[meteorite-list] First Tunguska Meteorite Fragments Discovered

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Thu, 2 May 2013 08:09:30 -0700 (PDT)
Message-ID: <201305021509.r42F9UVb024540_at_zagami.jpl.nasa.gov>

http://www.technologyreview.com/view/514511/first-tunguska-meteorite-fragments-discovered/

First Tunguska Meteorite Fragments Discovered
The Physics arXiv Blog
May 2, 2013

Nobody knows what exploded over Siberia in 1908 but the discovery
of the first fragments could finally solve the mystery

The Tunguska impact event is one of the great mysteries of modern history.
The basic facts are well known. On 30 June 1908, a vast and powerful
explosion engulfed an isolated region of Siberia near the Podkamennaya
Tunguska River.

The blast was 1000 times more powerful than the bomb dropped on Hiroshima,
registered 5 on the Richter scale and is thought to have knocked down
some 80 million trees over an area of 2000 square kilometres. The region
is so isolated, however, that historians recorded only one death and just
handful of eyewitness reports from nearby.

But the most mysterious aspect of this explosion is that it left no crater
and scientists have long argued over what could have caused it.

The generally accepted theory is that the explosion was the result of a
meteorite or comet exploding in the Earth's atmosphere. That could have
caused an explosion of this magnitude without leaving a crater. Such an event
would almost certainly have showered the region in fragments of the parent body
but no convincing evidence has ever emerged.

In the 1930s, an expedition to the region led by the Russian mineralogist
Leonid Kulik returned with a sample of melted glassy rock containing bubbles.
Kulik considered this evidence of an impact event.

But the sample was somehow lost and has never undergone modern analysis.
As such, there is no current evidence of an impact in the form of meteorites.

That changes today with the extraordinary announcement by Andrei Zlobin from
the Russian Academy of Sciences that he has found three rocks from the
Tunguska region with the telltale characteristics of meteorites. If he
is right, these rocks could finally help solve once and for all what kind
of object struck Earth all those years ago.

Zlobin's story is remarkable in a number of ways. The area of greatest interest
for meteor scientists is called the Suslov depression, which lies directly beneath
the location of the air blast and is the place where meteorite debris was most
likely to fall.

Dig into the peat bogs here and you can easily find layers that show clear evidence
of the explosion. Zlobin said he dug more than ten prospect holes in the hope of
finding meteorite fragments, but without success.

However, he had more luck exploring the bed of the local Khushmo River, where
stones are likely to collect over a long period of time. He collected around 100
interesting specimens and returned to Moscow with them.

This expedition took place in 1988 and for some unexplained reason, Zlobin waited 20
years to examine his haul in detail. But in 2008, he sorted the collection and found
three stones with clear evidence of melting and regmalypts, thumblike impressions
found on the surface of meteorites which are caused by ablation as the hot rock falls
through the atmosphere at high speed.

Zlobin and others have used tree ring evidence to estimate the temperatures that the
blast created on the ground and says that these were not high enough to melt rocks on
the surface. However, the fireball in the Earth's atmosphere would have been hot enough
for this.

So Zlobin concludes that the rocks must be fragments of whatever body collided with
Earth that day.

Zlobin has not yet carried out a detailed chemical analysis of the rocks that would
reveal their chemical and isotopic composition. So the world will have to wait for this
to get a better idea of the nature of the body.

However, the stony fragments do not rule out a comet since the nucleus could easily
contain rock fragments, says Zlobin. Indeed he has calculated that the density of the
impactor must have been about 0.6 grams per cubic centimetre, which is about the same
as nucleus of Halley's comet. Zlobin says that together the evidence seems "excellent
confirmation of cometary origin of the Tunguska impact."

Clearly there is more work to be done here, particularly the chemical analysis perhaps
with international cooperation and corroboration.

Then there is also the puzzle of why Zlobin has waited so long to analyse his samples.
It's not hard to imagine that the political changes that engulfed the Soviet Union in
the year after his expedition may have played a role in this, but it still requires
some explaining.

Nevertheless, this has the potential to help clear up one of the outstanding mysteries
of the 20th century and finally determine the origin of the largest Earth impact in
recorded history.

Ref: arxiv.org/abs/1304.8070: Discovery of Probably Tunguska Meteorites at the Bottom
of Khushmo River's Shoal
Received on Thu 02 May 2013 11:09:30 AM PDT