Resolving an Apparent Imbalance in Seawater Stable Strontium Isotopes and Implications for the History of the Marine Carbonate Factory

# Resolving an Apparent Imbalance in Seawater Stable Strontium Isotopes and Implications for the History of the Marine Carbonate Factory

This dataset contains stable strontium isotope measurements (δ88/86Sr) and associated geochemical parameters for modern marine carbonate samples. The experimental work was designed to better constrain the isotopic composition of the global carbonate strontium sink, which represents a critical output flux in the marine Sr cycle. To achieve this, we compiled and analyzed a large suite of modern carbonate sediments spanning diverse depositional environments, including both neritic and pelagic settings.

## File: Nadeau_et_al_Figure_Data.xlsx

**Description:** This Excel workbook contains all 1) the Sr-isotope spike composition, 2) the geochemical measurements and metadata used in the study, including stable and radiogenic Sr isotope ratios, Ca isotope ratios, elemental ratios, mineralogical estimates, and sample information for modern neritic and pelagic carbonate sediments, and data presented in each figure.