula; Globorotalia anfracta; Globorotalia menardii; Globorotalia tumida; Globorotalia flexuosa; Globigerinita glutinata; Globorotalia theyeri; Foraminifera, planktic, other; Foraminifera, planktic; Foraminifera, planktic, whole test; Sedimentation rate; Density, dry bulk; Split; Sample mass; Accumulation rate, planktic foraminifera by number; Dissolution index; Drilling/drill rig; DSDP/ODP/IODP sample designation; Pacific; Neogloboquadrina pachyderma; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.807318; https://doi.pangaea.de/10.1594/PANGAEA.807318

Sediments from Site 847 in the eastern equatorial Pacific Ocean provide a record of the variability of the equatorial divergence and associated upwelling. We interpret the variation in foraminifer assemblages in the context of regional Oceanographic change. Our record is composed of three time slices selected from the last 0.9 Ma. A Q-mode analysis of foraminifer abundance data results in a four-factor model that was used to quantify the faunal changes and to characterize paleoceanographic variability. The species of foraminifers with high factor scores for each factor suggested a specific set of Oceanographic conditions. The timing of the high loadings for each factor appears to be associated with a particular part of a glacial cycle. Thus, we interpreted our findings in the context of the glacial/interglacial cycle proposed by Imbrie et. al. (1992). This idealized cycle consists of four stages that are defined by characteristic changes in specific elements of the climate system. We evaluated how such ... : DEPTH, sediment is given in mbsf. Time Slice 1 (TSI) covers oxygen isotope stages 1 to 6 (0-0.135 Ma), Time Slice 2 (TS2) covers stages 11 to 14 (0.395-0.572 Ma), and Time Slice 3 (TS3) covers stages 18 to 21 (0.704-0.852 Ma). ...