Publication: Origen y diagénesis de los espeleotemas de Cueva Masero,
Monumento Natural Cuevas de Fuentes de León, Badajoz
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Publication Date
2018
Authors
Alonso-Zarza, Ana María
Martín Pérez, Andrea
Olmeda Zafrilla, Paula
Fernández Amo, Francisco J.
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Sociedad Geológica de España
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Abstract
Las cuevas que forman el Monumento Natural Cuevas de Fuentes de León se desarrollaron en una sucesión cámbrica detrítico-carbonática, que incluye algunas dolomías. Cueva Masero es una de las de mayor tamaño y contiene una amplia variedad de espeleotemas compuestos de calcita, aragonito y en menor proporción hidromagnesita formando el moonmilk. Las texturas de los espeleotemas son: 1) primarias, como las fibras de aragonito, las placas de calcita y el moonmilk; 2) diagenéticas, como los mosaicos y los megacristales de calcita o 3) de los dos tipos como la micrita y las columnas. La formación de aragonito e hidromagnesita en la cueva está condicionada por la presencia de Mg en las aguas de infiltración, por disolución de las dolomías. Los cambios en la composición del agua controlados climáticamente y la composición aragonítica inicial de algunos espeleotemas han dado lugar a procesos diagenéticos como transformación aragonito-calcita, micritización, cementación y recristalización. Nuestro estudio revela el interés de este Monumento Natural debido a la variedad y complejidad de sus espeleotemas.
The caves of the Natural Monument Cuevas de Fuentes de León developed within mixed detrital-carbonate formations of Cambrian age, containing some dolostones. One of the larger caves of the Monument, Cueva Masero, contains a wide variety of speleothems composed mainly by calcite but also aragonite and some hydromagnesite forming the moonmilk. The speleothem textures are: 1) primary, such as the aragonite fibres, calcite rafts and moonmilk; 2) diagenetic, calcite mosaics and megacrystals, or 3) both: columns and micrite. Dissolution of dolostones from the host rock provides Mg in the infiltration waters, which controls the presence of aragonite and hydromagnesite in the cave. Changes in water composition controlled by climatic changes and the primary aragonite composition of some speleothems drove a variety of diagenetic processes such as aragonite-calcite transformation, micritization, cementation and recrystallization. Our study has shown the interest of this Natural Monument due to the variety of speleothems and the complexity of the processes involved in its diagenesis.
The caves of the Natural Monument Cuevas de Fuentes de León developed within mixed detrital-carbonate formations of Cambrian age, containing some dolostones. One of the larger caves of the Monument, Cueva Masero, contains a wide variety of speleothems composed mainly by calcite but also aragonite and some hydromagnesite forming the moonmilk. The speleothem textures are: 1) primary, such as the aragonite fibres, calcite rafts and moonmilk; 2) diagenetic, calcite mosaics and megacrystals, or 3) both: columns and micrite. Dissolution of dolostones from the host rock provides Mg in the infiltration waters, which controls the presence of aragonite and hydromagnesite in the cave. Changes in water composition controlled by climatic changes and the primary aragonite composition of some speleothems drove a variety of diagenetic processes such as aragonite-calcite transformation, micritization, cementation and recrystallization. Our study has shown the interest of this Natural Monument due to the variety of speleothems and the complexity of the processes involved in its diagenesis.