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Epidosites (epidote- and quartz-rich rock with granoblastic texture) from the Solea graben are believed to form from upflowing hydrothermal fluid that deposited massive sulfide ores at the seawater-sea-floor interface of the Cretaceous age oceanic crust. Epidosite within the graben occurs as massive epidosite (epidosite concentration greater than 80%) and zones of incipient epidotization (between 5% and 80%). Regions of incipient epidotizations are characterized by the juxtaposition of greenschist facies alteration and epidosite; the fluids responsible for each of these alteration styles had similar oxygen isotope compositions and temperatures. Petrographic observations suggest that the epidosite protolith was a previously altered rock....

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