Late Glacial-Holocene tephra from southern Patagonia and Tierra del Fuego (Argentina, Chile): A complete textural and geochemical fingerprinting for distal correlations in the Southern Hemisphere

QUATERNARY SCIENCE REVIEWS

卷:195

Article

Del Carlo, Paola¹  Di Roberto, Alessio¹  D'Orazio, Massimo²  Petrelli, Maurizio³  Angioletti, Andrea²  Zanchetta, Giovanni^1,2  Maggi, Valter⁴  Daga, Romina^5,6  Nazzari, Manuela^7,8  Rocchi, Sergio² 

[1] Ist Nazl Geofis & Vulcanol, Sez Pisa, Via Faggiola 32, I-56126 Pisa, Italy

[2] Univ Pisa, Dipartimento Sci Terra, Via Santa Maria 53, I-56126 Pisa, Italy

[3] Univ Perugia, Dipartimento Fis & Geol, Via A Pascoli, I-06123 Perugia, Italy

[4] Univ Milan, Dipartimento Sci Ambiente & Terr, Bicocca Piazza Sci 1, I-2016 Milan, Italy

[5] Ctr Atom Bariloche, Lab Anal Activac Neutron, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[6] CONICET Patagonia Norte, Ctr Cient Tecnol, Av Pioneros 2350, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[7] Ist Nazl Geofis & Vulcanol, Sez Roma1, Via Vigna Murata 605, I-00143 Rome, Italy

[8] Sapienza Univ Roma, Dipartimento Sci Terra, Piazzale Aldo Moro 5, Rome, Italy

关键词: Tephra;    South America;    Patagonia and Tierra del Fuego;    Explosive volcanism;    Holocene;    Hudson volcano;    Mt Burney volcano;    Reclus volcano;    Antarctica;   

DOI  :  10.1016/j.quascirev.2018.07.028

来源: Elsevier

【 摘 要 】

Explosive volcanoes from the southern Andes are able to disperse ash over wide areas of the Southern Hemisphere, potentially as far as Antarctica. With the aim of improving correlations between sources and tephra in southernmost South America and, possibly, Antarctica, this work presents new field, textural and geochemical data on tephra layers from southern Patagonia and Tierra del Fuego (Argentina and Chile). Major- and trace-element data, obtained on single glass shards allowed to identify tephra sources in Late Glacial-Holocene eruptions from Hudson, Reclus and Mt Burney volcanoes, located in the Southern and Austral Volcanic Zone of the Andean Cordillera. Twelve new radiocarbon age determinations of charcoals, peats and soils have further constrained the correlations between the studied tephra layers and known eruptions from Hudson, Mt Burney and Reclus volcanoes. Therefore, this study contributes to expand the geochemical dataset on volcanic glasses valuable for tephra correlations in South America, and improves the current tephrostratigraphic framework of this region. Furthermore, we revised literature data by compiling a database including Neogene-Quaternary volcanic tephra found in Antarctic ice cores, marine sediments, blue ice and continental outcrops as well as tephra produced by volcanic sources located in Antarctica and circum-Antarctic areas. This revision shows that Antarctic tephra can be correlated with confidence to Antarctic and circum-Antarctic (South Shetlands and South Sandwich Islands) volcanic sources, whereas correlations with South American sources are arguable, and a complete geochemical fingerprinting is needed for validation. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free