ÇAĞRILI KONUŞMALAR / KEYNOTES Invited Speeches ... - TPJD

Clastic-Carbonate Facies of Çaybağı Formation (Late Miocene-Early Pliocene),
Eastern Elazığ, Eastern Turkey
Calı̇be Koç Taşgin 1 , İbrahı̇m Türkmen 2
1 Fırat University, Geological Engineering Department, Elazığ
2 Balıkesir University, Geological Engineering Department, Balıkesir
The Çaybağı Formation located between Çaybağı and Kovancılar (eastern Elazığ) comprises fluvial
and lacustrine deposits. Fluvial deposits are represented braided and low sinuosity river facies.
The braided river deposits is characterized by parallel bedded conglomerate, planar cross-bedded
conglomerate, planar-trough cross-bedded sandstone, low-angle cross bedded sandstone,
parallel laminated sandstone and massive red mudstone. The low-sinuosity river deposits consist
of parallel bedded conglomerate, planar-trough cross-bedded conglomerate, planar-trough
cross-bedded sandstone, ripple-cross laminated sandstone, parallel laminated sandstone,
sitstone, carbonaceous mudstone, massive red mudstone, gray claystone, clayey limestone and
turba. The gray claystone and clayey limestone contain freshwater ostracods, gastropods and
pelecypods. Lacustrine deposits compose of three main facies associations. These are delta,
shallow lacustrine and open lacustrine. The delta deposits were grouped into subassociations;
delta top, delta front and prodelta (open lacustrine). Facies in delta top subassociation are
represented by parallel bedded conglomerate, planar-trough cross-bedded sandstone as channel
deposits, parallel laminated sandstone, siltstone as levee deposits, red mudstone, gray claystone
as flood plain deposits, clayey limestone as ponded water and carbonaceous mudstone and peat
as swamp deposits. Two type of delta front subassociation were recognised; gilbert-type delta
front subassociation and mouth-bar type delta front subassociation. Facies in the gilbert-type
delta front subassociation are represented by parallel bedded conglomerate, parallel laminated
sandstone as topset deposits, large-scale cross-bedded conglomerate up to 5 m thick as foreset
deposit and low-angle cross bedded conglomerate, planar cross-bedded sandstone, parallel
laminated sandstone as bottomset deposits. The mouth-bar type delta front deposits compose
of parallel bedded conglomerate, planar-trough cross-bedded conglomerate, planar-trough
parallel laminated sandstone and siltstone. The shallow lacustrine environment is represented
by parallel laminated sandstone, siltstone, carbonaceous mudstone, gray claystone, clayey
limestone, marl and turba. Fine-grained facies such as carbonaceous mudstone, gray claystone,
clayey limestone, marl in this margin environment contain abundant ostracod, gastropod,
pelecypod and charophytes fossils. The peats ovelie the carbonaceous mudstone and clayey
limestone. There are rhizolits in the carbonaceous mudstone, clayey limestone near their upper
contact with the peat. The clayey limestone contains abundant leaves and other plant fossils. The
offshore lacustrine deposits consist of carbonaceous mudstone, gray claystone, clayey limestone
and marl. These lithofacies contain poorly preserved fosil remains, freshwater ostracods and rare
freshwater gastropod.
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