Modoc (1905) meteorite, Scott Co., Kansas, USA
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): | 38° 30' North , 101° 6' West |
---|---|
Latitude & Longitude (decimal): | 38.50000,-101.10000 |
Non-native locality type: | Meteorite |
Meteorite Class: | L6 chondrite meteorite |
Meteoritical Society Class: | L6 |
Metbull: | View entry in Meteoritical Bulletin Database |
Köppen climate type: | BSk : Cold semi-arid (steppe) climate |
Ordinary chondrite, veined (L6)
Fell, 2 September 1905; 35 kg, 15-20 stones
After the appearance during the night of a bright fireball accompanied by loud detonations, over the next few days and months perhaps 20 stones were recovered spread over an ~3 km x 11 km area. The largest stone had a mass of 4.9 kg. As these and other stones were subsequently recovered at different times, weathering indices are specimen dependent. The black fusion crust of some samples is unusually thick (~0.5 mm) for chondrites. Friable interiors have a pale grey, almost whitish overall color interrupted by small grains of Fe-Ni metal. Chondrules are present, but often indistinct. Olivine and orthopyroxene are the dominant phases of chondrules and matrix, but significant amounts of kamacite, albitic plagioclase, taenite, and troilite are also present. Lesser amounts of chromite, diopside, apatite, and other opaques have been reported as well. I-Xe (~4.51 Ga) and Sm-Nd (~4.05 Ga) ages indicate ancient formation of an original parent body (OPB) with a subsequent strong, perhaps even catastrophic metamorphic event on the OPB (or a daughter asteroid) during the period of the late lunar bombardment.
Total iron (22.4 wt%) and composition of olivine (Fa23) and orthopyroxene (Fs21) are characteristic of the L group of ordinary chondrites (ordinary chondrites relatively low in total iron). Modoc (1905) is one of 269 witnessed falls listed exactly as an 'L6' with the Meteoritical Bulletin Database (Feb 2016). L chondrites account for roughly 40% of all witnessed meteorite falls with the L6 type as the most common petrologic grade.
Nearly half of the recovered mass has been kept at the American Museum of Natural History in New York, but moderately large masses have been held elsewhere. As of 2000, 6.5 kg were in Washington (USNM), 4 kg in Chicago (FMNH), 2 kg in London (NHM) with other smaller samples elsewhere.
What's in a name? For over four decades, "Modoc" was the meteorite's recognized official name. However, one of the meteoritic stones subsequently found in the same area was eventually recognized by Nininger to be an entirely separate meteorite. This second meteorite, an H6 chondrite, was named "Modoc (1948)" and, consequentially, "Modoc (1905)" soon became the new official name of the 1905 fall.
Mineral List
5 valid minerals.
Meteorite/Rock Types Recorded
Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramThis page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
Merrill, G.P. & Tassin, W. (1906) On a new stony meteorite from Modoc, Scott County, Kansas. American Journal of Science and Arts (4th Series) 21: 356-360.
Mason, B. & Wiik, H.B. (1967) The Composition of the Belly River, Bluff, Bremervörde, and Modoc Meteorites. American Museum Novitates, No.2280, New York. 19 pp. (Jan 1967).
Nakamura, N. & Tatsumoto, M. (1980) A 4.0 b. y. impact metamorphism age of the Modoc L6 chondrite determined by the Sm-Nd method: Abstracts of Papers Presented at the Forty-Third Annual Meeting of the Meteoritical Society. LPI Contribution 412: p.133.
Monica M. Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Mason, B. & Wiik, H.B. (1967) The Composition of the Belly River, Bluff, Bremervörde, and Modoc Meteorites. American Museum Novitates, No.2280, New York. 19 pp. (Jan 1967).
Nakamura, N. & Tatsumoto, M. (1980) A 4.0 b. y. impact metamorphism age of the Modoc L6 chondrite determined by the Sm-Nd method: Abstracts of Papers Presented at the Forty-Third Annual Meeting of the Meteoritical Society. LPI Contribution 412: p.133.
Monica M. Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
External Links
http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase
http://www.lpi.usra.edu/meteor/metbull.php?code=16711 -Modoc (1905)@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5630790 - photo
http://www.meteoritehistory.info/AJS/S4VIEWS/V21P356.HTM -Merrill & Tassin (1906)
http://digitallibrary.amnh.org/handle/2246/3084 - AmMusNovitates#2280
http://www.lpi.usra.edu/meteor/metbull.php?code=16711 -Modoc (1905)@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5630790 - photo
http://www.meteoritehistory.info/AJS/S4VIEWS/V21P356.HTM -Merrill & Tassin (1906)
http://digitallibrary.amnh.org/handle/2246/3084 - AmMusNovitates#2280