This paper reports the characteristics of a suite of pale green glass fragments and their metallic spherule inclusions (5 to 400 μm) found over a relatively wide area between Inzigkofen and Sigmaringen (Bavaria, Germany), about 150 km SW of the Steinheim-Ries impact craters. The distribution area of these glasses and their close macroscopic similarity (apart from the spherules) with moldavite suggested us that they may shed new light on the nature of the binary asteroid which caused the Steinheim-Ries impact craters. However, our petrographic and chemical data rule out an extra-terrestrial origin. Metallographic microstructure, lack of Ni and high P contents (up to 9 wt.%) reveal the metallic inclusions as cast iron spherules. The chemical composition of the host glass consistently differs from both moldavite and suevite compositions. Our data indicate that the investigated samples are by-products of metallurgic activity. This conclusion is consistent with the presence in the Sigmaringen area of important cast iron furnaces which have been operating since the 18th century.

Determination of the origin of unusual glass with metallic spherule inclusions found in the area between Inzingkofen and Sigmaringen (Bavaria, Germany), South-West of the Steinheim-Ries craters.

ARDIT, Matteo;
2006

Abstract

This paper reports the characteristics of a suite of pale green glass fragments and their metallic spherule inclusions (5 to 400 μm) found over a relatively wide area between Inzigkofen and Sigmaringen (Bavaria, Germany), about 150 km SW of the Steinheim-Ries impact craters. The distribution area of these glasses and their close macroscopic similarity (apart from the spherules) with moldavite suggested us that they may shed new light on the nature of the binary asteroid which caused the Steinheim-Ries impact craters. However, our petrographic and chemical data rule out an extra-terrestrial origin. Metallographic microstructure, lack of Ni and high P contents (up to 9 wt.%) reveal the metallic inclusions as cast iron spherules. The chemical composition of the host glass consistently differs from both moldavite and suevite compositions. Our data indicate that the investigated samples are by-products of metallurgic activity. This conclusion is consistent with the presence in the Sigmaringen area of important cast iron furnaces which have been operating since the 18th century.
Ardit, Matteo; Fioretti, A. M.; Molin, G.; Ramous, E.; Bauer, U. C.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/1454516
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact