Paper No. 346-7
Presentation Time: 2:30 PM
COASTAL SILICICLASTIC INFLUXES ENHANCING SEQUENCE STRATIGRAPHIC RESOLUTION: CASE STUDY FROM THE OLIGOCENE –MIOCENE OF THE ZAGROS, KURDISTAN, IRAQ
The Oligocene –Miocene sequence of the Zagros fold-thrust belt of Kurdistan region of NE Iraq is a carbonate-dominated sequence. The sequence is developed during a subdued tectonic episode of the Zagros foreland basin history. Integrated field investigations and microfacies analysis of this sequence shows that it is, generally, formed by shallow marine shelf to ramp setting with recognizable cyclic sequence. Correlation of the sequence cyclic pattern with global and regional eustatic curves of the same interval emphasizes a significant eustatic role especially of a third-order hierarchy. At the northeastern basin's margin, locations such as Golan and Ashdagh mountains of the Kurdistan region, displayed siliciclastic sediment influxes introduced into the coastal part of the basin during Early Miocene time. These sandy-clayey pulses intermixed with the carbonate sediments of the near-shore area during eustatic lowstands of lower ranking cycles. These minor mixed carbonate- siliciclastic cycles can be recognized at fourth and fifth-order cycles making sequence differentiation even better and enhancing sequence analysis resolution.