ABSTRACTS / RESUMES - Comitato Glaciologico Italiano

etter historical data and field observation, whilst methods
of modelling and analysis are required to improve the understanding
of the processes and mechanisms involved.
The research objectives are focused on:
1. the development of criteria for the recognition of landslides
including the publication of the book «Landslide
Recognition»;
2. the reconstruction of past distributions of landslide incidents
related to the change of various climate parameters;
3. the development of qualitative landslide evolution models
and a hydrological and slope stability framework for
the prediction of landslide activity evolved at test sites.
After the presentation of the main contents of the publication
«Landslide Recognition», results and remaining problems
of climatic and dynamic inferences from dated landslides
and relationships between landslides and climatic
conditions are discussed for different regions in Europe.
Special emphasis will be given to the reliability of historical
information from dated landslides and to the holocene
landslide time series in relation to the question if the landslide
carry a clear climatic signal.
In a second part the use of hydrological and slope stability
models are discussed in terms of their contribution to a
better understanding of the relationship between the frequency
of the occurrence of landslides and precipitation
patterns in the past. The project results show that this depends
strongly on the landslide type and the frequency
spectrum through time.
In the third part selected test sites are presented to evaluate
the stability of future climatic change scenarios using
coupled hydrological and slopes stability models. The results
are related (1) to the evaluation of several hydrological
and slopes stability models, (2) to the selection ofspecific
hydrological and stability models and (3) to the discussion
of downscaled results of global circulation models
(Gem) (see contribution of Dehn and Burna).
The results presented are related to different test sites in
France, Italy and Britain. In a final statement a summary of
the results and outstanding problems will be given.
YILDIRIM DILEK 1 , DONNA L. WHITNEy2 & OKAN TEKELI 3
Neotectonics and geomorphology of
South-Central Turkey: effects of orogenic collapse
in an alpine collision zone
1Department of Geology, Miami University, Oxford, OH 45056, U.S.A.
2 Donna L. Whitney, Department of Geology,
University of North Carolina, Chapel Hill, NC 27599, U.S.A.
3 Okan Tekeli, Department of Geological Engineering,
University of Ankara, Ankara 06100, Turkey
The neotectonic evolution of south-central Turkey represents
a classic example of orogenic collapse of tectonically
thickened continental crust, and is controlled by an interplay
of tectonic extension and strike-slip faulting starting
in Oligo-Miocene time. The current geomorphology of this
region is characterized by an «ova» regime, which consists
of large, roughly equant complex basins (ovas) and a number
of dispersed volcanic cones. Emplacement of Neo­
Tethyan ophiolite nappes onto platform carbonates in the
Late Cretaceous and subsequent crustal imbrication and Svergent
thrusting within the Anatolide-Tauride realm in
the Early Tertiary were responsible for crustal thickening,
high TIP metamorphism, and topographic build-up prior
to the onset of the neotectonic phase in the region. The
Nigde metamorphic massif (Nmm), north of the Inner­
Tauride suture zone, is an isolated crystalline dome with a
plastically deformed high-grade metamorphic and plutonic
basement overlain by an unmetamorphosed sedimentary
lid, and represents a Cordilleran-type metamorphic core
complex. Unroofing of Nmm as a core complex was facilitated
by erosional and tectonic exhumation in the upper
plate of a N-dipping subduction zone in Cenozoic time.
The Bolkar massif in the south is part of the parautochthonous
Tauride carbonate platform and has experienced
asymmetric uplift along a steeply N-dipping frontal normal
fault in the northern foothills of the Bolkar Mountains.
The fault zone is marked by a several-m-thick mylonitic
breccia which contains ophiolite and carbonate material
and down-to-the-north shear sense indicators. The rugged
topography of the Bolkar Mountain range, with a high elevation
of >3.5 km, is a manifestation of this rapid uplift in
the Oligo-Miocene and subsequent glaciation in the Plio­
Pleistocene epoch. TheUlukisla basin between the Nmm
and the Bolkar massif represents a peripheral foreland basin
developed along theInner-Tauride suture zone during
and after the closure ofthe Inner-Tauride branch of the
Neo-Tethys and contains U. Cretaceous-U.Eocene marine
strata overlain by Oligo-Miocene lacustrine and Miocene­
Pliocene terrestrial deposits. The presence of several unconformities
and distal depocenters in the Oligo-Miocene
and younger strata and a corrugated backshed topography
along the Nigde detachment fault suggests a supra-detachment
evolution of the Ulukisla sedimentary basin in the late
stage. The sinistral Tertiary Ecemis fault zone truncates
the Bolkar massif and the Ulukisla basin on the east and
contains Oligo-Miocene and younger fluvial and lacustrine
deposits. The left-lateral slip along the Ecemis fault zone
has accommodated both tectonic extension in the upper
plate of the detachment fault along Nmm and internal
deformation within the westward moving Anatolian wedge.
Crustal deformation and orogenic collapse along the
southern margin of the central Anatolian crystalline complex
further north in the detachment hinterland was taken
up mainly by strike-slip faulting along NW-(dextral) and
Nli-Isinisrral) trending lineaments. A number of historically
active composite volcanoes (i.e., Hasan, Erciyes) that
consist of alkaline to calcalkaline lavas and pyroclastic
rocks evolved along andlor at the intersections of transtensional
strike-slip fault systems in this regime during the La-
149