Mohammadsadegh Dehghanian | Islamic Azad University Bandar Abbas Branch (original) (raw)

Papers by Mohammadsadegh Dehghanian

Geosciences Journal, Jul 10, 2024

Annales de paléontologie, Apr 1, 2024

Geological Journal, Oct 4, 2021

The alveolinids were once highly widespread in the Cenomanian of the Tethys Basin. Even though ev... more The alveolinids were once highly widespread in the Cenomanian of the Tethys Basin. Even though evolutionary studies have, thus far, been conducted using material from many countries e.g. Spain, Oman, and the UAE, the Zagros region in SW Iran has not been studied yet. Two sections of the Sarvak Formation in the Pyun and Kuh‐e‐Zana areas were investigated. Five type levels can be identified in the Pyun section. The evolutionary trend begins with praealveolinids followed by ovalveolinids in the Early Cenomanian. Cisalveolinids firstly appear in the Late Cenomanian strata and thenMultispirinais derived. ThenSimplalveolina simplexappears, which is derived fromMultispirina iranensis. At the Kuh‐e Zana section, the evolutionary trend was observed in three levels. There is no ideal evolutionary trend becauseMultispirinaandSimplalveolinaare absent in this section. The identified trends are similar to those of the Iberian Ranges in Spain.

Dear Author Please consider the minor revision below: 1. Please describe the Introduction in more... more Dear Author Please consider the minor revision below: 1. Please describe the Introduction in more detail. 2. The figures are not qualified. The author should convert the figure to high-resolution form. 3. Please describe the '' Geological Setting discussion and conclusion'' in more detail. Best wishes.

Carbonates and Evaporites

Iranian Journal of Earth Sciences, 2018

In the present research Kuh-e Siah Section in the Northeast of Shiraz in the Interior Fars, was i... more In the present research Kuh-e Siah Section in the Northeast of Shiraz in the Interior Fars, was investigated to study microfacies, sequence stratigraphy, facies analysis and sedimentary environment of Fahliyan Formation. Generally, 345 meters of these sediments were studied by investigating 240 thin sections. In this study, the indicator microfacies were accurately identified which include Mudstone, Wackestone, Packstone and Grainstone. Besides, skeletal and non-skeletal grains of these microfacies are Intraclast, Bioclast, Exteraclast and Peloid. According to lithostratigraphic study, underneath limit of Fahliyan Formation with the Surmeh Formation and its upper contact with Gadvan Formation were in the gradual form (SB2) and included (TST-LST-Early HST-Late HST) system tracts. In general, there were two second-degree sequences in this section., According to the analysis of the sedimentary environment, the The lowermost of the Fahliyan Formaion is comprised of the Inner shelf depos...

The Fahliyan Formation, which is part of the Khami Group is one of the important oil resources in... more The Fahliyan Formation, which is part of the Khami Group is one of the important oil resources in the lower cretaceous strata in the Zagros area. Index Foraminifera, continuity, and discontinuities have been used to identify the boundaries of this formation. To study biostratigraphy on Fahliyan Formation, the subsurface stratigraphic section of Aghar19 was selected in the southwest province of Iran. The thickness of this formation in this section is measured 215 m, including thin-to-medium-bedded limestone and dolomitic limestone. Fahliyan Formation continuously overlies Surmeh and Hith Formation and underlies Gadvan Formation. Vertical study of this formation has led to the identification of calcareous algae and foraminifera, which include 48 genera, 32 species, and three biozones in the sediments of the Fahliyan Formation. These biozones include: (1) Dukhania zone; (2) Pseudocyclammina lituus, Trocholina zone; and (3) Orbitolina, Choffatella, Salpingoporella Assemblage zone. Based...

Advances in Environmental Biology

Tarbur Formation is formed In Kuh-e-Dezdaran section that is situated in south of Chahar Mahal an... more Tarbur Formation is formed In Kuh-e-Dezdaran section that is situated in south of Chahar Mahal and Bakhtiyari Province with thickness of 115m and contains all of Calcareous and Dolomite sediments. The elemental analysis results and their plotted beside together shows that primary mineralogy of Tarbur Formation limestones contain in that section is aragonite and plotted amounts Mn about based on Sr/Ca indicated one close diagenetic environment with low water and rock ratio in this Formation. Geochemistry studies of Tarbur Formation Dolomites shows that, Mg,Fe and Mn values in dolomitic samples are more than calcic samples,whereas Ca,Na and Sr values in calcic samples are more than dolomitic samples that is related to Preferential Succession of Fe and Mn elements Instead of Mg in dolomite crystal network and Preferential Succession of Na and Sr elements Instead of Ca in aragonite crystal network.

