Mineralogy and geochemistry of the Masa Valverde blind massive sulphide deposit, Iberian Pyrite Belt (Spain)

Ruíz García, Casilda and Arribas Moreno, Antonio (2002). Mineralogy and geochemistry of the Masa Valverde blind massive sulphide deposit, Iberian Pyrite Belt (Spain). "Ore Geology Reviews", v. 19 (n. 1-2); pp. 1-22. ISSN 0169-1368. https://doi.org/10.1016/S0169-1368(01)00037-3.

Description

Title: Mineralogy and geochemistry of the Masa Valverde blind massive sulphide deposit, Iberian Pyrite Belt (Spain)
Author/s:
  • Ruíz García, Casilda
  • Arribas Moreno, Antonio
Item Type: Article
Título de Revista/Publicación: Ore Geology Reviews
Date: January 2002
ISSN: 0169-1368
Volume: 19
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería Geológica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Masa Valverde is a blind, volcanic-hosted massive sulphide deposit recently discovered in the Spanish sector of the Iberian Pyrite Belt (IPB). The deposit is more than 1 km long and is located at depths between 400 and 850 m, in direct spatial association with a residual gravimetric anomaly. The ore body is concealed beneath Culm sedimentary rocks which cover the westem extension of a Hercynian age anticline, a few kilometers west of an area where older massive sulphide workings existed. The Masa Valverde deposit consists of two main ore bodies composed dominantly of massive and banded pyrite which are hosted by a volcano-sedimentary sequence made up of felsic tuffs interlayered with shale, siliceous exhalite and radiolarian chert. The abundance of sedimentary host rocks to the deposit is a feature shared by other large massive sulphide deposits in the eastem sector of the IPB and is interpreted as significant with respect to the origin of the deposit (a break in volcanic activity). The thickness of the upper massive sulphide orebody varies between a few meters and 70 m, and it consists of lenses and blankets of massive sulphides with interbedded tuff and shale and occasionally stockwork zones. The lower orebody is smaller and thinner than the upper one, but this may be due to incomplete drilling. Two types of stockwork occur beneath the massive sulphide bodies, the more common type consists of irregular and anastomosing sulphide veinlets and irregular blebs formed by replacement. Stockwork with cross-cutting, generally straight-sided, sulphide veins is, by contrast, suggestive of formation by hydraulic fracturing. The mineralogy and alteration processes of the ore and host rocks at Masa Valverde are analogous to those of other IPB massive sulphides.

More information

Item ID: 4913
DC Identifier: http://oa.upm.es/4913/
OAI Identifier: oai:oa.upm.es:4913
DOI: 10.1016/S0169-1368(01)00037-3
Official URL: http://www.sciencedirect.com/science/journal/01691368
Deposited by: Biblioteca ETSI Minas y Energía
Deposited on: 11 Nov 2010 09:37
Last Modified: 20 Apr 2016 13:56
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