RT info:eu-repo/semantics/bookPart
T1 Insights into speleothems from lava tubes of the Galapagos Islands (Ecuador): mineralogy and biogenecity
A1 Daza, Raquel
A1 Gázquez, Fernando
A1 Miller, Ana Zelia
A1 Sáiz Jiménez, Cesáreo
A1 Calaforra, José María
A1 Forti, Paolo
A1 Rull Pérez, Fernando
A1 Medina García, Jesús
A1 Sanz Arranz, Aurelio
A1 Martínez Frías, Jesús
A1 Toulkeridis, Theofilos
AB Different types of hard and soft speleothems(stalactites, stalagmites, columns, crusts, flowstones,micro-gours and botryoidal coralloids) have beenobserved throughout lava tubes in the Galapagosarchipelago, Ecuador. Three lava tubes were studied inthis work: Gallardo and Royal Palm volcanic caves(Santa Cruz Island) and Sucre Cave (Isabela Island).The studied speleothems were mainly formed by opal,calcite and clay minerals, including plagioclase andpyroxenes from the basaltic host rock. Rarely, ironoxides, gypsum were found in some speleothems,which were interpreted as alteration products of theprimary volcanic materials. Field emission scanningelectron microscopy revealed abundant filamentous17th International Vulcanspeleology Symposium 2bacteria, and reticulated filaments similar to thoserecently observed in others lava tubes around the world.These filaments are associated with EPS and mineraldeposits rich in Si, Ca or Fe. The identified mineralsand the evidence of biosignatures suggest a biologicalcontribution to speleothem development withinGallardo, Royal Palm and Sucre lava tubes.
YR 2016
FD 2016
LK http://uvadoc.uva.es/handle/10324/22997
UL http://uvadoc.uva.es/handle/10324/22997
LA eng
NO 17th International Vulcanspeleology Symposium
DS UVaDOC
RD 18-nov-2024