Sea Surface Temperature estimates and benthic foraminifera stable isotopes from IODP 1406 over the Oligocene Miocene time interval

• Main Authors: Guitián, José, Phelps, Samuel, Polissar, Pratigya J, Ausín, Blanca, Eglinton, Timothy Ian, Stoll, Heather M
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2021
• Subjects: Event label; Sample code/label; DEPTH, sediment/rock; AGE; Alkenone, C37 total C372+C373; Alkenone, unsaturation index UK'37; Sea surface temperature; Tetraether index of 86 carbon atoms; Branched and isoprenoid tetraether index; Foraminifera, benthic δ18O; Foraminifera, benthic δ13C; Sortable-silt mean; Size fraction > 0.063 mm, sand; Helicosphaera spp.; Drilling/drill rig; SST, from UK'37, BAYSPLINE Tierney and Tingley, 2018; SST, from TEX86, BAYESPARE Tierney and Tingley, 2015; Exp342; Joides Resolution; Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; Antarctic; The Antarctic; Antarc*; Ice Sheet; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.928601; https://doi.pangaea.de/10.1594/PANGAEA.928601

Here, we present a new record of SST for the time interval 30 to 17 Ma derived from the long‐chain alkenone unsaturation ratio uk'37 and TEX 86 at Integrated Ocean Drilling Program Site 1406A in the midlatitude North Atlantic. Results confirm that warm temperatures from 24°C to over 30°C prevailed in midlatitudes in this time and suggest a transition from colder early‐middle Oligocene to warmer average conditions after 24.5 Ma. Complex and temporally varying relationships are observed between North Atlantic SST and benthic δ18O in paired samples. Significant covariation is only observed around the Oligocene‐Miocene transition, coincident with a lower average marine ice extent. These North Atlantic temperature records provide a new context in which to examine the stability of climate and the Antarctic ice sheet during the Oligocene and early Miocene.