Stable oxygen and carbon isotope ratios for Early to Middle Cretaceous benthic and planktonic foraminifera of DSDP Hole 62-463 from the Mid Pacific Mountains (Table 1), supplement to: Price, Gregory D; Hart, Malcom B (2002): Isotopic evidence for Early to mid-Cretaceous ocean temperature variability. Marine Micropaleontology, 46(1-2), 45-58

• Main Authors: Price, Gregory D, Hart, Malcom B
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2002
• Subjects: DEPTH, sediment/rock; Sample code/label; Epoch; Gavelinella sp., δ13C; Cyclocarya aschutassica; Temperature, calculated; Gyroidinoides sp., δ13C; Gyroidinoides sp., δ18O; Hedbergella delrioensis, δ13C; Hedbergella delrioensis, δ18O; Hedbergella sp., δ13C; Hedbergella sp., δ18O; Osangularia sp., δ13C; Osangularia sp., δ18O; Planomalina buxtorfi, δ13C; Planomalina buxtorfi, δ18O; Praeglobotruncana stephani, δ13C; Praeglobotruncana stephani, δ18O; Rotalipora appenninica, δ13C; Rotalipora appenninica, δ18O; Rotalipora cushmani, δ13C; Rotalipora cushmani, δ18O; Rotalipora gandolfii, δ13C; Rotalipora gandolfii, δ18O; Rotalipora greenhornensis, δ13C; Rotalipora greenhornensis, δ18O; Rotalipora ticinensis, δ13C; Rotalipora ticinensis, δ18O; Rotalipora sp., δ13C; Rotalipora sp., δ18O; Ticinella sp., δ13C; Ticinella sp., δ18O; Drilling/drill rig; DSDP/ODP/IODP sample designation; Mass spectrometer VG Prism Series II; Calculated from stable oxygen isotopes; Leg62; Glomar Challenger; Deep Sea Drilling Project DSDP; Pacific; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.678482; https://doi.pangaea.de/10.1594/PANGAEA.678482

Stable isotopic measurements have been made on planktonic and benthic foraminifera of Early to mid-Cretaceous (Early Albian-Cenomanian) age from DSDP site 463 located in the Pacific Ocean. The degree of alteration of the foraminifera has been assessed through the application of scanning electron microscopy. The oxygen isotope data support the view that during the Cenomanian 'globigerine' foraminifera, such as the genus Hedbergella, inhabited near-surface waters, whilst the flattened, keeled, morphotypes lived deeper within the water column. The carbon isotope data reveal a more complex pattern as the delta13C values from planktonic species essentially show a large overlap, which is interpreted in terms of a weak delta13C gradient existing in the upper part of the ocean. In contrast, the oxygen isotope data from planktonic foraminifera from the Late Albian display no discernible depth stratification pattern and the delta13C data also show a large overlap of values indicative of a complete disruption of the upper part of the thermocline. A relatively low surface to bottom water temperature gradient within the Early-Middle Albian part of the succession may reflect a well-mixed ocean. Inferred cool ocean temperatures (and/or high salinities) for the Early Albian may reflect increased oceanic poleward heat transport. An increase in temperature (and/or decrease in salinity) in the Cenomanian suggests a reduction of the poleward heat flux, promoting the build-up of limited polar ice during this period of tropical warmth. : Temperatures calculated using the equation of Erez and Luz (1983) and assuming a deltaw of -1.0? (SMOW)