Tenham (meteorite)

Tenham meteorite
On display in the Natural History Museum, London
Type	Chondrite
Class	Carbonaceous chondrite
Country	Australia
Region	Tenham station, South Gregory, western Queensland
Fall date	1879

Tenham meteorites are the fragments of a larger meteorite that fell in 1879 in a remote area of Australia near the Tenham station, South Gregory, in western Queensland. Although the fall was seen by a number of people its exact date has not been established. Bright meteors were seen to be moving roughly from west to east. Stones were subsequently recovered from over a large area, about 20 kilometres (12 mi) long by 5 kilometres (3.1 mi) wide.

Because the Tenham meteorites were recovered quite soon after they fell, from a remote and dry region in which weathering and other alterations had not set in, they have been invaluable for scientific study of meteorites and their mineral contents. They are examples of chondritic meteorites, containing a high level of organic compounds, and rich in silicates, oxides, and sulfides. Many scientific studies have explored the mineralogy of these meteorites and their non-terrestrial features.^[1]

Because the Tenham meteorites show evidence of high pressure deformations, they have been used to infer chemical and mineral changes that might occur within Earth's mantle.^[2]

Ringwoodite, the high pressure forsterite polymorph named after Ted Ringwood was discovered in fragments of the Tenham meteorite.^[3]

In 2014, a team of scientists at Argonne National Laboratory studied a sample of bridgmanite, a silicate perovskite ((Mg,Fe)SiO₃),^[4] taken from the Tehnam meteorite. The team used micro-focused X-rays for diffraction analysis and fast-readout area-detector techniques to avoid damage to the sample. The study yielded results not seen when using synthetic samples, including a higher than expected presence of sodium and ferric iron.^[5]

See also

• Glossary of meteoritics

References

1. Tomioka, Naotaka & Fujino, Kiyoshi (22 August 1997). "Natural (Mg,Fe)SiO₃-Ilmenite and -Perovskite in the Tenham Meteorite". Science 277 (5329): 1084–1086. Bibcode:1997Sci...277.1084T. doi:10.1126/science.277.5329.1084. PMID 9262473.
2. Putnis, A & Price, GD (19 July 1979). "High-pressure (Mg, Fe)₂SiO₄ phases in the Tenham chondritic meteorite". Nature 280 (5719): 217–218. Bibcode:1979Natur.280..217P. doi:10.1038/280217a0.
3. Binns, R. A.; Davis, R. J.; Reed, S. J. B. (7 March 1969). "Ringwoodite, Natural (Mg,Fe)2SiO4 Spinel in the Tenham Meteorite". Nature 221 (5184): 943–944. Bibcode:1969Natur.221..943B. doi:10.1038/221943a0.
4. Eos, Transactions American Geophysical Union, Volume 95, Issue 23, Article first published online: 10 June 2014 PDF
5. Kunz, Tona. "Earth’s most abundant mineral finally has a name

Coordinates: 25°44′0″S 142°57′0″E / 25.73333°S 142.95000°E