TECTONO - SEDIMENTARY EVOLUTION OF BUCAKKIŞLA REGION (SW KARAMAN) IN CENTRAL TAURIDES

Year 2014, Volume: 148 Issue: 148, 19 - 42, 01.06.2014

Tolga Esirtgen

https://doi.org/10.19111/bmre.19762

Cited By: 2

Abstract

The study
area located in Bucakkıflla region in Central Taurides consists of rock units
of the melange which form Bozkır unit of the Tauride units and the overlying
cover rocks. There are volcanic, ophiolitic and sedimentary rocks which
generated in different environmental conditions. These rock groups comprise
units which formed in MiddleUpper Triassic-Paleocene periods in Inner Tauride
Ocean that had been opened between Tauride – Anatolide continents. Within the
scope of this study, lithostratigraphic characteristics of Hu¤lu, Boyalı hill,
Korualan nappes and cover rocks which form Bozkır Unit and tectono sedimentary
evolution of the study area was built up by paleontological and structural
features. Due to rifting, which started in Middle Upper Triassicin the region,
the products of the rift volcanism in rifting center and the carbonate
deposition on margins of basin have occurred. The continuation of extension
which initiated rifting caused collapse in the basin in Middle Upper Triasic –
Lower Senonian. Deep marine deposition has occurred at the center of basin,
however pelagic and neritic limestones were deposited in basin margins during
this time. The region has become compressed by the effect of a new tectonical
regime which had been effective starting from Santonian. This compression
caused new melanges to take place due to reverse faults and thrust. The
formation of these melanges has continued until the end of Paleocene period.
However, there has not been observed any formation depending on the compression
in post Paleocene. The nappes have moved southward by the effect of compression
until Eocene. But then, these nappes could not advance forward anymore so,
northward back thrusts took place as basin was closured andreached the
collisional stage. Sequences which had become imbricated structures by back
thrusts were subjected to collapsing by the stop of compression and the
gravitational effect. All sequences in the imbricated structure were cut by dip
slip normal faults and lacustrine basins were formed on fallen blocks. The
formation of Early Oligocene terrestrial deposits in these lakes indicates that
the collapse occurred in Oligocene or immediately before this time, and this
allows the dating of new tectonical period. Early Oligocene deposits to become
tilted by dip slip faults show that new tectonic period in the region has also
continued after Oligocene.

Keywords

Bozkır unit, mélange, Inner Tauride Ocean, rift volcanism, orogenic collapse

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