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| 1 | Biostratigraphy and Sequence Stratigraphy of the Gurpi Formation at Deh Dasht Area, Zagros Basin, SW Iran显示文摘A rich assemblage of planktonic foraminifera has been studied from an outcrop of the Gurpi Formation, the hydrocarbon source rock in the southwest Iran, Deh Dasht area(Kuh-e Siah anticline). Based on the distribution of the planktonic foraminifera, eight biozones have been recognized that included:Dicarinella concavata Interval Zone(Earliest Santonian), Dicarinella asymetrica Total Range Zone(Santonian to Earliest Campanian), Globotruncanita elevata Partial Range Zone(Early Campanian), Globotruncana ventricosa Interval Zone(Middle to Late Campanian), Radotruncana calcarata Total Range Zone(Late Campanian), Globotruncanella havanensis Partial Range Zone(Late Campanian), Globotruncana aegyptiaca Interval Zone(Late to latest Campanian), Gansserina gansseri Interval Zone(Latest Campanian to Early Maastrichtian). These biozones indicates that the Gurpi Formation deposited during the Early Santonian- Early Maastrichtian. These biozones are compared to the most standard biozones defined in Tethysian domain. Based on distribution of morphotype groups of planktonic foraminifera, planktonic to benthic ratio(P/B) and content of carbonate, nine third-order sequences are recognized. | Mahboobeh FEREYDOONPOUR Hossein VAZIRI-MOGHADDAM Azizollah TAHERI | 2014 | Acta Geologica Sinica(English Edition)2014，88，6： | 2 |
| 2 | The Maastrichtian-Danian in the SW Zagros Fold-Thrust Belt(S. Iran):An Integration of Planktonic Foraminiferal Biostratigraphy and Gamma-Ray Spectrometry显示文摘In this study, the Maastrichtian-Danian boundary was measured and sampled in two stratigraphic sections, the north and south flanks of the Dehnow anticline in Coastal Fars, Southern Iran. This boundary was also investigated in the drilled exploratory well-1 in the same region. The lithology of the Maastrichtian-Danian deposits consists of glauconitic, phosphatic argillaceous limestones and marlstones. 30 genera and 77 species of planktonic foraminifera have been determined. The recognized biozones are the Gansserina gansseri Interval Zone, and the Contusotruncana contusa Interval Zone, which indicates latest Campanian to middle Maastrichtian age for the upper part of the Gurpi Formation. In addition, the Eoglobigerina edita(P1) Partial Range Zone, Praemurica uncinata(P2) Lowest Occurrence Zone, Morozovella angulata(P3) Lowest Occurrence Zone and Globanomalina psudomenardii(P4) Taxon Range Zone represent a Danian to Thanetian age for the lower part of the Pabdeh Formation. From the absence of the Abathomphalus mayaroensis Interval Zone, Pseudoguembelina hariaensis Interval Zone, Pseudotextularia elegans Interval Zone, Plummerita hantkeninoides Interval Zone, Guembelitria cretacea(P0) Partial Range Zone and Parvularugoglobigerina eugubina(Pα) Total Range Zone, it can be deduced that there is a paraconformity across the Maastrichtian–Danian boundary in the studied area, this hiatus encompassing the late Maastrichtian and the earliest Danian. Danian deposits from the study area contain reworked glauconitized macrofossils, planktonic and benthic foraminifera of the Cretaceous. The obtained surface gamma-ray spectrometry logs resemble the exploratory well-1 gamma-ray wireline log. | Abdolreza MOGHADDASI Hossein VAZIRI-MOGHADDAM Ali SEYRAFIAN | 2020 | Acta Geologica Sinica(English Edition)2020，94，5： | 1 |
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