About This Item
- Full text of this item is not available.
- Abstract PDFAbstract PDF(no subscription required)
Share This Item
The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract:
Structural
Profiles of the Western
Balkan-Forebalkan Region, Bulgaria
![Previous Hit](/data/images/arrow_left.gif)
![Next Hit](/data/images/arrow_right.gif)
By
Maxus Energy Corporation, 717 N.
Harwood St., Dallas, TX 75201
The Balkan Mountains and Fore-Balkan foothills of Bulgaria bisect the country laterally, separating the Moesian Platform in the north from the Srednagorian Plain and Rhodope Mountains in southern Bulgaria. The Balkan- Fore-Balkan thrust and fold belt evolved from a basin which begin with early Triassic intracratonic rifting. The basin was contracted by multiphase compression that propagated the Balkan-Fore-Balkan fold and thrust belt northward onto the southern edge of the Moesian Platform during the early Cretaceous (Aptian-Austrian phase), Paleocene (Laramian phase), and middle Eocene (Illyrian phase).
Two balanced cross
sections
of the western part of the
Balkan-Fore-Balkan province of Bulgaria presented here
illustrate the regional thrust-fold belt style of deformation.
Well, seismic, and surface mapping data were used in
construction of the
cross
sections
. The Balkan-Fore-Balkan
belt displays a narrow and thin foredeep. The foredeep
sediments are involved in the external structuring of the
belt. The northern limit of foreland deformation approximates
the southern edge of shelf sediments of the stable
Moesian Platform. North vergence of asymmetric anticlines
and thrusts predominates but local backthrusts are inferred
at Teteven Anticlinorium. Folded thrusts are indicated by
the data. Illyrian phase compression often includes out-of-sequence
thrusting and reactivation of pre-existing faults.
Angular unconformities between stratigraphic units locally
constrain the timing of deformation and can be projected
along strike.
Palinspastic reconstruction of the cross
sections
provide
a perception of the precursor basin. Previous investigations
have implied that inversion of basin-forming normal
faults was the predominate
structural
mechanism in the
Balkan-Fore-Balkan region. However, the available data
suggest low-angle thrust faulting is the prevalent style of
deformation. Total shortening is estimated to be 25.40%.
End_of_Record - Last_Page 44---------------