Enrichment of 88Sr in continental waters due to calcium carbonate precipitation

- Continental carbonates are among the most 88Sr-depleted Sr reservoirs on earth.
- Δ88/86Sr between continental carbonates and precipitating waters is −0.218±0.014‰.
- Ca-carbonate precipitation is a significant mechanism in the continental Sr cycle.
- Average δ88/86Sr of marine carbonate rocks maybe higher than current literature value.