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Analysis of the fractal clustering of ore deposits in the Spanish Iberian Pyrite Belt

Analysis of the fractal clustering of ore deposits in the Spanish Iberian Pyrite Belt
Analysis of the fractal clustering of ore deposits in the Spanish Iberian Pyrite Belt
The Iberian Pyrite Belt (IPB) contains one of the greatest known concentrations of volcanic-hosted massive sulfides (VHMS) on Earth. Investigation of the spatial attributes of the mineralization using fractal methods, over a range of scales, and integrated within a GIS provides new information, of potential import to the exploration of VHMS deposits. At the mine-scale, stockworks, which act as feeders for hydrothermal fluids, show vein thickness distributions that are power-law (Dt ? 0.65 in one dimension) at length scales from about 10?2 to 102 m. Box-counting of veins indicates a capacity dimension (Dc) in the range of 1.60–1.65 in two dimensions, which is consistent with the vein thickness data. At larger scales, in the range 103 to 105 m, the distribution of mines and mineral prospects can be modelled as a fractal dust. When all the known mineral deposits and prospects are analyzed they have a capacity dimension Dc ? 1.3. The VHMS deposits alone have a capacity dimension Dc ? 0.9, indicating that they are clustered, with some indication that the ‘world-class’ deposits may be even more clustered. The different fractal analyses are integrated with information from geological and geophysical maps using a GIS. The distribution of prospects has been simulated using a simple multifractal model of the ore concentration and is constrained by known geological controls. Such a model has been implemented through the GIS
fractal, multifractal, mineral exploration, stockwork, iberian pyrite belt
0169-1368
307-318
Gumiel, P.
d8b4a65d-b701-4bf0-9d94-7a3c016ed8ef
Sanderson, D.J.
5653bc11-b905-4985-8c16-c655b2170ba9
Arias, M.
9a1a3a03-0ec2-4380-b7bd-ee7b69f314bc
Roberts, S.
f095c7ab-a37b-4064-8a41-ae4820832856
Martín-Izard, A.
e0241ff8-bb75-4b6f-9d99-bb9e9a367365
Gumiel, P.
d8b4a65d-b701-4bf0-9d94-7a3c016ed8ef
Sanderson, D.J.
5653bc11-b905-4985-8c16-c655b2170ba9
Arias, M.
9a1a3a03-0ec2-4380-b7bd-ee7b69f314bc
Roberts, S.
f095c7ab-a37b-4064-8a41-ae4820832856
Martín-Izard, A.
e0241ff8-bb75-4b6f-9d99-bb9e9a367365

Gumiel, P., Sanderson, D.J., Arias, M., Roberts, S. and Martín-Izard, A. (2010) Analysis of the fractal clustering of ore deposits in the Spanish Iberian Pyrite Belt. Ore Geology Reviews, 38 (4), 307-318. (doi:10.1016/j.oregeorev.2010.08.001).

Record type: Article

Abstract

The Iberian Pyrite Belt (IPB) contains one of the greatest known concentrations of volcanic-hosted massive sulfides (VHMS) on Earth. Investigation of the spatial attributes of the mineralization using fractal methods, over a range of scales, and integrated within a GIS provides new information, of potential import to the exploration of VHMS deposits. At the mine-scale, stockworks, which act as feeders for hydrothermal fluids, show vein thickness distributions that are power-law (Dt ? 0.65 in one dimension) at length scales from about 10?2 to 102 m. Box-counting of veins indicates a capacity dimension (Dc) in the range of 1.60–1.65 in two dimensions, which is consistent with the vein thickness data. At larger scales, in the range 103 to 105 m, the distribution of mines and mineral prospects can be modelled as a fractal dust. When all the known mineral deposits and prospects are analyzed they have a capacity dimension Dc ? 1.3. The VHMS deposits alone have a capacity dimension Dc ? 0.9, indicating that they are clustered, with some indication that the ‘world-class’ deposits may be even more clustered. The different fractal analyses are integrated with information from geological and geophysical maps using a GIS. The distribution of prospects has been simulated using a simple multifractal model of the ore concentration and is constrained by known geological controls. Such a model has been implemented through the GIS

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Published date: December 2010
Keywords: fractal, multifractal, mineral exploration, stockwork, iberian pyrite belt
Organisations: Ocean and Earth Science, Engineering Science Unit, Civil Engineering & the Environment

Identifiers

Local EPrints ID: 74292
URI: http://eprints.soton.ac.uk/id/eprint/74292
ISSN: 0169-1368
PURE UUID: 5bc22dd3-6f34-4dc6-a2e2-54c2d3a34a8a
ORCID for D.J. Sanderson: ORCID iD orcid.org/0000-0002-2144-3527
ORCID for S. Roberts: ORCID iD orcid.org/0000-0003-4755-6703

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Date deposited: 11 Mar 2010
Last modified: 26 Nov 2019 02:06

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Contributors

Author: P. Gumiel
Author: D.J. Sanderson ORCID iD
Author: M. Arias
Author: S. Roberts ORCID iD
Author: A. Martín-Izard

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