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Structural record of an oblique impact: the central uplift of the Upheaval Dome impact structure, Utah, USA
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
Most asteroids strike their target at
an oblique angle (Pierazzo & Melosh
2000). The common criterion for identifying
craters formed by an oblique impact
is the pattern of the ejecta blanket.
On Earth, however, ejecta ...
Measurement of calcite crystallographic-preferred orientations by magnetic anisotropy and comparison to diffraction methods
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
The anisotropy of magnetic susceptibility
(AMS) of rocks reflects the preferred
orientations of minerals. Therefore
AMS is a quick and easy way to
characterize rock fabrics (Hrouda 1982,Borradaile 1988); the obtained result ...
Holocene shield volcanoes in Iceland
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
Holocene shield volcanoes (lava shields)
are common in Iceland, but they are
restricted in space and time. As regards
space, most of the shield volcanoes
in Iceland occur within two bands
in the West and North Volcanic ...
Structural contacts in the Late Paleozoic accretionary wedge of central Chile and their tectonic significance for the evolution of the accretionary complex
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
The Chilean accretionary wedge is part
of a Late Paleozoic subduction complex
that developed during subduction of the
Pacific plate underneath South America.
The wedge is commonly subdivided
into a structurally lower Western ...
Structural control of fluid flow on a carbonate platform margin: an example from the Otavi Mountainland, Namibia
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
The present study focuses on the northwestern
OML, southwest of the mining
town of Tsumeb. The dominating structure
in this area is the NW-SE striking
Guinas Fault. The Guinas Fault is a
shear zone that divides an area, ...
Experimental study of the evolution of fault gouge in layered sand–clay sequences
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
This study focuses on clay smear processes
during fault gouge evolution in
sand-clay sequences at depths up to
2 km. A clay-rich fault gouge can dramatically
lower the fault’s permeability,
and prediction of this process ...
Crystal distribution patterns and their anisotropy behaviour in igneous rocks: towards an automated quantification, first results
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
Since approximately two decades fractal
geometry offers tools for the quantification
of rock fabrics, and new
methods are currently under development
to investigate the inhomogeneity
of crystal distributions, grain- ...
Discrimination of different volcanic rock units by magnetic properties — geothermal field at Reykjanes peninsula (SW-Iceland)
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
The geothermal field at Reykjanes
peninsula is located at the boundary
where the submarine Reykjanes Ridge
passes over into the rift zone of southwestern
Iceland. The geothermal field
coincides with a magnetic low in ...
Fossil overpressures compartments? A case study from the Eifel area and some general aspects
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
Fluid overpressures are well known from
hydrocarbon exploration in many sedimentary
basins. They can reach almost
lithostatic values, and may cause
the fracturing of rock. Fracturing allows
the discharge of fluid overpressure, ...
The timing of polyphase Miocene tectonics in Northern Romania
(
- 11. Symposium "Tektonik, Struktur- und Kristallingeologie"
, 2006-03)
This study addresses the polyphase
Miocene tectonic evolution in the
Maramures area (northern Romania) by combining field observations,
stratigraphic arguments and
fission-track analysis (Tischler et al.
in press). ...