In order to understand the tectonic evolution of the Kalecik region
(Ankara, Turkey), a structural field study was performed in a selected
area located in the east of Kalecik, where mostly imbricated thrust sheets
of the Cretaceous Ophiolitic melange crop out. In the study area, the
Cretaceous Ophiolitic melange, Cretaceous radiolaria-bearing sequences
and the Paleocene units are all intruded by sub-vertical dykes. The
attitudes of planar structures (dykes, beds and faults) and the kinematic
data measured on faults were analyzed by using &ldquo / ROCKWORKS 2002&rdquo / and &ldquo / Angelier Direct Inversion Method (version 5.42)&rdquo / softwares,
respectively.
A major trend of NE-SW (045° / N) direction and relatively a post-Paleocene
&ndash / pre-Miocene age was determined for the dykes indicating an extension
in the NW-SE direction during post-Paleocene. The dykes cut bedded
units displaying a dominant set trending in WNW-ESE (297° / N) direction
and mostly dipping towards NE with moderate dip amounts. But at the
same time, the Upper Cretaceous units were observed as intensely folded, faulted and thrusted due to the compressional regime that acted
in Central Anatolia during Late Cretaceous. The angular difference
between the major trend of dykes and the dominant trend of stratification
was found as approximately 108° / ., which may also indicate that the
dykes and beds were evolved during different deformation periods.
The results of the kinematic analyses of different age faults revealed that
the post-Paleocene &ndash / pre-Miocene Kalecik basaltic dykes are deformed
under a continuous NW-SE-oriented post-Paleocene compressional to
strike-slip tectonic regime which was followed by a NNW-SSE oriented
post-Miocene extensional-transtensional regime.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/3/12611955/index.pdf |
| Date | 01 May 2010 |
| Creators | Kasimoglu, Pinar |
| Contributors | Rojay, Bora Fuat |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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