Large-scale, massive burial dolomitization affected Upper Carboniferous carbonates of the southwestern Variscan Cantabrian Zone (Spain). Replacive and void-filling dolomites formed and were post-dated by calcite cementation. The process of dolomitization was due to the circulation of hypersaline and hydrothermal marine-derived brines, controlled by rock anisotropies. The dolomites probably formed in Early Permian time during post-thrusting orocline formation in an extensional setting. Lithospheric delamination induced increased heat flow and allowed thermal convection of the fluids. The dolomites from the Cantabrian Zone are excellently exposed and represent an interesting outcrop analogue for hydrocarbon reservoirs elsewhere. In comparable geotectonic settings of the European Variscan Orogen large masses of similar dolomites could have formed if Mg-rich brines were available.

Massive hydrothermal dolomites in the southwestern Cantabrian Zone (Spain) and their relation to the Late Variscan evolution / M. Gasparrini, T. Bechstadt, M. Boni. - In: MARINE AND PETROLEUM GEOLOGY. - ISSN 0264-8172. - 23:5(2006), pp. 543-568.

Massive hydrothermal dolomites in the southwestern Cantabrian Zone (Spain) and their relation to the Late Variscan evolution

M. Gasparrini
Primo
Writing – Original Draft Preparation
;
2006

Abstract

Large-scale, massive burial dolomitization affected Upper Carboniferous carbonates of the southwestern Variscan Cantabrian Zone (Spain). Replacive and void-filling dolomites formed and were post-dated by calcite cementation. The process of dolomitization was due to the circulation of hypersaline and hydrothermal marine-derived brines, controlled by rock anisotropies. The dolomites probably formed in Early Permian time during post-thrusting orocline formation in an extensional setting. Lithospheric delamination induced increased heat flow and allowed thermal convection of the fluids. The dolomites from the Cantabrian Zone are excellently exposed and represent an interesting outcrop analogue for hydrocarbon reservoirs elsewhere. In comparable geotectonic settings of the European Variscan Orogen large masses of similar dolomites could have formed if Mg-rich brines were available.
Hydrothermal dolomites; Cantabrian zone; Variscan orogeny
Settore GEO/02 - Geologia Stratigrafica e Sedimentologica
2006
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/722955
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