RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

The Getafe rock : Fall, composition and cosmic ray records of an unusual ultrarefractory scoriaceous material

Auteur(s) / Author(s)

MARTINEZ-FRIAS J. (1) ; WEIGEL A. (2) ; MARTI K. (2) ; BOYD T. (3) ; WILSON G. H. (4) ; JULL T. (5) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Dpto. de Geología. Museo Nacoinal de ciencias Naturales (CSIC). C/ José Gutiérrez Abascal, 2., 28006 Madrid, ESPAGNE
(2) Dpt. of Chemistry. University of California. San Diego, 9500 Gilman Drive, La Jolla, CA 92093, ETATS-UNIS
(3) Dpt. of Geology. University of Toronto, Toronto, Ontario M5S 3B1, CANADA
(4) Iso Trace Laboratory. University of Toronto. 60 St. George street, Toronto, Ontario, M5S 1A7, ETATS-UNIS
(5) University of Arizona. NSF Arizona AMS Facility, Tucson, AZ, 85721, ETATS-UNIS

Résumé / Abstract

In 1994 a moving car and its driver, on a highway in southem Madrid (Getafe), were struck by a falling rock. Eighty-one additional fragments (total weight : 55.926 kg) were later recovered, which all pointed towards a meteorite fall. A study of the composition of this object revealed an ultrarefractory material displaying a most unusual chemical make-up which differs from any known meteorite class, and for some elements and minerals approaches the composition of CAI (Ca-Al-rich inclusions in chondrites). A study of some cosmic-ray-produced stable and radioactive nuclides indicates: a) space and terrestrial exposure ages which do not exceed 1,000 and 520,000 years, respectively; b) the presence of a small 22Ne excess (1,100 °C fraction), which suggests either a nucleogenic contribution from the 19F(α,n)22Ne reaction or a trapped Ne signature distinct from atmospheric Ne, and c) the existence of minor variations in the 38Ar/36Ar ratios also indicating a nucleogenic component or fractionation effects. 14C data are consistent with modem carbon originated in the period 1955-1958 and not earlier or more recently. The possibility that the Getafe rock could have a man-made origin (i.e. ceramic and refractory tiles, industrial slag) is also considered.

Revue / Journal Title

Revista de metalurgia    ISSN  0034-8570   CODEN RMTGAC 

Source / Source

1999, vol. 35, no5, pp. 308-314 (29 ref.)

Langue / Language

Anglais
Revue : Espagnol

Editeur / Publisher

Centro Nacional de Investigaciones Metalúrgicas, Madrid, ESPAGNE  (1965) (Revue)

Mots-clés anglais / English Keywords

meteorites

;

refractory materials

;

Madrid Spain

;

chemical analysis

;

cosmic rays

;

exposure age

;

neon

;

Ne-22

;

nucleosynthesis

;

Ar-38/Ar-36

;

argon

;

textures

;

scanning electron microscopy

;

SEM data

;

slag

;

mineral assemblages

;

provenance

;

Ne-22/Ne-20

;

Ar-40/Ar-36

;

New Castile Spain

;

Castile Spain

;

Spain

;

Iberian Peninsula

;

Southern Europe

;

Europe

;

Mots-clés français / French Keywords

Météorite

;

Matériau réfractaire

;

Province Madrid

;

Analyse chimique

;

Rayonnement cosmique

;

Age exposition

;

Néon

;

Ne 22

;

Nucléosynthèse

;

Ar 38-Ar 36

;

Argon

;

Texture

;

Microscopie électronique balayage

;

Donnée MEB

;

Laitier

;

Association minérale

;

Origine

;

Ne 22-Ne 20

;

Ar 40-Ar 36

;

Getafe

;

Ne 21-Ne 20

;

Nouvelle Castille

;

Castille

;

Espagne

;

Péninsule Ibérique

;

Europe Sud

;

Europe

;

Mots-clés espagnols / Spanish Keywords

Meteorito

;

Provincia Madríd

;

Análisis químico

;

Edad exposición

;

Neón

;

Ne 22

;

Argón

;

Textura

;

Dato MEB

;

Asociación mineral

;

Origen

;

Castilla la Nueva

;

España

;

Península ibérica

;

Europa Sur

;

Europa

;

Localisation / Location

INIST-CNRS, Cote INIST : 2549, 35400008023179.0040

Nº notice refdoc (ud4) : 1271325



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas