40ar/39ar Dating of alunite from the Pueblo Viejo Gold-Silver District, Dominican Republic

Arribas Moreno, Antonio; Arribas Rosado, Isabel Pilar; Draper, Grenville; Hall, Chris; Kesler, Sthepen E.; McEgan, Craig y Muntean, John L. (2011). 40ar/39ar Dating of alunite from the Pueblo Viejo Gold-Silver District, Dominican Republic. "Economic Geology", v. 106 (n. 6); pp. 1059-1070. ISSN 0361-0128. https://doi.org/10.2113/econgeo.106.6.1059.

Descripción

Título: 40ar/39ar Dating of alunite from the Pueblo Viejo Gold-Silver District, Dominican Republic
Autor/es:
  • Arribas Moreno, Antonio
  • Arribas Rosado, Isabel Pilar
  • Draper, Grenville
  • Hall, Chris
  • Kesler, Sthepen E.
  • McEgan, Craig
  • Muntean, John L.
Tipo de Documento: Artículo
Título de Revista/Publicación: Economic Geology
Fecha: 2011
Volumen: 106
Materias:
Escuela: E.T.S.I. Minas (UPM) [antigua denominación]
Departamento: Ingeniería Geológica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

New 40Ar/39Ar ages for alunite from the Moore and Monte Negro deposits in the Pueblo Viejo district, as well as from a newly discovered alunite-bearing zone on Loma la Cuaba west of the known deposits, are reported here. The ages range from about 80 to 40 Ma, with closely adjacent samples exhibiting very different ages. Interpretation of these results in the context of estimated closure temperatures for alunite and the geologic and tectonic evolution of Hispaniola does not lead to a simple conclusion about the age of mineralization. The simplest interpretation, that mineralization was caused by a buried Late Cretaceous (~80 Ma) intrusion, is complicated by lack of intrusions of this age in the area and absence of alteration in overlying limestone. The alternative interpretation, that mineralization was formed during Early Cretaceous (~110 Ma) magmatism and that the 40Ar/39Ar ages were completely reset by Late Cretaceous thrusting, is complicated by a lack of information on the timing and thermal effects of thrusting in central Hispaniola. Alunite studies have yielded similar unclear results in other pre-Cenozoic ore systems, notably those of the Lachlan fold belt in Australia

Más información

ID de Registro: 11273
Identificador DC: http://oa.upm.es/11273/
Identificador OAI: oai:oa.upm.es:11273
Identificador DOI: 10.2113/econgeo.106.6.1059
URL Oficial: http://economicgeology.org/content/106/6/1059.abstract
Depositado por: Memoria Investigacion
Depositado el: 02 Jul 2012 10:06
Ultima Modificación: 22 Sep 2014 10:49
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