NOVALESIA PRODUCTA (MAGNIEZ, 1972), A LITTLE-KNOWN BENTHIC FORAMINIFER FROM THE APTIAN TAFT FORMATION OF CENTRAL IRAN

Acta Palaeontologica Romaniae, Journal Year: 2025, Volume and Issue: 21 (1), P. 81 - 88

Published: March 23, 2025

The larger benthic foraminifera Novalesia producta (Magniez) is a common constituent in the faunal assemblages of inner platform wackestone-packstone microfacies Aptian Taft Formation, Central Iran. abundant specimens observed thin-sections allow detailed morphological and biometrical analysis taxon that extends known data.

Language: Английский

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Intra-Turonian stratigraphic reorganisation on the Arabian Plate

Geological Society London Special Publications, Journal Year: 2024, Volume and Issue: 545(1)

Published: June 4, 2024

Shallow-marine carbonate deposition was widespread across the Arabian Plate during much of Late Permian–Mesozoic but significantly interrupted by a major tectonically driven stratigraphic reorganization that took place within Turonian. Published literature terms this ‘Wasia–Aruma Break’, ‘mid-Turonian Unconformity’, or ‘K150 Sequence Boundary (SB)’. It is widely understood event relates to subduction in closing Neotethys Ocean and obduction onto continental margin, especially southeastern part plate. As well as change facies, hiatus variable duration present, associated with erosion underlying stratigraphy. Despite being known for several decades, precision on its timing has been lacking due limitations biostratigraphic data because few other chronostratigraphic proxies have employed. In order rectify this, all relevant from synthesized evaluated context review calibration standard biozones multiple fossil groups. This shows youngest preserved rocks beneath K150 SB can be assigned middle Turonian Helvetoglobotruncana helvetica planktonic foraminifera zone Collignoniceras woollgari ammonite zone. The oldest above same biozones, supporting assertions it very short event. Whilst may initiated earlier (as supported recognition precursor events), crustal loading sufficient 91.5 Ma develop forebulge eastern plate uplift erosion. A relative sea-level carried out investigate eustatic signals time. sections around world, fall upper Zone European usage detected. appears coincide an episode climate cooling. However, despite there correspondence between significant event, seems mostly coincidental tectonic drivers at time Arabia were more dramatic. true Arabia. northwestern Arabia, quiescence allowed eustasy dominate. any case, would amplified effects tectonics entire region.

Language: Английский

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The Upper Jurassic Garedu Red Bed Formation of the northern Tabas Block: elucidating Late Cimmerian tectonics in east-Central Iran

International Journal of Earth Sciences, Journal Year: 2021, Volume and Issue: 110(3), P. 767 - 790

Published: Feb. 17, 2021

Abstract The Garedu Red Bed Formation (GRBF) of the northern Tabas Block (Central-East Iranian Microcontinent, CEIM) is a lithologically variable, up to 500-m-thick, predominantly continental unit. It rests gradually or unconformably on marine limestones Esfandiar Subgroup (Callovian–Oxfordian) and assigned Kimmeridgian–Tithonian. In lower part, it consists pebble- boulder-sized conglomerates/breccias composed limestone clasts intercalated with calcareous sandstones, litho-/bioclastic rudstones lacustrine carbonates. Up-section, sharp-based pebbly sandstones red silt-/fine-grained braided river origin predominate. Palaeocurrent data suggest principal sediment transport from west east lateral interfingering GRBF greenish marls Korond at eastern margin Block. Westwards, grades into playa deposits Magu Gypsum Formation. colours common calcretes arid semi-arid climatic conditions. onset deposition indicates major geodynamic change compressive tectonics Late Cimmerian Tectonic Event (LCTE), being strongest When traced southwards, same tectonic event expressed by extension, indicating shift in style along boundary fault between Lut blocks. complex Upper Jurassic facies distribution as well spatio-temporal changes regime block-bounding faults are explained counterclockwise vertical-axis rotation CEIM Kimmeridgian. block boundaries accommodated right-lateral strike slip, transpressional today’s transtensional southern segments faults. Rotation occurred within bracketing transcurrent continued Early Cretaceous, finally resulting opening narrow oceanic basins encircling CEIM. Palaeogeographically, part suite bed formations not only present CEIM, but also Sanandaj-Sirjan Zone (NW Iran), northeastern Iran beyond, inter-regional instability, uplift erosion under (semi-)arid conditions across Jurassic–Cretaceous boundary. Thus, even if our model successfully explains rotations, motions for basic cause LCTE still remains enigmatic.

