| Título: | Dolomite in caves: Recent dolomite formation in oxic, non-sulfate environments. Castañar Cave, Spain |
| Autores: | Alonso-Zarza, Ana María ; Martín Pérez, Andrea |
| Tipo de documento: | texto impreso |
| Editorial: | Elsevier, 2008 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
Dolomite is a common mineral in the rock record but rare in recent superficial environments. Where it does occur, it is related to anoxic, sulfate-rich environments and microbial activity. The occurrence of some dolomite deposits in caves, however, indicates that dolomite formation is also possible in oxic, non-sulfate settings. Dolomite is forming at 17 °C and in oxic-vadose conditions on the host rocks and aragonite speleothems of the Castañar Cave, Cáceres, Spain. It appears as spheroids and dumbbells 50–300 ?m in diameter that internally consist of micron-sized rhombic to rounded crystals. Initially this dolomite is Carich, non-stoichiometric and poorly ordered. Mg-rich solutions allow the precipitation of metastable Mg-rich carbonates, such as huntite. This soon transforms into this Ca-rich dolomite, which later “ages” to form a more stoichiometric dolomite. These dolomites show similarities to those grown under anoxic, sulfate-rich conditions and their presence in caves provides a different setting that may contribute to the understanding of the “dolomite problem”, including their initial formation and later recrystallization processes. |
| En línea: | https://eprints.ucm.es/id/eprint/10005/1/DolomitaSedGeol.pdf |
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