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The Okinawa trough is a spreading back-arc basin featuring emitting hydrothermal solutions (black chimney type) and modern sulfide precipitation on the sea floor. The study of fluid inclusions in water-rock interaction products in the Jade hydrothermal field indicates that the deep hydrothermal system beneath the sea floor is fairly rich in gas and there are two independent and coexisting fluids-CO 2-hydrocarbon fluid and salt aqueous fluid. On the whole, the composition of CO 2-hydrocarbon fluid inclusions is similar to that of the fluid inclusions in natural gas fields. The dominant composition of the inclusions in aqueous fluid is H 2O with CO 2 and CH 4 being oversaturated. The salt aqueous fluid of the Jade hydrothermal system might be emitted through a black chimney, whereas CO 2-rich fluids discharge CO 2 bubbles and CO 2 hydrate through fissures. Hydrocarbons in gas phase or in fluid might be enclosed somewhere under the sea. Large storage of CO 2-CH 4-H 2S gas or fluid and reaction of this gas or fluid with salt water will lead to commercial sulfide deposits.
The Okinawa trough is a spreading back-arc basin featuring emitting hydrothermal solutions (black chimney type) and modern sulfide precipitation on the sea floor. The study of fluid inclusions in water-rock interaction products in the Jade hydrothermal field that that the deep hydrothermal system beneath the sea floor is fairly rich in gas and there are two independent and coexisting fluids-C02-hydrocarbon fluid and salt aqueous fluid. On the whole, the composition of C02-hydrocarbon fluid inclusions is similar to that of the fluid inclusions in The dominant composition of the inclusions in aqueous fluid is H 2O with CO 2 and CH 4 being oversaturated. The salt aqueous fluid of the Jade hydrothermal system might be emitted through a black chimney, while CO 2-rich liquids discharge CO 2 bubbles and CO 2 hydrate through fissures. Hydrocarbons in gas phase or in fluid might be enclosed somewhere under the sea. Large storage of CO 2-CH 4-H 2S gas or fl uid and reaction of this gas or fluid with salt water will lead to commercial sulfide deposits.