Language: Английский

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The “Orbitolina Limestone” of central Iran: new data about microfacies, orbitolinid biostratigraphy, and palaeogeography

Facies, Journal Year: 2022, Volume and Issue: 68(3)

Published: May 11, 2022

Language: Английский

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Neorbitolinopsis conica (Matsumaru in Matsumaru and Furusawa, 2007) comb. nov., a Lower Cretaceous marker from the Orbitolina Limestone of Central Iran

Revue de Micropaléontologie, Journal Year: 2022, Volume and Issue: 75, P. 100680 - 100680

Published: April 19, 2022

Language: Английский

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Cenozoic Dextral Shearing Along the Arusan Sector of the Great Kavir–Doruneh Fault System (Central Iran)

Tectonics, Journal Year: 2021, Volume and Issue: 40(11)

Published: Oct. 17, 2021

Abstract The structural analysis of large intracontinental wrench faults is fundamental for deciphering the long‐term evolution continental crust in complex areas terms their geodynamic and large‐scale crustal block displacements. In this contribution, we demonstrate a pre‐Miocene dextral activity present‐day left‐lateral Great Kavir ‐ Doruneh Fault System (GKDFS, Central Iran), one major active strike‐slip extending from Afghan border to Nain region between Iran Sanandaj‐Sirjan Zone. We document important shearing recorded along segment GKDFS, Arusan (AFS), located east Jandaq, close trace GKDFS. AFS include several ENE‐WSW striking strands exposed length more than 50 km, which couple pre‐Cretaceous ophiolites metamorphic basement units with Cretaceous succession Khur basin. fault shows transpressional structures consistent shear including thrusts en échelon folds affecting carbonate units. Paleostress reconstruction based on mesoscopic related geometry allowed establish vorticity parameters indicating that deformation occurred total simple regime calculated Wk 0.9 1. enormous Meso‐Cenozoic displacements entire GKDFS are attested by up hundreds kilometers offset Paleotethys suture zone, NE western Iran.

Language: Английский

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Ichnology of the Cenomanian–Turonian boundary event in the southern Tethyan margin (Khanguet Grouz section, Ouled Nail Range, Algeria)

Arabian Journal of Geosciences, Journal Year: 2022, Volume and Issue: 15(12)

Published: June 1, 2022

Language: Английский

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Upper upper Albian ( Mortoniceras rostratum Zone) cephalopods from Clansayes (Drôme, south-eastern France)

Acta Geologica Polonica, Journal Year: 2022, Volume and Issue: unknown, P. 187 - 233

Published: June 8, 2022

We document an upper Albian ( Mortoniceras rostratum Zone) cephalopod assemblage from Clansayes (Drôme, south-eastern France). Although fossils are rare in local exposures and the single sampled level, a decade of intensive fossil collecting yielded 290 ammonite 5 nautilid specimens. In total, we describe 1 species 24 (within 17 genera) ammonites, including 13 heteromorphs. Only two these taxa were previously recorded at Clansayes, which demonstrates value this fauna with regard to taxonomy, palaeobiology palaeobiogeography. Based on morphological biometric analyses performed extensive material (104 specimens), discriminate for heteromorphic genus Mariella Nowak, 1916 within Zone. addition, investigate shell chirality patterns late southern France. Upon comparison older immediately underlying fallax Zone neighbouring Salazac locality, identify increase proportion sinistral This observed frequency specimens may hypothetically be part global evolutionary pattern, considering that nearly all documented younger Cenomanian (and more generally turrilitids) sinistral.

Language: Английский

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Stratigraphy, depositional environments and provenance of the Shemshak Group (Upper Triassic–lower Middle Jurassic) on the northern Tabas Block; evidence for the emergent Cimmerian ridge in Central Iran

Marine and Petroleum Geology, Journal Year: 2024, Volume and Issue: 167, P. 106980 - 106980

Published: June 28, 2024

Language: Английский

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Mode and timing of the Early Cretaceous transgression in Iran: Insights from the stratigraphic evidence of sea-level changes and geodynamic events

Journal of Asian Earth Sciences, Journal Year: 2023, Volume and Issue: 254, P. 105736 - 105736

Published: May 27, 2023

The study of selected logs from the Central-Eastern Iran Microplate (CEIM; area Arusan) and Sanandaj–Sirjan Zone (SSZ; areas Esfahan east Tiran) constrains timing evolution Cretaceous successions, resting unconformably on older sediments or non-conformably metamorphic basement. marine transgression occurred almost synchronously a levelled topography, documenting previous deep erosion. Above basal siliciclastic unit, rudist- orbitolinid-rich lower Aptian limestone ("Orbitolina Limestone", Shak Kuh Formation, Taft Formation) were deposited. Later, stratigraphic three studied differentiates, changes in depositional environments, reflecting different subsidence rates. In Tiran area, marls cherty limestones covering shallow-water record deepening trend. A differentiation environment is observed at Arusan, where conglomerates to west pass basinal sandstone east. Here, Coniacian-Campanian reprise carbonate production (with skeletal rich rudists, ostreids, abundant orbitoidids) covered by marls. north glauconitic hardground chert important during early Cenomanian, followed (middle Cenomanian). synchronous deposition successions large parts CEIM, SSZ North-Iranian domains suggests rapid regional controlled sea-level rise. Stratigraphic occurring late Aptian–Cenomanian times, recording onset tectonic events differently affecting aforementioned domains, likely related opening oceanic seaways CEIM SSZ.

Language: Английский

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