Biotic components and biostratigraphy of the Qom Formation in northern Abadeh, Sanandaj–Sirjan fore-arc basin, Iran (northeastern margin of the Tethyan Seaway)

Mohammadi, Ebrahim; Ameri, Hamed

doi:10.1007/s12517-015-1948-7

Cited by 20 publications

(6 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Num mu lites and lepidocyclinid in dex spe cies are com mon in the Oligocene Qom For ma tion and its equiv a lent in the Zagros Ba sin, the Asmari For ma tion, and have been used for biozonation (Mohammadi and Ameri, 2015). In a few sec tions, Num mu lites spe cies have been found alone in Rupelian, or lower Rupelian, strata whereas lepidocyclinids alone have been found in Chattian strata or Aquitanian for ma tions (e.g., Bozorgnia and Kalantari, 1965;Kalantari, 1976;Amirshahkarami et al, 2007;Ehrenberg et al, 2007;Laursen et al, 2009;Amirshahkarami et al, 2010;Van Buchem et al, 2010;Yazdi-Moghadam, 2011;Mohammadi et al, 2013Karavan et al, 2014;Mohammadi and Ameri, 2015;Taheri et al, 2017;Basso et al, 2019;Akbar-Baskalayeh et al, 2020;Allahkarampour Dill et al, 2018;Mohammadi, 2022). In Iran, Biozone No.57, the Num mu lites intermedius-Num mu lites vascus as sem blage zone, was first pro posed as an in dex for the Oligocene by Wynd (1965), who de scribed the prop er ties and biostratigraphic fea tures of Oligocene-Mio cene strata in the Asmari For ma tion in the south-west of Iran.…”

Section: Regional Knowledge and Context Of Oligo-miocene Biozonesmentioning

confidence: 99%

Biostratigraphy, microfacies and reservoir quality of the Oligocene Qom Formation (Kharzan section, Northwest of Ardestan, Central Iran)

AFTABI ARANI,

ASHOURI,

DANESHIAN

et al. 2023

View full text Add to dashboard Cite

The cen tral Iran Ba sin is a re gion with unique en vi ron men tal char ac ter is tics in which the Late Paleogene-Early Neo gene ben thic foraminifera dis play dis tinc tive dis tri bu tions and abun dances that can as sist in iden ti fy ing the in ter vals with the best res er voir po ten tial. Lipidocyclinid and miogypsinid zonal marker taxa in this re gion can be cor re lated with those in the SBZ23 re gion (Eu ro pean Ba sin), in di cat ing an Oligocene (Chattian) age. With sed i men ta tion of con ti nen tal strata of the Up per Red For ma tion fol low ing the ma rine suc ces sion of the Qom For ma tion, it seems that the last Tethyan ma rine trans gres sion in the Ardestan re gion in cen tral Iran oc curred in the Oligocene, and the Tethyan sea way was per ma nently closed dur ing the Miocene. Seven car bon ate microfacies and marl or silty marl fa cies were iden ti fied in the study area based on field in ves ti gations, tex tural anal y sis and fau nal as sem blages. These microfacies were de pos ited on an open-shelf car bon ate plat form in la goonal, patch-reef, and open-ma rine belts that ef fec tively de fine both in ner and mid dle-shelf en vi ron ments. Micritization, ce men ta tion, me chan i cal and chem i cal com pac tion, dis so lu tion and frac tur ing are the most im por tant diagenetic pro cesses con trol ling res er voir qual ity in the Qom For ma tion. The in ves ti ga tion of these pro cesses in the fa cies of the Qom for ma tion in the Kharzan sec tion re vealed that in ter vals as so ci ated with shal low la goonal depositional en vi ron ments dis play better res ervoir qual ity than other for ma tion in ter vals, due to dis so lu tion and frac tur ing.

show abstract

Section: Regional Knowledge and Context Of Oligo-miocene Biozonesmentioning

confidence: 99%

Biostratigraphy, microfacies and reservoir quality of the Oligocene Qom Formation (Kharzan section, Northwest of Ardestan, Central Iran)

AFTABI ARANI,

ASHOURI,

DANESHIAN

et al. 2023

View full text Add to dashboard Cite

show abstract

“…These deposits consist of thick-bedded marls, medium to thick bedded fossiliferous limestone and various sized coral reef strata. The biostratigraphy of these deposits was studied by many researchers (Amirshahkarami and Nadimi, 2016;Hamad et al, 2015;Hassani, 2012;Hassani and Vaziri, 2011;Hassani et al, 2007;Hosseinipour, 2004;Hosseinipour and Hassani, 2015;Hosseinipour et al, 2010;Mohammadi, 2014;Mohammadi and Ameri, 2015;Mohammadi et al, 2012;Mohammadi et al, 2013), but the reefal strata did not receive enough attentions. These deposits were studied in Vartun section (Rahiminejad et al, 2016), Dizlu (Yazdi et al, 2012), Khavich (Hassani et al, 2006) and Abadeh (Schuster, 2002;Schuster and Wielandt, 1999) areas.…”

