Abstract
The formation and preservation of sedimentary exhalative ( sedex) massive sulfide deposits in oceanic basins is tightly constrained by the rate of sedimentation. To estimate the relative input of terrigenous sedimentation and hydrothermal precipitation, the use of a simple graphic method, known as the isocon method and applied previously to metasomatic alteration processes is proposed. On two sedex deposits, the Champagne deposit in the Quebec Appalachian sapropelic sediments and the Atlantis II Deep in the Red Sea, this method allows a good estimate of the sedimentation input/hydrothermal input ratio ( S H ), and also enables a mechanism for computing the duration of fossil hydrothermal exhalative phenomena to be developed.
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