List of Articles Calcareous nannofossil

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Calcareous nannofossils from chalky limestone intervals of the Abderaz formation in the Kopet Dagh range, NE Iran
  Somayeh Sanjary Fatemeh Hadavi Marziyeh Notghi Moghaddam Mohsen Allameh
  10.30495/ijes.2019.544594
  Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Biostratigraphy and paleoecology of Cretaceous rocks based on calcareous nannofossil in Sarayan section, East Iran
  Fatemeh Hadavi Marziyeh Notghi Moghaddam Lida Khodadadi
  Calcareous nannofossil assemblages recovered from a long, continuous section have been described from the Sarayan region in Lut Block in east Iran. The marine Upper Cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assem More

  Calcareous nannofossil assemblages recovered from a long, continuous section have been described from the Sarayan region in Lut Block in east Iran. The marine Upper Cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assemblages. A structural analysis of Upper Cretaceous calcareous nannofloras has revealed 30 nannofossil species. A revised zonation for the Cretaceous is used to subdivide the Cretaceous deposits in this section into five zones (CC21-CC25). Finally, the paleoecological applications of Upper Cretaceous nannofossils are considered in this section. Surface water temperature, productivity, and fertility are believed to have been the principal factors controlling species distribution. Warm water indicators such as Uniplanarius sissinghii, Uniplanarius trifidus, and Micula murus suggest warm surface water conditions in the studied thickness. In the Sarayan section, based on Lithraphidites carniolensis and Watznaueria barnesae, lower fertility conditions with low productivity at the Campanian to Maastrichtian were suggested for this region.    Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Nannostratigraphy of Upper Cretaceous Sediments Northern Slopes of Central Alborz
  آذین Ahifar انوشیروان Kani معصومه Noori
  Taking into account the extent of upper cretaceous deposits of Alborz region, determination of stageboundaries within the successions at different parts of the basin by the use of calcareous nannoflora wasput on the agenda. Two stratigraphic sections viz. Alamde galandr More

  Taking into account the extent of upper cretaceous deposits of Alborz region, determination of stageboundaries within the successions at different parts of the basin by the use of calcareous nannoflora wasput on the agenda. Two stratigraphic sections viz. Alamde galandrud and Pol e zoghal were sampled atpredetermined intervals. back to the laboratory, the samples were prepared using gravity settlingtechnique and the resulting thin sections.The nannofloral assemblage of the upper cretaceous rocks of northern Alborz region reveal coniacianmaastrichtian age at Pol e zoghal (west) and campanian-early paleocene age at Alamde galandrud (east).moreover, the region was situated at low paleolatitudes and experienced a low marginal environment ofdeposition at the said time. the outcomes of nannostratigraphic investigations carried out in Pol e zoghalsection along with the resalts of earlier studies in Alamde galandrud reveals that during the latecretaceous times the depositional center of the basin was lacated on the west and gradually shiftedtowards east. (i.e. sedimentation started earlier in the western parts and lasted longer in the eastern partsof the basin during late cretaceous times.) Manuscript profile