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Roll Overs:
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#2
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Photos by Marco Langbroek. Copyright (c) Marco Langbroek.
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CM2-an
TKW 68.4 grams. Observed fall 27 October 1873, Diepenveen, the Netherlands.
  
Marco writes:
The Diepenveen CM2-anomalous carbonaceous chondrite fell on 27 October 1873 in
an agricultural field near the hamlet of Diepenveen, Overijssel Province, the
Netherlands. It's existence was unknown to science untill rediscovery in a
private collection in 2012, 139 years after the fall.
Through the son of the Diepenveen village teacher, Derk Herman te Wechel, the
meteorite initially entered into a curiosa collection of the HBS (Higher
Civilian School) of nearby Deventer town and next was forgotten for almost a
century. After the school was closed down in the late 1960-ies, a teacher, Mr De
Jager, rescued the wooden box with the meteorite and for many years kept it at
home, untill his death. His widow next donated the stone to a friend, Mrs Kiers.
In 2012, former Eisse Eisinga planetary curator Henk Nieuwenhuis rediscovered
the meteorite, the existence of which so far had been unknown to science, when
he serendipitously noted the wooden box and stone in posession of Mrs Kiers. Mrs
Kiers subsequently donated the meteorite to the Dutch National Collection
curated by Naturalis Biodiversity Center in Leiden (the Dutch National Museum of
Natural History).
The late 19th century cardboard specimen card signed by D.H. te Wechel, titled
"Meteor Stone", mentions (in Dutch) that the stone fell near Diepenveen on 27
October 1873 around 3 pm local time, "with loud whistling and a blinding light",
near farm labourer A. Bos and his wife who where working on the land of Squire
J.W. Ilsinck. It was recovered within minutes of the fall from a 1.5 foot deep
impact pit and "still noticably warm" at that time.
Farm labourer A. (Albert) Bos and landowner J.W. (Jan Willem) Ilsinck, as well
as the Diepenveen village teacher and his stepson D.H. (Derk Herman) te Wechel
who wrote the account, have all been traced in historic archives.
At a later date, someone glued a second label in the box, with a literature
reference to the Orgeuill meteorite.
Diepenveen (published in MAPS 54, 2019, 1431-1461) is an anomalous CM meteorite
with an unusually old CRE age for a CM meteorite of about ~5 Ma, and a young
K-Ar resetting age of 1.5 Ga. The Oxygen Isotope values are unusual with an
extremely 16O rich bulk composition. Petrologically it is a CM, but its
amino-acid composition is more like that of a CI chondrite. It is a regolith
breccia with evidence for impact processing and clasts showing various levels of
aqueous alteration. The reflectance spectrum is similar to that of asteroid
Ryugu, the target of the Hayabusa2 sample return mission.
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#2
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Found at the arrow (green or red) on the map below
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Anne Black
10/22/2019 2:23:26 PM |
Yes, great re-discovery. But that raises the unavoidable question: how many meteorites are still hiding in boxes and drawers of museums and other institutions, waiting to be re-discovered? |
Bernd Pauli
10/22/2019 5:42:08 AM |
The paper Marco mentions is: LANGBROEK M. et al. (2019) The CM carbonaceous chondrite regolith Diepenveen (MAPS 54-07, 2019, 1431-1461). |
matthias
10/22/2019 4:10:21 AM |
Great ensemble, great story about a metepoite fall which has it all: the whistling noise, the warmth, the lightning fast discovery, the utmost rare class, the fading into obscurity, the rediscovery ... - wonderful, Marco, thanks for sharing with us. |
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