Trace element partitioning in biogenic high-Mg calcite (Spirorbis) under in-situ near-natural conditions

S. spirorbis were cultured in a benthocosms facility for subsequent treatments: Ambient pCO2 (380 – 400 µatm) and temperature (‘Control’), 1100 µatm pCO2 (‘+CO2’) or +5°C temperature (‘+T’), and the combination of both elevated pCO2 and temperature (‘+CO2+T’). Each treatment has three replicates. After about 11 weeks of incubation for each seasonal experiment (spring, summer, and autumn experiments), we analyzed the bulk carbonate fraction of S. spirorbis samples, element ratios: Mg/Ca, Li/Ca, Sr/Ca, Ba/Ca, and Li/Mg in each treatment, included in this dataset. Water chemistry and element distribution coefficients are also included. Fourier Transform Infrared (FTIR) spectroscopic measurements and Raman spectrum results of samples and standards are shown in this file. FTIR spectra were used for phase identification, while Mg substitution was assessed from peak-maximum position shifts in both FTIR and Raman spectra, and lattice distortion was inferred from Raman peak broadening.