[meteorite-list] Dronino - Now Official

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From: Jeff Kuyken <jeff_at_meteoritecentral.com>
Date: Thu Apr 22 10:31:09 2004
Message-ID: <000c01c417a5$432e5890$1a348690_at_mandin4f89ypwu>

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G'day Folks,
=20
For those who have been wondering Dronino is now official. See the =
extract released today. It also mentions that the sulfide inclusions are =
(~10 vol.%).

Cheers,

Jeff Kuyken
I.M.C.A. #3085
www.meteorites.com.au
www.meteoritesaustralia.com

=20
Dronino 54o44.8? N; 41o25.3? E

Ryazan district, Russia
Found July 2000
Iron, ataxite (ungrouped)

A 40kg iron was found by Oleg Gus'kov, Moscow resident, as he
was returning home from collecting mushrooms near the village
of Dronino in the Ryazan district. In early 2003, it was taken to
Vernad, and identified as meteoritic. In summer 2003, scientific
expeditions and meteorite hunters collected more than 600 fragments
(the largest is 250 kg) totaling about 3 000 kg and occurring
at a depth of 0.2-2 m across an area of 0.5x1.5 km. The
distribution of the fragments suggests that the meteorite formed a
now-buried crater about 30 m in diameter. This crater is not reflected
in the present-day topography of the site. No historical
records exist of a meteorite fall, thus it appears likely that the
meteorite fell earlier than the 12th century when the area was
largely unpopulated. Classification and mineralogy (D.
Badyukov, M. Nazarov, Vernad; J. Wasson, UCLA): the Dronino
iron is an ataxite containing sulfide inclusions (~10 vol.%) and
consisting of kamacite (7.0=B10.5 wt% Ni and 0.75 wt% Co) and
rare taenite (26.5=B10.5 wt% Ni and 0.35 wt% Co) as elongated
precipitates (1-3 =B5m in size) which form linear and banded textures;
sulfide inclusions (up to a few mm in size) rounded and
elongated along the banding; accessories are chromite and Fe
phosphate (graftonite?); no phosphide was found and P is not
detectable in metal with EMP; INAA data: Ni 98.1, Co 5.54
(mg/g), Cr 37, Cu 32, Ga <0.3, As 3.52, W 0.38, Ir 1.68 ppm, Au
0.284 (=B5g/g); the meteorite is most close to IVA irons in Ni, Ir
and the low P but the low Au and Ga contents distinguish the
Dronino element pattern from that of all known iron meteorite
groups. Dronino meteorite fragments are heavily weathered and
covered with rust 1-3 cm thick. Sulfide nodules are surrounded
by Fe hydroxides, which replace metal. Troilite of the nodules is
commonly replaced with unknown Fe,Ni sulfides. Specimens:
type specimen 700 kg including the largest 250 kg piece Vernad.

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G'day Folks,   For those who =
have been=20
wondering Dronino is now official. See the extract released today. It =
also=20
mentions that the sulfide inclusions are (~10 vol.%).
Cheers,
Jeff Kuyken I.M.C.A. =
#3085 <A=20
href=3D"http://www.meteorites.com.au"><FONT=20
size=3D2>www.meteorites.com.au</A> <A=20
href=3D"http://www.meteoritesaustralia.com"><FONT=20
size=3D2>www.meteoritesaustralia.com</A>
   Dronino =
54o44.8΄ N;=20
41o25.3΄ E
 Ryazan district, Russia Found July =

2000 Iron, ataxite (ungrouped)
 A 40kg iron was found by Oleg =
Gus=92kov, Moscow=20
resident, as he was returning home from collecting mushrooms near the =

village of Dronino in the Ryazan district. In early 2003, it was =
taken=20
to Vernad, and identified as meteoritic. In summer 2003,=20
scientific expeditions and meteorite hunters collected more than 600=20
fragments (the largest is 250 kg) totaling about 3 000 kg and =
occurring at=20
a depth of 0.2-2 m across an area of 0.5x1.5 km. The distribution of =
the=20
fragments suggests that the meteorite formed a now-buried crater =
about 30 m=20
in diameter. This crater is not reflected in the present-day =
topography of=20
the site. No historical records exist of a meteorite fall, thus it =
appears=20
likely that the meteorite fell earlier than the 12th century when the =
area=20
was largely unpopulated. Classification and mineralogy =
(D. Badyukov, M.=20
Nazarov, Vernad; J. Wasson, UCLA): the Dronino iron is an ataxite =
containing=20
sulfide inclusions (~10 vol.%) and consisting of kamacite (7.0=B10.5 =
wt% Ni and=20
0.75 wt% Co) and rare taenite (26.5=B10.5 wt% Ni and 0.35 wt% Co) as=20
elongated precipitates (1-3 =B5m in size) which form linear and =
banded=20
textures; sulfide inclusions (up to a few mm in size) rounded=20
and elongated along the banding; accessories are chromite and =
Fe phosphate=20
(graftonite?); no phosphide was found and P is not detectable in =
metal with=20
EMP; INAA data: Ni 98.1, Co 5.54 (mg/g), Cr 37, Cu 32, Ga <0.3, As =
3.52, W=20
0.38, Ir 1.68 ppm, Au 0.284 (=B5g/g); the meteorite is most close to =
IVA irons=20
in Ni, Ir and the low P but the low Au and Ga contents distinguish=20
the Dronino element pattern from that of all known iron =
meteorite groups.=20
Dronino meteorite fragments are heavily weathered and covered with =
rust 1-3=20
cm thick. Sulfide nodules are surrounded by Fe hydroxides, which =
replace=20
metal. Troilite of the nodules is commonly replaced with unknown =
Fe,Ni=20
sulfides. Specimens: type specimen 700 kg including the largest 250 =
kg piece=20
Vernad.
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Received on Wed 31 Mar 2004 11:53:20 PM PST

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