Palaeoenvironment and Its Control on the Formation of Miocene Marine Source Rocks in the Qiongdongnan Basin, Northern South China Sea

Figure 7

The cross plot showing the relationship between U/Th ratios and Ni/Co ratios of Miocene source rocks in the Qiongdongnan Basin. Note: the samples in the chart are from the whole region of the basin. The information of the samples mainly represents the shallow water area because most of the wells distribute in the shallow water area (mainly in delta or coastal area).