Three main stages have been
distinguished in the Neogene-Quaternary morphotectonic evolution in the East
Marmara region. They are Early-middle Miocene, Late Miocene-Pliocene and Latest
Pliocene-Present. Three different sedimentary sequences, each overlies the
other with an angular uncomformity, have been formed in these stages.
Early-middle Miocene sedimentary sequence is characterised by continental
detritics whereas the Late Miocene-Pliocene rocks are represented by
continental to marine transitional sediments. Terrestrial-marine sediments have
been deposited since the latest Pliocene till Present. The region was
transformed to denudational area by the closure of the Intra-Pontid Ocean in
the end of the Oligocene and it was under the effect of paleotectonic events
during the early-middle Miocene. In the end of this erosional period which
lasted until the end of middle Miocene, a peneplain morphology covering large
area was formed and terrestrial sediments were deposited. Neotectonics which has
affected actual geology in the region, initiated in the beginning of late
Miocene and occurred in two stages which differ tectonic styles. In the late
Miocene-Pliocene time, the region was affected by N-S directed compressional
regime and it was uplifted by NE-SW and NW-SE trending strike-slip faults with
E-W lying folds as a result of this compression. During this stage, a Late
Miocene-Pliocene sedimentary sequence which starts with fluvial sediments at
the bottom and passes into lacustrine to marine at the top, was deposited. In
the end of the period, depressions in which late MiocenePliocene sediments were
deposited, were spread out and the region was formed as a denudational area in
the late Pliocene. The second stage of the neotectonic period covers a time
interval from the Latest Pliocene to Present and it begun with the occurrence
of the North Anatolian Fault. Actual morphology and active tectonic frame of
the Eastern Marmara region were developed in this time interval which is known
with the transform character of the North Anatolian Fault. However, structural
evolution of actual Marmara sea region which is related to North Anatolian
Fault, initiated in Latest Pliocene.
Birincil Dil | İngilizce |
---|---|
Konular | Mühendislik |
Bölüm | Makaleler |
Yazarlar | |
Yayımlanma Tarihi | 1 Ocak 1998 |
Yayımlandığı Sayı | Yıl 1998 Cilt: 120 Sayı: 120 |
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