Diagenetic effects on strontium isotope (87Sr/86Sr) and elemental(Sr, Mn, and Fe) signatures of Late Ordovician carbonates

Dongping Hu , Dandan Li, Lian Zhou, Lilin Sun, and Yilun Xu

1School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;

2State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Graphical abstract

87Sr/ 86Sr of carbonates can still be diagenetically altered although the samples meet the stricter geochemical criteria of retention.

Public summary

■ The Monitor Range section records significantly higher87Sr/86Sr values than the coeval seawater.

■ The radiogenic87Sr/86Sr ratios can be fully attributed to diagenetic alteration.

■ A comprehensive approach that incorporates evaluation of87Sr/86Sr correlations with diagenetic indicators and numerical simulation is proposed to identify the primary seawater Sr isotope signal.