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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
Issue:
First Page:
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Title: Fault
in the Thrace Basin, Turkey--An Interpretation (1)
Author(s):
Abstract:
The North Anatolian fault
is a 1200-km-long major transform
fault
bounding the Anatolian plate on its north side. The
fault
formed during the late middle Miocene as a broad shear zone with a number of strands splaying westward in a horsetail pattern. Later, movement became localized along a central strand, and the southerly and northerly splays became inactive. The west-northwest-striking Thrace strike-slip
fault
system is one of these right-lateral, presently inactive, splays. It consists of three subparallel strike-slip faults. From north to south these are the Kirklareli, Luleburgaz, and Babaeski
fault
zones, which extend for about 130 km through the Thrace basin. The Thrace
fault
zone probably connected to the southeast with the presently active northern strand of the
North Anatolian
fault
in the Marmara Sea. To the northwest, the zone may have extended to the Plovdiv graben zone in Bulgaria.
The Cenozoic Thrace basin contains middle Eocene to Pliocene sedimentary rocks. The Thrace right-lateral wrench fault
system formed prior to the Pliocene and had become inactive by the Pliocene. Strike-slip
fault
zones with normal and reverse separation are detected by seismic reflection profiles and subsurface data. As the system became inactive, the motion on the North Anatolian
fault
zone began to be accommodated in the Marmara Sea region. Thus, the Thrace
fault
system represents the oldest strand of the North Anatolian
fault
to the west of Istanbul. Releasing-bend extensional structures and restraining-bend compressional structures are abundant along the
fault
zones. Several hydrocarbon-producing anticlines lie en echelon to the Luleburgaz
fault
zone. Regionally, the Thrace
fault
ystem has a horsetail shape, with the various strands becoming younger southward.
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