Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

Eruptive dynamics of the 1060 CE rhyolitic eruption of Big Glass Mountain (BGM), USA, are investigated with field observations, hydrogen isotope and H2O content analysis of pyroclastic obsidian chips and lavas. Field relations at BGM reveal evidence for hybrid eruption, defined as synchronous explos...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Jonathan Castro, Sebastian C. Walter
Formato:	article
Lenguaje:	EN
Publicado:	Volcanica 2021
Materias:	obsidian big glass mountain degassing hybrid explosive-effusive eruption pyroclasts batched degassing hydrogen isotopes Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/d04aae3fc7ff4fac8350c538f955fa33
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:d04aae3fc7ff4fac8350c538f955fa33
record_format	dspace
spelling	oai:doaj.org-article:d04aae3fc7ff4fac8350c538f955fa332021-11-18T15:43:31ZHybrid rhyolitic eruption at Big Glass Mountain, CA, USA2610-354010.30909/vol.04.02.257277https://doaj.org/article/d04aae3fc7ff4fac8350c538f955fa332021-11-01T00:00:00Zhttps://www.jvolcanica.org/ojs/index.php/volcanica/article/view/121https://doaj.org/toc/2610-3540Eruptive dynamics of the 1060 CE rhyolitic eruption of Big Glass Mountain (BGM), USA, are investigated with field observations, hydrogen isotope and H2O content analysis of pyroclastic obsidian chips and lavas. Field relations at BGM reveal evidence for hybrid eruption, defined as synchronous explosive venting and effusive emplacement of vast obsidian lava flows. This activity is particularly well manifested by extensive breccia zones implanted within the BGM obsidian lavas, which may represent rafted tephra cones, in addition to remnants of airfall tephra on the lava. Rhyolitic obsidians collected from a 2.5-m-thick fall deposit and co-eruptive lava flow were studied by FTIR and TCEA methods to elucidate the eruption’s degassing history. The data, along with VolcDeGas program simulations, demonstrate a correlation between H2O content and H-isotopic composition (δD) that likely reflects ever-increasing amounts of volatile loss via repetitive close-system steps, best described as batched degassing.Jonathan CastroSebastian C. WalterVolcanicaarticleobsidianbig glass mountaindegassinghybrid explosive-effusive eruptionpyroclastsbatched degassinghydrogen isotopesGeologyQE1-996.5ENVolcanica, Vol 4, Iss 2, Pp 257-277 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	obsidian big glass mountain degassing hybrid explosive-effusive eruption pyroclasts batched degassing hydrogen isotopes Geology QE1-996.5
spellingShingle	obsidian big glass mountain degassing hybrid explosive-effusive eruption pyroclasts batched degassing hydrogen isotopes Geology QE1-996.5 Jonathan Castro Sebastian C. Walter Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA
description	Eruptive dynamics of the 1060 CE rhyolitic eruption of Big Glass Mountain (BGM), USA, are investigated with field observations, hydrogen isotope and H2O content analysis of pyroclastic obsidian chips and lavas. Field relations at BGM reveal evidence for hybrid eruption, defined as synchronous explosive venting and effusive emplacement of vast obsidian lava flows. This activity is particularly well manifested by extensive breccia zones implanted within the BGM obsidian lavas, which may represent rafted tephra cones, in addition to remnants of airfall tephra on the lava. Rhyolitic obsidians collected from a 2.5-m-thick fall deposit and co-eruptive lava flow were studied by FTIR and TCEA methods to elucidate the eruption’s degassing history. The data, along with VolcDeGas program simulations, demonstrate a correlation between H2O content and H-isotopic composition (δD) that likely reflects ever-increasing amounts of volatile loss via repetitive close-system steps, best described as batched degassing.
format	article
author	Jonathan Castro Sebastian C. Walter
author_facet	Jonathan Castro Sebastian C. Walter
author_sort	Jonathan Castro
title	Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA
title_short	Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA
title_full	Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA
title_fullStr	Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA
title_full_unstemmed	Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA
title_sort	hybrid rhyolitic eruption at big glass mountain, ca, usa
publisher	Volcanica
publishDate	2021
url	https://doaj.org/article/d04aae3fc7ff4fac8350c538f955fa33
work_keys_str_mv	AT jonathancastro hybridrhyoliticeruptionatbigglassmountaincausa AT sebastiancwalter hybridrhyoliticeruptionatbigglassmountaincausa
_version_	1718420813960445952

Hybrid rhyolitic eruption at Big Glass Mountain, CA, USA

Ejemplares similares