Abstract
Pb-Zn-Ba occurrences in Triassic metasediments of the southern zone of sediments (sudliche Sedimenthulle) of the Gotthard Massive in Central Switzerland were studied in the Passo del Lucomagno-Passo della Greina area. The Triassic sequence constitutes the initial phase of the Mesozoic transgression. The ore minerals (sulfides, barite, and fluorite) are located at the base of this sequence in quartzites and dolomitic marbles. Their geometric distribution is conformable with the bedding, and they occur as disseminations, lenses, and porphyroblasts. The regional epimetamorphism, consisting of at least two periods, has affected both simultaneously, the ore minerals and the country rock. Fluid inclusion data reflect the temperature conditions of the regional metamorphism. The ore mineral occurrences are comparable and correlatable with other Triassic stratabound deposits in the Eastern and the Southern Alps, but also in the Central Alps for example in the Binntal. A synsedimentary origin for the ore minerals of the Passo del Lucomagno-Passo della Greina area is suggested.
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