Calcareous nannofossil biostratigraphy and paleoenvironment of the Eocene–Oligocene interval in the Pabdeh Formation in southwestern Iran

Senemari, Saeedeh; Mejía-Molina, Alejandra

doi:10.1007/s00531-022-02180-7

Cited by 4 publications

(1 citation statement)

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“…In this study, nannofossil identified from the 45 selected samples were classified into 25 genera and 47 species (Table 3 Small placoliths are a good indicator of environmental conditions rich in nutrients in carbonate complexes (Okada, 2000;Aizawa et al, 2004) Helicosphaera, Umbilicosphaera and Discoaster are usually used to mark the neritic zone (Aizawa et al, 2004) The dominant Discoaster characterizes warm conditions (Pratiwi & Sato, 2016;Shepherd et al, 2021;D'Onofrio et al, 2021;Schneider et al, 2013). Zygrhablithus bijugatus indicated in low nutrient with open ocean envirotment (Gibbs et al, 2016;Fioroni et al, 2015), Reticulofenestra umbilica is temperate taxa (Bordiga et al, 2015;Senemari & Mejía-Molina, 2022). Umbilicosphaera is known as a tropical oligo taxon.…”

Section: Nannofossil Assemblagesmentioning

confidence: 99%

Middle Eocene Nannofossil Assemblages Responding to Depositional Dynamics of the Elat Formation, Maluku

Ratumanan,

Isnaniawardhani,

Muljana

2023

Geocelebes

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The Kei Besar Island is mainly composed of the Elat Formation carbonate rocks. This research was conducted to determine the nannofossils assemblages in the Elat Formation to interpret the depositional dynamics during its formation. Lithological observations and sampling for nannofossil analysis were carried out on three measured stratigraphic sections: Section 1 - Hollat, Section 2 - Ngurdu, and Section 3 - Mata Hollat. A total of 47 species assigned to 25 genera of nannofossils were identified in 45 selected samples. The succession of the Elat Formation in the study area formed at NP16 to N17 or Middle Eocene. Stratigraphic reconstruction supported by biostratigraphy analysis shows that Section 3 at the lower (NP16 to NP 17), Section 2 in the middle part (NP 17), and Section 1 at the upper (NP 17). R-mode cluster analysis of nannofossils defined four species clusters (assemblies A, B, C and D) that tend to occur together. Q-mode cluster analysis defined five depth-distribution clusters (1, 2, 3, 4, and 5), each deposited under similar conditions. Based on large foraminifera, the succession was formed in fore reef setting in neritic bathymetric zone. Coarsening and thickening upward supported by the nannofossil assemblages indicate depositional dynamics which tend to be shallower. Reworked fossils, commonly found at the lower of the Elat Formation, show the mechanism of turbid currents in early deposition.

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