Figure 4
From: Modern Iron Ooids of Hydrothermal Origin as a Proxy for Ancient Deposits
Conceptual model of ooid formation in hydrothermal environments. (a) Conceptual model of the submarine hydrothermal system forming ooids. The model shows (not to scale) the relationships between the CO2-dominated and the Fe-rich thermal fluids. (b) Specific mechanisms for ooid formation, where the newly formed goethite precipitates in various stages, around abiogenic (volcanic) and/or biogenic (mostly siliceous sponge spiculae) particles deposited at the seafloor.
