Marine Placer Deposit
Physical Process - Ground surface
Required Geological Setting
Neogene and Quaternary sediments
Occurrence
Marine placer deposits where heavy minerals such as magnetite are selectively concentrated by ocean waves and ocean currents near seashores based on the difference of specific density. Marine placer deposits are observed at modern seashores associated with magnetite-bearing basalt, andesite, gabbro, peridotite, and serpentinite bodies in hiterlands, and also as marine sediments in Neogene to Quaternary period. Ilmenite is also produced in deposits near gabbro bodies. Gold may be included in the deposit.
Distribution of marine placer deposits described in this site. Yellow is distribution of Neogene and Quaternary sediments.
Mineral Assemblages
Magnetite, Ilmenite, Forsterite, Hypersthene, Magnesio-hornblende, Quartz
Localities
- Saruhashi Mine (Tertiary, Iron sandstone)
- Fuji Mine (Tertiary, Iron sandstone)
- Daido Mine (Iron sandstone)