Quartz pseudomorphs after possible retrogression of coesite were recognized petrographically within garnets of mafic eclogites from the Lanterman Range (Antarctica). In one of the quartz pseudomorphs the presence of a pristine coesite is indicated by in situ Raman microprobe spectroscopy. The results of the Raman analyses show that the quartz inclusion in addition to the typical quartz vibrations has a weak band at 521 cm(-1), which corresponds to the most intense fundamental vibration in coesite. This finding represents a first piece of evidence for ultrahigh-pressure metamorphism in Antarctica which was part of the Gondwana supercontinent affected by the Cambro-Ordovician orogenic cycle.

Ghiribelli, B., Frezzotti, M., Palmeri, R. (2002). Coesite in eclogites of the Lanterman Range (Antarctica): Evidence from textural and Raman studies. EUROPEAN JOURNAL OF MINERALOGY, 14(2), 355-360 [10.1127/0935-1221/2002/0014-0355].

Coesite in eclogites of the Lanterman Range (Antarctica): Evidence from textural and Raman studies

Frezzotti, M
;
2002

Abstract

Quartz pseudomorphs after possible retrogression of coesite were recognized petrographically within garnets of mafic eclogites from the Lanterman Range (Antarctica). In one of the quartz pseudomorphs the presence of a pristine coesite is indicated by in situ Raman microprobe spectroscopy. The results of the Raman analyses show that the quartz inclusion in addition to the typical quartz vibrations has a weak band at 521 cm(-1), which corresponds to the most intense fundamental vibration in coesite. This finding represents a first piece of evidence for ultrahigh-pressure metamorphism in Antarctica which was part of the Gondwana supercontinent affected by the Cambro-Ordovician orogenic cycle.
Articolo in rivista - Articolo scientifico
coesite, mafic eclogites, Raman spectroscopy, Lanterman Range, Antarctica
English
2002
14
2
355
360
reserved
Ghiribelli, B., Frezzotti, M., Palmeri, R. (2002). Coesite in eclogites of the Lanterman Range (Antarctica): Evidence from textural and Raman studies. EUROPEAN JOURNAL OF MINERALOGY, 14(2), 355-360 [10.1127/0935-1221/2002/0014-0355].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/174612
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