Lead-isotope evidence for a Hercynian origin of the Salsigne gold deposit (Southern Massif Central,France) |
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Authors: | M Le Guen J L Lescuyer E Marcoux |
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Institution: | (1) Laboratoire de Géochimie Isotopique, Université des Sciences et Techniques du Languedoc (USTL), Place E. Bataillon — 34095, 5 Montpellier cedex, France;(2) GEOTECSIS S.A.R.L., Cap Alpha, 34830 Clapiers, France;(3) BRGM, Orléans, France |
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Abstract: | The Salsigne gold deposit contains a complex association of sulphide layers, gold-rich disseminations, quartz-bearing veins and flat reefs, which are hosted by folded and slightly metamorphosed Paleozoic sediments on both sides of a major thrust zone. It is demonstrated that these various Au-As ore types have similar lead-isotope compositions (206Pb/204Pb = 18.22–18.56), which are characteristic of Hercynian ore deposits in the southern Massif Central. The Lower Cambrian to Devonian host rocks and associated Pb-Zn-Ba occurrences display distinctly less radiogenic corrected isotopic signatures (206Pb/204Pb = 17.83–17.98), which are characteristic of Cambrian lead in the Montagne-Noire. Concerning the controversial origin of the Salsigne gold mineralization, these results disagree with the former syngenetic hypothesis and support a new model of Hercynian syntectonic gold concentration.This work was supported by BRGM'S scientific program: Le gisement de Salsigne: caractérisation du modèle et évaluation du potentiel aurifère du district![rdquo](/content/v167w3v53225805k/xxlarge8221.gif) |
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