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Book Chapter

Interplay between fracturing and hydrothermal fluid flow in the Asón Valley hydrothermal dolomites (Basque–Cantabrian Basin, Spain)

By
E. Iriarte
E. Iriarte
Departamento Ciencias Históricas y Geografía, Laboratorio de Evolución Humana, Universidad de Burgos, Plaza de Misael Bañuelos s/n, Edificio I+D+i, 09001, Burgos, Spain
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M. A. López-Horgue
M. A. López-Horgue
Estratigrafia eta Paleontologia, Zientzia eta Teknologia Fakultatea, UPV/EHU University of the Basque Country, Sarriena z/g, 48940 Leioa, Basque Country, Spain
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S. Schroeder
S. Schroeder
Total Exploration & Production, Carbonate Sedimentology Group CSTJF, Avenue Larribau, 64018 Pau Cedex, France
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B. Caline
B. Caline
Total Exploration & Production, Carbonate Sedimentology Group CSTJF, Avenue Larribau, 64018 Pau Cedex, France
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Published:
January 01, 2012

Abstract

In Asón Valley hydrothermal dolomite area (Basque–Cantabrian Basin, northern Spain), an overlapping stepover area between two major basement faults, the Cabuerniga and Ruahermosa transtensional faults, was the location for different scales and types of extensive fractures. This fracture mesh affected the Albian Ranero limestone and was formed in a dilational jog, a regional fluid throughflow area. It acted as pathway for overpressured fluids that controlled the dolomite mineralization in the Ranero massif area. The study of synchronous structural features, fluid flow channelling and dolomitization processes indicated their tectonic control. The fluid circulated and concentrated preferentially in more fractured areas with increased permeability, such as extensional chimneys, creating dolomite bodies. Repeated extensive tectonic activity enhanced fracture porosity, promoting overpressured fluid migration and cyclical dolomitization events. The studied fracture pattern suggests the presence of sinistral transtension during the formation of extensional joint-sets that channellized the mineralizing fluid-flow. A gradation in structural features and dolomite facies and textures is visible from the main Pozalagua fault dolomite body to peripheral dolomite bodies as the Breccia body and Ranero megajoints. These differences could reflect a proximal–distal trend from the main fluid-flow area along the Pozalagua fault to the Ranero megajoints.

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Contents

Geological Society, London, Special Publications

Advances in Carbonate Exploration and Reservoir Analysis

J. Garland
J. Garland
Cambridge Carbonates Ltd, UK
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J. E. Neilson
J. E. Neilson
University of Aberdeen, UK
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S. E. Laubach
S. E. Laubach
University of Texas at Austin, USA
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K. J. Whidden
K. J. Whidden
USGS, USA
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Geological Society of London
Volume
370
ISBN electronic:
9781862396180
Publication date:
January 01, 2012

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