Fig. 3
From: Cenozoic global cooling and increased seawater Mg/Ca via reduced reverse weathering
Mechanism for reverse weathering affecting seawater Mg/Ca and climate. The proposed mechanism by which geographic reorganization of biogenic Si deposition and a reduction of global authigenic clay formation could cause an increase in seawater Mg/Ca and global cooling, as is observed over Cenozoic. The decreased sink of alkalinity in the ocean would be balanced by a reduction in global silicate weathering until the charge-weighted masses of sources are balanced by the sinks of alkalinity
