Mesosiderite: Difference between revisions
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[[File:Vaca muerta mesosiderite.jpg|thumb|Vaca muerta mesosiderite]] |
[[File:Vaca muerta mesosiderite.jpg|thumb|Vaca muerta mesosiderite]] |
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[[File:Chinguetti meteorite.jpg|thumb|Chinguetti mesosiderite]] |
[[File:Chinguetti meteorite.jpg|thumb|Chinguetti mesosiderite]] |
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[[File:Portales Valley meteorite2.jpg|thumb|Portales Valley mesosiderite]] |
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'''Mesosiderites''' are a class of [[stony-iron meteorite]]s consisting of about equal parts of metallic nickel-iron and [[silicate]]. They are [[breccia]]s with an irregular texture; silicates and metal occur often in lumps or pebbles as well as in fine-grained intergrowths. The silicate part contains [[olivine]], [[pyroxenes]], and Ca-rich [[feldspar]] and is similar in composition to [[eucrite]]s and [[diogenite]]s. <ref> F. Heide, F. Wlotzka: Meteorites, Messengers from Space. Springer Verlag 1985.</ref> |
'''Mesosiderites''' are a class of [[stony-iron meteorite]]s consisting of about equal parts of metallic nickel-iron and [[silicate]]. They are [[breccia]]s with an irregular texture; silicates and metal occur often in lumps or pebbles as well as in fine-grained intergrowths. The silicate part contains [[olivine]], [[pyroxenes]], and Ca-rich [[feldspar]] and is similar in composition to [[eucrite]]s and [[diogenite]]s. <ref> F. Heide, F. Wlotzka: Meteorites, Messengers from Space. Springer Verlag 1985.</ref> |
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Revision as of 11:14, 23 January 2011
 | This article needs additional citations for verification. (May 2009) |
Mesosiderites are a class of stony-iron meteorites consisting of about equal parts of metallic nickel-iron and silicate. They are breccias with an irregular texture; silicates and metal occur often in lumps or pebbles as well as in fine-grained intergrowths. The silicate part contains olivine, pyroxenes, and Ca-rich feldspar and is similar in composition to eucrites and diogenites. [1]
They are a rare type of meteorite; as of June 2009 only 145 are known (of which 44 come from Antarctica) and only 7 of these are observed falls. On the other hand, some mesosiderites are among the largest meteorites known.
At Vaca Muerta in the Atacama desert in Chile, many fragments with a total mass of 3.8 tons were found in a large strewnfield. They were first discovered in the 19th century by ore prospectors who mistook the shiny metal inclusions for silver and thought they had found an outcrop of a silver ore deposit. Later when an analysis was made and nickel-iron was found, the true nature as a meteorite was established. [2] The picture at right shows a cut and polished piece of Vaca Muerta.
The most recent fall of a mesosiderite occurred at Dong Ujimqin Qi in China, on September 7, 1995, where three large pieces with a total mass of 129 kg fell. The fall of the Estherville mesosiderite in Iowa, USA occurred on May 10, 1879. After a brilliant fireball had been seen, a shower of several large masses and many small fragments fell, totaling 320 kg. The fall at Lowicz in Poland on March 12, 1935 yielded many (more than 50) fragments with a total weight of 59 kg. The other observed mesosiderite falls occurred in 1842 at Barea (Spain), in 1880 at Varamin (Iran), in 1933 at Dyarrl Island (Papua New Guinea), and at Patwar (India) in 1935.[3] The legendary Chinguetti meteorite is also supposed to be a mesosiderite.
References
- ^ F. Heide, F. Wlotzka: Meteorites, Messengers from Space. Springer Verlag 1985.
- ^ H. Pedersen et al., Meteoritics 27 (1992) 126
- ^ The Meteoritical Bulletin Database, http://www.lpi.usra.edu/meteor/metbull.php
External links
- Mesosiderite images from Northern Arizona University
- Mesosiderite images from Meteorites Australia