**Table 2.** *Cont.*


**Table 2.** *Cont.*


**Table 2.** *Cont.*

**Figure 4.** Diagrams showing (**A**) Si content tested by XRF, amorphous silica content calculated through the new method, and Si content in crystalline minerals. (**B**) cross plot of the amorphous silica content with crystalline quartz content in samples of the different lithofacies in the Lucaogou Formation.
