Los depósitos de Mn-Al-Fe de la cueva de Lazalday (Zarate, Alava): composición química y mineralogía
Lazalday Cave is a 4 km long karstic cave where Mn deposits occur as black thin coatings covering walls and cementing conglomerates, inside calcite speleothems, and also in the floor of many passages alternating with Al-Si white gels. Fe-rich deposits are found forming black stalactites and microgou...
| Autores: | , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2009 |
| País: | España |
| Recursos: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | español |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/7978 |
| Acesso em linha: | http://hdl.handle.net/10272/7978 |
| Access Level: | acceso abierto |
| Palavra-chave: | Cave Mn-Fe deposits Speleothems Mineralogy Metal enrichment |
| Resumo: | Lazalday Cave is a 4 km long karstic cave where Mn deposits occur as black thin coatings covering walls and cementing conglomerates, inside calcite speleothems, and also in the floor of many passages alternating with Al-Si white gels. Fe-rich deposits are found forming black stalactites and microgours. Asbolane, allophane, hydrated halloysite, goethite, ferrihydrite and X-ray amorphous phases compose respectively the Mn-Al and Fe deposits. High metal contents of 21.5% MnO, 5.1% Zn, 2.5% Ni, 0.9% Co, and 0.2% Cu were recorded in Mn-rich levels. Allophane and Fe deposits also trap heavy metals, but in lower proportions. The presence of abundant gypsum, hydrated halloysite and jarosite point out an acidic alteration from pyrite-bearing rocks. Potential metal source rocks are discussed |
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