| 词条 | Tamdakht meteorite |
| 释义 |
|Name = Tamdakht meteorite |Alternative names = |Image = Tamdakht meteorite small.jpg |Image_caption = |Type = Ordinary chondrite[1] |Class = H5 |Clan = |Group = |Grouplet = |Subgroup = |Structural_classification = |Parent body = |Composition = |Shock = S3 |Weathering = W0 |Country = Morocco |Region = Ouarzazate |Lat_Long = {{coord|31|09.8||N|7|00.9||W|display=inline,title}} |Observed_fall = Yes |Fall_date = 2008-12-20 |Found_date = 2009-01-03 ff |TKW = ~{{Convert|100|kg}} |Strewn_field = Yes |Image2 = |Image2_caption = }} The Tamdakht meteorite fell near Ouarzazate, Morocco on 2008-12-20 producing a strewn field of approximately {{convert|25|km}} by {{convert|2|km}} and two small impact craters, one of about {{convert|1.1|m}} diameter and {{convert|70|cm}} depth at {{coord|31|09.8||N|7|00.9||W}} and the other of about {{convert|20|cm}} diameter and {{convert|10|cm}} depth at {{coord|31|09.9||N|07|02.3||W}}.[1] The meteorite is named after a village close to the fall.[2] On April 22, 2017 small bits of the meteorite were handed out to children at the Boston March for Science. MineralogyPetrology: (by Albert Jambon, Omar Boudouma, D. Badia UPVI and M. Denise, MNHNP[1]): Abundant chondrules with visible but not well-delimited outlines. Chondrule size is 0.1 to 1.5 mm. Dominant olivine and orthopyroxene. Abundant chromite, rare clinopyroxene and ilmenite. Numerous pockets with chromite, plagioclase and phosphate (merrilite and Cl-apatite). Kamacite, with deformed Neumann bands, and taenite, twinned troilite. Copper. Mode: metal+troilite 10%. Mineral compositions and geochemistry:[1] log χ = 5.3. Olivine Fa18 ± 0.5 Opx = En83 Fs16 Wo2 Minor calcic pyroxene. Plagioclase is Ab83–86 An5–15 Or7–2. Ca-phosphate (merrillite and Cl-apatite). Chromite: Cr# (100× molar Cr/[Cr + Al]) = 82. Metal: kamacite with 5% Ni and taenite with 36–47% Ni. Oxygen isotopes (C. Suavet, J. Gattacecca CEREGE): δ17O = 3.26‰, δ18O = 5.01‰, and Δ17O = 0.65‰. Magnetic susceptibility is log χ = 5.3 × 10–9 m3/kg. ClassificationOrdinary chondrite (H5), S3, W0.[1] See also
References1. ^1 2 3 4 {{cite web|title=Tamdakht|url=http://www.lpi.usra.edu/meteor/metbull.php?code=48691|work=Meteoritical Bulletin Database|publisher=Meteoritical Society|accessdate=22 December 2012}} 2. ^{{cite web|last=THOMAS|first=Philippe|title=Tamdakht|url=http://www.meteoritica.com/hunting%20tamdakht.htm|work=METEORITICA|accessdate=22 December 2012}} See also
2 : Meteorites found in Morocco|Chondrite meteorites |
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