Hydrological control of river and seawater lithium isotopes.

ABSTRACT: Seawater lithium isotopes (δ⁷Li) record changes over Earth history, including a ∼9‰ increase during the Cenozoic interpreted as reflecting either a change in continental silicate weathering rate or weathering feedback strength, associated with tectonic uplift. However, mechanisms controlling the dissolved δ⁷Li remain debated. Here we report time-series δ⁷Li measurements from Tibetan and Pamir rivers, and combine them with published seasonal data, covering small (<10²  km²) to large rivers (>10⁶ km²). We find seasonal changes in δ⁷Li across all latitudes: dry seasons consistently have higher δ⁷Li than wet seasons, by -0.3‰ to 16.4‰ (mean 5.0 ± 2.5‰). A globally negative correlation between δ

SUBMITTER: Zhang F 

PROVIDER: S-EPMC9187753 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature