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Ottawa meteorite, Franklin Co., Kansas, USA

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Latitude & Longitude (WGS84): 38° 36' North , 95° 13' West
Latitude & Longitude (decimal): 38.60000,-95.21667
Non-native locality type:Meteorite
Meteorite Class:LL6 chondrite meteorite
Meteoritical Society Class: LL6
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Cfa : Humid subtropical climate


Ordinary chondrite, brecciated (LL6)
Fall, 9 April 1896; 840 g, single stone

In the late afternoon a series of rapid fire detonations were followed by a whirring sound and a thud. A very surprised farmer attempted to locate the fallen object, but was unable to find anything that day. The next morning his sister found a small meteorite, largely covered with a fusion crust, embedded in the ground about 200 m away from where the farmer had first stood. Detonations had been heard up to 50 km from the impact. The broken portions revealed a light grey chondritic interior with silicate-rich chondrules embedded in a matrix of silicates and opaques. Chondrules of granular olivine (up to 5 mm in diameter) and rarer fine-grained pyroxenes are present. Silicates in both chondrules and matrix — olivine, orthopyroxene, and lesser albitic plagioclase — are accompanied by troilite (~6 wt%) and Fe-Ni metal (~4 wt%). Kamacite and taenite are found both as separate and as contiguous grains. A number of very minor accessory opaques are also reported.

Total iron (21.24 wt%), olivine composition (Fa28), and orthopyroxene composition (Fs25) are characteristic of the LL, very low iron, chondrite group. The LL chondrite group is the smallest of the 3 ordinary chondrite groups and representS ~10 % of all witnessed meteorite falls. Ottawa itself is one of 42 witnessed falls classified exactly as petrologic type 'LL6' at the Meteoritical Bulletin Database (February 2016).

A moderately long cosmic ray exposure age of ~45 Ma has been reported.


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9 valid minerals.

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References

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Mason, B. & Wiik, H.B. (1961) The Composition of the Ottawa, Chateau-Renard, Mocs, and New Concord Meteorites: American Museum Novitates, #2069: 26 pp. (Dec 1961).
Mason, B. (1962) The Classification of Chondritic Meteorites: American Museum Novitates, #2085. New York. 20 pp. (May 1962).
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites.Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Saxena, S.K. (1976) Two-pyroxene geothermometer: a model with an approximate solution. American Mineralogist 61(7&8): 643-652. (July-August 1976).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

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