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Introduction
Location Topography Geology
The Megablock Abandoned Quarry
Selection of Polymictic Breccia Cuts and
Thin Sections; SEM-EDS Analyses; Raman
Spectroscopy. Coesite High-pressure (2-3…
GP ) SiO2 P l h
Discussion and conclusion
The enigmatic Luzice (Most, Czech Republic) melt rock megabreccia occurrences: evidence of low-altitude
airburst impact relics
Kord Ernstson, Jens Poßekel, Karel Ventura, Martin Molnár
University of Würzburg, Würzburg, Germany, kernstson@ernstson.de, Geophysik Poßekel Hornhof 14, 45479 Mülheim, Mülheim/Ruhr, Germany, University of Pardubice, Czech Republic,
Pardubice, Czech Republic, Resselovo nám. 76, Chrudim 537 01, Chrudim, Czech Republic
About 70 km northwest of Prague (Fig. 1), mining in
an abandoned quarry has exposed a quarry face
whose rocks and material composition are a geologic
mystery. It is a block about 100-200 m in size, located
on the margin of the Tertiary Paleogene-Neogene
volcanic province of the Bohemian Massif within the
extensive Upper Cretaceous deposits. The block
represents a megabreccia, and its variegated
components include minor layered complexes,
polymict breccia bodies, and intercalated slag-like
Fig. 3. Section of the geological general map 1 : 500,000 of
Geologic general overview
The discussion must begin with the fundamental
misinterpretation of geology and geologists regarding
the formation of the porcellanite deposit in the Most-
Luzice area. This misjudgement can be understood
from the geological point of view of earlier studies.
The starting point is the obvious compulsion of
geologists to assume two separate seams in the
lignite basin, one that continues to be mined at depth
and an upper seam of which no trace, not even the
slightest, remains. This results in a construct that is
geologically completely misleading and is based on
the burnt and sintered claystones and sandstones of
the porcellanite deposits on the surface. It cannot be
otherwise: Where does the extreme heat to form the
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