Mineralizations at Keban
and its surroundings are generally observed at the contacts of granitoids and epimeta-
morphic rocks, in Nimri formation and in Keban marbles. Lead-zinc mineralizations
in this region are previously interpreted as skarn type occurrences associated with
granitoids. In this study, predominantly carbonate mineralizations in the carbonate
rocks of Nimri formation and sulphide and carbonate ores within the Keban marbles
are investigated. As a result of mineralog- ical, petrographical and geochemical
studies, some significant evidences indicate that the mineralizations are not directly
relat- ed with the skarn type associated with granitoids. According to the limited
data collected during this study, the view that the min- eralizations, present in
Nimri formation and Keban marble, are mobilized with the influence of granitoids
becomes significant. Mineralizations taking place earlier than mobilization are
discussed by exhalative sedimentary (SEDEX) type and Mississippi Valley Type (MVT)
relying on the present data. Some evidence is found for SEDEX type. While primary
occurrences are getting their new positions by means of secondary processes, metallic
contents of primary occurrences are enriched. Mobilizations re- lated with metamorphism
and/or granitoid impact and enrichment processes caused by weathering are out of
the study. The main result of this study is the necessity of new other revitalization
of discussions about the origin of primary occurrences for contribution to science
and economy.
___
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