TITLE:
Structural Style in the Zagros Fold-Thrust Belt: The Gavbast Anticline, Coastal Fars
AUTHORS:
Hadi Vaseghi, Zahra Maleki, Mehran Arian
KEYWORDS:
Zagros, Iran, Gavbast Anticline, Fold Geometry, Razak Fault, Hendurabi Fault
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.2,
February
29,
2016
ABSTRACT: The Gavbast anticline is
located in the Coastal Fars area of the Zagros folded belt, with north-south
trend. The study anticline is restricted to the Bavush and Paskhand anticlines
from North, the Gezzeh and Dehnow anticlines from South, the Varavi anticline
from West and Nakh anticline from East (Figure 1). Description of fold geometry is
important because they allow comparisons within and between folds and
pattern-recognition in addition to occurrence and distribution of fold systems.
The main goal of this paper is to define folding style of the Gavbast anticline
and define structural features affected on them in the study area. In this
research, we used the Tectonics FP software, Global Mapper software and
geological maps and reports of Iranian National Oil Company. In addition, we
used common classification of fold for indicating of folding mechanism of the
Tabnak anticlinal structure. In the Gavbast anticline, fold style elements in
all parts of this anticline have been calculated and analyzed for indicating of
folding style mechanism. The results of this method have been shown the folding
geometry changes accurately. The Gavbast anticline is gentle in structural
sections D-D' and G-G' to K-K'. The anticline is an open fold in the L-L'section. Also fold type in the E-E' and F-F' sections of the
Gavbast anticline is steeply inclined sub-horizontal. These sections are
located between the Razak (western part) and Hendurabi fault (eastern part). It
seems that E-E' and F-F' parts in the Gavbast anticline have been suffered most
deformation affected by the Razak and Hendurabi faults. At the end of, it seems
that, the Razak and Hendurabi faults have major effects on folding style. This
structure is a very good sample for effect of strike slip faults on the folding
geometry and for this reason; the Gavbast anticline is considered a special
structural style in the Zagros fold-thrust Belt.