Structural patterns of the Lake Ercek Basin, eastern Anatolia (Turkey): evidence from single-channel seismic interpretation


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Toker M., Tur H.

MARINE GEOPHYSICAL RESEARCH, cilt.39, ss.567-588, 2018 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 39 Konu: 4
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1007/s11001-017-9333-4
  • Dergi Adı: MARINE GEOPHYSICAL RESEARCH
  • Sayfa Sayısı: ss.567-588

Özet

This study presents an analysis of the single-channel high-resolution shallow seismic reflection data from Lake Ercek, eastern Anatolia, to provide key information on the deformational elements, on the fault patterns and on the overall tectonic structure of the Lake Ercek Basin. High-resolution seismic data reveal major structural and deformational features, including N-S trending normal faults and W-E trending reverse faults bounding the Lake Ercek Basin, basement highs and folded structures along the marginal sections of the lake. The N-S trending normal faults asymmetrically control the steep western margin and the gentle eastern deltaic section, while the W-E trending reverse faults appear at the northern and southern margins. The N-S trending normal faults, half-graben structure, and the gradual thickening of sediments in the Ercek Basin toward the fault scarps strongly suggest an extensional tectonic regime resulting from an N-S compression. The Ercek Basin is an extension-controlled depocenter; it is a relatively undeformed and flat-lying deep Basin, forming a typical example of the half-graben structure. The N-S trending normal faults appear to be currently active and control the lake center and the E-delta section, resulting in subsidence in the lake floor. In the N- and S-margins of the lake, there is evidence of folding, faulting and accompanying block uplifting, suggesting a significant N-S compressional regime that results in the reverse faulting and basement highs along the marginal sections. The folding and faulting caused strong uplift of the basement blocks in the N- and S- margins, subsequently exposing the shelf and slope areas. The exposed areas are evident in the erosional unconformity of the surface of the basement highs and thinned sediments. The tilted basement strata and subsequent erosion over the basement block highs suggest prominent structural inversion, probably long before the formation of the lake. New high-resolution seismic data reveal the fault patterns and structural lineaments of the Lake Ercek and provide strong evidence for an ongoing extension and subsidence. The present study provides new structural insights that will support future tectonic and sedimentary studies and the development of strategies related to active earthquake faults and major seismic events in the region of Lake Ercek.

This study presents an analysis of the singlechannel
high-resolution shallow seismic reflection data from
Lake Erçek, eastern Anatolia, to provide key information
on the deformational elements, on the fault patterns and
on the overall tectonic structure of the Lake Erçek Basin.
High-resolution seismic data reveal major structural and
deformational features, including N–S trending normal
faults and W–E trending reverse faults bounding the Lake
Erçek Basin, basement highs and folded structures along
the marginal sections of the lake. The N–S trending normal
faults asymmetrically control the steep western margin and
the gentle eastern deltaic section, while the W–E trending
reverse faults appear at the northern and southern margins.
The N–S trending normal faults, half-graben structure, and
the gradual thickening of sediments in the Erçek Basin
toward the fault scarps strongly suggest an extensional tectonic
regime resulting from an N–S compression. The Erçek
Basin is an extension-controlled depocenter; it is a relatively
undeformed and flat-lying deep Basin, forming a typical
example of the half-graben structure. The N–S trending
normal faults appear to be currently active and control the
lake center and the E-delta section, resulting in subsidence
in the lake floor. In the N- and S-margins of the lake, there is
evidence of folding, faulting and accompanying block uplifting,
suggesting a significant N–S compressional regime that
results in the reverse faulting and basement highs along the
marginal sections. The folding and faulting caused strong uplift of the basement blocks in the N- and S- margins, subsequently
exposing the shelf and slope areas. The exposed
areas are evident in the erosional unconformity of the surface
of the basement highs and thinned sediments. The tilted
basement strata and subsequent erosion over the basement
block highs suggest prominent structural inversion, probably
long before the formation of the lake. New high-resolution
seismic data reveal the fault patterns and structural lineaments
of the Lake Erçek and provide strong evidence for an
ongoing extension and subsidence. The present study provides
new structural insights that will support future tectonic
and sedimentary studies and the development of strategies
related to active earthquake faults and major seismic events
in the region of Lake Erçek.