http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29154

The obsidian from Quiron (Salta province, Argentina): a new reference glass for fission-track dating. (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

The obsidian from Quiron (Salta province, Argentina): a new reference glass for fission-track dating. (Articolo in rivista) (literal)

Anno

2005-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.radmeas.2004.12.005 (literal)

Alternative label

Bigazzi G. (1); Laurenzi M.A. (1); Viramonte J.G. (2) (2005)
The obsidian from Quiron (Salta province, Argentina): a new reference glass for fission-track dating.
in Radiation measurements; Pergamon-Elsevier Science Ltd., Oxford (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Bigazzi G. (1); Laurenzi M.A. (1); Viramonte J.G. (2) (literal)

Pagina inizio

613 (literal)

Pagina fine

616 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.journals.elsevier.com/radiation-measurements/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

39 (literal)

Rivista

Radiation measurements (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

4 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

6 (literal)

Note

Scopu (literal)
ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

(1) Istituto di Geoscienze e Georisorse, CNR, V.G. Moruzzi, 1, 56124 Pisa, Italy. (2) Instituto Geonorte, Universidad Nacional de Salta and Conicet, Buenos Aires 177, 4400 Salta, Argentina. (literal)

Titolo

The obsidian from Quiron (Salta province, Argentina): a new reference glass for fission-track dating. (literal)

Abstract

In the course of a geochronological study of the volcanic activity in the Andean Cordillera in northern Argentina, we have found in the El Quevar volcanic complex (24º19S/66º43W,6180m) a phenocryst poor obsidian (Quiron obsidian) showing an unusually high spontaneous track density. Defects which might produce spurious tracks are virtually absent. Application of fission-track dating using an absolute approach, based on the IRMM-540 standard glass for neutron fluence measurements, yielded an apparent age of 7.27±0.29 Ma(1 sigma) and a plateau age of 8.99±0.31 Ma(1 sigma). A 40Ar-39Ar isochron age on biotite of 8.61±0.04 Ma(1 sigma) was already available for the Quiron rhyolite. We determined further 40Ar-39Ar ages on several chips of the glass itself using two analytical approaches: total fusion with a focussed laser beam (LTFA) and a step-heating approach using a de-focussed laser beam (LSHA). We have obtained a weighted average of 8.77±0.09 Ma, an isochron age of 8.71±0.12 Ma and an integrated age of 8.77±0.09 Ma for LTF analyses, and a w.a. of 8.75±0.09 Ma, an iso.a. of 8.77±0.09 Ma and an int.a. of 8.77±0.09 Ma for LSH analyses (all age errors are 2 sigma ). The Quiron obsidian is very easy to analyse for its high spontaneous track density and because microlites which might produce spurious tracks are very rare. Independent reference 40Ar-39Ar ages determined in different laboratories are available. For these reasons we believe that this glass may be very useful for testing fission-track system calibrations and apparent age correction procedures. Splits of obsidian Quiron will be distributed upon request to colleagues who intend to test it. (literal)

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