Iranian Journal of Earth Sciences

In this research, totally 610.4 meters of the Asmari Formation are studied in two stratigraphic s... more In this research, totally 610.4 meters of the Asmari Formation are studied in two stratigraphic sections on Bavan Mountain and Sarvestan section in Fars province, Iran. The indexed microfacies are carefully determined through studying of 230 thin sections. This research shows that the indexed microfacies are mudstone, wackestone, packstone, prainstone and the amount of microfacies elements such as bioclasts, pellets, extraclasts and intraclasts. They are varied in different parts of the studied sections and the total amount of bioclasts in the section is more than other elements. The abundance of benthic bioclasts represents the regression of the basin from the open sea into the sub tidal and intertidal zone.

Carbonates and Evaporites, 2021

The Sarvak Formation is a thick carbonate sequence of Cenomanian age that has been deposited in a... more The Sarvak Formation is a thick carbonate sequence of Cenomanian age that has been deposited in a foreland basin across the Zagros Basin. Sarvak Formation is the main petroleum reservoir rock in the Zagros Basin. To study the foraminiferal paleoecology in the Sarvak Formation, the section was selected in the east of Shiraz (Khane Kat section) and 66 samples with a total thickness of 140 m were prepared. Then, these thin sections were studied precisely based on the lithostratigraphy, microfacies, geochemical stratigraphy (chemical XRF analysis), and paleoecology. Besides, the biozones were identified and geochemical changes of elements in each biozone were investigated. Totally, three biozones were identified in which the hyaline tests were abundant in biozone-1 and porcelaneous tests were accumulated in biozones-2 and -3. Based on the study of the foraminifera dispersion pattern, the age of the Sarvak Formation in Khane Kat section was determined as Cenomanian. The results indicated that the various environmental factors affected the test type, test size and the quantitative expansion of the test in the sedimentary basin. Geochemical, microfacies and paleoecology data indicated that the most appropriate and inappropriate condition of life was belonged to wackestone and mudstone facies, respectively. Increase in the ratio of benthic to pelagic (B/P ratios) throughout the section and the enhancement of microfossils with agglutinated tests represented the shallowness of the sedimentary basin and retrogradation of the sedimentary basin from the open marine to the Subtidal and intertidal.

Iran's mud volcanoes are clearly visible on the coastal plains of the Oman and Caspian Seas. ... more Iran's mud volcanoes are clearly visible on the coastal plains of the Oman and Caspian Seas. There are 30 Gatan Mud Volcanoes located in the southeast of Iran: 15 of which are located between Jask and Minab in Hormozgan province, nine are between Chabahar and Jask Ports, and another six are between Chabahar and the Iran-Pakistan border in Sistan and Balouchestan Province. After some studies and investigations, research was performed on some of the mud volcanoes in the western Jask city located in the west of lower Gatan village. Gatan is located in the eastern coast of Hormozgan Province between the counties of Jask and Minab and on the coastal region of Makran. Being located on the entrance of the Strait of Hormuz and due to marine currents, it has certain sedimentology circumstances. Formation of Gatan Mud Volcanoes is a result of rising muddy water along the faults and cracks in the crust to the earth's surface. Results of mineralogical studies indicate that clay and lime...

Asmari Formation is the thick sequence of carbonate sediment in the range of Oligocene-Miocene wh... more Asmari Formation is the thick sequence of carbonate sediment in the range of Oligocene-Miocene which is deposited in the foreland basins of the Zagros and is considered as the original and most famous reservoir rock of Zagros basin. To study of lithostratigraphic units and sequence stratigraphy of this Formation, the section in the southeast of Norabad was selected. Field study indicated that Asmari Formation possessed the thickness of 401.5m and included 9 lithostratigraphic units. According to the study of microfacies, Stacking pattern and identification of main sequence level, three depositional sequences including two-second order and one-third order sequence were recognized. The sea-level curve in the studied section indicated that it was correspondence to the global sea level curve. These facies deposited in five environmental sedimentations as follow Open Sea Shelf (Fore Barrier), Bar, Lagoon, Back bar shelf, and Shoal. The environment is part of a carbonate platform that has...

Acta Geologica Sinica - English Edition