Abstract
Sequence stratigraphic evidences have been used in this research to investigate the stratigraphic correlation of cretaceous paleogene succession in Shiraz area, Fars, SW Iran. For this purpose, 4 stratigraphic sections have been chosen and provided. According to petrographic study and field evidences, 4 depositional sequences were identified including the Tarbur, Sachun and Jahrum formations in the east and the Gurpi, Pabadeh and Asmari formations in the west of study area. After identifying the boundaries and systems tract facies, it has been found that the mentioned formations have been deposited among the continuous/discontinuous boundaries in an equivalent manner. In this case, the purple shale (between the Gurpi and Pabdeh formations) could be considered equivalent to the upper part of the Sachun formation. From the point of Paleogeography, the plat-form sedimentary environment covered almost the whole area during the Oligo-Miocene age, so that the Asmari formation would have been deposited, which is marked by sharp contact as disconformity on Jahrum formation in the east of the basin and with continuous contact (C.C) on the Pabdeh formation in the west and southwest.
Highlights
Upper cretaceous sediments in study area cover two formations: Gurpi and Tarbur
In the west of study area CTB recognized with purple shale (SB2) and in the east of study area this contact was investigated by clastic facies (SB1)
Sedimentary environments models and sequence stratigraphy evidences 3 depositional model based on relative sea level change are presented during CTB time in study area
Summary
Upper cretaceous sediments in study area cover two formations: Gurpi and Tarbur. Paleogene sediments in the Shiraz region cover four formations: Sachun, Jahrum, Pabdeh, and Asmari. The mentioned formations are expanded over the studied area with a petrological variety of marl, limestone, dolomite, dolomitic limestone and evaporate rock with different thicknesses [1]. The sequence stratigraphic evidences have been applied in this research to study the stratigraphic conformity and correlation of the formations in the upper cretaceous—paleogene time frame. Such studies would have application in paleogeography and the evolution of the Zagros sedimentary basin in this period
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