Stratigraphy of the 8.5 9.0 ka B.P. Citlaltépetl pumice fallout sequence
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
2004
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| _version_ | 1876481957196464128 |
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| author | Gerardo Carrasco Nuñez |
| author_facet | Gerardo Carrasco Nuñez |
| contents | Stratigraphy of the 8.5 9.0 ka B.P. Citlaltépetl pumice fallout sequence Gerardo Carrasco Nuñez Andrea Rossotti Ciencias de la Tierra correlation granulometry fallout deposit radiocarbon dating Citlaltépetl volcano Citlaltépetl is an active volcano presently in a dormant state, belonging to the easternmost part ofthe Mexican Volcanic Belt. Although the volcano is characterized by long periods of volcanic repose,some explosive plinian eruptions occurred in Holocene time. In particular, an eruptive period between8.59.0 ka B.P. originated an alternated sequence of pumice and scoria flows called Citlaltépetl Ignimbrite(0.26 km3 DRE) and a few ash and lapilli fallout deposits (Citlaltépetl Pumice) with a wide dispersionrange around the cone. In this work we present a detailed reconstruction of the fallout CitlaltépetlPumice stratigraphy based on the combined study of 107 vertical sections, grain-size and componentanalysis of each layer. The eruptive sequence comprises a succession of pyroclastic deposits, includingfour major eruptive episodes.New radiocarbon dating on charcoal fragments interbedded in the flow deposits beneath thefallout and in the fallout itself show ages younger than 9,475±160 yr. B.P. and older than 8,505±50 yr.B.P., respectively, which is in accordance with previous dates. Stratigraphy and dating allowed a precisestratigraphic correlation of the most representative fallout deposits of the Holocene history of Citlaltépetlvolcano and their relationship with associated pyroclastic flows. Such data provide new insights on theformation and eruptive history of the Citlaltépetl Ignimbrite that is of basic importance for furthereruptive column modeling with important implications in the volcanic hazard assessment. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221304 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.21 |
| format | Artículo científico |
| id | redalyc_57221304 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Stratigraphy of the 8.5 9.0 ka B.P. Citlaltépetl pumice fallout sequence Gerardo Carrasco Nuñez Ciencias de la Tierra correlation granulometry fallout deposit radiocarbon dating Citlaltépetl volcano Stratigraphy of the 8.5 9.0 ka B.P. Citlaltépetl pumice fallout sequence Gerardo Carrasco Nuñez Andrea Rossotti Ciencias de la Tierra correlation granulometry fallout deposit radiocarbon dating Citlaltépetl volcano Citlaltépetl is an active volcano presently in a dormant state, belonging to the easternmost part ofthe Mexican Volcanic Belt. Although the volcano is characterized by long periods of volcanic repose,some explosive plinian eruptions occurred in Holocene time. In particular, an eruptive period between8.59.0 ka B.P. originated an alternated sequence of pumice and scoria flows called Citlaltépetl Ignimbrite(0.26 km3 DRE) and a few ash and lapilli fallout deposits (Citlaltépetl Pumice) with a wide dispersionrange around the cone. In this work we present a detailed reconstruction of the fallout CitlaltépetlPumice stratigraphy based on the combined study of 107 vertical sections, grain-size and componentanalysis of each layer. The eruptive sequence comprises a succession of pyroclastic deposits, includingfour major eruptive episodes.New radiocarbon dating on charcoal fragments interbedded in the flow deposits beneath thefallout and in the fallout itself show ages younger than 9,475±160 yr. B.P. and older than 8,505±50 yr.B.P., respectively, which is in accordance with previous dates. Stratigraphy and dating allowed a precisestratigraphic correlation of the most representative fallout deposits of the Holocene history of Citlaltépetlvolcano and their relationship with associated pyroclastic flows. Such data provide new insights on theformation and eruptive history of the Citlaltépetl Ignimbrite that is of basic importance for furthereruptive column modeling with important implications in the volcanic hazard assessment. 2004 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57221304 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.3 Vol.21 |
| title | Stratigraphy of the 8.5 9.0 ka B.P. Citlaltépetl pumice fallout sequence |
| topic | Ciencias de la Tierra correlation granulometry fallout deposit radiocarbon dating Citlaltépetl volcano |
| url | https://www.redalyc.org/articulo.oa?id=57221304 |