(Table 1) Oxygen isotopic composition of planktonic foraminifera of ODP Holes 130-806B and 138-847B ...

• Main Authors: Chaisson, William P, Ravelo, Ana Christina
• Format: Dataset
• Language: English
• Published: PANGAEA 2000
• Subjects: Event label; Sample code/label; DEPTH, sediment/rock; AGE; Globigerinoides sacculifer sac, δ18O; Neogloboquadrina dutertrei, δ18O; Globorotalia tumida, δ18O; Drilling/drill rig; DSDP/ODP/IODP sample designation; Mass spectrometer VG Optima; Leg130; Leg138; Joides Resolution; Ocean Drilling Program ODP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.848108; https://doi.pangaea.de/10.1594/PANGAEA.848108

Foraminifer count and multispecies isotopic data from Ocean Drilling Program (ODP) Sites 806 (0°N, 165°E) and 847 (0°N, 95°W) are presented for the last 6.4 m.y. Faunal evidence shows a decline of taxa of Miocene origin between 4.5 and 4.0 Ma at both sites. Prior to this decline, Globoturborotalita species and Neogloboquadrina acostaensis dominated Sites 806 and 847 assemblages, respectively. Globoturborotalitids were not replaced by other thermocline dwellers after 4.2 Ma, which suggests a deepening of the thermocline and thickening of the warm pool at Site 806. At Site 847 in the eastern “cold tongue”, N. acostaensis was gradually replaced by N. dutertrei. After 4.2 Ma, there was also a large increase (from 0.7 to 1.3 per mil) in the difference between the d18O values of Globigerinoides sacculifer, a surface dweller, and Neogloboquadrina dutertrei, a seasonal thermocline dweller at Site 847; these data, in conjunction with faunal evidence, suggest that the temperature gradient in the upper photic zone ... : Supplement to: Chaisson, William P; Ravelo, Ana Christina (2000): Pliocene development of the east-west hydrographic gradient in the equatorial Pacific. Paleoceanography, 15(5), 497-505 ...