potash 考研

The shallow polyhalite potash deposit in Sichuan are distributed in the north plunge top of Huayingshan anticline where is anhydrock of earlier Mesozoic Triassic period.

四川浅层杂卤石钾矿分布于华蓥山背斜北倾没端下中三叠统之硬石膏岩层中。

Therefore, the albitization of plagioclase is shown in the early stage of diagenesis and albitization of potash feldspar appears only in the late stage of diagenesis.

因此，斜石石化可见于成岩早期，而钾石石化只发生于成岩晚期。