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mybb@mybb.ru (Dimych) — Sat, 27 Jun 2009 23:22:31 +0400

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meteorites, impact, cosmic dust, cretqceous-paleogen boundary, event,

mybb@mybb.ru (��) — Fri, 16 May 2008 22:34:16 +0400

meteorites, impact, cosmic dust, cretqceous-paleogen boundary, event,
spherules

Cosmic Dust and Micrometeorites in the Transitional Clay Layer

mybb@mybb.ru (��) — Fri, 16 May 2008 22:29:39 +0400

��at the Cretaceous�Paleogene Boundary in the Gams Section
(Eastern Alps): Morphology and Chemical Composition

INTRODUCTION
Investigations of cosmic dust in sedimentary rocks
were inspired by the results of the H.M.S.
Challenger
cruise, during which traces of cosmic matter were discovered
for the first time in red deep-sea clays [Murray
and Renard, 1891]. Samples of ferromanganese nodules
and magnetic microspherules up to 100

m in
diameter, which were later called cosmic spherules,
were uplifted from a depth of 4300 m during the dredging
at two stations in the southern Pacific. However, the
iron microspherules gathered by
Challenger
were
studied only in recent years. It was found out that
internal parts of the spherules consist of metallic iron
(90%) and nickel (10%), whereas their surfaces are
covered by thin crusts of iron oxide [Jedwab,
http://www.ub.ac.be/sciences/cosmicdust.pdf].
In fact, the study of cosmic matter was initiated by
the discovery of cosmic spherules in deep-sea clays.
However, this problem excited great interest of
researchers only after first launches of cosmic vehicles
that could sample lunar ground and dust particles in
various regions of the solar system. Studies of the Tunguska
catastrophe traces and meteoritic dust sampled in
the place of the fall of the Sikhote-Alin� meteorite also
played an important role [Florensky, 1963; Florensky
et al., 1968; Ivanov and Florensky, 1970; Krinov,
1971].

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Cosmic Dust and Micrometeorites in the Transitional Clay Layer

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