2024-03-29T08:08:16Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/229972021-06-23T10:20:31Zcom_10324_1158com_10324_931com_10324_894col_10324_1243
00925njm 22002777a 4500
dc
Daza, Raquel
author
Gázquez, Fernando
author
Miller, Ana Zelia
author
Sáiz Jiménez, Cesáreo
author
Calaforra, José María
author
Forti, Paolo
author
Rull Pérez, Fernando
author
Medina García, Jesús
author
Sanz Arranz, Aurelio
author
Martínez Frías, Jesús
author
Toulkeridis, Theofilos
author
2016
Different types of hard and soft speleothems
(stalactites, stalagmites, columns, crusts, flowstones,
micro-gours and botryoidal coralloids) have been
observed throughout lava tubes in the Galapagos
archipelago, Ecuador. Three lava tubes were studied in
this 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 and
pyroxenes from the basaltic host rock. Rarely, iron
oxides, gypsum were found in some speleothems,
which were interpreted as alteration products of the
primary volcanic materials. Field emission scanning
electron microscopy revealed abundant filamentous
17th International Vulcanspeleology Symposium 2
bacteria, and reticulated filaments similar to those
recently observed in others lava tubes around the world.
These filaments are associated with EPS and mineral
deposits rich in Si, Ca or Fe. The identified minerals
and the evidence of biosignatures suggest a biological
contribution to speleothem development within
Gallardo, Royal Palm and Sucre lava tubes.
17th International Vulcanspeleology Symposium
http://uvadoc.uva.es/handle/10324/22997
Insights into speleothems from lava tubes of the Galapagos Islands (Ecuador): mineralogy and biogenecity