JOURNAL OF THE BALKAN GEOPHYSICAL
SOCIETY, Vol. 2, No 1, February 1999, p. 15-29, 14 figs.
Possibility of deep
gabbroic rocks, east of Tuz Lake, central Turkey,
A.Ü., Fen. Fak., Jeofizik Müh. Böl.,
Besevler 06100, Ankara, Turkey
(Received 17 September 1998; accepted
20 October 1998 )
Abstract: In the east of Tuz lake,
gabbroic rocks are observed as small outcrops from the surface geology.
Regional aeromagnetic data measured by the Canadian Aero Service
(CAS) show strong anomalies in the region. Gabbroic rocks are the
only magnetized rocks in the region. However, surface exposures
of the gabbroic rocks do not seem to have adequate size and extension
to explain such magnetic anomalies of high amplitudes.
High-and low-pass filtered aeromagnetic anomalies
were calculated by using the cut-off wavenumbers obtained from the
azimuthally-averaged power spectra. Two-dimensional models were
constructed from the high and low-pass filtered anomalies with the
control of the power spectrum depth estimates. The two-dimensional
model produced from the low-pass filtered anomalies suggests the
existence of a conical shaped, deeply buried, body. The bottom of
the body extends down to deeper levels of the upper crust. Pseudogravity
anomalies and maxima of the horizontal gradient of the low pass-pass
filtered anomalies were produced. A three-dimensional model was
also constructed by employing an automated method. This model resembles
the two-dimensional model produced from the low-pass filtered anomalies.
Key Words: Gabbroic Rocks, Aeromagnetic
Data, Central Turkey