Using larger benthic foraminifera for the paleogeographic reconstruction of Neo-Tethys during Paleogene

Ahmad, Sajjad; Jalal, Wahid; Ali, Fahad; Hanif, Muhammad; Ullah, Zaheen; Khan, Suleman; Ali, Asghar; Jan, Irfan U.; Rehman, Khaista

doi:10.1007/s12517-014-1549-x

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…This zone was recognized in the lower part of the section and attributed to the Early Eocene (Ypresian). It is equivalent to the foraminiferal association of Lower Eocene deposits in Sahlabad Province (Sistan Suture Zone; east Iran) (Babazadeh 2008(Babazadeh , 2010, Eocene beds of Kohat Potowar basin, and Punjab Salt Range in Pakistan as well (Akhtar and Butt 1999;Mirza et al 2005;Ahmad et al 2014). This zone can be correlated with SBZ 8 of Serra-Kiel et al (1998).…”

Section: Assemblage Zonesmentioning

confidence: 83%

New biostratigraphy and microfacies analysis of Eocene Jahrum Formation (Shahrekord region, High Zagros, West Iran). A carbonate platform within the Neo-Tethys oceanic realm

Changaei¹,

Babazadeh²,

Pirbaloti³

et al. 2023

BSGF - Earth Sci. Bull.

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The Eocene Jahrom Formation in High Zagros was studied in Kuh-e-Soukhteh and North Gahrou sections (southwest of Shahrekord region, Chaharmahal Bakhtiari Province). This formation, composed of limestone, marl, and dolomitic limestone (dolostone), accumulated on a marine platform within the Neo-Tethys ocean realm. It yields a rich foraminiferal fauna, in which three larger benthic foraminiferal assemblage zones were identified. Two assemblage zones in the North Gahrou section were correlated to the Ypresian and Bartonian, and one assemblage zone is represented in the Kuh-e-Soukhteh section and assigned to the Bartonian. A discontinuity marked by a hiatus from Cuisian to Lutetian in the North Gahrou section was most probably due to a concealed fault. According to microscopic textures and distribution of benthic foraminifera and other components (peloids, intraclasts, etc.), a gentle depth gradient from the inner ramp to the proximal outer ramp representing small scattered reliefs (shoal) may be reconstructed.

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Section: Assemblage Zonesmentioning

confidence: 83%

New biostratigraphy and microfacies analysis of Eocene Jahrum Formation (Shahrekord region, High Zagros, West Iran). A carbonate platform within the Neo-Tethys oceanic realm

Changaei¹,

Babazadeh²,

Pirbaloti³

et al. 2023

BSGF - Earth Sci. Bull.

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“…About 500 thin sections, including oriented sections, of the individual foraminiferal tests of nummulitids (Nummulites and Assilina) derived from the marl units were used in the biostratigraphic analysis. Based on the stratigraphic range of the identi ed foraminiferal species, a foraminiferal biozonation scheme has been developed and utilized (Ahmad et al, 2011(Ahmad et al, , 2014. The allochems, matrix, textural characteristics, fossil content, and diagenetic characteristics are described in detail in the microfacies analysis of more than 800 petrographic thin sections.…”

Section: Methodsmentioning

confidence: 99%

Tectonostratigraphic evolution of the Paleogene basins in North Pakistan: Implications for the timing of closure of Eastern Tethys and India-Asia Collision

Ahmad

2023

Preprint

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The current investigation's goal is to time the eventual closure of Pakistan's portion of the northern Tethys rim in Kohat-Potwar Basin by using integrated bio-sequence stratigraphy and facies information. The Paleogene strata is divided into six biozones while its depositional profile resembles a distally steepened-homoclinal platform. Paleogene deposits in the Kohat Basin include two depositional cycles, two transgressive-highstand systems tracts, one lowstand systems tract, and two sequence boundaries. Three transgressive-highstand systems tracts were observed in the Potwar Basin, which are separated by two tectonically controlled and one eustatic sequence boundary. The sequence boundaries in both basins are synchronous at 50–49.5 Ma and mark a period of drastic change in sediment character, which may have been caused by the combined effects of uplift and eustatic sea level fall. This suggests that the proto-closure of the northern rim of Tethys occurred between 50 and 49.5 Ma. Only the Kohat Basin experienced the restoration of marine conditions, which happened in the Middle Lutetian at around 45.8 Ma and may have been brought on by a combination of flexural loading of the Indian Plate and eustatic sea-level rise that persisted until the Kohat Basin's closure in the Upper Lutetian at around 41.2 Ma.

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“…The Iranian ranges long have been considered part of the Alpine-Himalayan System (Stöcklin, 1968(Stöcklin, , 1977Sengor et al, 1988;Babazadeh, 2003). This orogenic belt, which resulted from the closure of the Mesozoic Neo-Tethys, extends from western Europe (west Neo-Tethys) to Tibet passing through Turkey, Iran, Afghanistan (central Neo-Tethys), and possibly continues to Burma and Indonesia (east Neo-Tethys) (Sengor et al, 1988;Ahmad et al, 2014). Multiple continental blocks were amalgamated and are now separated by ophiolitic complexes (Stöcklin, 1977).…”

Section: Introductionmentioning

confidence: 99%

Biostratigraphy and paleoenvironmental significance of Paleogene foraminiferal assemblages from Dashte Zari area in High Zagros, West Iran

Babazadeh¹,

Cluzel²

2022

Rev. bras. paleontol.

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The Paleogene carbonate deposits of Pabdeh and Jahrum formations are widespread from the northwest (Dashte Zari area) to the southwest of the Shahrekord region in the High Zagros Mountains of Iran and record the lateral and upward transition from open marine into the shallow water environment. The Pabdeh Formation shows a succession of open marine pelagic and hemipelagic limestone, argillaceous limestone, and argillaceous chert. It consists of planktonic wackestone, pellet-planktonic wackestone, mudstone with planktonic foraminifera, and radiolarian siliceous wackestone, which accumulated within the Zagros Foreland Basin. The planktonic foraminifers are assigned to the Late Paleocene–Late Eocene and correspond to subtropical and tropical Zones P4b–E15. The Jahrum Formation is represented by bioclast-bearing limestone and calcarenite. It consists of benthic foraminiferal wackestone, benthic foraminiferal-red algal packstone, and bioclast-intraclast packstone deposited in a shallow platform environment. The Jahrum Formation is inter-fingered in the upper part of the Pabdeh Formation and finally overlies it conformably during the Bartonian–Priabonian. Shallowing and off-lap relationships record basin shrinking, while repeated inter-fingering signals moderate tectonic subsidence. Both formations are disconformably covered by the Late Oligocene–Miocene Asmari Formation. Keywords: biostratigraphy, Pabdeh Formation, Zagros, Paleogene, Iran.

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Using larger benthic foraminifera for the paleogeographic reconstruction of Neo-Tethys during Paleogene

Cited by 9 publications

References 18 publications

New biostratigraphy and microfacies analysis of Eocene Jahrum Formation (Shahrekord region, High Zagros, West Iran). A carbonate platform within the Neo-Tethys oceanic realm

New biostratigraphy and microfacies analysis of Eocene Jahrum Formation (Shahrekord region, High Zagros, West Iran). A carbonate platform within the Neo-Tethys oceanic realm

Tectonostratigraphic evolution of the Paleogene basins in North Pakistan: Implications for the timing of closure of Eastern Tethys and India-Asia Collision

Biostratigraphy and paleoenvironmental significance of Paleogene foraminiferal assemblages from Dashte Zari area in High Zagros, West Iran

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