@article{10272/7978,
year = {2009},
url = {http://hdl.handle.net/10272/7978},
abstract = {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},
title = {Los depósitos de Mn-Al-Fe de la cueva de Lazalday (Zarate, Alava): composición química y mineralogía},
title = {Mn-Al-Fe deposists of Lazalday cave (Zarate, Alava): chemical composition and mineralogy},
author = {Yusta, Iñaki and Castellano, Amaia and Aranburu Artano, Arantza and Velasco, Francisco},
}