50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea
6 pages, 4 figures, supplemental material https://doi.org/10.1130/G51198.1
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Geological Society of America
2023-08
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dig-icm-es-10261-3411262023-12-21T10:02:11Z 50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea Sawyer, Derek E. Urgeles, Roger Lo Iacono, Claudio Ministerio de Ciencia e Innovación (España) Agencia Estatal de Investigación (España) National Science Foundation (US) 6 pages, 4 figures, supplemental material https://doi.org/10.1130/G51198.1 Megabeds are exceptionally large submarine deposits interpreted to originate from single catastrophic events. Megabeds are significant components of deep-water basins and are critical for understanding geohazards. We discovered a succession of four megabeds within the upper 70 m of the western Marsili Basin, Tyrrhenian Sea, deposited within the past 50 k.y. The megabeds were imaged as distinctive acoustically transparent units with ponded geometries, 10–25 m thick, separated by parallel-bedded strata. Cores from Site 650 of Ocean Drilling Program Leg 107 revealed that three of the four megabeds are made of alternating volcaniclastic sand and mud, and one is a volcaniclastic debris flow. Abundant shallow-water benthic foraminifera within the megabeds suggest that they were not sourced locally from the active Marsili Seamount, but most likely originated from the Campanian volcanic province to the north. The time interval during which the megabeds were deposited includes the 39.8 ka Campanian ignimbrite supereruption of the Campi Flegrei caldera, Italy, which is among the largest known eruptions on Earth, and the 14.9 ka Neapolitan Yellow Tuff supereruption. Volume (minimum) estimates range from 1.3 to 13.3 km3. However, similar megabeds observed in the neighboring Vavilov Basin to the west suggest that the megabeds in both basins may be correlative, and thus volumes could be much larger. The newly discovered megabeds of the Marsili Basin reveal significant geohazard events for the circum–Tyrrhenian Sea coastlines with a recurrence interval on the order of ~10–15 k.y This study was part of projects HADES and ICEFLAME (grants CTM2011-30400-C02-01-R and PID2020-114856RB-100) funded by the Ministerio de Ciencia e Innovation (MCIN)/Agencia Estatal de Investigación (AEI), https://doi.org/10.13039/501100011033. D.E. Sawyer was partially supported by National Science Foundation grant 1945543 With the institutional support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S) Peer reviewed 2023-12-21T10:02:11Z 2023-12-21T10:02:11Z 2023-08 artículo Geology 51(11): 1001-1006 (2023) 0091-7613 CEX2019-000928-S http://hdl.handle.net/10261/341126 10.1130/G51198.1 1943-2682 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-114856RB-I00/ES/IMPACTO DEL RETROCESO DEL CASQUETE GLACIAR Y CONTROLES GEOLOGICOS EN LA DINAMICA DE FLUJO DE FLUIDOS DEL MARGEN CONTINENTAL DE LA PENINSULA ANTARTICA/ Publisher's version https://doi.org/10.1130/G51198.1 Sí open Geological Society of America |
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6 pages, 4 figures, supplemental material https://doi.org/10.1130/G51198.1 |
| author2 |
Ministerio de Ciencia e Innovación (España) |
| author_facet |
Ministerio de Ciencia e Innovación (España) Sawyer, Derek E. Urgeles, Roger Lo Iacono, Claudio |
| format |
artículo |
| author |
Sawyer, Derek E. Urgeles, Roger Lo Iacono, Claudio |
| spellingShingle |
Sawyer, Derek E. Urgeles, Roger Lo Iacono, Claudio 50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea |
| author_sort |
Sawyer, Derek E. |
| title |
50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea |
| title_short |
50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea |
| title_full |
50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea |
| title_fullStr |
50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea |
| title_full_unstemmed |
50,000 yr of recurrent volcaniclastic megabed deposition in the Marsili Basin, Tyrrhenian Sea |
| title_sort |
50,000 yr of recurrent volcaniclastic megabed deposition in the marsili basin, tyrrhenian sea |
| publisher |
Geological Society of America |
| publishDate |
2023-08 |
| url |
http://hdl.handle.net/10261/341126 |
| work_keys_str_mv |
AT sawyerdereke 50000yrofrecurrentvolcaniclasticmegabeddepositioninthemarsilibasintyrrheniansea AT urgelesroger 50000yrofrecurrentvolcaniclasticmegabeddepositioninthemarsilibasintyrrheniansea AT loiaconoclaudio 50000yrofrecurrentvolcaniclasticmegabeddepositioninthemarsilibasintyrrheniansea |
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1787227012188864512 |