The Geology Geochemistry and Origin of Supplied Mineralization in Katta,Wollega Province
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Date
1980-07
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Addis Ababa University
Abstract
The Katta rocks form part of the Birbir group of the upper
compl ex s i tuated in the paleo- cal c-alkaline arc that runs northsouth
across the country and which compri ses thick sequences of
metavolcanic and metasedimen tary r ocks 0 The rocks are intensel y
folded and faulted o Their minera l ogy and texture indicate that
metamorphism is o f the greenschist facies o
Logging of five bore ho l es , their correlation and subs equerr
petrographic s tudies on selected samples are conducted and depth
variation i n miner a logy i s presented o
Geochemical studies on stre am sedime nt s , bed r ock and f l oat
samples, soil and core samples , and statistical tr eatment, of the
results show that there is lateral and vertical variati ons in the
copper and zinc mineralizations . The geochemical s oil maps show
that Cu , Zn , Pb , Ni , and Co mineralizations are concentr ated
along fo liation and bedding p laneso There is low litho logical
c ontro l of mi neralization o Moda l ana l ysis on the core samples
s how that main mineralization is a s sociated to carbonate o
Ore microscopic studies show that pyrite , chalco pyrite ,
magnetite , bornite , cubanite) bournonite , cuprite and sphal e r ite
are the ore minerals found occuring in bands , as d i ss eminati ons
and in veins o Two types of mineralization are recognized
syngenetic stratabound and e pigene t ic vein and dissemina t ed types .
It was the syn~enetic type that gave rise to epigenetic types as a
resul t of later met a morphi(: and supergene remobilization. 'r'he epigenetic
type is considered to be the main mineralization in the area o
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Geology