RT Journal Article
T1 Etapas de formación de dolomías masivas del entorno de La Florida-El Soplao, Cantabria
T1 Stage of regional dolomitization in La Florida-El Soplao area, Cantabria
A1 López Cilla, Ignacio
A1 Rosales, Idoia
A1 Najarro, María
A1 Martín Chivelet, Javier
A1 Velasco, Francisco
A1 Tornos, Fernando
AB Dolomitization played a very important role in producing porosity within the Late Aptian shallow marine carbonateshosting the El Soplao Cave and La Forida mine deposit. A detailed petrographic study of samples from a stratigraphicsection across these limestones and dolostones has revealed three diagenetic stages from shallow to late burial andfinally uplift. During these stages, at least four phases of calcite cementation (C1 to C4) and five phases of dolomiteformation and recrystallization (D1 to D5) took place. The timing of dolomitization is still uncertain, but the first phase(D1) occurred shortly after limestone deposition (shallow burial diagenesis) as cement filling primary and earlysecondary (mouldic) porosity. Calcite cements C1 and C2 occurred also in this diagenetic stage. Later, pervasivereplacement dolomitization (D2, idiotopic) and dolomite recrystallization (D3, xenotopic) took place in the burialrealm. Saddle dolomite (D4) occurred in continuity with xenotopic dolomite D3 as pore-lining cement in vuggyporosity. Late-stage coarse saddle dolomites (D5) were precipitated as cement in fractures, hydrofractures andhydrothermal breccias cross-cutting the previous dolomite stages. Coarse blocky calcite cement (C3) fills the remainingpore space during latest burial diagenesis. Finally, dedolomitization, iron oxides and calcite C4, are observed indiscrete zones within dolomite crystals, and are related to uplift meteoric diagenesis and karst-related dissolution
YR 2009
FD 2009
LK http://hdl.handle.net/10272/7967
UL http://hdl.handle.net/10272/7967
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026