Les gisements de cuivre et métaux associés dans le ......J.Cailteux : Les gisements de cuivre et métaux associés dans le Katanguien en R.D.C. - Cu-Co occurs as a sulfide stratiform

Les gisements de cuivre et métaux associés dans le Katanguien en République Démocratique du Congo

Colloque

La « Quête des Ressources » en Afrique Centrale (2)Le secteur minier en République Démocratique du Congo (RDC)

État des lieux et perspectives

1-3 décembre 2010, Tervuren (Belgique)

J.L.H. Cailteux

J.Cailteux : Les gisements de cuivre et métaux associés dans le Katanguien en R.D.C.

CAC

III

III

IV

VT-F

Kzi

NkNch

K-Ch Muf

LuMw

L

LKKK

M-K-L

L-E-RK

L

KaSh


CONGO

ZAMBIE

III

III

IV

V

LKipushi

Kabwe

Kansanshi

Dikulushi


Basement

Nchanga Granite 883 Ma

Opening of a continental riftDiscordant basal conglomerate

Kiubo

Mongwe

Gombela

Lubudi

Kanianga

Lusele

Katete

Monwezi

Kipushi

Kakontwe

Kaponda

Bunkeya

Muombe

± 635 Ma

NGUBA

KUNDELUNGU

ROAN

Katanguien

Upper Roan Dipeta

Kitwe / Mines

Mwashya Extension-related magmatism 735 - 765 Ma

Grand ConglomératCorrelated to theSturtian glaciogenic event ± 740 Ma

Petit Conglomérat correlated to theMarinoan glaciogenic event

Carbonate-siliciclastic rocks

Cap-carbonates


Cap-carbonates

Mindola / RAT

Basement


Kiubo

Mongwe

Gombela

Lubudi

Kanianga

Lusele

Katete

Monwezi

Kipushi

Kakontwe

Kaponda

Bunkeya

Muombe

± 635 Ma

NGUBA

KUNDELUNGU

ROAN

Katanguien

Upper Roan Dipeta

Kitwe / Mines

Mwashya Extension-related magmatism 735 - 765 Ma




Cap-carbonates


Cap-carbonates

D1 deformation phase ~ 710 to 600 Ma - folding of the Katangan pile- dislocation of the RAT & Dipeta-UR - NW folding & thrust

Main thrust surface of the D1 deformation phase

Syn-orogenic continental molasse

Mindola / RAT


Coulissement

Basement



Sampwe

Ngule

Syn- to post-orogenic continental molasseFilling of the foreland basin

Main thrust surface of the D1 deformation phase


Upper Roan Dipeta

Kitwe / Mines

Mindola / RAT

ROAN

Extension-related magmatism 735 - 765 Ma Mwashya

D1 deformation phase ~ 710 to 600 Ma - decolement & dislocation of the RAT & Dipeta-UR - N/NE folding & thrust

Tabular (Plateaux) formations Biano< 573 Ma

Katanguien

NGUBA

KUNDELUNGU



Cap-carbonates

Cap-carbonates

Kiubo

Mongwe

Gombela

Lubudi

Kanianga

Lusele

Katete

Monwezi

Kipushi

Kakontwe Kaponda

Bunkeya

Muombe

± 635 Ma



Basement



Sampwe

Ngule Main thrust surface of the D1 deformation phase


Upper Roan Dipeta

Kitwe / Mines

Mindola / RAT

ROAN

Extension-related magmatism 735 - 765 Ma Mwashya

Tabular (Plateaux) formations Biano< 573 Ma

Katanguien

NGUBA

KUNDELUNGU Kiubo

Mongwe

Gombela

Lubudi

Kanianga

Lusele

Katete

Monwezi

Kipushi

Kakontwe Kaponda

Bunkeya

Muombe

± 635 Ma

Stratiform Cu-Co-(Ni-U-Au)(Kambove, Kamoto,

Fungurune, Luiswishi, …)

< 820 Ma Stratiform Cu-Co-(Ag)(Konkola, Kinsenda, Nkana, Mufulira, …)

?Cu (Niamumenda, …)

Stratiform ? fault-related Cu-Co(Shituru, Tilwezembe, …)

?

< 600 Ma Fault-related Cu-Pb-Zn-Ag Dikulushi

< 530 Ma Fault-related Cu-AgLufukwe (Post-orogenic)

680 Ma Fault-related Zn-Pb-Ag-V Kabwe

451 Ma Vein Zn-Pb-Cu-(Cd-Ge-Ag)Kipushi (Kabwe ?)512-502 Ma Cu-Au Kansanshi


Thrust napes in the Luiswishi area

- typical example of stratiform Cu-Co deposit in the Congo part of the Copperbelt

- napes thrust to the north are lying on Mongwe-Kiubo fm through a megabreccia

- the megabreccia includes mainly blocs of the Roan Group, up to several km-size

- on the southern margin of the megabreccia, Mwashya fm are sheared and duplicated

- on the northern margin, the thrust has folded the Mongwe – Kiubo formations


Thrust napes in the Luiswishi area

- Luiswishi is a syncline structure, lying on its northern flank; it includes fm of Mines in the

central part & of RAT in the external part

LUISWISHIdeposit

- The structure shows (1) axial fault and (2) cross-cutting faults, both resulting from brittle tectonic

- A shearing parallel to stratigraphy occurs along RAT-Mines sbgr, and is marked by a breccia

composed with both RAT & Mines fragments


- Cu-Co occurs as a sulfide stratiform mineralisation that results from syn-diagenetic

processes, followed by metamorphic-hydrothermal remobilizations and enrichments

- Post-tectonic weathering dissolved the carbonate of the rocks in the superficial zone

of the deposits ; the limit of the weathered zone is marked here by the brown line

- This weathering also oxidized, remobilized & enriched the mineralization, giving way

locally to very high grade oxidized concentrations


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Les gisements de cuivre et métaux associés dans le ......J.Cailteux : Les gisements de cuivre et métaux associés dans le Katanguien en R.D.C. - Cu-Co occurs as a sulfide stratiform