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- W1520307079 abstract "The word calamine, designating non-sulphide Zn-ores of supergene origin in carbonate rocks, originates from the Belgian locality where an ore deposit was exploited from the 14 th century up to 1884. The genesis and age of La Calamine, described in the literature as a palaeokarstic type of deposit, have never been fully understood. Likewise, the age of the deep supergene alteration of Zn-Pb veins exploited in Belgian and German neighbouring mining districts has never been clearly determined. This paper aims at identifying the geological constraints responsible for the genesis of willemite-smithsonite-bearing La Calamine deposit, as well as of the deep- reaching gossans of the surrounding Zn-Pb veins. The kaolinised regolith remnants ranging from Uppermost Jurassic to Lower Cretaceous, which developed on the post-Variscan palaeosurface, could be one of the surface expressions of the weathering responsible for the genesis of non-sulphide Zn-ore deposits in Belgium and Germany. Locally, Upper Cretaceous sediments, whose deposition interrupted the weathering process, cover the regolith. Neither Cainozoic weathering, that was responsible in Belgium for halloysite accumulations at the bottom of giant cryptokarsts, nor Quaternary landscape modelling, should have played a major role in the formation of the economic calamine-type Zn-deposits." @default.
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- W1520307079 date "2005-01-01" @default.
- W1520307079 modified "2023-09-26" @default.
- W1520307079 title "THE CALAMINE-TYPE ZINC-LEAD DEPOSITS IN BELGIUM AND WEST GERMANY: A PRODUCT OF MESOZOIC PALAEOWEATHERING PROCESSES" @default.
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