Abstract
Preceeding the main Hercynian Au-As-Sb metallogenic hydrothermal event, metallic preconcentrations (Au, Sb, Pb) occurred during the sedimentation of the Paleozoic, namely in the Precambrian (?) and/or Cambrian layers bearing volcanic prints, in the volcano-sedimentary lower Ordovician and in the basal Carboniferous breccia. The most evident lithostratigraphic control in the Dúrico-Beirêo mining district concerns the Au-As mineralization hosted by the Arenigian alternances along the Eastern limb of the Valongo Anticline, with important syn-diagenetic concentration of gold related to exhalative “black-layer”, with pyrite-arsenopyrite. Lithostratigraphic controls are not so evident for the Sb-Au mineralizations that occur west of the Western limb of the Valongo Anticline. Nevertheless, all the studied deposits are hosted by competent sequences, mainly conglomerates, arenites and pelites from the Precambrian (?) and/or Cambrian (Montalto Unit) with acid volcanic rocks intercalated in the base, and in some cases by the Carboniferous basal breccia (paleo-placertype).
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References
Combes A, Cassard D, Couto H, Damião J, Ferraz P, Urien P (1992) Caractérisation structurale des minéralisations aurifères de ľArénigien dans la région de Valongo (Portugal). Chronique de la Recherche Minière 509: 3–15
Couto H (1993) As Mineralizações de Sb-Au da região Dúrico-Beirã. Ph.D. thesis, Univ. of Porto, Vol. 2, 606
Couto H, Roger G, Moëlo Y, Bril H (1990) Le district_à antimoine-or Dúrico-Beirão (Portugal):_évolution paragénétique et géochimique; implications métallogén-iques. Mineralium Deposita 25: 69–81
Couto H, Roger G, Moëlo Y, Borges FS (2003) Mina das Banjas: controlo das mineralizações auríferas pelas alternâncias do Arenigiano. Ciê da Terra (UNL), Lisboa, no esp. V, CD-ROM, F25–F28
Couto H, Borgers FS, Roger G, Gutiérrez-Marco JC (2004) The Ordovician of Valongo Anticline (Portugal). Erlanger Geologische Abhanlungen-Sonderband 5. International Symposium on Early Palaegeography and Palaeoclimate. Abstract 28
Kirk J, Ruiz J, Chesley J, Titley S, Walshe J (2001) Detrital model for the origin of gold and sulfides in the Witwatersrand basin based on Re-Os isotopex. abs. Geol. Soc. Am. Abstr. Programs 32 (7): A–79
Leca X (1985) La découverte des amas sulfurés cachés de Neves-Corvo (Sud du Portugal). Essai de méthodologie, Chronique de la Recherche Minière 479: 51–62
Pasava J, Kribek B, Dobes P, Vavrin I, Zà K, Delian F, Tao Z, Boiron MC (2003) Tin-polymetallic sulfide deposits in the eastern part of the Dachangtin field (South China) and the role of black shales in their origin. Mineralium Deposita 38: 39–66
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Couto, H., Borges, F.S. (2005). Stratiform Sb and Au mineralizations in the Hercynian Dúrico-Beirã area (North Portugal). In: Mao, J., Bierlein, F.P. (eds) Mineral Deposit Research: Meeting the Global Challenge. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-27946-6_25
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