Research Output
Articles
Publication Date: 2025
Bulletin of Geosciences (12141119)100(2)pp. 187-211
The Persian Gulf is the remains of an ancient seaway that connected the Indo–Pacific Region to the Mediterranean– Atlantic Region and the Paratethys Ocean. The Mishan Formation in Zagros Basin, Qeshm Island (Persian Gulf), and the Miocene strata of Minab Province in the Makran Basin, southern Iran, have yielded a rich fauna of bryozoans. A total of 22 species are here identified from four sections of in the Qeshm and Minab areas, including 13 species belonging to the order Cyclostomata, and 9 species belonging to the order Cheilostomata. The distribution and occurrences of the bryozoan fauna show the studied intervals were deposited during Early to Middle Miocene while the Iranian Seaways was connected to the Indo–Pacific Region from southeast, and to Mediterranean–Atlantic Region from northwest. Also, the most similar occurrences of the species described are with bryozoan faunas of the Paratethys Ocean. • Key words: Bryozoa, Miocene, Iran, taxonomy. © 2025, Czech Geological Survey. All rights reserved.
Publication Date: 2025
Journal of Stratigraphy and Sedimentology Researches (20087888)41(3)pp. 17-40
Land subsidence represents a severe environmental hazard, causing significant infrastructure damage and threatening cultural heritage sites. The Isfahan–Borkhar region of central Iran, with its dry climate and diverse topographical conditions, has been highly susceptible to this phenomenon. Using remote sensing techniques, particularly radar interferometry (InSAR), this study investigates subsidence rates over the 2019–2023 period. Advanced machine learning methods, namely Decision Tree (DT), Random Forest (RF), and Extreme Gradient Boosting (XGBoost) are employed to develop a susceptibility map divided into five probability classes: very high, high, medium, low, and very low. The analysis incorporates 145 Sentinel-1 radar satellite images and factors such as elevation, groundwater levels, rock composition, vegetation cover and fault proximity. Among these, RF emerges as the most effective algorithm, achieving a classification accuracy of 95.63%, while XGBoost proved inefficient for certain critical subsidence zones. Results reveal that subsidence risk is concentrated in the central and eastern parts of the region due to excessive groundwater extraction and geological vulnerabilities. Conversely, the western and northwestern areas exhibit lower risk due to stable geological formations and controlled groundwater usage. These findings aim to inform regional planning and subsidence mitigation strategies. © 2025 University of Isfahan.
Publication Date: 2025
Boletin de la Sociedad Geologica Mexicana (14053322)77(1)
The present study investigates the pectinid bivalve record characterizing the Mio-Pliocene of Mishan and Aghjari formations in Qeshm Island of the Persian Gulf and Minab region of Makran Basin (Hormozgan Province). Thick-bedded deposits of highly accumulated levels of epifaunal free-lying pectinids were investigated in terms of paleoecology and taphonomy. Eight species of the family Pectinidae (Bivalvia) and nine species of Ostracoda are reported from the Direstan rural area, Qeshm Island, Persian Gulf, Southern Iran. Most bivalve shells display extreme taphonomic features such as breakage, bioerosion, encrustation, disarticulation, and abrasion. Encrusting Cheilostomata bryozoans, as well as polycheata worms, encrust pectinid valves; Langian (Middle Miocene) Cheilostomata are identified as Microporella berningi. The studied pectinids are represented by the following species: Pecten aff. rotundatus, Pecten cf. subarcuatus, Flabellipecten piramidesensis, Argopecten gratus, Chlamys varia, Chlamys multistriata, C. actinodes, and Talochlamys articulata. Ostracoda were also collected from two more outcrops in Qeshm Island (Kendaloo and Star Valley) and one outcrop of Minab region (Bemani section). The studied ostracods are: Alocopocythere kendengensis, Actinocythereis iraqensis, Loxoconcha hamrinensis, Neomonoceratina iniqua, Bairdoppilata triangulata, Bairdia rafidainensis, Hermanites transversicoststs, Costa tricostata, and Cytherelloidea hamrinensis. © (2025), (Boletin de la Sociedad Geologica Mexicana). All rights reserved.
