“…On the longer time scale, however, previous research researches proposed that Ti concentration is an indicator of physical weathering and precipitation [ Dean et al , 2004; Selvaraj et al , 2007], and Rb/Sr ratio is an indicator of chemical weathering, and low Rb/Sr values indicating warm and humid climate [ Goldberg et al , 2007; Daryin et al , 2005; Kalugin et al , 2005, 2007; Jin et al , 2006]. Stratigraphically, the variations of Titanium show a weak decrease trend.…”