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A new approach to the paleoecological relationship between rudists and benthic foraminifers in Maastrichtian of Tethys basin in the Central Zagros, Iran

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Abstract

The paleoecological relationship between rudist and foraminifera fossil faunas in tarbur Formation of Tethys basin deposits in Zagros mountain range has been studied by field measurements and microscopic thin-section laboratory. The presence of foraminifera is very weak in reef layers of these deposits that considering the rich rudist fossil fauna. Foraminifera are found with high frequency in the fore reef, back reef, and lagoon facies. However, in reef formations, foraminifera are very weak and rarely present. Of course, sometimes, they may be transported to the reef by sea waves and currents, and because the structure of the reef is very porous, so they are trapped inside the cavities and remain there. Rudists have been identified in Tarbur Formation that proves the Maastrichtian age. Oligotrophic foraminifers’ genera are abundant in the Maastrichtian that disappears with changing environmental conditions to Eutrophic or Mesotrophic. These environmental conditions were very favorable for rudists and agglutinin foraminifera. The results demonstrate that foraminifera are very rare in abundant rudist fossils parts. It can be deduced the foraminifer larvae feeds to rudists due to the suspension-feeding and reducing the number of them near the rudistic reefs. The eutrophic rudists living environment has been accounted for high volumes of food by suspension-feeding of them, thereby reducing food and foraminifera population has been declining. Rudists have been disposed of a high volume of fecal to the environment. The composition of seawater has been changing and live in such places has been difficult to foraminifera caused by exit this waste.

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Correspondence to Borzu Asgari-Pirbalouti or Mohammadsadegh Dehghanian.

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Asgari-Pirbalouti, B., Dehghanian, M. A new approach to the paleoecological relationship between rudists and benthic foraminifers in Maastrichtian of Tethys basin in the Central Zagros, Iran. Carbonates Evaporites 37, 32 (2022). https://doi.org/10.1007/s13146-022-00774-5

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