δ¹⁵N in planktonic foraminifera species Globigerina bulloides and Globorotalia inflata from IODP Site 361-U1475 ...

• Main Authors: Marcks, Basia, Santos, Thiago Pereira dos, Lessa, Douglas Villela de Oliveira, Cartagena-Sierra, Alejandra, Berke, Melissa A, Starr, Aidan, Hall, Ian R, Kelly, Roger P, Robinson, Rebecca S
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Agulhas Plateau; biogenic silica; Foraminifera-bound nitrogen isotopes; G. bulloides; G. inflata; mid-Pleistocene transition; opal; Subtropical Front; Event label; Sample code/label; Sample ID; Species; Species, unique identification Semantic URI; Species, unique identification URI; AGE; δ15N; δ15N, standard error; Nitrogen, total; Drilling/drill rig; Age model Starr et al., 2021; Chemiluminescence; Mass spectrometer Thermo Electron Delta plus IRMS; Exp361; Joides Resolution; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.945839; https://doi.pangaea.de/10.1594/PANGAEA.945839

Individual species were identified and ~550 individuals per species were picked from the >250 µm fraction under dissecting microscope for each sample. Approximately 7 mg of picked and identified foraminifera shells were crushed between glass microscope slides and rinsed with MilliQ water. Samples were cleaned and prepared for δ¹⁵NFB measurement as in Smart et al. (2020, doi:10.1029/2019gc008440). Nitrate concentrations were measured by chemiluminescence on a Teledyne Instruments (Model 200E) chemiluminescence NO/NOx analyzer (Braman & Hendrix, 1989; doi:10.1021/ac00199a007). δ¹⁵NFB was measured by bacterial conversion of nitrate to nitrous oxide (Sigman et al., 2001; doi:10.1021/ac010088e), with measurement of the δ¹⁵N of the nitrous oxide by automated extraction and gas chromatography-isotope ratio mass spectrometry (Casciotti et al., 2002; doi:10.1021/ac020113w ) on a Thermo Delta V Plus IRMS. The potassium nitrate reference materials IAEA-N3 and USGS 34 (+4.7 ‰ and 1.8 ‰, respectively) were used to ...