Figure 5.

Comparisons between SiO₂ and Ti contents, Rb/Sr ratios of core QH0708 (thin line, triangle) and core QH0711 (dashed line, square), and the stacked precipitation index (thick curve). The stacked precipitation index is the average of the normalized C/N_org, the detrended total organic carbon (TOC_detrended), and -δ¹³C_org (see [8,12] for details). Note that the element contents of Core QH0708 are systematically higher than those of QH0711, consistent with the corresponding spatial patterns (see Fig.3).