[meteorite-list] Met Bulletin Update - Braunschweig Approved - April 23, 2013 Fall

From: Graham Ensor <graham.ensor_at_meteoritecentral.com>
Date: Mon, 23 Sep 2013 23:58:35 +0100
Message-ID: <CAJkn+kaK7k-00y7r5BPirn=ZygcYRq0WMRFqbrww1zjSfFL+7Q_at_mail.gmail.com>

Was there any hunting around the area to look for other pieces from
the fall....?

Graham

On Mon, Sep 23, 2013 at 9:45 PM, karmaka <karmaka-meteorites at t-online.de> wrote:
> Well, there was quite some excitement among meteorite aficionados
> in Germany, but it's true that even in the German media this fall was almost not covered.
>
> It's good to have witnessed another German fall after more than a decade.
> It's unfortunate though that it shattered severely on impact.
>
> Best regards
>
> Martin
>
>
> Von: "Galactic Stone & Ironworks" <meteoritemike at gmail.com>
> An: Meteorite List <meteorite-list at meteoritecentral.com>
> Betreff: [meteorite-list] Met Bulletin Update - Braunschweig Approved - April 23, 2013 Fall
> Datum: Mon, 23 Sep 2013 21:39:58 +0200
>
> Hi Bulletin Watchers,
>
> Lost in all of the excitement about Chelyabinsk was the 04-23-13 fall
> of the Braunschweig L6 meteorite in Germany.
>
> Link - http://www.lpi.usra.edu/meteor/metbull.php?code=58083
>
> Write-up :
>
> Braunschweig 52?13.548?N, 10?31.193?E
> Niedersachsen, Germany
> Fell: 2013 Apr 23, 02:05 a.m.
> Classification: Ordinary chondrite (L6)
>
> History: (R. Bartoschewitz, Bart) Erhard Seemann recognized a rock
> impact in the concrete pavement in his yard 3 m from his front door
> when he came home on April 23, 2013, in the morning. He documented his
> observation and collected the main fragments (~700 g) of the nearly
> complete crushed stone. A neighbor heard a strong hum followed by a
> loud crash that night at about 2:10 a.m. In the morning he found
> several small rock fragments (~50 g) in his gateway. In Ahlum village,
> Julian Mascow was surprised by a bright flare coming from the SE,
> ending in a short tracer just over his head. About 90 s later he was
> frightened by an explosion and ensuing rattling sound around him. Mark
> Vornhusen?s web camera documented the fireball from Vechta. When
> Rainer Bartoschewitz documented the meteorite impact, he discovered
> many further small fragments (~500 g) within 18 m of the others.
>
> Physical characteristics: (R. Bartoschewitz, Bart) One meteorite
> individual of about 1.3 kg broken into hundreds of small fragments
> after impacting concrete pavement. The biggest fragment, 214 g, stuck
> in the concrete making a 7 cm diameter, 3 cm deep impression. Other
> fragments were <30 g. The gray-white meteorite material is covered by
> a 0.4 mm thick dull black fusion crust with abundant 50 ?m cracks.
> Magnetic susceptibility log ? = 4.75.
>
> Petrography: (R. Bartoschewitz, Bart) Recrystallized matrix of
> olivine, pyroxene (0.02-0.5 mm) and secondary feldspar bear poorly
> developed and deformed, dominantly barred olivine chondrules (0.5 to
> 15 mm, av. 1.5 mm), metal, troilite and chromite. Dark metal-troilite
> veins (50 ?m) cross the meteorite. Olivine shows rather sharp
> extinction and irregular cracks.
>
> Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel)
> olivine Fa24.3-26.0 (mean Fa25.2?0.40, n=33); Ca-poor pyroxene
> Fs20.8-21.7Wo1.0-1.8 (mean Fs21.3?0.24Wo1.6?0.20, n=12); Ca-rich
> pyroxene Fs8.1-8.8Wo44.4-45.2 (mean Fs8.4?0.40Wo44.7?0.35, n=4);
> feldspar An11-18Or 4-10, chromite Cr/(Cr+Al)=88.3, Fe/(Fe+Mg)=79.8.
> Kamacite Ni=4.7-6.2, Co=1.0; taenite Ni=20-34, Co=0.3-0.7 (all in
> wt.%)
>
> Classification: L chondrite (L6, S4, W0)
>
> Specimens: Main mass of about 700 g, E. Seemann, Braunschweig; type
> specimen of 25 g, MKBraun; 500 g, Bart
>
>
> Best regards and happy huntings,
>
> MikeG
>
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Received on Mon 23 Sep 2013 06:58:35 PM PDT