About This Item
- Full TextFull Text(subscription required)
- Pay-Per-View PurchasePay-Per-View
Purchase Options Explain
Share This Item
The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Block
in the Post-Miocene
1Manuscript received July 29, 1997;
revised manuscript received June 29, 1998; final acceptance January 10,
1999.
2University of Paris VI, Department
of Geotectonics, 4 Place Jussieu, B. 129, 75252 Paris 05, France; e-mail:
[email protected]
3University of Greenwich, School of
Earth Sciences, Chatham Maritime, Kent ME4 4TB, United Kingdom.
ABSTRACT
The 2-17-km-thick, post-Triassic sediments of
the Turan continental block
accumulated in a south-dipping basin characterized
by fault-controlled facies and thickness variations. Since the late Miocene,
the thickest part of the basin fill, on the southern margin of the Turan
block
, has been folded and uplifted as the Kopet Dag range, in response
to the Iran-Turan convergence. The Apsheron sill, which separates the northern
continental from the southern oceanic Caspian Sea basins, links the Kopet
Dag-Greater Balkan ranges (Turkmenistan) to the Caucasus (Azerbaijan).
The large-scale east-west- to west-northwest-east-southeast-oriented arrays
of periclinal folds of the Kopet Dag range, which indicate a north-south
oriented compression, were generated by a fault propagation mechanism.
The migration and accumulation of hydrocarbons has been controlled by the
deformation pattern. The 75 km of north-south shortening in the western
Kopet Dag-Greater Balkan area can be resolved into 70 km of pure compression,
orthogonal to the N120°-oriented Ashgabat fault, and 35 km of dextral
slip along this fault. The north-south Iran-Asia relative motion has produced
the oblique convergent northwest-southeast structures along the dextral
Ashgabat fault and the pure convergent east-west structures in the western
Kopet Dag-Greater Balkan region. The orientation of the structures has
been controlled by the angular relationship between the relative motion
of two blocks and the orientation of their boundaries. The Ashgabat fault
as a major crustal anisotropy has concentrated the deformation into a narrow
fold and thrust belt, whereas in the west the deformation is distributed
over a wider area. The pattern of deformation has been controlled by the
Iran-Turan boundary conditions.
Pay-Per-View Purchase Options
The article is available through a document delivery service. Explain these Purchase Options.
Watermarked PDF Document: $14 | |
Open PDF Document: $24 |
AAPG Member?
Please login with your Member username and password.
Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].