Zeolitization of tuffs at Quinamávida, central southern Chile
Bascuñan, Sophía (Universidad de Concepción. Instituto de Geología Económica Aplicada)
Kelm, Ursula (Universidad de Concepción. Instituto de Geología Económica Aplicada)
Sanhueza, Vilma (Universidad de Concepción. Instituto de Geología Económica Aplicada)
Alfaro, Guillermo (Universidad de Concepción. Instituto de Geología Económica Aplicada)

Fecha:	2007
Resumen:	Tuffs of the Tertiary Colbún Formation near Quinamávida in central southern Chile have been mapped and their mineralogy analyzed. The pyroclastic rocks present a maximum outcropping thickness of 120 m and are dominated by vitreous lapilli and minor lithic tuffs, the products of active volcanism nearby. About 10% of the tuffs consist of lenses of fine banded tuffs with a high leaf content that were deposited in shallow lakes during quiescent periods between periods of volcanic activity. This tuff sequence is pervasively transformed to clinoptilolite/heulandite and mordenite with variable amounts of plagioclase, minor quartz and smectite. Factors thought to have influenced this conversion to zeolites are a humid climate following deposition combined with a slightly elevated heat flow. Local hydrogeological conditions have modified the cation-hydrogen ion ratios across the study area favoring the formation of clinoptilolite/ heulandite and mordenite with medium-minor smectite in the center and south, and a more abundant presence of smectite in the north of the study area.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Chile ; Heulandite ; Clinoptilolite ; Mordenite ; Tuff ; Zeolite
Publicado en:	Clays and Clay Minerals, Vol. 55, Núm. 5 (2007) , p. 524-533, ISSN 1552-8367

DOI: 10.1346/CCMN.2007.0550507

10 p, 1.6 MB  Acceso restringido a la UAB

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