Badania genezy cechsztyńskich złóż miedzi w Polsce

• Autorzy: Kucha H. , Pawlikowski M.

Warianty tytułu

EN

Genetic investigations of copper Zechstein deposits, Poland

• Języki publikacji: PL

Abstrakty

PL

Złoża Cu Kupferschiefer mogły powstać wskutek mieszania się dwóch solanek. Górna, chłodna solanka była niezmineralizowana i bogata w Na, Ca, SO4 oraz Cl, pH > 7. Powstała ona w ewaporatach występujących nad złożami Cu na monoklinie przedsudeckiej. Dolna, gorąca solanka była bogata w Mg, K, Cl, SO4 oraz CO2, pH < 7 i mogła pochodzić z centralnej, ewaporatowej części basenu cechsztyńskiego z głębokości 6-7 km. Miała temperaturę 200-250°C i migrowała konwekcyjnie ku monoklinie przedsudeckiej wzdłuż spągu węglanów Z1. Proces strącania mineralizacji siarczkowej nastąpił w wyniku mieszania się obu tych solanek o silnym kontraście chemicznym i fizycznym oraz katalitycznego utleniania substancji organicznej czarnych łupków na stosunkowo niewielkich głębokościach monokliny przedsudeckiej. Granica solanek na ogół pokrywała się z kontaktem piaskowiec/ łupek Cu. Za istnieniem dolnej solanki związanej z ewaporatami przemawia obecność gniazd i żyłek sylwitu KCl, chlorargirytu AgCl oraz castaingitu potasowego w spągu łupków/stropie piaskowców Cu. Obecność dobrze zachowanych skaleni sodowych w górnej części, zaś skaleni potasowych w dolnej części horyzontu złożowego sugeruje istnienie systemu dwóch solanek. Część złóż miedzi występuje w odcinku profilu pozbawionym łupków. Może to świadczyć, że samo współdziałanie solanek było wystarczające do utworzenia mineralizacji Cu-Pb-Zn o znaczeniu ekonomicznym. Zmienność pionowa rozmieszczenia głównych metali od spągu ku stropowi w sekwencji od hematytu poprzez metale szlachetne do Cu, Pb i Zn jest powszechnie spotykana w złożach Cu Kupferschiefer.

EN

Kupferschiefer Cu deposits were probably formed as a result of two brines mixing. The upper cold brine (UCB) was base metal-free but rich in Na, Ca, SO4 and Cl with pH > 7 and originating from evaporates overlying the Cu deposits. The lower hot brine (LHB) was rich in Mg, K, Cl, SO4, CO2 and pH < 7 formed in the central part of the Polish Zechstein Basin at a depth of 6-7 km. The LHB was heated up to 200-250°C and was a subject of upward convection towards the Zechstein suboutcrops along the bottom of the Z1 carbonates. The mineralization process was a result of the mixing of the brines LHB and UCB, and catalytic autooxidation of organic matter of the black shale which operated at shallow depth of the Fore-Sudetic Monocline. The boundary of these brines generally overlapped the strike of the black shale. The presence of nests and veinlets of silvite (KCl), AgCl (chloargirite) and K-castaingite in the black shale bottom speaks in favor of the LHB existence. Parts of shale-free Cu deposits suggest that the action of two brines was capable of accumulation of economic Cu, Pb and Zn ore horizons. Where the boundary of brines overlaps the autooxidation zone (the black shale bottom) and also coincides with á and g radiation of thucholite concentrations of noble metals occur. The characteristic vertical distribution of the quadruplet hematite Cu Pb Zn from the bottom upwards is universal in the Kupferschiefer deposits.

Słowa kluczowe

PL

halokineza; czarne łupki; autooksydacja; dolna gorąca solanka; górna chłodna solanka; KCI; mieszanie solanek

EN

halokinesis; black shale; autooxidation; lower hot brine; upper cold brine; sylvite; brine mixing; convection; base metals

• Wydawca: Wydawnictwa AGH
• Czasopismo: Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
• Rocznik: 2010
• Tom: T. 36, z. 4
• Strony: 513--538
• Opis fizyczny: Bibliogr. [69] poz., rys., tab.

Twórcy

autor

Kucha H.

• Akademia Górniczo-Hutnicza, Wydział Geologii, Geofizyki i Ochrony Środowiska; al. Mickiewicza 30, 30-059 Kraków

autor

Pawlikowski M.

• Akademia Górniczo-Hutnicza, Wydział Geologii, Geofizyki i Ochrony Środowiska; al. Mickiewicza 30, 30-059 Kraków

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