Causes of complexity in a fallout dominated plinian eruption sequence: 312ka Fasnia Member, Diego Hernández Formation, Tenerife, Spain

C. J. Edgar, R. A.F. Cas, P. H. Olin, J.A. Wolff, J. Martí, J.M. Simmons

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The 312ka Fasnia eruption from the Las Cañadas Caldera on Tenerife, Canary Islands, Spain, produced a complex sequence of twenty-two intercalated units, including 7 pumice fall, 7 ignimbrite and 8 ash surge and fall deposits that define two distinct eruption sequences (Lower and Upper Fasnia sequences). The fallout units themselves are internally complex, reflecting waxing and waning of the eruption column, while many of the ignimbrites reflect multiple intra-plinian partial column collapse events associated with the injection of lithic clasts into the eruption column. The Lower and Upper Fasnia eruption phases were each terminated by caldera collapse and complete column collapse events. Probable blockage of the conduit and vent system during Lower Fasnia caldera collapse event briefly terminated the eruption, resulting in a short-lived period of erosion and sedimentation prior to the onset of the Upper Fasnia phase. The transition to the Upper Fasnia eruption phase coincided with the eruption of more geochemically homogeneous pyroclasts. In total, 62km3 of tephra were erupted, including 49km3 of juvenile clasts and >12km3 of lithic clasts. The DRE volume of magma erupted was 13km3 (Lower Fasnia>5km3, Upper Fasnia>8km3), two thirds of which (~9-10km3) was deposited purely by fallout. The Fasnia Member is one of the most complex plinian sequences known.

Original languageEnglish
Pages (from-to)21-45
Number of pages25
JournalJournal of Volcanology and Geothermal Research
Volume345
DOIs
Publication statusPublished - 1 Oct 2017

Cite this

@article{706147e3430649e796eab52126720152,
title = "Causes of complexity in a fallout dominated plinian eruption sequence: 312ka Fasnia Member, Diego Hern{\'a}ndez Formation, Tenerife, Spain",
abstract = "The 312ka Fasnia eruption from the Las Ca{\~n}adas Caldera on Tenerife, Canary Islands, Spain, produced a complex sequence of twenty-two intercalated units, including 7 pumice fall, 7 ignimbrite and 8 ash surge and fall deposits that define two distinct eruption sequences (Lower and Upper Fasnia sequences). The fallout units themselves are internally complex, reflecting waxing and waning of the eruption column, while many of the ignimbrites reflect multiple intra-plinian partial column collapse events associated with the injection of lithic clasts into the eruption column. The Lower and Upper Fasnia eruption phases were each terminated by caldera collapse and complete column collapse events. Probable blockage of the conduit and vent system during Lower Fasnia caldera collapse event briefly terminated the eruption, resulting in a short-lived period of erosion and sedimentation prior to the onset of the Upper Fasnia phase. The transition to the Upper Fasnia eruption phase coincided with the eruption of more geochemically homogeneous pyroclasts. In total, 62km3 of tephra were erupted, including 49km3 of juvenile clasts and >12km3 of lithic clasts. The DRE volume of magma erupted was 13km3 (Lower Fasnia>5km3, Upper Fasnia>8km3), two thirds of which (~9-10km3) was deposited purely by fallout. The Fasnia Member is one of the most complex plinian sequences known.",
author = "Edgar, {C. J.} and Cas, {R. A.F.} and Olin, {P. H.} and J.A. Wolff and J. Mart{\'i} and J.M. Simmons",
year = "2017",
month = "10",
day = "1",
doi = "10.1016/j.jvolgeores.2017.07.008",
language = "English",
volume = "345",
pages = "21--45",
journal = "Journal of Volcanology and Geothermal Research",
issn = "0377-0273",
publisher = "Elsevier",

}

Causes of complexity in a fallout dominated plinian eruption sequence : 312ka Fasnia Member, Diego Hernández Formation, Tenerife, Spain. / Edgar, C. J.; Cas, R. A.F.; Olin, P. H.; Wolff, J.A.; Martí, J.; Simmons, J.M.

In: Journal of Volcanology and Geothermal Research, Vol. 345, 01.10.2017, p. 21-45.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Causes of complexity in a fallout dominated plinian eruption sequence

T2 - 312ka Fasnia Member, Diego Hernández Formation, Tenerife, Spain

AU - Edgar, C. J.

AU - Cas, R. A.F.

AU - Olin, P. H.

AU - Wolff, J.A.

AU - Martí, J.

AU - Simmons, J.M.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - The 312ka Fasnia eruption from the Las Cañadas Caldera on Tenerife, Canary Islands, Spain, produced a complex sequence of twenty-two intercalated units, including 7 pumice fall, 7 ignimbrite and 8 ash surge and fall deposits that define two distinct eruption sequences (Lower and Upper Fasnia sequences). The fallout units themselves are internally complex, reflecting waxing and waning of the eruption column, while many of the ignimbrites reflect multiple intra-plinian partial column collapse events associated with the injection of lithic clasts into the eruption column. The Lower and Upper Fasnia eruption phases were each terminated by caldera collapse and complete column collapse events. Probable blockage of the conduit and vent system during Lower Fasnia caldera collapse event briefly terminated the eruption, resulting in a short-lived period of erosion and sedimentation prior to the onset of the Upper Fasnia phase. The transition to the Upper Fasnia eruption phase coincided with the eruption of more geochemically homogeneous pyroclasts. In total, 62km3 of tephra were erupted, including 49km3 of juvenile clasts and >12km3 of lithic clasts. The DRE volume of magma erupted was 13km3 (Lower Fasnia>5km3, Upper Fasnia>8km3), two thirds of which (~9-10km3) was deposited purely by fallout. The Fasnia Member is one of the most complex plinian sequences known.

AB - The 312ka Fasnia eruption from the Las Cañadas Caldera on Tenerife, Canary Islands, Spain, produced a complex sequence of twenty-two intercalated units, including 7 pumice fall, 7 ignimbrite and 8 ash surge and fall deposits that define two distinct eruption sequences (Lower and Upper Fasnia sequences). The fallout units themselves are internally complex, reflecting waxing and waning of the eruption column, while many of the ignimbrites reflect multiple intra-plinian partial column collapse events associated with the injection of lithic clasts into the eruption column. The Lower and Upper Fasnia eruption phases were each terminated by caldera collapse and complete column collapse events. Probable blockage of the conduit and vent system during Lower Fasnia caldera collapse event briefly terminated the eruption, resulting in a short-lived period of erosion and sedimentation prior to the onset of the Upper Fasnia phase. The transition to the Upper Fasnia eruption phase coincided with the eruption of more geochemically homogeneous pyroclasts. In total, 62km3 of tephra were erupted, including 49km3 of juvenile clasts and >12km3 of lithic clasts. The DRE volume of magma erupted was 13km3 (Lower Fasnia>5km3, Upper Fasnia>8km3), two thirds of which (~9-10km3) was deposited purely by fallout. The Fasnia Member is one of the most complex plinian sequences known.

UR - http://www.scopus.com/inward/record.url?scp=85026738806&partnerID=8YFLogxK

U2 - 10.1016/j.jvolgeores.2017.07.008

DO - 10.1016/j.jvolgeores.2017.07.008

M3 - Article

VL - 345

SP - 21

EP - 45

JO - Journal of Volcanology and Geothermal Research

JF - Journal of Volcanology and Geothermal Research

SN - 0377-0273

ER -