Journal
MINERALS
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/min11060628
Keywords
meteorites; tektites; Mossbauer spectroscopy
Funding
- FCT-Fundacao para a Ciencia e a Tecnologia, I.P. [UIDB/04564/2020, UIDP/04564/2020, UID/00611/2020]
- QREN-Mais Centro Project [ICT_2009_02_012_1890]
- Fundação para a Ciência e a Tecnologia [UIDB/04564/2020, UIDP/04564/2020] Funding Source: FCT
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This review discusses the characteristics of iron meteorites, stony meteorites, and tektites, utilizing techniques such as Mossbauer spectroscopy. The main minerals found in iron meteorites are kamacite, while stony meteorites are mainly composed of iron-free silicates. The Fe3+/Fe2+ ratio was found to be higher in Muong Nong-type tektites compared to splash-form tektites.
This review presents studies on iron meteorites (Campo del Cielo fall and an unregistered iron meteorite), an unregistered stony meteorite from Northwest Africa, and 13 tektites from the American, European, and Australasian strewn fields. The main experimental technique used in the studies was Mossbauer spectroscopy, both in transmission and backscattering geometries. For the latter, a MIMOS II spectrometer was used. Additionally, optical and scanning electron microscopies and X-ray diffraction were used. In the studied iron meteorites, kamacite is found as the main mineral. Campo del Cielo meteorite exhibits Widmanstatten patterns and schreibersite inclusions. The unregistered iron meteorite has Neumann lines and schreibersite inclusions. We have assigned Campo del Cielo as an octahedrite and the unregistered iron meteorite as a hexahedrite. The unregistered stony meteorite is composed mainly of iron-free silicates; at 4.2 K, the spectrum indicates maghemite and 1% troilite. The Cambodian tektite appeared individualized from other australasites, unlike the moldavite, which tends to cluster with them. Our analyses do not allow dismissing doubts on the provenance of tibetanites. The Fe3+/Fe2+ ratio was found to be higher for Muong Nong-type tektites than for splash-form tektites, as expected from their morphology and solidification from melt at lower temperature.
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