Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago)
Submerged marine terraces are relict coastal erosional landforms now underwater due to rising sea level and/or land subsidence. Using as case study the shelf around Santa Maria Island (North Atlantic Ocean), we intend to advance our knowledge on the formation and preservation of these features on re...
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Online Access: | http://hdl.handle.net/11585/659934 https://doi.org/10.1016/j.margeo.2018.09.002 http://www.sciencedirect.com/science/journal/00253227 |
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ftunibolognairis:oai:cris.unibo.it:11585/659934 2024-06-23T07:55:14+00:00 Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) Ricchi, Alessandro Quartau, Rui Ramalho, Ricardo S. Romagnoli, Claudia Casalbore, Daniele Ventura da Cruz, João Fradique, Catarina Vinhas, André Ricchi, Alessandro* Quartau, Rui Ramalho, Ricardo S. Romagnoli, Claudia Casalbore, Daniele Ventura da Cruz, João Fradique, Catarina Vinhas, André 2018 STAMPA http://hdl.handle.net/11585/659934 https://doi.org/10.1016/j.margeo.2018.09.002 http://www.sciencedirect.com/science/journal/00253227 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000449444300005 volume:406 firstpage:42 lastpage:56 numberofpages:15 journal:MARINE GEOLOGY http://hdl.handle.net/11585/659934 doi:10.1016/j.margeo.2018.09.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85053078039 http://www.sciencedirect.com/science/journal/00253227 info:eu-repo/semantics/openAccess Insular shelf Marine terrace Multibeam bathymetry Reefless volcanic island Uplift trend Oceanography Geology Geochemistry and Petrology info:eu-repo/semantics/article 2018 ftunibolognairis https://doi.org/10.1016/j.margeo.2018.09.002 2024-05-27T14:23:06Z Submerged marine terraces are relict coastal erosional landforms now underwater due to rising sea level and/or land subsidence. Using as case study the shelf around Santa Maria Island (North Atlantic Ocean), we intend to advance our knowledge on the formation and preservation of these features on reefless volcanic islands. Santa Maria is an ideal place to study their combined generation, since it displays a sequence of subaerial and submerged marine terraces (the latter not studied before), distributed between 7/230 m in elevation, and −40/−140 m in depth, respectively. Based on some geological constraints, we investigated a possible correlation between the formation of the different terraces with known sea-level changes. Our results suggest that the spatial distribution of marine terraces at Santa Maria depends on the complex interplay between glacio-eustatic sea-level fluctuations, the island's vertical motion trends, the morphology of the shelf, and the intensity of marine erosion. Subaerial terraces probably developed from ~3.5 Ma to ~1 Ma following a fortuitous conjugation of optimal exposure to energetic waves and a suitable arrangement/lithology of the stratigraphic units promoting easier erosion. Their preservation was likely promoted by the uplift trend the island experienced in the last 3.5 Ma, which was rapid enough to prevent their destruction by subsequent highstands. The submerged terraces, presumably all younger than ~1 Ma, were largely influenced by shelf gradient, leading to more developed and preserved terraces in wider and low-gradient sectors. Displacement by active faults also conditioned the formation and further development of both subaerial and submerged terraces, with tectonic activity documented for the 0.693 Ma–2.7 Ma period. Article in Journal/Newspaper North Atlantic IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Maria Island ENVELOPE(-55.914,-55.914,51.232,51.232) Marine Geology 406 42 56 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
Insular shelf Marine terrace Multibeam bathymetry Reefless volcanic island Uplift trend Oceanography Geology Geochemistry and Petrology |
spellingShingle |
Insular shelf Marine terrace Multibeam bathymetry Reefless volcanic island Uplift trend Oceanography Geology Geochemistry and Petrology Ricchi, Alessandro Quartau, Rui Ramalho, Ricardo S. Romagnoli, Claudia Casalbore, Daniele Ventura da Cruz, João Fradique, Catarina Vinhas, André Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) |
topic_facet |
Insular shelf Marine terrace Multibeam bathymetry Reefless volcanic island Uplift trend Oceanography Geology Geochemistry and Petrology |
description |
Submerged marine terraces are relict coastal erosional landforms now underwater due to rising sea level and/or land subsidence. Using as case study the shelf around Santa Maria Island (North Atlantic Ocean), we intend to advance our knowledge on the formation and preservation of these features on reefless volcanic islands. Santa Maria is an ideal place to study their combined generation, since it displays a sequence of subaerial and submerged marine terraces (the latter not studied before), distributed between 7/230 m in elevation, and −40/−140 m in depth, respectively. Based on some geological constraints, we investigated a possible correlation between the formation of the different terraces with known sea-level changes. Our results suggest that the spatial distribution of marine terraces at Santa Maria depends on the complex interplay between glacio-eustatic sea-level fluctuations, the island's vertical motion trends, the morphology of the shelf, and the intensity of marine erosion. Subaerial terraces probably developed from ~3.5 Ma to ~1 Ma following a fortuitous conjugation of optimal exposure to energetic waves and a suitable arrangement/lithology of the stratigraphic units promoting easier erosion. Their preservation was likely promoted by the uplift trend the island experienced in the last 3.5 Ma, which was rapid enough to prevent their destruction by subsequent highstands. The submerged terraces, presumably all younger than ~1 Ma, were largely influenced by shelf gradient, leading to more developed and preserved terraces in wider and low-gradient sectors. Displacement by active faults also conditioned the formation and further development of both subaerial and submerged terraces, with tectonic activity documented for the 0.693 Ma–2.7 Ma period. |
author2 |
Ricchi, Alessandro* Quartau, Rui Ramalho, Ricardo S. Romagnoli, Claudia Casalbore, Daniele Ventura da Cruz, João Fradique, Catarina Vinhas, André |
format |
Article in Journal/Newspaper |
author |
Ricchi, Alessandro Quartau, Rui Ramalho, Ricardo S. Romagnoli, Claudia Casalbore, Daniele Ventura da Cruz, João Fradique, Catarina Vinhas, André |
author_facet |
Ricchi, Alessandro Quartau, Rui Ramalho, Ricardo S. Romagnoli, Claudia Casalbore, Daniele Ventura da Cruz, João Fradique, Catarina Vinhas, André |
author_sort |
Ricchi, Alessandro |
title |
Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) |
title_short |
Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) |
title_full |
Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) |
title_fullStr |
Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) |
title_full_unstemmed |
Marine terrace development on reefless volcanic islands: New insights from high-resolution marine geophysical data offshore Santa Maria Island (Azores Archipelago) |
title_sort |
marine terrace development on reefless volcanic islands: new insights from high-resolution marine geophysical data offshore santa maria island (azores archipelago) |
publishDate |
2018 |
url |
http://hdl.handle.net/11585/659934 https://doi.org/10.1016/j.margeo.2018.09.002 http://www.sciencedirect.com/science/journal/00253227 |
long_lat |
ENVELOPE(-55.914,-55.914,51.232,51.232) |
geographic |
Maria Island |
geographic_facet |
Maria Island |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000449444300005 volume:406 firstpage:42 lastpage:56 numberofpages:15 journal:MARINE GEOLOGY http://hdl.handle.net/11585/659934 doi:10.1016/j.margeo.2018.09.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85053078039 http://www.sciencedirect.com/science/journal/00253227 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2018.09.002 |
container_title |
Marine Geology |
container_volume |
406 |
container_start_page |
42 |
op_container_end_page |
56 |
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1802647744296255488 |