Section: Fatemeh Hosseinipourmentioning

confidence: 99%

The paleoecology and depositional model of the Oligo-Miocene coral reefs in the Mohammad Abad Area, the west of Baft, SW Kerman, Iran

Hosseinipour

2022

GeA

View full text Add to dashboard Cite

This paper deals with the Oligo-Miocene coral reefs in the Mohammadabad Area, W Baft, SW Kerman. The studied coral reefs include 11 families, 25 genera and 33 species of the scleractinian corals. The coral reef successions have deposited in three cycles on a mixed siliciclastic-carbonate platform. To understanding the paleoecology, reef architecture and depositional model of studied reefal successions, statistical analyses based on the coral niches, sedimentology analyses based on the grain size of the marly strata and microfacies analyses on limestone strata have used. Based on the statistical analyses, the coral community includes eight ecotypes. The distribution of these ecotypes indicates that, despite of various thicknesses, in all three coral reef successions, the branching and fast growth ecotypes are present at the basal parts and the massive, placoid and meandroid colonies are recorded in the slope, crest and distal parts of the reefs. The main disruptive phenomenon that stopped the reef development and affected the reef architecture has been the addition of clastic deposits to the carbonate system. This sediment load increase is recorded as marly strata. By The addition of clastic sediment load to the system, the carbonate content of the system has diluted, the salinity, water transparency and photic level is decreased, the favorable attachment hard substrate for coral polyps is limited, the nutrient and oxygen flux is disrupted and the coral reefs are suffocated.

show abstract

“…According to Mohammadi and Ameri (2015), the study of the Oligo-Miocene deposits of Central Iran (Qom Formation) and reconstruction of their depositional environments are essential and important because of: (1) their economic importance, since the Qom Formation is the main target for oil and gas exploration in Central Iran (Morley et al, 2009), and (2) at the same time, the Central Iran Sea had a communicative role between the Eastern Tethys (the proto-Indian Ocean) and the Western Tethys region (the proto-Mediterranean Sea).…”

Section: Introductionmentioning

confidence: 99%

Sedimentary environment and depositional sequences of the Qom Basin (north-eastern margin of the Tethyan seaway)

Binazadeh,

Safari,

Vaziri-Moghaddam

2024

ASGP

View full text Add to dashboard Cite

This research attempted to determine the depositional sequences of the Qom Formation in the Urumieh-Dokhtar arc (Ghamsar section) and Esfahan-Sirjan fore-arc (Abadeh section) sub-basins in Iran, using microfacies and microtaphofacies analyses. The authors also investigated connections between the Qom Basin and the Zagros and Paratethys basins during the Oligocene. In this regard a total of eight microfacies, two terrigenous facies, and five microtaphofacies were identified on the basis of 269 samples from the Ghamsar section and 93 samples from the Abadeh section. The studied microfacies, terrigenous facies, and microtaphofacies were deposited on a homoclinal carbonate ramp. This carbonate platform can be divided into inner, middle and outer ramp environments. On the basis of the distribution of microfacies and sequence stratigraphy studies, five third-order depositional sequences and one incomplete depositional sequence were identified in the Ghamsar section and three third-order depositional sequences in the Abadeh section. According to the distribution of microtaphofacies and palaeobathymetric studies based on Amphistegina, the energy, and depth of the Qom sea in the Ghamsar section were greater than those evidenced in the Abadeh section. The results of local fault activity in the different sub-basins of the studied sections indicate a lesser effect of global sea-level changes in the Paratethys basin. On the basis of the formation of depositional sequences in these sub-basins; and differences in the number of depositional sequences; intense local fault activity is indicated during the Chattian Age (especially in the Urumieh-Dokhtar arc sub-basin). Regional sea-level fluctuations of the south Tethyan Seaway and the Paratethys Basin controlled sea-level changes in the Chattian Age. The depositional basins of the Tethyan seaway (southern Tethyan seaway, Paratethys Basin and Qom Basin) probably were related during the Burdigalian to Langhian and the early Serravallian. The results show that, the effect of sea-level changes of the Zagros Sea on the formation of depositional sequences in the Esfahan-Sirjan fore-arc sub-basin was significant.

show abstract

Biotic components and biostratigraphy of the Qom Formation in northern Abadeh, Sanandaj–Sirjan fore-arc basin, Iran (northeastern margin of the Tethyan Seaway)

Abstract: Qom Formation (Oligo-Miocene marine deposits of Middle

Cited by 20 publications

References 33 publications

Biostratigraphy, microfacies and reservoir quality of the Oligocene Qom Formation (Kharzan section, Northwest of Ardestan, Central Iran)

Biostratigraphy, microfacies and reservoir quality of the Oligocene Qom Formation (Kharzan section, Northwest of Ardestan, Central Iran)

The paleoecology and depositional model of the Oligo-Miocene coral reefs in the Mohammad Abad Area, the west of Baft, SW Kerman, Iran

Sedimentary environment and depositional sequences of the Qom Basin (north-eastern margin of the Tethyan seaway)

Contact Info

Product

Resources

About