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| Titel |
Evolution of ancient Lake Ohrid: a tectonic perspective |
| VerfasserIn |
N. Hoffmann, K. Reicherter, T. Fernández-Steeger, C. Grützner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 10 ; Nr. 7, no. 10 (2010-10-29), S.3377-3386 |
| Datensatznummer |
250005030
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| Publikation (Nr.) |
 copernicus.org/bg-7-3377-2010.pdf |
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| Zusammenfassung |
| Lake Ohrid Basin is a graben structure situated in the Dinarides at
the border of the Former Yugoslavian Republic of Macedonia (FYROM) and
Albania. It hosts one of the oldest lakes in Europe and is
characterized by a basin and range-like geological setting together
with the halfgraben basins of Korca, Erseka and Debar. The basin is
surrounded by Paleozoic metamorphics in the northeast and north and
Mesozoic ultramafic, carbonatic and magmatic rocks in the east,
northwest, west and south. Paleocene to Pliocene units are present in
the southwest. With the basin development, Neogene sediments from
Pliocene to recent deposited in the lows. There are three major deformation
phases: (A) NW–SE shortening from Late
Cretaceous to Miocene; (B) uplift and diminishing compression during
Messinian – Pliocene; (C) vertical uplift and (N)E–(S)W extension from
Pliocene to recent led to the basin formation. Neotectonic activity of the study area
concentrates on N–S trending normal faults that bound the Ohrid Basin
eastwards and westwards. Seismic activity with moderate to strong events
is documented during the last 2000 yrs; the seismic hazard level is
among the highest in Albania and Macedonia. Activity of the youngest
faults is evidenced by earthquake data and field
observations. Morphotectonic features like fault scarps,
a stepped series of active normal faults, deformed paleosols, a wind gap and
fault-related hydrothermal activity are preserved around Lake Ohrid
and allow delineating the tectonic history. It is shown that the Lake
Ohrid Basin can be characterized as a seismogenic landscape. This
paper presents a tectonic history of the Lake Ohrid Basin and
describes tectonic features that are preserved in the recent
landscape. The analysis of morphotectonic features is used to derive
the deformation history. The stratigraphy of the area is summarized
and concentrates on the main units. |
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