Ridolfi, L.,
Bahrami, A.,
Yazdi, M.,
Schrøder, A.E.,
Marramà, G.,
Carnevale, G. Publication Date: 2025
Rivista Italiana di Paleontologia e Stratigrafia (20394942)131(3)pp. 603-629
Two new deep-sea hatchetfish species, †Argyropelecus iranicus n. sp. and †Argyropelecus zagrosensis n. sp., are described in detail herein based on fossil material from the Eocene (Bartonian) deposits of the Pabdeh Formation, Zagros Basin, Iran. A detailed investigation of the skeletal morphology of these new species was made possible through elemental distribution maps obtained using μ-XRF imaging technique of the fossil material. These new species are the oldest known representatives of the genus Argyropelecus. A phylogenetic analysis that includes all the extant species of the genus Argyropelecus suggests that †Argyropelecus iranicus n. sp. and †Argyropelecus zagrosensis n. sp. pertain to the ‘A. lychnus species complex’ and the ‘A. affinis species complex’, respectively. The morphospace analysis confirmed the presence of two distinct morphotypes within the genus Argyropelecus. Potential correlations between morphospace occupation and the ecological setting and lifestyle of this bizarre group of deep-sea fishes are also discussed. The presence of two species of the genus Argyropelecus in the Eocene Pabdeh Formation extends the temporal and biogeographical range of these deep-sea fishes, providing additional information for our understanding of the evolutionary and biogeographical history of the deep-sea hatchetfishes. Copyright (c) 2025 LORENZO RIDOLFI, ALI BAHRAMI, MEHDI YAZDI, ANE ELISE SCHRØDER, GIUSEPPE MARRAMÀ, GIORGIO CARNEVALE. This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Rajabi A.,
Mahmoodi P.,
Alfonso P.,
Canet C.,
Andrew C.,
Azhdari S.,
Rezaei S.,
Alaminia, Z.,
Tamarzadeh S.,
Yarmohammadi A.,
Khan Mohammadi G.,
Saeidi R.,
Sattari, E.,
Bahrami, A.,
Vaziri moghaddam, H.,
Taheri a., A. Publication Date: 2024
Minerals (2075163X)(7)pp. 1-25
Iran hosts more than 350 Precambrian to Cenozoic sediment-hosted Zn-Pb±Ba and barite-sulfide deposits, including shale-hosted massive sulfide (SHMS, also called SEDEX) and Irish-type and Mississippi Valley-type (MVT) mineralization, and barite is a common mineral in these deposits. In the SHMS deposits, barite is typically found as fine-grained disseminations in thin laminae. In these deposits, the sulfide laminae often occur as diagenetic replacements and as bands containing authigenic and diagenetic barite and pyrite framboids. In the Irish-type Zn-Pb-Ba and stratabound barite-sulfide deposits, barite exhibits various textures, including fine-grained disseminated barite, banded zebra textures, veins, and massive barite lenses. In some of the giant Irish-type deposits, as well as in the stratabound barite-sulfide mineralization, the main stratabound sulfide ore is developed within a barite envelope and is characterized by the replacement of barite and pyrite by chalcopyrite, galena, and sphalerite. In the MVT deposits, the formation of barite is often related to dolomitization, and sulfide mineralization involves the replacement of the dolomitized carbonate rocks, as well as associated barite. Fluid inclusion studies on the Irish-type deposits indicate that the temperatures and salinities of the sulfide-forming fluids are higher compared to those of the barite-forming fluids. Fluid inclusion analyses of coarse-grained barites from Irish and MVT deposits reveal their hydrothermal origin. The δ3⁴S values of sulfide minerals (pyrite, sphalerite, and galena) in Irish-type deposits exhibit a broad range of low values (mostly −28 to +5‰), primarily revealing a process of bacterial sulfate reduction (BSR). However, the textures (replacement, colloform, and banded) and more positive sulfur isotope values (+1 to +36‰) in the SHMS Zn-Pb deposits suggest that bacterial sulfate reduction (BSR) plays a less significant role. We suggest that thermochemical sulfate reduction (TSR) connected to the direct replacement of barite plays a more relevant role in providing sulfur for the sulfide mineralization in the SHMS, barite-sulfide, and MVT deposits. Based on the textual evidence, sulfur isotopic data, and fluid inclusion studies, barite has been identified as a key controller for the subsequent Zn-Pb mineralization by providing a suitable host and significant sulfur contribution in the sediment-hosted Zn-Pb and stratabound barite-sulfide deposits. This implies that diagenetic barite might be a precursor to all types of sediment-hosted Zn-Pb mineralization. © 2024 by the authors.
