Sedimentary Quartz Sand Deposit
Physical Process - Ground surface
Required Geological Setting
Neogene and Quaternary sediments
Occurrence
Sedimentary quartz sand deposits associated with sedimentary rocks. Deposits are usually associated with sedimentary kaoline deposits composed of kaolinite deposited in the fluvial to lacustrine circumstances. The deposit may include lignite. The protoliths are granitoid rocks such as I-type granite, S-type granite, Granodiorite, Diorite. Feldspars and micas in these granitoid rocks are argillized by chemical weathering and removed during the deposition process, and quartz grains are selectively concentrated.
Mineral Assemblages
Quartz, Kaolinite, Halloysite