Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande
Comunicación oral presentada en el 1st European Meeting on Geomicrobiology of volcanic caves. días 2-3 de marzo de 2023 celebrado en la Casa de la Ciencia-CSIC de Sevilla
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CSIC - Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS)
2023-03
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| Online Access: | http://hdl.handle.net/10261/296531 |
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dig-irnas-es-10261-2965312023-03-03T07:36:48Z Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande Sauro, Francesco Massironi, M. Miller, A. Z. Portuguese Foundation for Science and Technology (FCT) Portuguese Institute for Nature Conservation and Forests Comunicación oral presentada en el 1st European Meeting on Geomicrobiology of volcanic caves. días 2-3 de marzo de 2023 celebrado en la Casa de la Ciencia-CSIC de Sevilla Caves in Selvagen Grande have been reported since more than a century ago, mainly because of their importance in nesting of Cory’s Seawater colonies. Before the Microceno project, only three long caves were known in the island: Furna do Inferno, Furna do Capitão Kidd and Furna do Risco. Considering the volcanic setting of the island with fonolitic and basaltic lava flows, their origin was initially attributed to lava tube genetic processes. The Microceno expedition performed a detailed study of the lithologies and speleogenetic morphologies, documenting additional 10 cavities and discovering also one new important cave, Furna do Sopro du Dragao. The main discovery is that none of these caves are related to volcanic processes. Instead, most of them are formed along sedimentary dikes constituted by bioclastic limestone belonging to Miocenic sedimentary phase intruding the fonolitic basal complex. Internal morphologies indicate that their formation could be related to flank margin speleogenetic processes, due to mixing of seawater with island aquifer along preferential fracture pathways crossing the dikes. To our notice, it is the first case described in the world of a diffuse speleogenesis due to water mixing-corrosion cycles along sedimentary dikes in a predominantly volcanic environment. This has interesting implications for potential karstic processes in volcanic environments on Mars where sedimentary dikes constituted by sulphates have been widely documented by satellite observations and ground rovers. The study was performed in the frame of the MICROCENO project (ref. TDC/CTAAMB/0608/2020) with support from the Portuguese Foundation for Science and Technology (FCT). Thanks to the Selvagens Islands Nature Reserve from the Portuguese Institute for Nature Conservation and Forests (IFCN IP-RAM) for the permission (License 1/20S) to conduct the research activities of the MICROCENO project in Selvagens Islands. No 2023-03-03T07:36:48Z 2023-03-03T07:36:48Z 2023-03 comunicación de congreso 1st European Meeting on Geomicrobiology of volcanic caves. Book of Abstract pág. 8 (2023) 978-84-09-48976-3 http://hdl.handle.net/10261/296531 en http://hdl.handle.net/10261/296261 Sí open CSIC - Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS) |
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Comunicación oral presentada en el 1st European Meeting on Geomicrobiology of volcanic caves. días 2-3 de marzo de 2023 celebrado en la Casa de la Ciencia-CSIC de Sevilla |
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Portuguese Foundation for Science and Technology (FCT) |
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Portuguese Foundation for Science and Technology (FCT) Sauro, Francesco Massironi, M. Miller, A. Z. |
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comunicación de congreso |
| author |
Sauro, Francesco Massironi, M. Miller, A. Z. |
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Sauro, Francesco Massironi, M. Miller, A. Z. Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande |
| author_sort |
Sauro, Francesco |
| title |
Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande |
| title_short |
Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande |
| title_full |
Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande |
| title_fullStr |
Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande |
| title_full_unstemmed |
Flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of Selvagen Grande |
| title_sort |
flank margin speleogenesis in carbonatic sedimentary dikes of a volcanic island: the caves of selvagen grande |
| publisher |
CSIC - Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS) |
| publishDate |
2023-03 |
| url |
http://hdl.handle.net/10261/296531 |
| work_keys_str_mv |
AT saurofrancesco flankmarginspeleogenesisincarbonaticsedimentarydikesofavolcanicislandthecavesofselvagengrande AT massironim flankmarginspeleogenesisincarbonaticsedimentarydikesofavolcanicislandthecavesofselvagengrande AT milleraz flankmarginspeleogenesisincarbonaticsedimentarydikesofavolcanicislandthecavesofselvagengrande |
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1777665159620198400 |