Stratiform Sb and Au mineralizations in the Hercynian Durico-Beira area (North Portugal)

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2005

Autores

Helena Couto (Autor) FCUP; Frederico Sodre Borges (Autor) Outra

Ata de Conferência Internacional

Título: Mineral Deposit Research: Meeting the Global Challenge, Vols 1 and 2

Páginas: 97-99

8th Biennial SGA Meeting

Beijing, PEOPLES R CHINA, AUG 18-21, 2005

Indexação

ISI Web of Knowledge - 5 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

Outras Informações

ID Authenticus: P-000-694

DOI: 10.1007/3-540-27946-6_25

Abstract (EN): 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 Durico-Beirao 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-placer type).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 3